期刊文献+
共找到735篇文章
< 1 2 37 >
每页显示 20 50 100
Rapid screening detection of fluoroquinolone residues in milk based on turn-on fluorescence of terbium coordination polymer nanosheets
1
作者 Xin Xu Lixia Feng +4 位作者 Jie Li Ping Yuan Jiangao Feng Lijun Wei Xianglei Cheng 《中国化学快报:英文版》 SCIE CAS CSCD 2019年第3期549-552,共4页
We report a facile, effective and rapid screening method for the determination of total fluoroquinolones(FQs) in milk using lanthanide coordination polymer nanomaterials as the sensing platform. The nonluminescent coo... We report a facile, effective and rapid screening method for the determination of total fluoroquinolones(FQs) in milk using lanthanide coordination polymer nanomaterials as the sensing platform. The nonluminescent coordination polymer nanosheets(CPNSs) used in this work are composed of adenosine monophosphate(AMP) and terbium(Tb3+) ions(AMP/Tb CPNSs). The as-prepared CPNSs were characterized by transmission electron microscopy, Fourier transform infrared spectroscopy and fluorescence techniques. Tb3+ acts as the center ion of the coordination polymer, with AMP assembled through phosphate and amine groups. However, the reaction between FQs and AMP/Tb CPNSs noticeably turns on the fluorescence due to the strong coordination interaction between FQs and Tb3+. Under optimized conditions, the fluorescence intensity of AMP/Tb at 545 nm shows a linear relationship with FQ concentrations between 0.04 μmol/L and 5.0 μmol/L. The relative standard deviation(RSD) of the intraday precision is below 1%, and detection limits are as low as 0.01 μmol/L. The proposed method was successfully applied to the determination of FQs in milk samples. 展开更多
关键词 Fluoroqui no lones TERBIUM coordination polymer NANOSHEETS FLUORESCENCE Screening DETECTION
Hydrothermal Synthesis of Zn2SnO4/Few-Layer Boron Nitride Nanosheets Hybrids as a Visible-Light-Driven Photocatalyst
2
作者 王一瑾 吴湘锋 +8 位作者 ZHAO Zehua LI Hui ZHANG Chenxu SUJunzhang ZHANG Jiarui CAO Zuolin WANG Yiwei WANG Kaiyuan PAN Juncheng 《武汉理工大学学报:材料科学英文版》 SCIE EI CAS 2019年第3期563-567,共5页
Zn2SnO4/few-layer boron nitride nanosheets (FBNNS) hybrids were synthesized via a one-step hydrothermal method. The structures, morphology, optical properties, electron transformation and separation of the as-prepared... Zn2SnO4/few-layer boron nitride nanosheets (FBNNS) hybrids were synthesized via a one-step hydrothermal method. The structures, morphology, optical properties, electron transformation and separation of the as-prepared products were characterized by X-ray diffraction, transmission electrical microscopy, UV-vis diffuse reflectance spectroscopy and electrochemical impedance spectroscopy, respectively. Rhodamine B was used to evaluate the photocatalytic activities of the as-prepared samples under visible light illumination. The photocatalytic mechanism was also explored. Experimental results showed that the degradation efficiency of rhodamine B was firstly increased and then decreased with increasing the usage amount of FBNNS. When it was 9 wt% based on the weight of Zn2SnO4, the degradation efficiency of the as-prepared Zn2SnO4/FBNNS-9 wt% composites reached to the maximum of 97.5 % in 180 min, which was higher than 39.2 % of pure Zn2SnO4. Moreover, the holes played mainly active roles in photocatalytic reaction process. In addition, the as-prepared hybrids could enhance the separation efficiency of photoexcited carriers compared to pure Zn2SnO4. 展开更多
关键词 zinc STANNATE boron NITRIDE NANOSHEETS PHOTOCATALYSIS
一种光驱动下具有敏化性能的氯氧化铋/超薄聚苯胺核壳纳米片结构
3
作者 唐永华 周鹏 +5 位作者 王凯 林斐 赖建平 晁玉广 李红星 郭少军 《中国科学:材料科学(英文版)》 CSCD 2019年第1期95-102,共8页
光催化技术在可再生能源和环境保护方面有巨大的潜力.本文通过一步氧化聚合法合成了一种超薄聚苯胺壳敏化氯氧化铋核纳米片结构.该结构中约1-2纳米厚的超薄聚苯胺壳可以促进催化剂对可见光的响应,氯氧化铋核可以促进聚苯胺中光生载流子... 光催化技术在可再生能源和环境保护方面有巨大的潜力.本文通过一步氧化聚合法合成了一种超薄聚苯胺壳敏化氯氧化铋核纳米片结构.该结构中约1-2纳米厚的超薄聚苯胺壳可以促进催化剂对可见光的响应,氯氧化铋核可以促进聚苯胺中光生载流子的分离,在可见光驱动下对于降解罗丹明B具有较高的光催化活性和稳定性.优化后的氯氧化铋/超薄聚苯胺核壳催化剂的光催化降解罗丹明B的活性比纯氯氧化铋高出近三倍,且稳定性更高.本工作为设计可见光驱动的高效混合光催化剂提供了一种新的策略. 展开更多
关键词 氯氧化铋 聚苯胺 纳米片 光驱动 超薄 结构 核壳 敏化
Two-dimensional metal-organic-framework as a unique theranostic nano-platform for nuclear imaging and chemo-photodynamic cancer therapy
4
作者 Wenjun Zhu Yu Yang +5 位作者 Qiutong Jin Yu Chao Longlong Tian Jingjing Liu Ziliang Dong Zhuang Liu 《纳米研究:英文版》 SCIE EI CAS CSCD 2019年第6期1307-1312,共6页
Nanoscale metal organic frameworks (NMOFs) with porous structure and inherent biodegradability are attractive nanomedicine platforms.In addition to conventional particulate NMOFs,two-dimensional (2D) NMOFs are emergin... Nanoscale metal organic frameworks (NMOFs) with porous structure and inherent biodegradability are attractive nanomedicine platforms.In addition to conventional particulate NMOFs,two-dimensional (2D) NMOFs are emerging as a unique type of NMOFs which however have been relatively less explored for nanomedicine applications.Herein,2D NMOFs composed of Zn2+ and tetrakis(4-carboxyphenyl) porphyrin (TCPP) are fabricated and functionalized with polyethylene glycol (PEG).Compared to their particulate counterpart,such 2D NMOFs show greatly increased drug loading capacity and enhanced light-triggered singlet oxygen production,promising for chemotherapy and photodynamic therapy (PDT),respectively.Utilizing the porphyrin structure of TCPP,our 2D NMOFs could be labeled with a diagnostic radioisotope,99mTc,for single photon emission computer tomography (SPECT) imaging,which reveals efficient tumor homing of those 2D NMOFs upon intravenous injection.While offering a remarkable synergistic in vivo antitumor effect for the combined chemo-PDT,such 2D NMOFs show efficient biodegradation and rapid renal clearance.Our work presents the great promise of 2D NMOFs for nanomedicine applications. 展开更多
关键词 nanoscale metal-organic-framework TWO-DIMENSIONAL NANOSHEETS drug delivery photodynamic THERAPY combination THERAPY
纳米薄片PtSnNa/MFI催化剂的制备及其丙烷脱氢性能研究 预览
5
作者 姜健准 冯静 +2 位作者 刘晓玲 刘红梅 张明森 《石油化工》 CAS CSCD 北大核心 2019年第4期327-334,共8页
采用水热合成法和浸渍法制备了不同硅铝比的纳米薄片负载型 PtSnNa/MFI 系列分子筛催化剂,并考察了纳米薄片催化剂的丙烷脱氢性能。采用 XRD、SEM、TEM、27Al MAS NMR、N2吸附-脱附、FTIR等方法对催化剂的形貌、孔结构及物性参数等进行... 采用水热合成法和浸渍法制备了不同硅铝比的纳米薄片负载型 PtSnNa/MFI 系列分子筛催化剂,并考察了纳米薄片催化剂的丙烷脱氢性能。采用 XRD、SEM、TEM、27Al MAS NMR、N2吸附-脱附、FTIR等方法对催化剂的形貌、孔结构及物性参数等进行了表征。表征结果显示,催化剂具有纳米薄片交叉构成的球形形貌和介孔结构,纳米薄片的厚度为 20 ~ 40nm,催化剂中的 Pt 分散于纳米薄片分子筛表面。实验结果表明,硅铝比为 100 和 500 的 MFI 分子筛制备的 PtSnNa/MFI-100和 PtSnNa/MFI-500 催化剂在丙烷脱氢反应中都表现出较好的催化性能,在反应温度为 600 ℃、丙烷的重时空速为 3 h^-1、常压的条件下反应 40 h 时,丙烷转化率约为 40%,丙烯选择性约为 94%。 展开更多
关键词 纳米薄片 MFI 分子筛 丙烷脱氢 丙烯
在线阅读 下载PDF
Highly sensitive ethanol gas sensor based on ultrathin nanosheets assembled Bi2WO6 with composite phase
6
作者 Tongwei Yuan Zhijun Li +6 位作者 Wenshuang Zhang Zhenggang Xue Xiaoqian Wang Zhiheng Ma Yu Fan Jiaqiang Xu Yuen Wu 《科学通报:英文版》 SCIE EI CSCD 2019年第9期595-602,共8页
Bismuth tungstate(Bi2 WO6) has many intriguing properties and has been the focus of studies in a variety of fields, especially photocatalysis. However, its application in gas-sensing has been seldom reported.Here, we ... Bismuth tungstate(Bi2 WO6) has many intriguing properties and has been the focus of studies in a variety of fields, especially photocatalysis. However, its application in gas-sensing has been seldom reported.Here, we successfully synthesized assembled hierarchical Bi2 WO6 which consists of ultrathin nanosheets with crystalline-amorphous composite phase by a one-step hydrothermal method. X-ray diffraction(XRD), X-ray photoemission spectroscopy(XPS), field-emission scanning electron microscopy(FESEM),and high-resolution transmission electron microscopy(HRTEM) techniques were employed to characterize its composition, morphology, and microstructure. By taking advantage of its unique microstructure,phase composition, and large surface area, we show that the resulting Bi2 WO6 is capable of detecting ethanol gas with quick response(7 s) and recovery dynamic(14 s), extremely high sensitivity(Ra/Rg= 60.8@50 ppm ethanol) and selectivity. Additionally, it has excellent reproducibility and long-term stability(more than 50 d). The Bi2 WO6 outperform the existing Bi2 WO6-based and most of the other state-of-the-art sensing platforms. We not only provided one new member to the field of gas sensor,but also offered several strategies to reconstruct nanomaterials. 展开更多
关键词 Bi2WO6 NANOSHEETS ASSEMBLED structure COMPOSITE PHASE Gas sensor ETHANOL detection
Two-dimensional Sn2Ta2O7 nanosheets as efficient visible lightdriven photocatalysts for hydrogen evolution
7
作者 Xiao-Shuai Wang Chao Zhou +2 位作者 Run Shi Qin-Qin Liu Tie-Rui Zhang 《稀有金属:英文版》 SCIE EI CAS CSCD 2019年第5期397-403,共7页
Two-dimensional Sn2Ta2O7 nanosheets with a thickness of~10 nm were successfully prepared through a novel tantalic acid-based solid-state reaction method at reduced temperature.The as-obtained samples were characterize... Two-dimensional Sn2Ta2O7 nanosheets with a thickness of~10 nm were successfully prepared through a novel tantalic acid-based solid-state reaction method at reduced temperature.The as-obtained samples were characterized by powder X-ray diffraction(XRD),ultraviolet–visible(UV–Vis)diffuse reflectance spectra,scanning electron microscopy(SEM),transmission electron microscopy(TEM)and Brunauer–Emmett–Teller(BET)analysis.The photocatalytic performance of Sn2 Ta2 O7 nanosheets was evaluated by photocatalytic water splitting for hydrogen evolution under visible light irradiation(k C 400 nm).The Sn2Ta2O7 nanosheets with a large surface area of 25.9 m^2·g^-1 showed higher H2 production activity,which was about 4.4 times higher than that of bulk Sn2 Ta2O7 in lactic acid aqueous solutions using Pt as a cocatalyst.The improved photocatalytic performance mainly benefited from the nanosheet structure,which provided abundant surface active sites and facilitated the photogenerated charge carrier separation efficiently.This workmay open up new opportunity to develop novel nanostructured tantalum-based semiconductors with improved catalytic performance for solar energy conversion. 展开更多
关键词 Sn2Ta2O7 NANOSHEETS VISIBLE light PHOTOCATALYSIS HYDROGEN evolution
Lotus-stalk Bi4Ge3O12 as binder-free anode for lithium and sodium ion batteries
8
作者 Jianlong Xu Wei Wei +2 位作者 Xu Zhang Lei Liang Maotian Xu 《中国化学快报:英文版》 SCIE CAS CSCD 2019年第6期1341-1345,共5页
Alloyed-type anode materials with high-energy density for lithium and sodium ion batteries attracted much attention of the researchers. However, substantial volume expansion of these materials in the devices during re... Alloyed-type anode materials with high-energy density for lithium and sodium ion batteries attracted much attention of the researchers. However, substantial volume expansion of these materials in the devices during repeated electrochemical process leads to fast capacity fading and hinders their further practical application. Nanotechnology could act as a useful tool to effectively address the issue. Herein, lotus-stalk Bi4Ge3O12 nanosheets vertically grown on the nickel foam (denoted as Bi4Ge3O12 NSs@NF) were prepared via a straight-forward solvothermal method. Benefiting from their three dimensional (3D) conductive framework and two dimensional (2D) lotus-stalk Bi4Ge3O12 nanosheet structure, as anode materials of lithium-ion batteries (LIBs) and sodium-ion batteries (NIBs), the electrochemical performances of Bi4Ge3O12 NSs@NF were greatly enhanced as a result of mitigating the huge volume variations during cycles. The Bi4Ge3O12 NSs@NF electrodes delivered a high reversible capacity of 1033.1 mAh/g for the first cycle and exhibited 68.6%capacity retention of after 88 cycles at 0.10 A/g in the voltage window of 0.01~3.0 V versus Li/Li+. In the test of NIBs, the lotus-stalk Bi4Ge3O12 composite electrodes still stored Na+as high as 332.3 mAh/g at 0.10 A/g over 100 sodiation/desodiation repeating cycles. 展开更多
关键词 Bi4Ge3O12 NANOSHEETS LITHIUM-ION battery Sodium-ion BATTER ANODE
利用镧系离子掺杂延长{001}/{101}晶面共暴露的TiO2纳米片电荷分离态以增强其光催化产氢性能 预览
9
作者 朱永安 张振翼 +2 位作者 吕娜 华瑞年 董斌 《催化学报》 SCIE EI CAS CSCD 北大核心 2019年第3期413-423,共11页
随着工业化的快速发展,化石燃料等不可再生能源的快速消耗,人类将面临不可预测的能源危机.寻找有效的方法来解决能源短缺问题已成为当今的重要研究课题.氢能是一种可以替代化石燃料的清洁可再生能源.利用半导体光催化分解水制氢技术可... 随着工业化的快速发展,化石燃料等不可再生能源的快速消耗,人类将面临不可预测的能源危机.寻找有效的方法来解决能源短缺问题已成为当今的重要研究课题.氢能是一种可以替代化石燃料的清洁可再生能源.利用半导体光催化分解水制氢技术可以将太阳能转化为氢能.目前,在已开发的半导体光催化材料中,TiO2因具有无毒、稳定、廉价等优点而备受光催化领域关注.但是,在实际应用方面,TiO2的光催化效率受限于其低的光子利用率和较高的光生电子-空穴复合率.许多研究表明,TiO2不同晶面的协同作用有利于光生载流子的迁移分离,并且适量的掺杂能够捕获光生电子,从而抑制其复合.而镧系元素因其特殊4f电子结构受到广泛的关注.采用物理或化学方法将镧系离子引入TiO2晶格中,可以影响光生电子和空穴的动力学过程,延长光生载流子的分离状态,从而提高光催化活性.本文通过简单溶剂热法成功合成了镧系离子掺杂{001}/{101}面共暴露的TiO2纳米片.X-射线粉末衍射(XRD)、X-射线光电子能谱(XPS)和高分辨透射电子显微镜(HRTEM)的表征结果证明了镧系离子选择性掺杂在TiO2纳米片{101}面上.结合紫外可见吸收光谱、稳态荧光、瞬态荧光衰减曲线、光电流及莫特-肖特基曲线等手段对镧系离子掺杂TiO2光催化剂进行了表征,结果表明,镧系离子掺杂TiO2纳米片增强了对光的吸收,同时延长光生载流子的分离状态,阻碍光生电子和空穴的复合.考察其光催化分解水制氢的性能.研究表明,在相同掺杂量(0.5mol%RE3+=Ho3+,Er3+,Tm3+,Yb3+,Lu3+)的TiO2纳米片中,Yb3+-TiO2纳米片光催化剂具有优异的产氢活性,在模拟太阳光照射1h后产氢量是纯TiO2的4.25倍.同时讨论了不同浓度助催化剂Pt作用下的Yb3+-TiO2纳米片产氢效果,当Pt含量量为0.3wt%时,光解水产氢活性最佳,Pt/Yb3+-TiO2纳米片的产氢量是Yb3+-TiO2的2倍,纯TiO 展开更多
关键词 光催化 产氢 镧系离子掺杂 TIO2 共暴露面 {001}面 纳米片
在线阅读 下载PDF
SiO2修饰强化BiOCl纳米片对有机污染物的光催化降解性能 预览
10
作者 余长林 何洪波 +2 位作者 刘兴强 曾巨澜 刘珍 《催化学报》 SCIE EI CAS CSCD 北大核心 2019年第8期1212-1221,共10页
许多有机污染即使在很低浓度下也可对水生生物造成各种不利影响.例如,作为合成环氧树脂和聚碳酸酯重要原料的双酚A是一种典型的内分泌干扰化学物质,当大量的双酚A被排放到水环境中时,必将对水生生态环境造成不可修复的破环.光催化技术... 许多有机污染即使在很低浓度下也可对水生生物造成各种不利影响.例如,作为合成环氧树脂和聚碳酸酯重要原料的双酚A是一种典型的内分泌干扰化学物质,当大量的双酚A被排放到水环境中时,必将对水生生态环境造成不可修复的破环.光催化技术具有催化效率高、矿化能力强和环境友好等优点,是很有应用前景的有机污染物降解方法.但是,目前大多数光催化剂尚难以满足实际有机废水处理或其它环境净化的需求.限制光催化剂大规模应用的原因可归结于以下两方面:一是光催化反应中的量子效率较低,大部分光生电子和空穴被复合而消耗掉,这使得电子和空穴很难迁移到催化剂表面及与吸附的目标降解物发生氧化反应;二是太阳光利用效率较低,在光催化剂体系中,宽带隙的半导体占有很大比重,而宽带隙的光催化剂需要短波长的紫外光来激发电子跃迁,这极大限制了自然太阳光或人工可见光的使用.BiOCl是一种绿色、稳定的新型光催化剂,具有材料易得、制备方法简单和形貌可控等诸多优点.为了进一步提高BiOCl光催化剂对有机污染物的降解活性,本文从提高量子效率的角度出发,采用SiO2纳米粒子修饰BiOCl纳米片光催化剂,以期提高光生电子和空穴分离效率,进而增强BiOCl纳米片对有机污染物的光催化降解活性.我们首先采用水解法制备了SiO2纳米粒子,然后通过水热反应制备了SiO2纳米粒子修饰的BiOCl复合光催化剂.利用XRD, FT-IR, SEM/TEM,BET, UV-vis DRS, XPS和光电流等表征手段分析了样品的物理化学性质.催化活性测试表明, SiO2/BiOCl在苯酚、双酚A和罗丹明B等有机污染物的光催化降解中表现出优越的光催化活性和稳定性.与单纯的BiOCl相比, 1.88%SiO2/BiOCl样品对罗丹明B、双酚A和苯酚的降解率分别提高了16.5%, 29.0%和38.7%.SiO2纳米粒子修饰使催化性能提升的主要原因如下:首先, 展开更多
关键词 SiO2/BiOCl 纳米片 有机污染物 光催化 界面
在线阅读 下载PDF
Ag2CrO4单晶纳米片的制备及其光催化性能 预览
11
作者 杨德权 韩濛 +2 位作者 王鑫 刘秉鑫 段君元 《济南大学学报:自然科学版》 CAS 北大核心 2019年第4期333-338,共6页
以硝酸银(AgNO3)和铬酸钾(K2CrO4)为原料,聚乙烯吡咯烷酮(PVP)为形貌控制剂,通过简单的一步液相法制备铬酸银(Ag2CrO4)单晶纳米片,采用X射线粉末衍射(XRD)、场发射扫描电镜(SEM)和透射电镜(TEM)对产物的成分、结构和形貌进行详细表征;考... 以硝酸银(AgNO3)和铬酸钾(K2CrO4)为原料,聚乙烯吡咯烷酮(PVP)为形貌控制剂,通过简单的一步液相法制备铬酸银(Ag2CrO4)单晶纳米片,采用X射线粉末衍射(XRD)、场发射扫描电镜(SEM)和透射电镜(TEM)对产物的成分、结构和形貌进行详细表征;考察PVP对Ag2CrO4纳米结构的影响,提出Ag2CrO4单晶纳米片的形成机理;通过第一性原理和紫外-可见分光光度计对其能带结构和吸光特性进行研究,测试其光催化降解有机染料(罗丹明B、甲基橙)的活性,并与无规则的Ag2CrO4亚微颗粒样品进行比较。结果表明:合成产物为沿[200]方向生长的Ag2CrO4长六方形单晶纳米片,属四方晶系,长度、宽度和厚度分别约为400、200、30nm;理论计算结果显示其为一类直接带隙半导体,带隙约为1.404eV,紫外吸收光谱显示其实验带隙值约为1.82eV;Ag2CrO4单晶纳米片具有良好的可见光催化活性。 展开更多
关键词 纳米片 铬酸银 光催化 可见光
在线阅读 下载PDF
Inverse opal manganese dioxide constructed by few-layered ultrathin nanosheets as high-performance cathodes for aqueous zinc-ion batteries
12
作者 Hao Ren Jin Zhao +3 位作者 Lan Yang Qinghua Liang Srinivasan Madhavi Qingyu Yan 《纳米研究:英文版》 SCIE EI CAS CSCD 2019年第6期1347-1353,共7页
Considering the high safety,low-cost and high capacity,aqueous zinc ion batteries have been a potential candidate for energy storage ensuring smooth electricity supply.Herein,we have synthesized inverse opal manganese... Considering the high safety,low-cost and high capacity,aqueous zinc ion batteries have been a potential candidate for energy storage ensuring smooth electricity supply.Herein,we have synthesized inverse opal manganese dioxide constructed by few-layered ultrathin nanosheets by a solution template method at mild temperature.The ultrathin nanosheets with the thickness as small as 1 nm are well separated without obvious aggregation.Used as cathode material for aqueous zinc ion batteries,the few-layered ultrathin nanosheets combined with the inverse opal structure guarantee excellent performance.A high specific discharge capacity of 262.9 mAh·g^-1 is retained for the 100th cycle at a current density of 300 mA·g^-1 with a high capacity retention of 95.6%.A high specific discharge capacity of 121 mAh·g^-1 at a high current density of 2,000 mA·g^-1 is achieved even after 5,000 long-term cycles.The ex-situ X-ray diffraction (XRD) patterns,selected-area electron diffraction (SAED) patterns and high-resolution transmission electron microscopy (HRTEM) results demonstrate that the discharge/charge processes involve the reversible formation of zinc sulfate hydroxide hydrate on the cathode while in-plane crystal structure of the layered bimessite MnO2 could be maintained.This unique structured MnO2 is a promising candidate as cathode material for high capacity,high rate capability and long-term aqueous zinc-ion batteries. 展开更多
关键词 inverse OPAL ULTRATHIN few-layered NANOSHEETS MnO2 zinc ion batteries
Ultrathin 2D Conjugated Polymer Nanosheets for Solar Fuel Generation
13
作者 Xin-Lei Zhang Lei Wang +2 位作者 Liang Chen Xiao-Yu Ma Hang-Xun Xu 《高分子科学:英文版》 SCIE CAS CSCD 2019年第2期101-114,共14页
Two-dimensional(2D)polymers are fascinating as they exhibit unique physical,chemical,mechanical,and electronic properties that are completely different from those of traditional linear or branched polymers.They are ve... Two-dimensional(2D)polymers are fascinating as they exhibit unique physical,chemical,mechanical,and electronic properties that are completely different from those of traditional linear or branched polymers.They are very promising for applications in catalysis,separation,optoelectronics,energy storage,and nanomedicine.Recently,ultrathin 2D conjugated polymers have emerged as advanced materials for converting solar energy into chemical energy.The inherent 2D planar structure with in-plane periodicity offers many features that are highly desirable for photon-involved catalytic energy conversion processes,including high absorption coefficients,large surface areas,abundant surface active sites,and efficient charge separation.Moreover,the possibility of finely tuning the optoelectronic and structural properties through precise molecular engineering has opened up new opportunities for design and synthesis of novel 2D polymer nanosheets with unprecedented applications.Herein,we highlight recent advances in developing ultrathin 2D conjugated polymer nanosheets for solar-to-chemical energy conversion.Specifically,we discuss emerging applications of ultrathin 2D conjugated polymer nanosheets for solar-driven water splitting and CO2 reduction.Meanwhile,future challenges and prospects for design and synthesis of ultrathin 2D conjugated polymer nanosheets for solar fuel generation are also included. 展开更多
关键词 2D POLYMERS CONJUGATED POLYMERS NANOSHEETS PHOTOCATALYSIS Energy CONVERSION
以开孔的二维MFI纳米片为构筑单元制备沸石片膜 预览
14
作者 吴云琴 郑璐康 +5 位作者 陈琦 俞梦婷 王金桂 张富民 肖强 朱伟东 《无机化学学报》 SCIE CAS CSCD 北大核心 2019年第1期89-94,共6页
以食人鱼溶液(体积比为3∶1的95%~98%(w/w)H2SO4和30%(w/w)H2O2混合液)处理多层MFI(ML?鄄MFI)除去有机结构导向剂(OSDA),经超声剥离和沉降纯化后得到了开孔的MFI沸石纳米片。采用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、N2吸附... 以食人鱼溶液(体积比为3∶1的95%~98%(w/w)H2SO4和30%(w/w)H2O2混合液)处理多层MFI(ML?鄄MFI)除去有机结构导向剂(OSDA),经超声剥离和沉降纯化后得到了开孔的MFI沸石纳米片。采用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、N2吸附-脱附、傅立叶变换红外光谱(FT?鄄IR)和热重分析(TGA)等手段对得到的MFI沸石纳米片进行表征,发现食人鱼溶液处理可移除ML?鄄MFI中的OSDA,再经超声剥离得到可分散、开孔的MFI沸石纳米片。将MFI沸石纳米片用简单抽滤的方式沉积到自制Al2O3载体上,不经二次生长得到了连续的沸石纳米片膜。单组分气体渗透性能测试结果表明,制备的MFI沸石纳米片膜对正/异丁烷的理想选择性为4.1~5.8,正丁烷的渗透速率为2.2×10^-7~4.1×10^-7 mol·m^-2·s^-1·Pa^-1。 展开更多
关键词 沸石 纳米结构 纳米片 食人鱼溶液 异构体分离
在线阅读 下载PDF
二硫化钼纳米薄片分散液的剥离制备 预览
15
作者 刘陈仁浪 李培真 +1 位作者 陈龙 安琪 《电子科技》 2019年第4期64-67,共4页
文中采用液相超声剥离粉末二硫化钼制备了纳米薄片分散液,通过紫外可见吸收光谱测定分散液的浓度,并探索了超声功率、超声时间以及二硫化钼初始浓度对纳米薄片分散液浓度的影响。实验结果表明,当超声功率为350W,超声时间为48h,二硫化钼... 文中采用液相超声剥离粉末二硫化钼制备了纳米薄片分散液,通过紫外可见吸收光谱测定分散液的浓度,并探索了超声功率、超声时间以及二硫化钼初始浓度对纳米薄片分散液浓度的影响。实验结果表明,当超声功率为350W,超声时间为48h,二硫化钼初始浓度为10mg/mL时,所制备的纳米薄片分散液浓度可达0.16mg/mL。在剥离过程中加入聚乙烯吡咯烷酮,可以有效避免由于纳米薄片自身团聚而导致的分散液稳定性差的问题,所得到的二硫化钼纳米薄片分散液可稳定存放超过两个月;同时,PVP的加入可将二硫化钼纳米薄片分散液浓度提高至0.42mg/mL。 展开更多
关键词 液相超声剥离 二硫化钼 纳米薄片 团聚 聚乙烯吡咯烷酮 稳定性
在线阅读 免费下载
Microwave assisted hydrothermal synthesis of tin niobates nanosheets with high cycle stability as lithium-ion battery anodes
16
作者 Xingang Kong Jiarui Zhang +4 位作者 Jianfeng Huang Jiayin Li Yi Qin Ting Zhao Qi Feng 《中国化学快报:英文版》 SCIE CAS CSCD 2019年第3期771-774,共4页
In this study, SnNb2O6 and Sn2Nb2O7 nanosheets are synthetized via microwave assisted hydrothermal method, and innovatively employed as anode materials for lithium-ion battery. The SnNb2O6 electrode exhibits high reve... In this study, SnNb2O6 and Sn2Nb2O7 nanosheets are synthetized via microwave assisted hydrothermal method, and innovatively employed as anode materials for lithium-ion battery. The SnNb2O6 electrode exhibits high reversible capacity and excellent cycling stability(498 mAh/g at 0.1 A/g after 100 cycles),which is superior to that of Sn2Nb2O7 electrode(173 mAh/g at 0.1 A/g after 100 cycles). Even increasing the current density to 2.0 A/g, the SnNb2O6 electrode still delivers a reversible capacity up to 306 mAh/g.The rate performance of the SnNb2O6 electrode is also better than that of Sn2 Nb2O7 electrode at different current densities from 0.1 A/g to 2.0 A/g. The enhanced electrochemical performance of SnNb2O6 nanosheets can be attributed to the unique layered structure, which is conducive to the diffusion of the lithium ions and the migration of electrons during discharge/charge. 展开更多
关键词 TIN NIOBATES NANOSHEETS Microwave assisted HYDROTHERMAL ANODE materials Lithium ion batteries Layered structure
Hollow cobalt oxide nanoparticles embedded in nitrogen-doped carbon nanosheets as an efficient bifunctional catalyst for Zn–air battery 预览
17
作者 Yuhui Tian Li Xu +6 位作者 Jian Bao Junchao Qian Huaneng Su Huaming Li Haidong Gu Cheng Yan Henan Li 《能源化学:英文版》 SCIE EI CAS CSCD 2019年第6期59-66,共8页
Rational design of low-cost, highly electrocatalytic activity, and stable bifunctional electrocatalysts for oxygen reduction reaction(ORR) and oxygen evolution reaction(OER) has been a great significant for metal–air... Rational design of low-cost, highly electrocatalytic activity, and stable bifunctional electrocatalysts for oxygen reduction reaction(ORR) and oxygen evolution reaction(OER) has been a great significant for metal–air batteries. Herein, an efficient bifunctional electrocatalyst based on hollow cobalt oxide nanoparticles embedded in nitrogen-doped carbon nanosheets(Co/N-Pg) is fabricated for Zn–air batteries. A lowcost biomass peach gum, consisting of carbon, oxygen, and hydrogen without other heteroatoms, was used as carbon source to form carbon matrix hosting hollow cobalt oxide nanoparticles. Meanwhile, the melamine was applied as nitrogen source and template precursor, which can convert to carbon-based template graphitic carbon nitride by polycondensation process. Owing to the unique structure and synergistic effect between hollow cobalt oxide nanoparticles and Co-N-C species, the proposal Co/N-Pg catalyst displays not only prominent bifunctional electrocatalytic activities for ORR and OER, but also excellent durability. Remarkably, the assembled Zn–air battery with Co/N-Pg air electrode exhibited a low discharge-charge voltage gap(0.81 V at 50 mA cm^-2) and high peak power density(119 mW cm^-2) with long-term cycling stability. This work presents an effective approach for engineering transition metal oxides and nitrogen modified carbon nanosheets to boost the performance of bifunctional electrocatalysts for Zn–air battery. 展开更多
关键词 Zn-air batteries OXYGEN reduction REACTION OXYGEN evolution REACTION NITROGEN-DOPED carbon NANOSHEETS Cobalt oxides
在线阅读 下载PDF
Orientation-controlled,low-temperature plasma growth and applications of h-BN nanosheets
18
作者 Ivan Sergeevich Merenkov Mikhail Sergeevich Myshenkov +11 位作者 Yuri Mikhailovich Zhukov Yohei Sato Tatyana Sergeevna Frolova Denis Vasilevich Danilov Igor Alekseevich Kasatkin Oleg Sergeevich Medvedev Roman Vladimirovich Pushkarev Olga Iva no vna Sin itsyna Masami Terauchi Irina Alekseev na Zvereva Marina Leonidovna Kosinova Ken Ostrikov 《纳米研究:英文版》 SCIE EI CAS CSCD 2019年第1期91-99,共9页
Dimensionality and orientation of hexagonal boron nitride(h-BN)nanosheets are promising to create and control their unique properties for diverse applications.However,low-temperature deposition of vertically oriented ... Dimensionality and orientation of hexagonal boron nitride(h-BN)nanosheets are promising to create and control their unique properties for diverse applications.However,low-temperature deposition of vertically oriented h-BN nanosheets is a significant challenge.Here we report on the low-temperature plasma synthesis of maze-like h-BN nanowalls(BNNWs)from a mixture of triethylamine borane(TEAB)and ammonia at temperatures as low as 400℃.The maze-like BNNWs contained vertically aligned stacks of h-BN nanosheets.Wavy h-BN nanowalls with randomly oriented nanocrystalline structure are also fabricated.Simple and effective control of morphological type of BNNWs by the deposition-mperature is demonstrated.Despite the lower synthesis temperature,thermal stability and oxidation resistivity of the maze-like BNNWs are higher than for the wavy nanowalls.The structure and oxidation of the nanowalls was found to be the critical factor for their thermal stability and con trolled luminescence properties.Cytotoxic study dem on strated sign ificant antibacterial effect of both maze-like and wavy h-BN nanowalls against E.coli.The reported results reveal a significant potential of h-BN nanowalls for a broad range of applications from electronics to biomedicine. 展开更多
关键词 BORON NITRIDE NANOSHEETS nanowalls chemical vapor deposition CYTOTOXICITY light emission thermal stability
钛酸H1.07Ti1.73O4·H2O纳米片的制备及结构表征 预览
19
作者 张珍 陈双双 +7 位作者 朱琳 荆飞 苗磊 姚明刚 李立杰 顾洪溪 韩银凤 胡登卫 《宝鸡文理学院学报:自然科学版》 CAS 2019年第1期46-52,62共8页
目的系统研究正丙胺和四甲基氢氧化铵剥离剂、剥离温度及时间对层状钛酸H1.07Ti1.73O4·H2O(HTO)单晶剥离效果的影响,揭示HTO纳米片的形成机制,为新型二维纳米材料的开发提供新思路。方法以熔盐法制备得到层状钛酸盐K0.8Ti1.73Li0.2... 目的系统研究正丙胺和四甲基氢氧化铵剥离剂、剥离温度及时间对层状钛酸H1.07Ti1.73O4·H2O(HTO)单晶剥离效果的影响,揭示HTO纳米片的形成机制,为新型二维纳米材料的开发提供新思路。方法以熔盐法制备得到层状钛酸盐K0.8Ti1.73Li0.27O4(KTLO)晶体,经离子交换处理制备得到层状钛酸HTO晶体,通过正丙胺和四甲基氢氧化铵溶液对其剥离得到HTO纳米片。结果当剥离温度为50℃时,分别以40%(ω)的正丙胺对HTO剥离48h和10%的四甲基氢氧化铵对HTO剥离24h后得到的样品剥离效果最佳;正丙胺剥离得到的样品结晶性高、剥离效果更好。结论通过对剥离剂的质量分数(ω)、剥离反应的温度和时间的调控,可制备得到具有良好结晶性及形貌的HTO纳米片。 展开更多
关键词 H1.07Ti1.73O4·H2O 纳米片 剥离反应 离子交换
在线阅读 下载PDF
Superior adsorption performance of graphitic carbon nitride nanosheets for both cationic and anionic heavy metals from wastewater
20
作者 Gang Xiao Yaoqiang Wang +5 位作者 Shengnan Xu Peifeng Li Chen Yang Yu Jin Qiufeng Sun Haijia Su 《中国化学工程学报:英文版》 SCIE EI CAS CSCD 2019年第2期305-313,共9页
Water pollution caused by highly toxic Cd(II), Pb(II), and Cr(VI) is a serious problem. In the present work,a green and low-cost adsorbent of g-C3N4 nanosheets was developed with superior capacity for both cationic an... Water pollution caused by highly toxic Cd(II), Pb(II), and Cr(VI) is a serious problem. In the present work,a green and low-cost adsorbent of g-C3N4 nanosheets was developed with superior capacity for both cationic and anionic heavy metals. The adsorbent was easily fabricated through one-step calcination of guanidine hydrochloride with thickness less than 1.6 nm and specific surface area of 111.2 m2·g^-1. Kinetic and isotherm studies suggest that the adsorption is an endothermic chemisorption process, occurring on the energetically heterogeneous surface based on a hybrid mechanism of multilayer and monolayer adsorption. The tri-s-triazine units and surface N-containing groups of g-C3N4 nanosheets are proposed to be responsible for the adsorption process.Further study on pH demonstrates that electrostatic interaction plays an important role. The maximum adsorption capacity of Cd(II), Pb(II), and Cr(VI) on g-C3N4 nanosheets is 123.205 mg·g^-1, 136.571 mg·g^-1,and 684.451 mg·g^-1, respectively. The better adsorption performance of the adsorbent than that of the recently reported nanomaterials and low-cost adsorbents proves its great application potential in the removal of heavy metal contaminants from wastewater. The present paper developed a promising adsorbent which will certainly find applications in wastewater treatment and also provides guiding significance in designing adsorption processes. 展开更多
关键词 g-C3N4 NANOSHEETS NANOMATERIALS Adsorption Heavy metals WASTEWATER
上一页 1 2 37 下一页 到第
使用帮助 返回顶部 意见反馈