检索结果-南通市图书馆

Journal of Central South University 2015年第5期22卷 1614-1618页

作者： PARK Sunghoon KIM Soohyun PARK Suyoung LEE Sangmin LEE Chongmu Department of Materials Science and Engineering Inha University 253 Yonghyun-dong Nam-gu Incheon 402-751 Korea Department of Electronic Engineering Inha University 253 Yonghyun-dong Nam-gu Incheon 402-751 Korea

The sensing performances of multiple networked Ga N nanowire(NW) sensor codecorated with Au and Pt nanoparticles were examined. The pristine Ga N nanowires show responses of approximately 108%-173% to 0.05%-0.25% H2 at room temperature. On the other hand, the Ga N nanowires decorated with Au and those decorated with Pt lead to 1.1-1.3 and 1.2-1.6 times,respectively, stronger responses to 0.05%-0.25% H2. In contrast, the Au Pt-codecorated Ga N nanowires show 1.3-2.0 times stronger responses to 0.05%-0.25% H2. In other words, the Ga N nanorods codecorated with Au and Pt nanoparticles show much stronger response to H2 gas than the Au or Pt monometal-decorated counterpart. The underlying mechanism for the enhanced response of the Au Pt-codecorated Ga N nanowire was discussed.

关键词： Ga N nanowires metal catalyst bimetallic system gas sensor codecoration

Controllable synthesis of ultrathin vanadium oxide nanobelts via an EDTA-mediated hydrothermal process

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2016年第2期25卷 441-445页

作者：秦玉香刘成谢威威崔梦阳 School of Electronics and Information Engineering Tianjin University

Ultrathin VO_2 nanobelts with rough alignment features are prepared on the induction layer-coated substrates by an ethylenediaminetetraacetic acid（EDTA）-mediated hydrothermal process. EDTA acts as a chelating reagent and capping agent to facilitate the one-dimensional（1D） preferential growth of ultrathin VO_2 nanobelts with high crystallinities and good uniformities. The annealed induction layer and concentration of EDTA are found to play crucial roles in the formation of aligned and ultrathin nanobelts. Variation in EDTA concentration can change the VO_2 morphology of ultrathin nanobelts into that of thick nanoplates. Mild annealing of ultrathin VO_2 nanobelts at 350℃ in air results in the formation of V_2O_5 nanobelts with a nearly unchanged ultrathin structure. The nucleation and growth mechanism involved in the formations of nanobelts and nanoplates are proposed. The ethanol gas sensing properties of the V_2O_5 nanobelt networks-based sensor are investigated in a temperature range from 100℃ to 300℃ over ethanol concentrations ranging from 3 ppm to 500 *** results indicate that the V_2O_5 nanobelt network sensor exhibits high sensitivity, good reversibility, and fast responserecovery characteristics with an optimal working temperature of 250℃.

关键词： semiconductors nanobelt crystal growth gas sensor

Synthesis, Characterization and gas Sensing Properties of In(OH)_3 and In_2O_3 Nanorods through Carbon Spheres Template Method

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2012年第5期28卷 396-400页

作者： Xifeng Lu Lei Zhang Hui Zhao Kai Yan Yan Cao Lumin Meng Lunan Institute of Coal Chemical Engineering Jining 272000China College of Chemistry and Life Sciences Zhejiang Normal UniversityJinhua 321004China Jining Institute of Supervision and Inspection on Product Quality Jining 272000China

Poly-crystalline In（OH） 3 nanorods have been successfully prepared via a urea-based precipitation using the colloidal carbon spheres as the templates. After calcinations, the resulted In 2 O 3 nanorods with poly-crystalline structure were fabricated. Structure and morphology of the product were characterized by X-ray diffraction （XRD）, and transmission electron microscopy （TEM）. The possible formation process was schemed. The sensor gas properties towards C 2 H 5 OH and CO were examined.

关键词： Nanostructures Self-assembly Characterization gas sensor

Highly sensitive and selective ethanol sensors based on flower-like ZnO nanorods

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2011年第9期32卷 20-23页

作者：刘丽王连元韩郁李守春陕皓吴佩林孟鑫魏爱国李伟 State Key Laboratory of Superhard Materials College of PhysicsJilin University College of Instrumentation and Electrical Engineering Jilin University

A simple and easy hydrothermal process has been employed to synthesize flower-like ZnO products consisting of numerous orderly oriented and bundled *** structure and morphology of the novel ZnO structure are characterized in *** flower-like ZnO-nanorod-based gas sensors are investigated for their ethanoi-sensing properties,and the results reveal that the sensors exhibit a high response of 143.6 to 1000 ppm ethanol and good selectivity at the optimal operating temperature of 250℃.The effect of the flower-like morphology on the response of the gas sensors to ethanol is also investigated.

关键词： ZnO nanostructure ethanol gas sensor

Highly sensitive ZnO nanoparticles-loaded In2O3 hollow microsphere for detecting ppb-level NO2 at low working temperature

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2020年第4期30卷 469-476页

作者： Chao Zhang Dongjin Sun Yuchun Huan Kaidi Wu Hanlin Liao College of Mechanical Engineering Yangzhou University ICB UMR 6303 CNRS Univ.Bourgogne Franche-Comté

This paper presents a NO2sensor operating at low temperature, which was fabricated by ZnO nanoparticlesloaded In2O3hollow microspheres composites. SEM, XRD, XPS and HRTEM were executed to determine the morphology and microstructure of ZnO–In2O3. The sensing performance of pure In2O3and ZnO–In2O3composite sensors was tested. The NO2sensing properties of the composite were greatly improved in contrast with the pure In2O3sensor at the optimized operating temperature(75 °C). ZnO–In2O3composite sensor exhibited an obviously higher response(805.2 for 100 ppb NO2) than that of the pure In2O3sensor(14 for 100 ppb NO2). In particular, the response/recovery rate of ZnO–In2O3composite sensor was greatly improved in contrast with the pure In2O3sensor. The n-n heterojunctions created at ZnO–In2O3interfaces improved the sensing performance.

关键词： ZnO-In 2 O 3 Hollow microspheres gas sensor NO 2 sensor Low operating temperature

Hierarchical NiCo2O4 microspheres assembled by nanorods with p-type response for detection of triethylamine

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2020年第8期31卷 2077-2082页

作者： Chen Yang Yongshan Xu Lingli Zheng Yingqiang Zhao Wei Zheng Xianghong Liu Jun Zhang College of Physics Center for Marine Observation and CommunicationsQingdao UniversityQingdao 266071China College of Chemistry Chemical Engineering and Materials ScienceShandong Normal UniversityJi'nan 250014China

The morphological and structural design provides an efficient protocol to optimize the performance of gas sensing *** this work,a gas sensor with high sensitivity for triethylamine(TEA)detection is developed based on p-type NiCo2 O4 hierarchical *** NiCo2 O4 microspheres,synthesized by a hydrothermal route,have a three-dimensional(3 D)urchin-like structure assembled by nanorod building *** structure-property correlation has been investigated by powder X-ray diffraction,X-ray photoelectron spectroscopy,transmission electron microscope,scanning electron microscope,N2 adsorption-desorption tests and comprehensive gas sensing *** influence of calcination temperature on the morphological structure and sensing performances has been *** reveal that the material annealed at 300℃has a very large specific surface area of 125.27 m2/g,thereby demonstrating the best TEA sensing properties including high response and low limit of detection(145 ppb),good selectivity and *** further increase of the calcination temperature leads to the collapse of the 3 D hierarchical structure with significantly decreased surface area,which is found to decline the sensing *** work indicates the promise of ternary p-type metal oxide nanostructures for application in highly sensitive gas sensors.

关键词： Microstructures NiCo2O4 Metal oxide p-type response gas sensor

Core-shell TiO_(2)/ZnO nanorod array films on FTO:Two-step synthesis and improved ethanol sensing performance

在线全文

学校读者我要写书评

暂无评论

Journal of Materiomics 2023年第4期9卷 725-734页

作者： Xiangli An Bowen Zhang Chongyang Wang Zhiyong Zhao Saisai Zhang Hari Bala Zhanying Zhang School of Materials Science and Engineering Henan Polytechnic UniversityJiaozuo454000China Cultivating Base for Key Laboratory of Environment-friendly Inorganic Materials in University of Henan Province Henan Polytechnic UniversityJiaozuo454000China

In this work,highly regular TiO_(2)nanorod array films were synthesized in situ on FTO by a facile hydrothermal method,and then ZnO shell layers were grown on the surface of the nanorods to form a coreshell structure via an ion-layer adsorption-reaction *** to the TiO_(2)nanorods,the prepared TiO_(2)/ZnO nanocomposites exhibited enhanced ethanol sensing performances,including a low working temperature,higher sensitivity,and faster response *** optimum sensor based on 2c-TiO_(2)/ZnO exhibited the maximum response value of 30.85 toward 50×10^(-6)C_(2)H_(5)OH at 340℃,which was almost 4.15 times higher than that of the TiO_(2)*** improved ethanol sensing mechanism was discussed in relation to the unique nanorod array structure and the heterojunctions between TiO_(2)and ZnO.

关键词： Core-shell structure TiO_(2)/ZnO Nanorod arrays Heterojunction gas sensor

Large-area nanopatterned graphene for ultrasensitive gas sensing

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2014年第5期7卷 743-754页

作者： Alberto Cagliani David Micheal Angus Mackenzie Lisa Katharina Tschammer Filippo Pizzocchero Kristoffer Almdal Peter Boggild DTU Nanotech-Center for Nanostructured Graphene (CNG) and Department of Micro- and Nanotechnology Technical University ofDenmark Building 345 ~rsteds Plads 2800 Kgs. Lyngby Denmark

Chemical vapor deposited （CVD） graphene is nanopatterned using a spherical block copolymer etch mask. The use of spherical rather than cylindrical block copolymers allows homogeneous patterning of cm-scale areas without any substrate surface treatment. Raman spectroscopy was used to study the con- trolled generation of point defects in the graphene lattice with increasing etching time, confirming that alongside the nanomesh patterning, the nanopatterned CVD graphene presents a high defect density between the mesh holes. The nanopatterned samples showed sensitivities for NO2 of more than one order of magnitude higher than for non-patterned graphene. NO2 concentrations as low as 300 ppt were detected with an ultimate detection limit of tens of ppt. This is the smallest value reported so far for non-UV illuminated graphene chemiresistive NO2 gas sensors. The dramatic improvement in the gas sensitivity is believed to be due to the high adsorption site density, thanks to the combination of edge sites and point defect sites. This work opens the possibility of large area fabrication of nanopatterned graphene with extremely high densities of adsorption sites for sensing applications.

关键词： graphene gas sensor nitrogen dioxide nanopatteming defects

High Sensitive Ambipolar Response towards Oxidizing NO2 and Reducing NH3 Based on Bis（phthalocyaninato） Europium Semiconductors

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2016年第10期34卷 975-982页

作者： Xia Kong Zhen Dong Yanling Wu Xiyou Li Yanli Chen Jianzhuang Jiang School of Science China University of Petroleum (East China) Qingdao Shandong 266580 China Beymg Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials Department of Chemistry University of Science and Technology Beijing Beijing 100083 China

High sensitive chemical sensors towards NO2 and NH3 based on the self-assembled nanostructures of the heteroleptic and homoleptic bis（phthalocyaninato） europium complexes with octanaphthoxy phthalocyaninato ligands named Eu（Pc）[Pc（ONh）8] （1） and Eu[Pc（ONh）8]2 （2） [Pc = unsubstituted phthalocyaninate; Pc（ONh）8 = 2,3,9,10,16,17,23,24-octanaphthoxy phthalocyaninate] have been developed. The good conductivity, high crystal- linity and large specific surface area for the self-assemblies of 1 render it excellent sensing property for either electron-accepting gas NO2 in 50--250 ppb range or electron-donating gas NH3 in 2.5--12.5 ppm range due to the optimized molecular packing in the uniform-sized nanopartieles depending on the effective intermolecular interaction between double-decker molecules, among the best results of phthalocyanine-based chemical sensors for detection of NO2 and NH3 at room temperature. Interestingly, self-assemblies of I exhibited n-type response to NO2 and p-type response to NH3, which is the first example of ambipolar charge-transporting gas sensors fabricated from single- component organic semiconductors. However, the self-assemblies of 2 with sixteen bulky naphtboxy groups at the periphery of two Pc rings only present an n-type response to strong oxidant gas NO2 in a relatively high concentration of 0.5 - 1.5 ppm, while are insensitive to weak reducing gas NH3 due to the existence of great steric hindrance from bulky naphthoxy groups and more traps and/or defects in self-assemblies.

关键词： phthalocyanine double-decker gas sensor self-assemblies ambipolar semiconductor

A DFT study of the CO adsorption and oxidation at ZnO surfaces and its implication for CO detection

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2020年第6期31卷 1674-1679页

作者： Zibin Ni Shenyuan Bao Xue-Qing Gong Key Laboratory for Advanced Materials Centre for Computational Chemistry and Research Institute of Industrial CatalysisSchool of Chemistry&Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China

Recently,ZnO-based gas sensors have been successfully fabricated and widely studied for their excellent sensitivity and selectivity,especially in CO ***,detailed explorations of their mechanisms are rather ***,aiming at clarifying the sensing mechanism,we carried out density functional theory(DFT)calculations to track down the CO adsorption and oxidation on the ZnO(1010)and(1120)*** calculated results show that the lattice O of ZnO(1010)is more reactive than that of ZnO(1120)for CO *** the calculated energetics and structures,the main reaction product on both surfaces can be determined to be CO2 rather than ***,the surface conductivity changes during the adsorption and reaction processes of CO were also *** both ZnO(1010)and(1120),the conductivity would increase upon CO adsorption and decrease following CO oxidation,in consistence with the reported experimental *** work can help understand the origins of ZnO-based sensors’performances and the development of novel gas sensors with higher sensitivity and selectivity.

关键词： Density functional theory ZnO gas sensor CO oxidation Surface conductivity