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在材料的合成与制备、组成与结构、性能及使用效能四者之间存在着强烈的相互依赖关系[1 ] 。一种材料的性质与其组成及结构息息相关 ,而组成与结构又是合成和制备的结果。合成与制备是提高材料质量的关键 ,也是开发新材料、新器件的中心环节。鉴于此 ,本文在前面工作[2~ 4] 的基础上 ,应用正交试验方法[5] ,探讨pH值、温度、搅拌速度三共沉淀反应条件对Sn Zn Fe复合氧化物气敏性能的影响。1 实验部分1 1 敏感材料的制备按表 1设计的正交试验方案 ,取物质的量相同的Sn、Zn、Fe氯化物混合液 ,在不同温度、搅拌速度条件下 ,… 相似文献
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基于半导体纳米SnO_2构建的气敏传感器的应用研究进展 总被引:1,自引:0,他引:1
SnO2是传统的气敏材料,由于其具有间隙锡离子和氧空位的特性,使得气体更容易吸附在材料表面,从而显示出更好的气敏性质.通过把SnO2进行贵金属附载掺杂和多种气敏性半导体氧化物的复合,探讨了一系列性能良好的气敏传感器,阐述了SnO2气敏传感的最新进展. 相似文献
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金属氧化物半导体气体传感器是目前研究和应用最为广泛的气体传感器之一,具有高灵敏、长寿命和低成本等优点。然而,金属氧化物半导体气敏材料在湿润环境中会与水蒸气发生相互作用,导致传感器的基线电阻发生漂移,气敏性能受到显著影响,成为传感器应用中面临的瓶颈问题。针对该问题,研究者们从抑制水的表面吸附、水与氧的竞争吸附及调控水与吸附氧的反应三个方面开发了一些金属氧化物半导体气敏材料的抗湿性能提升策略,从而提升金属氧化物半导体气敏材料的抗湿性。本文对水蒸气的影响机理进行了分析,对三类抗湿提升策略的未来发展提出展望,有望为金属氧化物半导体气敏材料抗湿性能的提升提供解决思路与方法指导。 相似文献
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稀土掺杂γ—Fe2O3气敏材料研究 总被引:7,自引:0,他引:7
采用化学共沉淀法合成了具有良好气敏特性的γ—Fe_2O_3微粉。通过稀土掺杂使γ—Fe_2O_3的显微结构得到改善,相转变温度得到提高,进而改善了γ-Fe_2O_3气敏材料的稳定性,提高了气体检测灵敏度。另外,不同稀土元素的掺杂使γ—Fe_2O_3气敏材料的气敏选择性得到改善。 相似文献
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几种尖晶石型氧化物纳米粉体的制备及气敏性 总被引:2,自引:0,他引:2
采用化学共沉淀法合成了4种尖晶石型复合氧化物MFe2O4(M=Cu^2+,Zn^2+,Cd^2+,Mg^2+),X射线粉末衍射分析,透射电镜及比表面测定等表征结果表明它们均具较大比表面积的纳米粉体,平均粒径〈50nm,将样品做成厚膜型气敏元件,测定了其对乙炔,液化石油气,一氧化碳、氢气和乙醇等还原(可燃)性气体的气敏特性。 相似文献
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《International journal of quantum chemistry》2018,118(15)
Gas sensing study of C2H4Li complex toward oxides viz. CO, CO2, NO, NO2, SO, and SO2 gas molecules has been carried out using ab initio method. Different possible configurations of gas molecule adsorption on C2H4Li complex are considered. The structural parameters of most stable configuration of gas molecule adsorbed complexes are thoroughly analysed. Electronic properties are studied using total density of states (DOS) plot. Charge transferred between the gas molecule and the substrate is studied using NBO charge analysis. Gas sensing of all the six gas molecules is possible at ambient conditions. Atom centred density matrix propagation (ADMP) molecular dynamics simulations confirmed that all the gas molecules remain adsorbed on C2H4Li complex at room temperature during the simulation. This study suggests that the C2H4Li complex acts as a novel gas sensing material for CO, CO2, NO, NO2, SO, and SO2 gas molecules at ambient conditions, below room temperature as well as at high pressure. 相似文献
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钙钛矿型复合氧化物光催化研究进展 总被引:9,自引:0,他引:9
扼要叙述了钙钛矿型复合氧化物(ABO3)作为光催化剂的研究进展。包括结构,机理,制备,改性和研究现状。强调了结构与性能之间的关系并对其研究方向提出了自己的见解。 相似文献
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Xinran Zhou Xiaowei Cheng Yongheng Zhu Ahmed A. Elzatahry Abdulaziz Alghamdi Yonghui Deng Dongyuan Zhao 《中国化学快报》2018,29(3):405-416
This review gives a comprehensive summary about the porous metal oxides with focus on the synthesis methods, structure related properties, as well as the modification strategies for gas sensing improved performances. 相似文献
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荧光传感材料作为有机半导体光电功能材料的重要组成之一,以其灵敏度高、选择性强、响应速度快等优势,成为当前化学传感领域的一个研究热点,近年来在反恐、禁毒等领域有着广泛的应用.然而目前,对荧光敏感材料各项性能参数的设计与优化,依然存在着经验性问题,需要基于构效结合思维,从待测物质的分子层次的物性认知出发,更有针对性地设计相应的传感材料.本文基于国内外前沿工作,结合本课题组多年在危险化学品荧光传感方向的经验,以爆炸物、神经毒剂和合成毒品的检测为例,对荧光敏感材料的设计原则和传感的分子级微观作用机制进行了系统论述. 相似文献
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V. L. Vokov G. S. Zakharova L. V. Strukova T. Edkhazi O. V. Pozdnyakova 《Russian Chemical Bulletin》1996,45(2):324-327
Catalytic properties of -Al2O3 -supported complex vanadium and chromium oxides V2–x
Cr
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O5– (0 < × s 1.3), amorphous to X-rays, in the reduction of nitrogen oxides with ammonia were studied. Vanadium exists in these catalysts mostly in a pentavalent state and chromium exists as Cr3+ and Cr6+. As the content of chromium in the catalysts increases, the optimal temperature of the process decreases, and the degree of conversion of nitrogen oxides increases.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 339–342, February, 1996. 相似文献
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《中国化学快报》2020,31(5):1119-1123
Mesoporous semiconducting metal oxides(SMOs) heterojunctions are appealing sensors for gas detecting.However,due to the different hydrolysis and condensation mechanism of every metal precursor and the contradiction between high crystallinity and high surface area,the synthesis of mesoporous SMOs heterojunctions with highly o rdered mesostructures,highly crystallized frameworks,and high surface area remains a huge challenge.In this work,we develop a novel "acid-base pair"adjusted solvent evaporation induced self-assembly(EISA) strategy to prepare highly crystallized ordered mesoporous TiO_2/WO_3(OM-TiO_2/WO_3) heterojunctions.The WCl_6 and titanium isopropoxide(TIPO) are used as the precursors,respectively,which function as the "acid-base pair",enabling the coassembly with the structure directing agent(PEO-b-PS) into highly ordered meso structures.In addition,PEO-b-PS can be converted to rigid carbon which can protect the meso structures from collapse during the crystallization process.The resultant OM-TiO_2/WO_3 heterojunctions possess primitive cubic mesostructures,large pore size(~21.1 nm),highly crystalline frameworks and surface area(~98 m~2/g).As a sensor for acetone,the obtained OM-TiO_2/WO_3 show excellent re sponse/recovery perfo rmance(3 s/5 s),good linear dependence,repeatability,selectivity,and long-term stability(35 days). 相似文献
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Yu Wen Facai Wei Wenqian Zhang Anyang Cui Jing Cui Chengbin Jing Zhigao Hu Qingguo He Jianwei Fu Shaohua Liu Jiangong Cheng 《中国化学快报》2020,31(2):521-524
Two-dimensional mesoporous materials combing ultrathin nanosheet morphology with well-defined mesoporous structures,are now emerging and becoming increasingly important for their promising applications in energy storage,electronic devices,electrocatalysts and so on.Here,we synthesized a kind of polypyrrole-based two-dimensional mesoporous materials with uniform pore size,ultrathin thickness and high surface area.Serving for electrochemical NH3 sensor,they exhibited a fast response and high sensitivity.Therefore,our study would promote much interest in design of new materials for gas sensor applications. 相似文献
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After preparing the precursor by a liquid precipitation method, a series of tin-zinc composite oxides with different components
and structures were synthesized as the anode materials for lithium ion batteries when the precursor was pyrolyzed at different
temperatures. The products were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and electrochemical
measurements. The reversible capacity of amorphous ZnSnO3 is 844 mA · h/g in the first cycle and the charge capacity is 695 mA · h/g in the tenth cycle. The reversible capacity of
ZnO · SnO2 is 845 mA · h/g in the first cycle and the charge capacity is 508 mA · h/g in the tenth cycle. The reversible capacity of
SnO2 · Zn2SnO4 is 758 mA · h/g in the first cycle and the charge capacity is 455 mA · h/g in the tenth cycle. Results show that amorphous
ZnSnO3 exhibits the best electrochemical property among all of the tin-zinc composite oxides. With the formation of crystallites
in the samples, the electrochemical property of the tin-zinc composite oxides decreases.
Translated from Chem J Chin Univ, 2006, 27(12): 2252–2255 [译自: 高等学校化学学报] 相似文献