共查询到18条相似文献,搜索用时 46 毫秒
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以CuCl2·H2O为主要原料,抗坏血酸作还原剂,聚乙二醇-20000(PEG-20000)作表面活性剂,利用化学混合法制备了纳米晶结构的Cu2O纳米立方体。研究了pH值对Cu2O纳米结构的影响,并用XRD和SEM对产物的物相和形貌进行了表征。将粉体制成气敏元件,气敏性能测试结果表明:该Cu20纳米晶对乙醇气体具有较高的灵敏度和选择性。600℃热处理2h材料气敏特性最好,在最佳工作温度(360℃)下对体积分数为0.006%的乙醇气体灵敏度可达到38%,达到了口腔乙醇气体体积分数检测限度0.008%的要求。 相似文献
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将有机金属先驱体[Sn(N(CH3)2)2]2在适当的条件下热解,制备了尺寸分布集中的SnO2纳米颗粒.然后,在气体传感器的多晶硅层上原位沉积纳米颗粒悬浮液得到纳米颗粒多孔薄膜传感层,并探索了SnO2纳米颗粒传感器原位掺杂Mg,K,Ba元素,检测气体传感器在不同CO2体积分数下的敏感性.结果表明:此方法制得的传感器对CO2气体敏感性不佳,尚需进一步研究掺杂元素和掺杂工艺. 相似文献
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纳米技术在半导体陶瓷气体传感器中的应用 总被引:8,自引:1,他引:7
纳米技术可获得高活性的气敏陶瓷材料,利用纳米技术的二大效应即表面效应和量子尺寸效应,可使气体传感器的灵敏度和选择性提高,着重地介绍气敏材料纳米化的机理基础,制备方法及工艺控制。 相似文献
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宿元斌 《电子制作.电脑维护与应用》2006,(7):68-68
在有毒气体报警器的设计制作中,气敏传感器通常选用加热式、旁热式及催化燃烧式的半导体气敏元件。由于该类元件在工作时需要加热,元件长时间处于较高温度状态下,引起灵敏度变化,需要定期对气敏元件进行标定,给使用带来不便,同时由于加热也使得元件的功耗较大。下面介绍一款由非加热式气敏传感器构成的简易有毒气体报警器,可以克服以上不足。电路原理图如附图所示。气敏传感器采用非加热式气敏传感器TP-1.1A,它是采用纳米SnO2进行半导体掺杂,以微珠结构制成的非加热式低功耗气敏传感 相似文献
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用于实时、动态检测多组分气体的多传感器技术与电化学传感器系统 总被引:1,自引:0,他引:1
依据待测多组分气体交叉反应的动力学特性和暂态电化学原理,融合计算机控制的快速电势调制方法,提出并建立了基于单个气敏微电极的多传感器技术,构建了一类新的电化学多组分气体传感器系统.该系统既保持了电化学传感器的优点,又具备信息采集和处理的能力,成功地将单个气敏电极对多组分气体交叉敏感的致命缺陷转化为快速同时检测多组分混合气体的动力学条件加以利用,用单个气敏元件(电极)实施多组分气体的实时、动态检测.本文还就传感器系统的暂态电化学响应机制、检测精度、测量速度和连续检测的长期稳定性作了讨论. 相似文献
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NO_2气体传感器敏感材料 总被引:7,自引:2,他引:5
描述了近十年来用作NO2 气体传感器的酞菁类和氧化物半导体敏感材料。总结了这两类材料的成膜条件、薄膜表面形态和结构以及它们的敏感特性。为优化薄膜的气敏特性提供了参考 相似文献
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Ken-ichi Isao Hiroyuki Shiro Satoshi Wataru Atsushi 《Sensors and actuators. B, Chemical》2009,141(2):410-416
Resistive electrochemical sensors based on vanadium oxides equipped with a pair of interdigital Au electrodes can detect NH3 gas selectively at high temperature (500 °C). NH3 addition in a base gas increased the relative conductance (σ/σ0). Addition of less electronegative cation (Ce, Zr, Mg) to V2O5 increased the response and recovery rates, while electronegative cation (Al, Fe, Ni) increased sensor response magnitude. Among the samples tested, Al and Ce co-doped sample (VAlCe) was the most suitable sensor. The VAlCe sensor responded rapidly and linearly to change in concentration of NH3 in the oxygen rich gas mixture and showed high selectivity in the presence of coexisting gases (NO, CO, H2). The presence of water vapor did not markedly decrease the response magnitude but increased the response rate; the 90% response and 50% recovery times were less than 15 s. Based on the in situ UV–vis results, a possible sensing mechanism is proposed; adsorbed NH3 causes reduction of V5+ to V4+, which results in the conductivity increase. Role of surface acidity on the selective detection of NH3 as a basic molecule is also discussed. 相似文献
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K. Wetchakun T. Samerjai N. Tamaekong C. Liewhiran C. Siriwong V. Kruefu A. Wisitsoraat A. Tuantranont S. PhanichphantAuthor vitae 《Sensors and actuators. B, Chemical》2011,160(1):580
This article extensively reviews the recent development of semiconductor metal oxide gas sensors for environmentally hazardous gases including NO2, NO, N2O, H2S, CO, NH3, CH4, SO2 and CO2. The gas sensing properties of differently-prepared metal oxides and loaded metal oxides towards nine environmentally hazardous gases have been individually compared and digested. Promising materials for sensitive and selective detection of each hazardous gas have been identified. For instance, unloaded WO3 nanostructures are the most promising candidates for NO2 sensing while metal catalyst loaded WO3 and gold-loaded SnO2 sensors are among the most effective for NO and N2O sensing, respectively. Moreover, related gas-sensing mechanisms are comprehensively discussed. 相似文献
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CuO—ZnO异质结气体传感器是一种新型的气体传感器,它有成本低、工艺简单、检测方便等诸多优点。主要研究了CuO和ZnO不同比例情况下,该传感器的气敏性能。测试了它的阻温特性,及在不同温度、不同气氛条件下的灵敏度和响应特性,并从理论上对测试结果进行了分析和讨论。 相似文献
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In order to determine the correlation between the gas-sensitive properties of the thermocatalytic gas sensor (TGS) and the porous structure of the carrier, two types of carriers have been investigated. Their sorptional parameters at different calcination temperatures have been studied. The parameters of the porous structure and the gas-sensitive properties of the TGS are characterized by measurements of benzene vapour adsorption and methane oxidation using methane/air mixtures, respectively. The obtained data indicate that the sensitivity of the TGS is related in some way with the structural parameters of the carrier (pore size and diameter distribution). Carriers must have a sorption capacity no less than 0.30 cm3 g−1, surface area of 100–140 m2 g−1 and possess biporous pore-volume size distribution. 相似文献
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