共查询到18条相似文献,搜索用时 156 毫秒
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以FeCl3·6H2O为原料,采用微波水解法,在三乙醇胺作用下合成了α-Fe2O3.X射线粉末衍射(XRD)、透射电镜表征结果表明:合成产物为纯a-Fe2O3,其粒径30 nm左右.气敏性能测试结果表明,以该法合成的α-Fe2O3为基体的气敏元件,对低浓度的H2S灵敏度也很高,5×10-6时达21.5倍、2×10-6时达16.4倍,而且响应恢复快,为应用前景良好的H2S敏感材料. 相似文献
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以无机物K3[Fe(CN)6]和La(NO3)3·nH2O为原料,用热分解配合物前驱体法制备了LaFeO3纳米粉体.用X-射线粉末衍射仪(XRD)和透射电镜(TEM)对产物的物相、形貌进行了表征.本工作还以沉淀法相同温度条件下煅烧出的LaFeO3作了对比.结果显示:热分解法在煅烧温度为700℃即可生成纳米晶LaFeO3,TEM显示产物为均匀的椭球形颗粒,充分表明该方法制备的材料具有良好分散性,且纯度较高.将合成材料制备成旁热式气敏元件,气敏性能测试结果表明:合成材料对H2S具有高的灵敏度和选择性,在192℃工作时,对35μL/L H2S气体的灵敏度可达72倍. 相似文献
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纺锤状氧化锌的制备及气敏性能研究 总被引:1,自引:0,他引:1
以硝酸锌和氢氧化钾为原料,采用传统的溶剂热法于150℃时合成了纺锤状氧化锌粉体,通过X射线衍射仪(XRD)和扫描电镜(SEM)及红外光谱仪(IR)对产物的物相、微观形貌及化学键进行了分析,结果表明,产物属于六方晶系纤锌矿结构的ZnO,结晶良好,呈规则的纺锤状,尺寸比较均一,长约20μm,利用该粉体制成厚膜型气敏原件,并用静态配气法测试其气敏性能,测试结果表明,纺锤状氧化锌在加热温度为220℃时对乙醇和丙酮气体具有很好的气敏性能,且具有很低的检测极限和极短的响应时间。 相似文献
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纳米SmFeO3的合成及其H2S敏感特性研究 总被引:1,自引:0,他引:1
以无机物K3[Fe(CN)6]和Sm2O3为原料,用热分解配合物前驱体法制备了复合氧化物SmFeO3纳米粉体.用X-射线粉末衍射仪(XRD)和透射电镜(TEM)对产物的物相、形貌进行了表征.结果显示:热分解法在煅烧温度为600℃即可生成纳米晶SmFeO3,TEM显示产物为均匀的椭球形颗粒,充分表明该方法制备的材料具有良好分散性,且纯度较高.将合成材料制备成旁热式气敏元件,气敏性能测试结果表明:合成材料对H2S具有高的灵敏度和选择性,在最佳工作电压4 V时对50μL/L H2S气体的灵敏度可达21.3倍,相对干扰气体C2H5OH来讲其选择性系数为4.44倍.而且响应很快,约2 s,但恢复稍慢,40 s左右. 相似文献
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一种新型金属复合氧化物半导体气敏材料体系 总被引:1,自引:1,他引:0
用NH4)2CO3作沉淀剂制得Cd:Sn=1:1的粉料,经750℃、15h热处理可得单相钛铁矿型β-CdSnO3。元件的电导-温度(G-t)特征表明β-CdSnO3为典型的表面电阻控制型气敏材料,无需掺贵金属催化剂就对还原性气体响很高的灵敏度。因此,β-CdSnO3很有希望作为一种新型的气敏材料体系。 相似文献
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Jyh-Jier Ho Y.K Fang K.H Wu W.T Hsieh C.H Chen G.S Chen M.S Ju Jing-Jenn Lin S.B HwangAuthor vitae 《Sensors and actuators. B, Chemical》1998,50(3):227-233
The paper reports the successful fabrication of ethanol gas sensors with tin-dioxide (SnO2) thin films integrated with a solid-state heater, which is realized with technologies of micro-electro-mechanical systems (MEMS), and are compatible with VLSI processes. The main sensing part with dimensions of 450×400 μm2 in this developed device is composed of a sensing SnO2 film, which is fabricated by electron-gun evaporation with proper annealing in ambient oxygen gas to yield fine particles and good structure. An integrated solid-state heater with a 4.5 μm-thick cantilever bridge (1000×500 μm2) structure is made of silicon carbide (SiC) material by MEMS technologies. The sensitivity for 1000 ppm ethanol gas reaches as high as 90 with 10 s and 2 min for the response and recovery time, respectively, at an operating temperature of 300°C. Those experimental results also exhibit a much superior performance to that of a popular commercial ethanol gas sensor TGS-822. Therefore, the developed sensor with high performance is a good candidate for some specific application in automobile to detect drink-drive limit and allows an array integration available with various films for controlling each element at separate resistance. 相似文献
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Carbon dioxide gas sensor using a graphene sheet 总被引:1,自引:0,他引:1
Hyeun Joong YoonAuthor VitaeDo Han JunAuthor Vitae Jin Ho YangAuthor VitaeZhixian ZhouAuthor Vitae Sang Sik YangAuthor Vitae Mark Ming-Cheng ChengAuthor Vitae 《Sensors and actuators. B, Chemical》2011,157(1):310-313
In this article, we report on a high-performance graphene carbon dioxide (CO2) gas sensor fabricated by mechanical cleavage. Unlike other solid-state gas sensors, the graphene sensor can be operated under ambient conditions and at room temperature. Changes in the device conductance are measured for various concentrations of CO2 gas adsorbed on the surface of graphene. The conductance of the graphene gas sensor increases linearly when the concentration of CO2 gas is increased from 10 to 100 ppm. The advantages of this sensor are high sensitivity, fast response time, short recovery time, and low power consumption. 相似文献
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采用一种可双峰分布的概率密度函数构建孔径分布模型,并与实验测量结果进行对比验证。建立了包含孔结构影响的气体扩散-反应数学模型,数值研究了多孔气体传感器内孔径分布形态对响应时间、灵敏度和选择性的影响规律。计算结果表明,双峰分布孔结构对提高传感器的气敏性能具有一定实际意义。孔结构变化时,孔内扩散阻力和比表面积呈相反变化趋势,共同影响传感器内被测气体的表面反应速率。多孔气体传感器对被测气体的80%响应时间随副峰概率的增大而逐渐缩短。多孔气体传感器的相对灵敏度则随副峰概率呈极值性变化,具有极大值。 相似文献