NASICON基NO_2气体传感器

文中介绍了一种管式结构的固体电解质NO_2气体传感器.该传感器是用溶胶–凝胶法制备的NASICON(钠离子导体) 为导电层材料,利用化学沉淀法制备的NiO和贵金属Au作为敏感电极材料制得的.文中研究了不同敏感电极材料对气体传感器性能的影响.以NiO+Au 作为敏感电极材料的传感器具有较大的灵敏度,当工作温度在300 ℃时,对浓度为(5～200)×10-6的NO_2表现出了良好的气敏性能,传感器的灵敏度大于70 mV/decade.     

NASICON固体电解质气体传感器的研究进展

采用高温固相法、溶胶-凝胶法制备了NASICON固体电解质材料,并利用XRD、IR、Raman、SEM等现代分析手段对NASICON材料进行了分析表征,优选出NASICON材料制备的工艺条件.对制备不同检测气体所需的敏感电极材料组份及制备方法进行了比较系统的研究.并以NASICON为离子导电层,以BaCO3-Li_2CO_3、Na_2SO_4-Li_2SO_4等复合盐以及单一或复合金属氧化物为敏感电极材料,制作出了具有良好性能的CO_2、CO、SO_2、NO_2、H_2S、Cl_2、NH_3等分立器件和集成一体化的CO-C_7H_8(甲苯)、NH_3-C_7H_8两种双功能器件.     

具有低辐射热的热导气体传感器设计与实现

针对传统热导传感器在高温工作条件下辐射热较高,造成传感器响应时间慢、检测精度低的问题,基于GO(氧化石墨烯)/α-Al_2O_3内外核结构设计并研制了具有低辐射热的热导气体传感器,省去了传统热导传感器制备的黑化步骤,并通过ANSYS有限元方法对所设计热导传感器的温度场进行仿真分析。GO载体材料采用氧化插层法制备,α-Al_2O_3载体材料采用化学沉淀法制备,经透射电镜观察,GO呈导热微片结构,α-Al_2O_3具有良好的低发射率颗粒状结构。测试结果表明:传感器具有良好的线性输出特性与功耗利用率,对CO_2气体的响应时间为27 s,恢复时间为16 s,灵敏度为0.26 mV/1%CO_2气体。     

Ag-WO_3基传感器对NO_2气敏特性的研究

Ag-WO_3纳米复合材料通过低温溶胶凝胶法(sol-gel)和共渍法成功合成,并且基于该纳米复合材料制备了检测低浓度NO_2气体的旁热式气敏元件。研究了100～300℃的温度范围内该传感器对H_2S、CO、NO_2、C_2H_5OH、CH_3COCH_3的气敏性能。结果表明,质量分数为1.0%Ag-WO_3气敏传感器对10 ppm的NO_2气体展现了最高的灵敏度和选择性。同时对Ag-WO_3气敏传感器探测气体前后的气敏机理进行了讨论和分析。     

氧化镍氧敏材料的研究

笔者对一种新型的氧气敏材料--P型氧化物半导体材料NiO进行了研究探讨,文章叙述了NiO对氧气的敏感机理,详细介绍了NiO氧敏材料的制备方法,给出了用不同方法制备出的NiO敏感材料的性能测试结果.     

多层Au-Pd核壳纳米颗粒膜增敏的光纤氢气传感器

高灵敏度、快速响应的光纤氢气传感技术是未来氢气传感技术的发展方向,对保障氢能系统安全具有重要意义。针对纳米尺度的钯基氢敏材料难以与光器件耦合的问题,本文采用水相合成及离心沉积方法制备具有快速氢气响应特性的Au-Pd核壳纳米颗粒膜,搭建了含有Au-Pd核壳纳米颗粒氢敏膜阵列的透射式传感系统,实现了光信号与多层纳米颗粒膜阵列的耦合,通过提高敏感材料对光信号的调制能力增强了传感器的灵敏度。实验研究表明,本文制备的AuPd核壳纳米颗粒膜粒径为48nm,Pd层厚度约为4nm。该敏感薄膜对4%浓度氢气的响应时间小于3s,且在循环测试中显示了良好的重复性和稳定性。通过3片薄膜阵列传感,在不影响传感器响应速度的同时将传感器灵敏度提升至最高,为单片膜的2.7倍。该研究为开发高性能光纤氢气传感器提供了重要指导。     

厚膜一体化温湿度传感器中热敏材料的制备工艺及机理研究

概述了一体化温湿度传感器的特点及发展现状，对厚膜一体化温湿度传感器中热敏材料的设计、制备方法及特性进行了深入的研究，对实验结果进行了分析讨论。给出与一体化传感器中湿敏材料相匹配的负温度系数热敏材料的成分与阻温特性的关系，制备工艺对阻温特性及材料粒度、粒度均匀性的影响，同时，还给出了几组热敏材料的实验数据和用此材料制备的一体化厚膜温湿度传感器的特性曲线。     

光沉积Pd修饰Bi_2WO_6微米花用作乙醇气敏传感器

为了提高纯Bi_2WO_6对乙醇的气敏性能,通过光沉积的方法在纯Bi_2WO_6表面修饰了贵金属Pd。并探究了其对乙醇的气敏性能。实验结果表明,在300℃时,Pd修饰的Bi_2WO_6微米花传感器对200 ppm(1 ppm=10~(-6))乙醇的灵敏度均高于纯Bi_2WO_6。当Pd的修饰量质量分数为0.05%时,灵敏度最大,达到了72,是纯Bi_2WO_6的6.5倍左右。该传感器响应恢复时间分别为7 s和3 s,且表现出良好的选择性。     

不同稀土元素掺杂对YBa2Cu3O7-δ氧传感器性能的影响比较

为验证稀土元素掺杂对YBa2Cu3O7-δ作为氧传感器气敏材料性能的影响,在Al2O3衬底上制备了3种不同稀土元素掺杂的YBa2Cu3O7-δ厚膜,然后对3种厚膜在不同气氛变换时电阻随时间的变化关系及其电学特性进行比较,发现3种厚膜的各组样品仍然表现出YBCO的基本性质,其中Y0.95La0.05Ba2Cu3O7-δ样品表现出较高的灵敏度和较短的恢复时间,是替代 YBa2Cu3O7-δ作为氧传感器新的理想材料.     

烧结温度及掺杂TiO2对ZnO气敏性能的影响

通过溶胶-凝胶法制备ZnO凝胶,在300℃预烧结.为了得到不同尺寸的ZnO粉体,并对ZnO粉体进一步纯化,将预烧粉体在不同温度,500℃、700℃、900℃下缓慢烧结,最后将所得粉体涂附在陶瓷管上,在450℃下烧结制备成气敏元件.测试所得的气敏元件对丙酮、乙醇、甲苯这些VOC气体的灵敏性.实验结果表明,500℃下烧结的粉体所作成的器件,对气体具有最大的灵敏度,其原因为随着烧结温度的增加,ZnO的颗粒变大,从而限制了固体与气体的反应面积.再以TiO2材料为掺杂剂,研究掺杂后元件的气敏特性.乙醇和甲苯的最佳工作电流得到了降低,这一现象,将有助于降低器件的工作温度,这也是目前研究ZnO气体传感器主要需要解决的问题.     

Analysis of nanocrystalline films on rough substrates

In this work, we propose a method to estimate basic parameters like the rms roughness and the mean grain size of nanocrystalline thin films on rough substrates. The method is based on the analysis of the power spectral density (PSD) of the surface profile, which allows distinguishing between the two participating components from surface and film. The effectiveness will be demonstrated for thin NiO(x) layers for gas sensing on Al(2)O(3) ceramic substrates, and for protective WC coatings on steel.     

四针状纳米氧化锌的乙醇气敏性能的研究

采用高温气相氧化法,以锌粉为原料,制备了四针状纳米氧化锌.主要对四针状纳米氧化锌的酒精气敏特性进行了研究,测试在不同浓度的酒精气氛下,传感器的灵敏度和响应特性,结果表明:四针状纳米氧化锌对酒精的灵敏度较高,特别适合于检测低浓度的酒精,同时对酒精的响应、恢复时间都很短.     

Fabrication of resistance type humidity sensor based on CaCu3Ti4O12 thick film

A resistance type humidity sensor has been fabricated from an assembly of CaCu₃Ti₄O₁₂ thick film, Ag interdigitated electrodes, and an Al₂O₃ ceramic substrate. The humidity sensing properties were measured using the direct current (DC) analysis method. The results show that the electrical properties of the CaCu₃Ti₄O₁₂ thick film are dependent on humidity and applied voltage. At low humidity, the film exhibited low conductivity and behaved as an insulator. However, at high humidity, the conductivity of the film increased due to the enhancement of ion conduction. These outcomes indicate that the measured resistance is highly dependent on the applied bias voltage within the whole humidity range i.e. 20–90% relative humidity (RH) at ambient temperature. The response and recovery times as well as sensitivity were determined to be around 2.8 min, 25 min, and 98.2%, respectively. Therefore, it is concluded that CaCu₃Ti₄O₁₂ thick film has good humidity sensing properties and has high potential in the application for fabrication of high-performance humidity sensors.     

压力传感器厚膜温度补偿技术研究

采用厚膜电路制造技术实现硅基压力传感器的温度补偿,不仅可以使传感器的补偿精度高、补偿温区宽,而且可以使传感器的可靠性、抗震动性、耐高低温冲击性以及传感器的外观品质得以全面提升。文中介绍了压力传感器温度补偿电阻网络的原理、厚膜电路的设计和制造技术、网络阻值调整等方面的研究,通过合理的版图、结构和工艺设计,实现了OEM压力传感器的温度补偿,已在压力传感器产品的生产中得到成功应用。     

Developing of N‐(4‐methylpyrimidine‐2‐yl)methacrylamide Langmuir–Blodgett thin film chemical sensor via quartz crystal microbalance technique

In the present work, the characterization and gas sensing properties of newly synthesized N‐(4‐methylpyrimidine‐2‐yl)methacrylamide ( N‐MPMA ) monomer Langmuir–Blodgett (LB) thin films were investigated. The UV–visible spectroscopy, quartz crystal microbalance (QCM), and atomic force microscopy were utilized to characterize N‐MPMA LB thin films. The surface behavior of N‐MPMA monolayer was stable and allowed an effective transfer at a surface pressure of 14 mN/m. The mass change/unit area value of the N‐MPMA LB thin film deposited quartz crystal surfaces was investigated. The amount of N‐MPMA LB thin film deposited on the substrate for bilayer was calculated as 228.72 ng (86.31 ng/mm²) and 12.5 Hz frequency shift was observed for each layer of the N‐MPMA film. The kinetic responses of N‐MPMA LB film against chloroform, dichloromethane, benzene, and toluene were measured via QCM system at room temperature. N‐MPMA QCM sensor results displayed that chloroform has the largest frequency shifts compared with the other vapors used in the present work and these results can be illuminating in terms of physical properties of organic vapors.     

角度指示型表面等离子共振传感器的研究

表面等离子体共振(SPR)技术被广泛应用于生物化学传感、药物分析和环境监测等领域。现基于表面等离子共振原理,在固定入射光波长为632.8nm的He-Ne激光入射下,采用镀有50nm银膜的Kretschmann棱镜型结构作为耦合器件,实现角度指示型SPR传感器对纯净水和酒精水溶液的检测。实验结果发现该SPR传感器具有较好的稳定性,其角度灵敏度达到219°/RIU。     

Development of cylindrical hot-film sensors for measuring instant velocity of fluid flow

The cylindrical hot-film sensor has found wide industrial application because it combines the high frequency response with improved strength and stability. In this work, such sensors were fabricated for application in different fluids. The sensing part of the sensor consisted of a nanostructured sandwich with a 40-60 nm thick nickel film deposited by PVD process onto a 125 micrometer diameter cylindrical quartz wire. An outer 0.5 or 2 micrometer thick protective silica layer was applied onto the nickel film. The sensors obtained were subjected to various functional and quality assessment tests. Using a constant temperature anemometry (CTA) circuit, the sensors were calibrated conforming to well-known procedures. Furthermore, an evaluation of the sensor response was undertaken by measuring an already known turbulent flow and comparing the results with those of the literature. Finally, technical conclusions were drawn from the results.     

In_2O_3纳米材料的制备及其气敏特性的研究

文中采用溶胶 -凝胶法合成了In2 O3纳米粉体 ,确定其晶体结构并掺入Co3O4 、Au等掺杂剂制成烧结式器件 ,该器件对CO气体具有较高的灵敏度 ,良好的响应恢复特性和选择性