共查询到17条相似文献,搜索用时 953 毫秒
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张嘉琪胡馨升胡发志等 《传感器与微系统》2014,(4):14-16,20
主要介绍了ZnO纳米棒修饰的石英晶体微天平(QCM)气体传感器的制备与测试。采用两步法在石英晶振片表面制备直径为100 nm的ZnO纳米棒敏感膜,构成QCM NH3传感器。检测系统为自主研发的基于LabVIEW平台的QCM气体传感器频率测试软件。检测NH3的体积分数为5×10-6~50×10-6,响应时间均在10 s以内,最大频差值为10.9 Hz,响应最大频差值与NH3体积分数呈现良好的线性关系。室温条件下,ZnO纳米棒敏感膜可以完全实现吸附解吸过程,具有可逆性。该传感器性能稳定,响应灵敏,具有重复性。 相似文献
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沸石分子筛修饰的QCM类神经毒气传感器 总被引:1,自引:3,他引:1
研究了Cu2 -Beta型纳米分子筛对类神经毒剂DMMP有机气体的敏感特性,并结合高灵敏的石英谐振微天平(QCM)研制了DMMP气体的传感器.研究结果表明,选择Cu2 -Beta纳米分子筛作为敏感膜对DMMP气体的检测灵敏度大大提高,达到14.481 1 Hz/lg(C/ppm).在0.2 ppm DMMP气体浓度下,传感器的响应时间和恢复时间分别为40 s和100 s,响应达到103Hz.同时经过高温和水汽吹扫脱附处理,该传感器表现了较好的重复性. 相似文献
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一种新型石英晶振微天平水果气体传感器研究 总被引:1,自引:0,他引:1
为监测水果在仓储、运输等过程中的新鲜程度,研制了一种石英晶振微天平(QCM)气体传感器。以基频6 MHz的石英晶体为基片,运用一步原位聚合法在其上沉积了对甲苯磺酸(TSA)掺杂聚苯胺气敏薄膜,制作出QCM水果气体传感器。搭建了测试平台,设计了相应的起振、整形、差频、频压转换及数据采集电路。在室温下,测试了该传感器对放置不同天数的苹果释放气体的敏感特性。实验结果表明,在一定范围内,TSA掺杂浓度增加会改善传感器的气敏性能。传感器对放置不同天数的苹果释放气具有不同的响应特性,且具有灵敏度高、线性度好、响应速度快、重复性好等优点,有望在水果仓储运输方面得以应用。 相似文献
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聚苯胺/氧化铟复合薄膜QCM气体传感器 总被引:2,自引:1,他引:1
在10℃条件下,运用静电力自组装和原位化学氧化聚合相结合的方法制备了聚苯胺/氧化铟(PANi/In2O3)复合薄膜,并通过紫外-可见光光谱分析和扫描电镜(SEM)对薄膜进行了分析表征。采用AT-切型Ag电极石英晶体微天平(QCM)制备了PANi/In2O3气体传感器,常温下研究了它对瓦斯中主要成分CH4和CO气体以及常见干扰气体NH3的敏感特性。结果表明,PANi/In2O3复合薄膜对CH4和CO均呈现出较好的线性敏感性能,而对NH3则表现为非线性。 相似文献
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Inorganic/organic composites are very attractive due to synergetic behavior and a wide range of potential use. A polyaniline–TiO2 nano-composite, obtained by combination of chemical polymerization and a sol–gel method, was deposited on the electrode of quartz crystal to implement a quartz crystal microbalance (QCM) chemical sensor. The morphology of the composite film was studied by scanning electron microscopy (SEM) measurements. The coated quartz crystal and a non-coated quartz crystal were mounted in a sealed chamber, and their frequency difference was monitored. When analyte vapor was injected into the chamber, gas absorption decreased the frequency of the coated quartz crystal and thereby caused an increase of the frequency difference between the two crystals. The frequency difference change response towards trimethylamine was evident and could be recovered by N2 purgation easily. The calibration curve towards trimethylamine, its long-term stability and selectivity were investigated. The thermal behavior of the sensing characteristics was compared with that of a polyaniline QCM sensor. Fourier transform infrared (FTIR) spectra of polyaniline and polyaniline–TiO2 nano-composite and QCM data under various conditions were used to study the effect of thermal treatment. 相似文献
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An odor sensing system using a quartz crystal microbalance (QCM) sensor array and pattern recognition technique has been for years a main research topic in our group. For the general field of artificial olfaction using acoustic-wave based sensors such as QCMs it is vital to search for novel sensing materials. Here we present recent results of our ongoing study on application of pegylated lipids as coatings for QCM odor-sensors. The method presented herein is based on self-assembling of lipids and lipid-derivatives on the QCM surfaces. The disulphide-terminated lipids and lipopolymers are co-chemisorbed onto gold electrodes of QCM sensors by simple immersion in ethanolic solutions. This creates porous supports onto which additional layers of lipopolymers are physisorbed. The method allows for fabrication of lipopolymeric QCM odor-sensors with enhanced sensitivity to odorants, capable of very good discrimination among odorant samples—according to the functional group of an odorant. 相似文献
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Sindhuja SankaranAuthor Vitae Suranjan PanigrahiAuthor Vitae Sanku MallikAuthor Vitae 《Sensors and actuators. B, Chemical》2011,155(1):8-18
Our major goal in developing intelligent quality sensors is to detect bacterial pathogens such as Salmonella in the packaged beef. Olfactory sensing of specific volatile organic compounds released by the bacterial pathogens is one of the unique ways for determining contamination in food products. This work aims at developing a biomimetic piezoelectric olfactory sensor for detecting specific gases (alcohols) at low concentrations.The computational simulation was used to determine the biomimetic peptide-based sensing material to be deposited on the quartz crystal microbalance (QCM) sensor. Tripos/Sybyl®8.0 was used to predict the binding site of an olfactory receptor and determine the binding affinity as well as orientation of the selected ligands (specific molecules) to the olfactory receptor. The designed polypeptide sequence based on the simulation program was synthesized and used as a sensing layer in the QCM crystal. The developed QCM sensors were sensitive to 1-hexanol as well as 1-pentanol as predicted by the simulation algorithm. The estimated lower detection limits of the QCM sensors for detecting 1-hexanol and 1-pentanol were 2-3 ppm and 3-5 ppm, respectively. This study demonstrates the applicability of simulation-based peptide sequence that mimics the olfactory receptor for sensing specific gases. 相似文献
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Weili HuAuthor VitaeShiyan ChenAuthor Vitae Luting LiuAuthor VitaeBin DingAuthor Vitae Huaping WangAuthor Vitae 《Sensors and actuators. B, Chemical》2011,157(2):554-559
A novel formaldehyde sensor based on nanofibrous polyethyleneimine (PEI)/bacterial cellulose (BC) membranes coated quartz crystal microbalance (QCM) has been successfully fabricated. The nanoporous three-dimensional PEI/BC membranes are composed of nanofibers with diameter of 30-60 nm. The sensor showed high sensitivity with good linearity and exhibited a good reversibility and repeatability towards formaldehyde in the concentration range of 1-100 ppm at room temperature. Moreover, the results showed that the sensing properties were mainly affected by the content of PEI component in nanofibrous membranes, concentration of formaldehyde and relative humidity. Additionally, the nanofibrous PEI/BC membrane coated QCM sensors exhibited a good selectivity to formaldehyde when tested with competing vapors. The simple and feasible method to prepare and coat the PEI/BC sensing membranes on QCM makes it promising for mass production at a low cost. 相似文献
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We report application of the PEGylated lipids (PEG lipopolymers) containing disulphide as supports for sensing films for quartz crystal microbalance (QCM) odor sensors. The materials are binding covalently to the surface of gold QCM sensor electrode creating self-assembled cushion. Additional amounts of lipid or lipid-derived materials can be physisorbed on that chemisorbed coating. Both processes do not require much labor and can be performed with minimum instruments in a simple process. The sensors fabricated with the chemisorbed supports are more sensitive to the tested odorants than their non-supported counterparts. Enhanced sensitivity is derived from higher fluidity of the supported films in comparison to the non-supported ones. Discrimination capability among odorants is also better for the sensors with chemisorbed supports than for the non-supported ones—there are no overlaps between the sample groups and the samples are clustered closely within the groups. Overall, the studied supported sensors introduce interesting properties that can be utilized in the odor sensing systems using QCM sensors. 相似文献