共查询到19条相似文献,搜索用时 170 毫秒
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基于碳纳米管微传感器阵列和随机共振的气体检测方法研究 总被引:4,自引:2,他引:2
提出了一种基于多壁碳纳米管微传感器阵列和非线性随机共振算法的新型气体检测方法。微传感器阵列包括碳纳米管阳极传感器和碳纳米管阴极传感器以减小检测系统的交叉灵敏度。实验检测了乙醇、丙酮和氨气三种气体,传感器阵列响应输入随机共振系统进行处理,结果表明,信噪比曲线参数能够标定气体浓度和种类,且随机共振处理方法可以有效的降低系统的交叉灵敏度,检测系统具有较好的灵敏度和重复性,具有较好的实用价值。 相似文献
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阐述了高压电气设备绝缘故障在线检测的一些方法,介绍了碳纳米管气体传感器近期的研究动向和取得的成果。应用碳纳米管气体传感器监测电气设备绝缘故障特征气体时,重点介绍了纯SF6,SF6/N2混合气体中局部放电产生的气体分解组分在电压、气体压强、温度等因素下对气体传感器的影响。并提出了碳纳米管气体传感器在高电压设备在线检测领域研究中所存在的问题和未来的研究发展方向。 相似文献
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MWCNT-WO3薄膜双声路SAW NO2气体传感器 总被引:1,自引:0,他引:1
以金属钨粉,H2O2,CH3OH和多壁碳纳米管(MWCNT)为原料,在双声路声表面波(SAW)器件的测量声路上制作了MWCNT-WO3薄膜,提出并实现了一种MWCNT-WO3薄膜双声路SAW NO2气体传感器。由于MWCNT和WO3对NO2气体都有敏感作用,而且碳纳米管的毛细作用、以及MWCNT的加入都增加了气体的接触面积,提高了NO2气体的吸附和敏感作用。同时,SAW器件的双声路结构消除了由于外界测量条件改变引起的测量误差,也进一步提高了传感器的可靠性和准确性。实验结果表明,该传感器对各种浓度的NO2气体具有好的响应特性,在31.2×10-9到20×10-6范围内,传感器的响应灵敏度为9.8kHz/1×10-6,比单一MWCNT或WO3薄膜对NO2气体具有更好的灵敏度和线性特性。 相似文献
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Irene Taurino Sandro Carrara Mauro Giorcelli Alberto Tagliaferro Giovanni De MicheliAuthor vitae 《Sensors and actuators. B, Chemical》2011,160(1):327
In this study, we report on multi-walled carbon nanotubes fabricated on silicon substrate with four different orientations via chemical vapor deposition. It is well-known that chemical treatments improve the nanotube electrochemical reactivity by creating edge-like defects on their exposed sidewalls. Before use, we performed an acid treatment on carbon nanotubes. To prove the effect of the treatment on these nanostructured electrodes, contact angles were measured. Then, sensitivities and detection limits were evaluated performing cyclic voltammetry. Two target molecules were used: potassium ferricyanide, an inorganic electroactive molecule, and hydrogen peroxide that is a product of reactions catalyzed by many enzymes, such as oxidases and peroxidases. Carbon nanotubes with tilted tips become hydrophilic after the treatment showing a contact angle of 22° ± 2°. This kind of electrode has shown also the best electrochemical performance. Sensitivity and detection limit values are 110.0 ± 0.5 μA/(mM cm2) and 8 μM for potassium ferricyanide solutions and 16.4 ± 0.1 μA/(mM cm2) and 24 μM using hydrogen peroxide as target compound. Considering the results of wettability and voltammetric measurements, nanotubes with tilted tips-based electrodes are found to be the most promising for future biosensing applications. 相似文献
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For the defect that the mechanical properties of polypyrrole supercapacitors decrease with charge and discharge cycles, and
the cycle stability is poor, a compound method of polypyrrole electrode for supercapacitors based on multi-walled carbon nanotubes
is proposed. The structure of the formed polypyrrole coated multi-walled carbon nanotubes effectively increase the specific surface
area of the electrode material, the utilization rate of the active material and the electrical conductivity, improve the rapid charge and
discharge performance of the electrode material, and greatly improve cyclic stability of polypyrrole. The composite electrode materi-
al of polypyrrole and functionalized multi-walled carbon nanotubes for supercapacitors is prepared by pulse current deposition meth-
od. It is scanned at a scanning rate of 1000mV?s -1 in a 3mol?L -1 potassium chloride electrolyte, after 100,000-cycle, the capacity on-
ly declines by 16%. 相似文献
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Yan-Ling LuoAuthor Vitae Bi-Xia WangAuthor VitaeFeng XuAuthor Vitae 《Sensors and actuators. B, Chemical》2011,156(1):12-22
A series of multi-walled carbon nanotubes/polyurethane (MWNTs/PU) composite conducting dispersoids were prepared via an in situ coupling reaction among linear hydroxyl-terminated polymer diols, 1,6-hexamethylene diisocyanate (HDI) and various chain extenders. The composite conducting thin films were formed by spin-coating and depositing the dispersoids onto comb-like electrode substrates. The resulting structure and the dispersion quality of MWNTs in the dispersoids were examined by means of FTIR, XRD, TEM, SEM and UV-vis analyses. The response of the as-prepared films toward some volatile organic solvent vapors such as benzene, anhydrous ether, acetone and chloroform was evaluated. The experimental results indicated that the composite conducting films constructed by hydroxyl-terminated poly(butadiene-co-acrylonitrile), trimethylolpropane, and MWNTs-OH bear better vapor responsiveness. The dispersion behavior of MWNTs in the dispersoids, types of MWNTs and soft-hard segmental compositions are believed to be closely related with the sensing properties of the films. In particular, the chemical linkage of MWNT-OH with HDI in the PU matrix is expected to improve the dispersivity and further to enhance the sensing properties of the composite sensors. The vapor sensing properties well reveal that these materials have a possibility as a candidate of volatile organic solvent vapor sensors. 相似文献
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I. SayagoAuthor Vitae M.J. FernándezAuthor VitaeJ.L. FontechaAuthor Vitae M.C. HorrilloAuthor VitaeC. VeraAuthor Vitae I. ObietaAuthor VitaeI. BusteroAuthor Vitae 《Sensors and actuators. B, Chemical》2011,156(1):1-5
Surface acoustic wave (SAW) gas sensors based on polyisobutylene (PIB) and composites (PIB and carbon nanotubes) as sensitive layers were investigated for the detection of octane and toluene (volatile organic compounds) and other atmospheric pollutants (H2, CO, NO2 and NH3) at room temperature. In order to study the effect of nanotubes in the response of SAW sensors, several composites based on PIB with different percentages of multiwalled carbon nanotubes (MWNTs) were tested and compared to the response obtained from PIB SAW sensors. Sensors exhibit high responses and selectivity to volatile organic compounds (VOCs) with fast response and recovery times as well as good repeatability and reproducibility. Experimental results show as small percentages of nanotubes improve the response to octane. 相似文献
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该文报道了一种新的基于复杂多壁碳纳米管衍生物为载体的铝离子碳糊电极。引入的碳糊电极,在很大程度上改善了铝离子电极的线性范围、检出限、pH值范围及响应时间等。此外,该电极具有较高选择性和较长的使用时间(超过3个月)。该文课题组选择分离溶液法(ssM)测定铝离子碳糊电极的选择性系数,该电极对铝离子具有很好的选择性。重要的是.该文课题组采用交流阻抗法和紫外一可见光谱技术研究了电极的响应机理。最后,该电极被成功地应用于环境样品中铝离子浓度的测定。 相似文献
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