共查询到18条相似文献,搜索用时 93 毫秒
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以溶胶-凝胶法制备了SnO2纳米粒子,以原位聚合沉积法在陶瓷基底叉指金电极上制备了PANI及PANI/SnO2复合薄膜,形成气敏元件。室温下测试了元件对氨气及水果释放气体的敏感特性。结果表明,PANI和PANI/SnO2复合膜对氨气具有选择性好,线性度好的特点,PANI比PANI/SnO2复合膜的灵敏度高,更适合在较宽浓度范围内测试氨气;另外,这两种传感器对存放的水果(香蕉、苹果)释放气体具有响应恢复快,重复性好等特性,PANI/SnO2复合膜对水果释放的气体比PANI具备更高的灵敏度,有望在水果仓储运输方面得以应用。 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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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:2,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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碳纳米管作为一种新型材料,是目前科研的热点,分子模拟在其中已经得到了广泛应用,并对碳纳米管的应用具有较好的指导意义。本文介绍了近几年国内外应用分子模拟技术辅助碳纳米管研究的部分工作,主要包括碳纳米管力学性能和电学性能的模拟、碳纳米管储气能力和反应性能的研究,以及在聚合物/碳纳米管复合材料中的应用等。 相似文献
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本文研制了一种基于聚苯胺(PANI)的石墨pH电极,并将其成功地应用于CO2的检测中。在苯胺和盐酸的混合液中采用循环伏安法实现苯胺在石墨电极上的电聚合。实验表明,此基于聚苯胺的石墨pH电极在pH 1-12的范围内呈现出很好的响应:-63.80 mV/pH(T=23 ℃),-65.81 mV/pH (T=48 ℃)。根据Severinghaus原理,研究了此传感器在pH 4-9内的pH响应情况,证明此聚苯胺修饰的石墨pH电极可被成功地应用于CO2的检测中,此CO2传感器在CO2浓度为0~1000 mbar的范围内,呈现很好的响应特性:S=42.25 mV/pCO2(mbar)=0.61 pH/pCO2(mbar),且线性度为0.9839。因此,本文研制的基于PANI的石墨pH电极可应用于生物冶金中pH和CO2的检测中。 相似文献
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在对某些非线性动力学系统中,存在着随机共振现象,它不是通过消除噪声而是利用噪声来达到检测微弱信号的目的,随机共振是非线性动力系统中的普遍现象,它向人们展示了噪声在非线性体系中的积极作用.本文对纳米碳管气体放电气敏传感器中的随机共振现象进行了研究,利用纳米碳管电极作为气敏传感器阳极,在以空气为目标气体的传感器检测系统中观察到二重随机共振现象.提取放电周期脉冲信号,利用高斯白噪声调制放电周期脉冲信号,输出信噪比的仿真结果与实际观察到的二重随机共振现象一致. 相似文献
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基于气体电晕放电原理,利用纳米碳管独特的物理结构和尖端发射效应,提出了一种新型的纳米碳管离子型气体传感器.采用阳极氧化铝模板法生长的定向纳米碳管阵列所构成的传感器,纳米碳管和电极是一体的,简化了器件结构和工艺.在外加直流电压激励下,纳米碳管顶部形成很强的非均匀电场,在电压相对低的情况下能很容易地电离气体,根据气体的击穿电压和放电电流来实现对单一气体和确定性混合气体的检测.为了提高检测混合气体的灵敏度,创新地在检测回路中引入随机共振发生装置,有效地提高了混合气体浓度检测的范围.实验中还分析了温度、湿度对传感器的影响,对该传感器的性能也作了评价.实验结果表明该传感器具有选择性好、体积小、响应时间快、灵敏度高、稳定性好,室温操作等优点,而且实现方便,操作简单,有较大的实用价值. 相似文献
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In the present study, a new soft computing framework is developed for solving nanofluidic problems based on fluid flow and heat transfer of multi-walled carbon nanotube (MWCNT) along a flat plate with Navier slip boundary with the help of artificial neural networks (ANNs), Genetic Algorithms (GAs), Interior-Point Algorithm (IPA), and hybridized approach GA-IPA. Original PDEs associated with the problem are transformed into system of nonlinear ODEs using similarity transformation. Mathematical model of transformed system is constructed by exploiting the strength of universal function approximation ability of ANNs and an unsupervised error function is formulated for the system in a least mean square sense. Learning of the design variable of the networks is carried out with GAs supported with IPA for rapid local convergence. The design scheme is applied to solve number of variants by taking water, engine oil, and kerosene oil as a base fluids mixed with different concentrations of MWCNTs. The reliability and effectiveness of the design scheme is measured with the help of results of statistical analysis based on sufficient large number of independent runs of the algorithms rather than single successful run. The comparative studies of the proposed solution are made with standard numerical results in order to establish the correctness of the given scheme. 相似文献
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Jean-Marc TullianiAuthor Vitae Alessio CavalieriAuthor VitaeSimone MussoAuthor Vitae Eloisa SardellaAuthor VitaeFrancesco GeobaldoAuthor Vitae 《Sensors and actuators. B, Chemical》2011,152(2):144-154
In this work, different techniques are proposed to realize ammonia (NH3) sensors working at room temperature and a preliminary electrical characterization under water vapor and in NH3 atmospheres is presented. Three families of ceramic planar sensors based on a zinc oxide (ZnO) layer overlapped by screen-printed Pd-doped carboxyl groups functionalized multi-walled carbon nanotubes (Pd-COOH-MWCNTs) or by blocks of vertically aligned MWCNTs or by graphite as such and functionalized with fluorinated or nitrogenous functional groups were studied.These sensors were almost insensitive to humidity, while all of them gave a good response in NH3 atmosphere, starting from about 45 ppm in the case of zinc oxide with fluorinated or nitrogenous MWCNTs and graphite or 50 ppm for Pd-COOH-MWCNTs sensors. These results are not actually as good as those reported in the literature, but this preliminary work proposes simpler and cheaper processes to realize NH3 sensor for room temperature applications. 相似文献