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介绍了将LIGA技术及其与牺牲层技术相结合 ,制造可动微结构的工艺方法。并给出了可实现摆动、转动的可动微结构———微执行器、微传感器和三维加速度传感器的制造过程等应用实例 相似文献
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Polymer-based materials can be incorporated as the active sensing elements in chemiresistor devices. Most of these devices take advantage of the fact that certain polymers will swell when exposed to gaseous analytes. To measure this response, a conducting material such as carbon black is incorporated within the nonconducting polymer matrix. In response to analytes, polymer swelling results in a measurable change in the conductivity of the polymer/carbon composite material. Arrays of these sensors may be used in conjunction with pattern recognition techniques for purposes of analyte recognition and quantification. We have used the technique of scanning force microscopy (SFM) to investigate microstructural changes in carbon-polymer composites formed from the polymers poly (isobutylene) (PIB), poly (vinyl alcohol) (PVA), and poly (ethylene-vinyl acetate) (PEVA) when exposed to the analytes hexane, toluene, water, ethanol, and acetone. Using phase-contrast imaging (PI), changes in the carbon nanoparticle distribution on the surface of the polymer matrix are measured as the polymers are exposed to the analytes in vapor phase. In some but not all cases, the changes were reversible (at the scale of the SFM measurements) upon removal of the analyte vapor. In this paper, we also describe a new type of microsensor based on piezoresistive microcantilever technology. With these new devices, polymeric volume changes accompanying exposure to analyte vapor are measured directly by a piezoresistive microcantilever in direct contact with the polymer. These devices may offer a number of advantages over standard chemiresistor-based sensors. 相似文献
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设计并制备了一种无透气膜的安培型氨气微传感器,并构建了氨氮检测系统,该系统实现了将溶液中的氨氮转化为氨气,并应用所设计的微传感器检测气态氨氮.采用MEMS工艺制备组成该微传感器的微电极芯片,氨敏感材料选用铂黑,通过电化学方法修饰于微电极表面.在微电极芯片的SU-8微池中滴入微量LiCl溶液,形成可使氨气迅速扩散到电极表面的薄层电解液.使用自行设计的氨氮检测系统对不同浓度氨氮样品进行检测,对微传感器的时间响应特性、线性度、灵敏度及重复性进行了测试和分析.微传感器的线性范围为0.2mg/L~4mg/L,线性相关系数为0.9847,检测下限为0.2mg/L,达到90%响应信号所需的时间在3min以内.结果表明,使用安培型氨气微传感器检测氨氮的方法是可行的. 相似文献
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对几种典型的谐振式加速度微传感器和微陀螺的结构、工作原理等方面进行了概述,分析了各自的应用特点。从中反映出谐振式微惯性传感器具有优良的特性,必有广阔的应用和发展前景。 相似文献
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Most acrylic acid-based superabsorbent hydrogels, which have been widely used in many applications, are crosslinked with water-solvable crosslinker N,N-methylenebisacrylamide (NMBA), which is easy to hydrolyze when radiated by ultraviolet, leading to decomposition of the superabsorbent hydrogels. In this article, ultraviolet-induced decomposition of acrylic acid-based superabsorbent hydrogels crosslinked with NMBA was investigated by weight loss method under ultraviolet radiation. The results showed that the decomposition rate of the superabsorbent hydrogels was controlled by ultraviolet-induced activation of amide groups on the networks when the intensity of ultraviolet radiation was low, whereas it was controlled by hydrolysis of amide groups on NMBA molecules when the intensity of ultraviolet radiation was high. The ultraviolet stability of acrylicacid-based superabsorbent hydrogels crosslinked with NMBA can be improved by increasing the neutralization degree of acrylic acid, increasing the dosage of crosslinker NMBA, or introducing acrylamide as comonomer. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 相似文献
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