共查询到17条相似文献,搜索用时 156 毫秒
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在研制成功的用于化学气体探测的热驱动微悬臂梁谐振器的基础上,提出了基于这种微悬臂梁谐振器,并以聚合物涂层作为挥发性有机化合物吸附敏感层的谐振式气体传感器.利用3种聚合物材料:聚氧化乙烯(PEO)、聚乙烯醇(PVA)和聚乙二醇乙醚醋酸酯(PEVA),在微悬臂梁谐振器上制备气体敏感层,探测6种挥发性有机化合物:甲苯、苯、乙醇、丙酮、己烷和辛烷.通过有限元分析估计了聚合物涂层的工作温度.用喷射法制备了PVA和PE-VA涂层,用点滴法制备了PEO涂层.测试了传感器的开环幅频特性,实验检测了气体传感器的谐振频率变化与分析物蒸气浓度的关系以及传感器对相对湿度的响应,分析了传感器的灵敏度和线性度.实验结果表明,这种涂覆聚合物敏感层的热驱动微悬臂梁谐振器为探测挥发性有机化合物提供了良好的平台.根据实验结果,可开发几种基于不同聚合物敏感层的高灵敏度微型气体传感器. 相似文献
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许高斌陈诚陈兴马渊明于永强张倩 《真空科学与技术学报》2019,(11):980-988
微谐振式压力传感器因其体积小、精度高等特点而被广泛研究,本文基于谐振器在不同压力载荷下侧向振动时其等效刚度随轴向应力的改变而变化的原理,设计了一种静电激励/电容检测的谐振式压力传感器。本设计采用的谐振器结构与现有研究不同,通过在谐振梁的两边设计了两根侧梁用于抑制谐振器的Z向位移,提高了传感器的稳定性,并且双面梳齿结构和复合温敏梁可进一步优化传感器检测灵敏度等性能。在ANSYS WORKBENCH仿真平台下对其进行分析与验证,结果表明:侧梁可有效地抑制谐振器的Z向位移,在0~100 MPa范围内谐振器具有良好的正向应力特性;传感器基础谐振频率为29.834 kHz,在0~120 kPa范围内灵敏度可达29.6Hz/kPa,且最大过压1.5×FS时仍具备频率稳定性,这表明该传感器可应用于对灵敏度、抗过压等性能有更高要求的复杂环境中。 相似文献
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微谐振式压力传感器因其体积小、精度高等特点而被广泛研究,本文基于谐振器在不同压力载荷下侧向振动时其等效刚度随轴向应力的改变而变化的原理,设计了一种静电激励/电容检测的谐振式压力传感器。本设计采用的谐振器结构与现有研究不同,通过在谐振梁的两边设计了两根侧梁用于抑制谐振器的Z向位移,提高了传感器的稳定性,并且双面梳齿结构和复合温敏梁可进一步优化传感器检测灵敏度等性能。在ANSYS WORKBENCH仿真平台下对其进行分析与验证,结果表明:侧梁可有效地抑制谐振器的Z向位移,在0~100 MPa范围内谐振器具有良好的正向应力特性;传感器基础谐振频率为29.834 kHz,在0~120 kPa范围内灵敏度可达29.6Hz/kPa,且最大过压1.5×FS时仍具备频率稳定性,这表明该传感器可应用于对灵敏度、抗过压等性能有更高要求的复杂环境中。 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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提出了一种用于远距离传感的无芯片RFID湿度传感器的设计.设计采用极化变换谐振器,用于减小周围环境对标签响应的影响,提高了传感器的可靠性.传感器标签集成了可实现极化变换的双螺旋条带和四组弯曲哑铃形条带,分别作为湿度传感谐振器和编码谐振器,能够在3.1 GHz~10.6 GHz的超宽带频率范围内产生5个谐振峰.传感谐振器... 相似文献
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The use of graphene for strain sensors has attracted enormous attention due to its prominent mechanical and electrical properties. In this paper, we report on the preparation and characterization of a novel type of strain sensor based on graphene composite films with layered configuration. Highly reliable and sensitive composite films strain sensors based on graphene were produced from solution processed graphene flakes by spray coating method. The layered strain sensor which could sustain a large tensile deformation (25% strain) demonstrated high sensitivity to mechanical strain with gauge factors of 6–35. And the sensitivity of this type of strain sensors can be tuned over a relatively wide range of values by adjusting the deposition parameters. What’s more, the layered composite films are more durable compared with the fragile pure graphene films. In addition the main mechanisms are investigated, resulting in theoretical models which predict very well the observed behavior. 相似文献
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In the last two decades, wearable piezoresistive physical sensors have attracted tremendous attention due to their broad applications in individual health-monitoring, human–machine interfaces, robotics, sports and therapeutics. Many different nanostructured materials, including nanowires, nanoparticles, nanoribbons, carbon black, carbon nanotubes and graphene, have been explored to construct stretchable piezoresistive sensors on an elastomer substrate. Thanks to its unique two-dimensional geometry, lightweight, flexibility, semi-transparency and outstanding transport and mechanical properties, graphene and its derivatives in particular are considered among the most suitable candidates as wearable sensors. This paper reviews various design strategies established for fabricating flexible, wearable sensors using graphene. The current state-of-the-art developments are discussed of flexible sensors made of 1D fibrous, 2D planar and 3D cellular interconnected graphene architectures for detecting physiological strains, tactile pressures and temperatures. The working mechanisms along with existing applications of flexible sensors are presented. The challenges these sensors are currently facing and potential opportunities for novel applications are revealed to offer new insights into future prospects in this field. 相似文献
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Graphene is a fascinating material of recent origin whose first isolation was being made possible through micromechanical cleavage of a graphite crystal. Owing to its fascinating properties, graphene has garnered significant attention in the research community for multiple applications. A number of methods have been employed for the synthesis of single-layer and multi-layer graphene. The extraordinary properties of graphene such as its Hall effect at room temperature, high surface area, tunable bandgap, high charge mobility and excellent electrical, conducting and thermal properties allow for the development of sensors of various types and also opened the doors for its use in nanoelectronics, supercapacitors and batteries. Biological aspects of graphene have also been investigated with particular emphasis on its toxicity and drug delivery. In this review, many of the salient aspects of graphene, such as from synthesis to its applications, primarily focusing on sensor applications which are of current interest, are covered. 相似文献
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Xiaoyan Zhang Qiushi Jing Shen Ao Grgory F. Schneider Dmitry Kireev Zhengjun Zhang Wangyang Fu 《Small (Weinheim an der Bergstrasse, Germany)》2020,16(15)
This review provides a critical overview of current developments on nanoelectronic biochemical sensors based on graphene. Composed of a single layer of conjugated carbon atoms, graphene has outstanding high carrier mobility and low intrinsic electrical noise, but a chemically inert surface. Surface functionalization is therefore crucial to unravel graphene sensitivity and selectivity for the detection of targeted analytes. To achieve optimal performance of graphene transistors for biochemical sensing, the tuning of the graphene surface properties via surface functionalization and passivation is highlighted, as well as the tuning of its electrical operation by utilizing multifrequency ambipolar configuration and a high frequency measurement scheme to overcome the Debye screening to achieve low noise and highly sensitive detection. Potential applications and prospectives of ultrasensitive graphene electronic biochemical sensors ranging from environmental monitoring and food safety, healthcare and medical diagnosis, to life science research, are presented as well. 相似文献
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Congcong Zhang Pei Miao Mingyuan Sun Mei Yan Hong Liu 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(38)
MicroRNAs (miRNAs) are short, endogenous, noncoding RNAs that play critical roles in physiologic and pathologic processes and are vital biomarkers for several disease diagnostics and therapeutics. Therefore, rapid, low‐cost, sensitive, and selective detection of miRNAs is of paramount importance and has aroused increasing attention in the field of medical research. Among the various reported miRNA sensors, devices based on graphene and its derivatives, which form functional supramolecular nanoassemblies of π‐conjugated molecules, have been revealed to have great potential due to their extraordinary electrical, chemical, optical, mechanical, and structural properties. This Review critically and comprehensively summarizes the recent progress in miRNA detection based on graphene and its derivative materials, with an emphasis on i) the underlying working principles of these types of sensors, and the unique roles and advantages of graphene materials; ii) state‐of‐the‐art protocols recently developed for high‐performance miRNA sensing, including representative examples; and iii) perspectives and current challenges for graphene sensors. This Review intends to provide readers with a deep understanding of the design and future of miRNA detection devices. 相似文献
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Fibrous materials usually have good mechanical, heat-resistant, acid-resistant, alkali-resistant and moisture regained properties which originate from its composition, condensed structure and crosslinking styles. However, these materials often lack of good electrical conductivity, flame retardance, anti-static and anti-radiation properties which are desired for varied specific applications. Graphene, as a new emerging nanocarbon material, has some unique properties including superb thermal and electrical conductivity, strong mechanical and anti-corrosive property, extremely high surface area etc. Therefore, graphene has attracted extensive interests in recent years. Upon modification with graphene, fibers exhibit a number of enhanced or new properties such as adsorption performance, anti-bacteria, hydrophobicity and conductivity which are beneficial for broader applications. In this review, the strategies to modify the fibers with graphene and the corresponding effects on the fibers as well as the relevant applications in varied areas were discussed. 相似文献