共查询到17条相似文献,搜索用时 906 毫秒
1.
丙酮是一种具有毒性、易挥发性以及易燃性的有机化工原料,会对人们的身体健康造成危害。在特定环境中,丙酮的含量可以通过气体传感器进行快速检测。详细介绍了金属氧化物基丙酮气体传感器的工作机理,并对以ZnO、WO3、Co3O4、SnO2四种金属氧化物为基质的半导体型气体传感器在丙酮检测方面的研究进展进行了综述,重点总结了其微观形貌、金属掺杂及复合对传感器选择性和灵敏度的影响,并对现阶段研究中可能存在的问题以及未来可能的研究方向进行了简单概述。这将有助于提高金属氧化物基丙酮气体传感器的性能,为环境监测和工业安全领域提供更可靠、更高效的丙酮检测手段。 相似文献
2.
气敏传感器在现代工农业、信息技术、环境监测等领域都有重要应用。随着这几个领域的发展,人类对其综合性能要求越来越强,进而不断积极改良气敏传感器的性能。金属氧化物气敏元件是利用金属氧化物半导体的表面电阻遇到被测气体发生变化的原理制成的电子器件,其选择性和稳定性是研究气敏元件的两项重要指标。文章概述了金属氧化物元件气敏特性的研究进展,介绍了基体材料、掺杂材料、气敏材料的制备工艺、电极材料及结构等几个因素对元件气敏特性的主要影响,并对各种因素的作用机理进行了分析。最后展望了金属氧化物气敏元件的发展前景。 相似文献
3.
4.
5.
6.
7.
8.
为了监测空气环境,针对煤炭不完全燃烧产生的一氧化碳有害气体,提出一种无线传感器网络(WSN)-氧化碳远程监测节点的设计方案.设计了以低功耗片上系统型微处理器C8051F930为控制器,采用金属氧化物半导体在加热条件下和一氧化碳发生氧化还原反应时电阻值随气体浓度变化而变化为检测原理的一氧化碳传感器TGS2442对气体传感信号采集、调理、转换、数据处理,通过支持802.15.4通信协议的无线射频芯片Si4432收发数据,实 现了对一氧化碳排放情况的远程监控. 相似文献
9.
10.
本文介绍了直热式钛泵作为消气剂和调整氢气压力源在金属陶瓷脉冲氢闸流管中的应用。并且采用四极质谱仪定量分析了钛泵对管内残余气体的吸收能力。指出使用钛泵作为消气剂和调整氢气压力源的闸流管,具有着火快、起动时间短、工作范围宽、寿命长的特点。目前国内外尚未报道过直热式钛泵作为消气剂和调整气压源应用在金属陶瓷氢闸流管上的消息。这是因为氢闸流管中充有氢气,氢气是活泼气体,它能与许多消气剂发生作用,因 相似文献
11.
12.
Low power consuming and highly responsive semiconductor‐type microelectromechanical systems (MEMS) gas sensors are fabricated for real‐time environmental monitoring applications. This subsystem is developed using a gas sensor module, a Bluetooth module, and a personal digital assistant (PDA) phone. The gas sensor module consists of a NO2 or CO gas sensor and signal processing chips. The MEMS gas sensor is composed of a microheater, a sensing electrode, and sensing material. Metal oxide nanopowder is drop‐coated onto a substrate using a microheater and integrated into the gas sensor module. The change in resistance of the metal oxide nanopowder from exposure to oxidizing or deoxidizing gases is utilized as the principle mechanism of this gas sensor operation. The variation detected in the gas sensor module is transferred to the PDA phone by way of the Bluetooth module. 相似文献
13.
14.
15.
Diogo P. Volanti Anderson A. Felix Marcelo O. Orlandi George Whitfield Dae‐Jin Yang Elson Longo Harry L. Tuller José A. Varela 《Advanced functional materials》2013,23(14):1759-1766
The development of gas sensors with innovative designs and advanced functional materials has attracted considerable scientific interest given their potential for addressing important technological challenges. This work presents new insight towards the development of high‐performance p‐type semiconductor gas sensors. Gas sensor test devices, based on copper (II) oxide (CuO) with innovative and unique designs (urchin‐like, fiber‐like, and nanorods), are prepared by a microwave‐assisted synthesis method. The crystalline composition, surface area, porosity, and morphological characteristics are studied by X‐ray powder diffraction, nitrogen adsorption isotherms, field‐emission scanning electron microscopy and high‐resolution transmission electron microscopy. Gas sensor measurements, performed simultaneously on multiple samples, show that morphology can have a substantial influence on gas sensor performance. An assembly of urchin‐like structures is found to be most effective for hydrogen detection in the range of parts‐per‐million at 200 °C with 300‐fold larger response than the previously best reported values for semiconducting CuO hydrogen gas sensors. These results show that morphology plays an important role in the gas sensing performance of CuO and can be effectively applied in the further development of gas sensors based on p‐type semiconductors. 相似文献
16.
17.