Chemically modified discriminating gas sensors

化学改性辨别气体传感器

• 批准号: EP/E021514/1
• 负责人: Ivan Parkin
• 金额: $ 51.94万
• 依托单位: University College London
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2006
• 资助国家: 英国
• 起止时间: 2006 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FE021514%2F1
• 关键词: Chemically; modified; discriminating; gas; sensors

Metal oxide gas sensors are small devices - 2 mm x 2mm that are used to detect trace gases in air. They are widely used in cars (exhausts and air intake vents), in weather balloons, in environmental monitoring (land fill sites) and in ozone detection. They work by showing a change in electrical resistance when exposed to a gas. The problem with these sensors is that they can't distinguish very well, if at all, mixtures of different gasses - for example ammonia and methane both give a change in resistance to the sensor. For these sensors to find wide spread application they need to be able to sense a specific target gas in the presence of a complex gas mixture. To date this has not been acheived. This proposal will generate a new type of sensor that has an additional discriminating sensor layer either on top of the traditional metal oxide or embedded within the metal oxide. This new layer contains a material called a zeolite- essentially a very porous solid that can let certain types of gases permeate through the structure. The zeolite gives enhanced sensitivity and sieves gas molecules on the basis of their size, shape and chemical composition. These zeolite layers will give us enhanced sensitivity and most importantly selectivity. By combining different types of zeolites we are able to make an array of sensors that can function as well as or better than the human nose. Specific problems that can be addressed include:1 Detection of contaiminated water, foodstuffs, chemicals and perfumes.2 A single breath detector that can analyse for a range of diseases and for alcohol/ drug content.3 Environmental monitoring (land fill, waste dump. brown field sites).

金属氧化物气体传感器是小型设备-2 mm x 2mm，用于检测空气中的痕量气体。它们被广泛用于汽车（排气和进气口），天气气球，环境监测（土地填充地点）和臭氧检测中。它们通过暴露于气体时显示电阻的变化来起作用。这些传感器的问题在于它们无法很好地区分不同的气体混合物 - 例如氨和甲烷都会改变对传感器的抗性。要使这些传感器找到广泛的扩散应用，他们需要能够在存在复杂气体混合物的情况下感知特定的目标气体。迄今为止，这还没有实现。该提案将生成一种新型的传感器，该传感器在传统的金属氧化物顶部或嵌入金属氧化物中具有额外的区分传感器层。该新层包含一种称为沸石的材料 - 本质上是一种非常多孔的固体，可以使某些类型的气体渗透到结构中。沸石具有增强的敏感性，并根据其大小，形状和化学成分筛分气体分子。这些沸石层将使我们增强灵敏度，最重要的是选择性。通过结合不同类型的沸石，我们能够制造出一系列可以比人鼻子起作用或更好的传感器。可以解决的特定问题包括：1检测受到的水，食物，化学物质和香水的检测。2单个呼吸探测器可以分析各种疾病和酒精/药物含量。3环境监测（土地填充，废物垃圾场，棕色田地。棕色田地）。

项目成果

Gas Sensing Properties of Composite Tungsten Trioxide-Zeolite Thick Films

• DOI: 10.1149/1.3109634
• 发表时间: 2009-03
• 作者: A. Afonja;S. Dungey;R. Binions;I. Parkin;D. Lewis;David J. Williams

The use of time resolved aerosol assisted chemical vapour deposition in mapping metal oxide thin film growth and fine tuning functional properties

• DOI: 10.1039/c4ta05922k
• 发表时间: 2015-02
• 期刊: Journal of Materials Chemistry
• 作者: N. Chadwick;S. Sathasivam;Salem M Bawaked;M. Mokhtar;S. Al‐Thabaiti;S. Basahel;I. Parkin;C. Carmalt

Zeolite-Modified Discriminating Gas Sensors

• DOI: 10.1149/1.3065436
• 发表时间: 2009-01-01
• 期刊: JOURNAL OF THE ELECTROCHEMICAL SOCIETY
• 影响因子: 3.9
• 作者: Binions, Russell;Davies, Helen;Parkin, Ivan P.
• 通讯作者: Parkin, Ivan P.

Discrimination Effects in Zeolite Modified Metal Oxide Semiconductor Gas Sensors

• DOI: 10.1109/jsen.2010.2084079
• 发表时间: 2011-05-01
• 期刊: IEEE SENSORS JOURNAL
• 影响因子: 4.3
• 作者: Binions, Russell;Afonja, Ayo;Williams, David E.
• 通讯作者: Williams, David E.