The Chemical And Gas Sensors

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There has been a rapid growth in the field of biosensing through both ultrasensitive chemical and gas sensors. The bio-sensing protocols that are able to detect specific biological and chemical species, sensitively and specifically (selectively) can noticeably influence our daily lives. The issues related to monitoring of industrial emissions, medical diagnosis and public security are significant application fields of gas sensing in particular. Nano-engineered materials including Carbon Nanotubes and Graphene are being used to develop miniaturized sensors that can detect very low concentrations of gases which are biomarkers of certain diseases like lung cancer in particular. The composition of exhaled breath contains valuable information about certain volatile and semi-volatile compounds which can be used to generate a chemical “fingerprint” and thereby screen patients with lung cancer. Graphene and Carbon Nanotubes have been discussed for the development of chemical sensing platform.
A. Graphene for biosensing:
Graphene is a 2-D form of carbon with planar structure and sp2 bonding. It is a single layer of graphite with inter-planar spacings of 3.35 A0. It has attracted tremendous interest due to its exceptional and unique properties. Some of its properties that are relevant to its widespread use in gas sensors have been discussed below.
1. The high specific surface area of graphene (both suspended and supported on substrate) provide increased

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