Carbon Nanotube‐Based Chemical Sensors

Abstract

The need to sense gases and vapors arises in numerous scenarios in industrial, environmental, security and medical applications. Traditionally, this activity has utilized bulky instruments to obtain both qualitative and quantitative information on the constituents of the gas mixture. It is ideal to use sensors for this purpose since they are smaller in size and less expensive; however, their performance in the field must match that of established analytical instruments in order to gain acceptance. In this regard, nanomaterials as sensing media offer advantages in sensitivity, preparation of chip-based sensors and construction of electronic nose for selective detection of analytes of interest. This article provides a review of the use of carbon nanotubes in gas and vapor sensing.

Investigation of Pristine Graphite Oxide as Room-Temperature Chemiresistive Ammonia Gas Sensing Material

“…It is worth noting that the contact with ammonia either in wet air or in dry air does not change the sensing mechanism of GO, which is based on a hole depletion mechanism [19,36,37], where GO can be treated as a p-type semiconductor and the absorption of an electron-donating compound such as NH 3 leads to the increase of sensor resistance. The desorption of chemically adsorbed ammonia which will make the sensor reusable can be performed using thermal heating [38], infrared light irradiation [39], etc.…”

The Energy Consumed by Electrochemical Molecular Machines as Self‐Sensor of the Reaction Conditions: Origin of Sensing Nervous Pulses and Asymmetry in Biological Functions

“…Alternatively conducting polymers, carbon nanotubes, graphenes and other carbonaceous materials have been profusely used during the last decades as non‐reactive electrodic supports for the construction of chemical, electrochemical and biochemical sensors ,,,. From a sensing point of view we are facing here a new paradigm these electrodic materials can be used as reactants (Reaction 1).…”

Carbon Nanotube-Based Chemiresistive Sensors

“…The conductance changes between two electrodes are measured to investigate the sensing response. There have been some reviews concerning carbon nanotube-based sensors [2,3,4,5,6,7,8]. This review also mainly focuses on carbon nanotube-based chemiresistive sensors.…”