Synthesis of gas sensor technology

Being a part of environment, gases are directly linked with human life and their odors tremendously influence the images of environment. The human nose serves as a highly sensing instrument, which is able to differentiate between hundreds of smells, but fails to detect the absolute gas concentrations or odorless gases. Therefore, it is necessary to develop artificial sensing device to support human nose. Support is desired in safety applications where combustible or toxic gases are present and comfort applications such as climate controls of building and vehicles where good quality air is required. Accordingly, gas monitoring is needed in process control and laboratory analytics. The development of gas sensors to monitor toxic and combustible gases is imperative for environmental pollution and safety requirements for the industries. In general, sensor provides an interface between the electronic equipment and the physical world typically be converting nonelectrical physical or chemical quantities into electrical signals.