Comprehensive Review of Latest e-Nose Sensor Technologies

Sensor technology is a rapidly developing field and the ubiquitous nature of a sensor in present-day today's life is evidently observed by one and all. Even so, fabricating a chemical sensor that can detect and distinguish multiple gas vapors in a harsh environment is a big challenge. Many commercially available gas sensors have various inbuilt disadvantages and can rarely be used whenever the detection of multiple toxins in the air is absolutely necessary. The solution to this problem, therefore, lies in integrating experimental sensing by devices to library pattern recognition systems. The subsequent sensor is called an electronic nose or e-Nose and it displays an array of sensors with different sensitive coatings for sensing multiple analytes. The present research paper focuses on a comprehensive review of the design and development of the latest e-Nose sensor technologies from 1994 onwards with special reference to detection and identification of the minimal amount of toxic agents / chemical warfare agents in a complex dynamic environment with their advantages and disadvantages.