Development of electronic nose based on ZnO nanowires for toxic gas detection

An electronic nose based on ZnO nanowires (NWs) for toxic gas detection has been demonstrated. In order to realize the multiple sensor array the ZnO NW film was selectively modified with Al, Ti, and Au layer resulting in an array of 4 × 3 sensor films. Data repository was prepared using an indigenously developed data acquisition system, testing chamber and a Labview based program. The data bank is generated by recording the response curve of the sensor array towards NO ₂ , NO and H ₂ S as a function of gas concentration. A simple bar chart is used to identify the target gas. It indicates a unique signature pattern for the gases under investigation.