BigPatents India

Conventional methods of making Carbon nanotubes (CNT) almost invariably suffer from presence of impurities like amorphous carbon, metal catalysts and many carbonaceous particles, which necessitated further purification adding to the cost of production of sensors, apart from the lack of quality control. The present invention aims at overcoming the foregoing difficulties and provides a process for producing sensors based on CNT and CNF for detecting traces of gases like CH4, CO, SO2, NO, NO2, etc., which comprises conducting of around 2730K –3500K with Si (001) wafers attached to copper cathode and graphite as anode. The electrodes are kept 6-10 mm apart and the voltage applied is between 15 and 26V and the electrolytic deposition is carried out for a period of around 10-20 hours. This invention also encompasses a device using the sensors made by the above process which works under ambient condition and can use battery as a power source. (FIG.7).