Hydrogen sensing characteristics of carbon-nanotube sheet decorated with manganese oxides

A hybrid composite Multi-Walled Carbon Nanotube (MWCNT) sheet decorated with a manganese oxide (MnOx) gas sensor was developed for the detection of hydrogen (H2) gas; electrical resistance increases linearly with H2 exposure. The MnOx particles were coated uniformly on the MWCNT sheets by electrodeposition, which is simple and controllable for fabricating binary or hierarchical composites. The sensitivity of the sensor was affected by the mean size of the MnOx particles, which in turn were controlled by the electrodeposition time. The measured output characteristics were quite stable, reliable and reproducible.