1D oxide semiconductors nanocrystals are considered to be highly efficient source for gas sensing due to their high sensitivity to surface chemical reaction, rapid response and high surface to volume ratios in comparison to thin film gas sensors. The effects of Mg doping on the structural, optical, morphological and gas sensing properties of ZnO nanobelts were investigated in this chapter. Toxic gases can affect human life and health even at levels of few parts per million and therefore, highly sensitive gas sensors are required. Since CO gas is tasteless, odorless and toxic and as such may not be easily detected by humans. Therefore, it is essential to develop a sensitive CO gas sensor to protect humans exposure to CO gas.

Muhammad Amin received the M.Sc degree in Physics from Punjab University, Lahore, Pakistan in 1996, MS and PhD degrees in Physics from COMSATS University of information Technology, Islamabad, Pakistan in 2010 and 2014. He is currently working as a researcher in a scientific and technical organization of Pakistan.