Abstract
This thesis is divided into three parts. Porous thin films of multi-walled carbon nanotubes/lithium chloride/polyacrylonitrile are made and tested as sensors of humidity and experiments include the transmittance and reflectivity changes at visible light and water vapor permeability. In the 1st part, results show an improved sensitivity and accuracy compared with conventional devices made of porous polyacrylonitrile alone. In the 2nd part, the transmittance and reflectivity of porous polyacrylonitrile thin films at visible regime are verified to be 50~60% changes between dry and wetted states. In the 3th part, experimental results show the greater the pore volume of polyacrylonitrile films the better the water vapor permeability.