Fig. 3From: A Highly Sensitive and Room Temperature CNTs/SnO2/CuO Sensor for H2S Gas Sensing ApplicationsFESEM images of a pristine carbon nanotubes; b, c carbon nanotubes with oxidation treatment; d, e CNTs/SnO2 nanocomposite; and f CNTs/SnO2/CuO nanocomposite filmBack to article page