High Performance Carbon Monoxide Sensor Based on Nano Composite of SnO₂-Graphene

Abstract

SnO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> -graphene nanocomposite thick films have been successfully synthesized using polyol method. Reflux with ethylene glycol as medium was employed to produce the nanocomposite. Crystal structure characterization using X-Ray diffraction shows the nanocomposites have good crystalinity without any impurity. Scanning electron microscopy and transmission electron microscopy characterization results show SnO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> has spherical shape and well distributed on the graphene layer. The size of SnO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> particles is around 5-8 nm. To confirm the improvement effect of grapheme addition to SnO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> , sensor testing was conducted toward 30 ppm carbon monoxide (CO) gas at 150 °C compared with pure SnO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> and pure graphene. The sensor responses are 88.11%, 52.84%, and 0.93%, respectively.