Highly responsive hydrogen gas sensing by partially reduced graphite oxide thin films at room temperature

作者：Wang Jianwei; Kwak Youngreal; Lee In yeal; Maeng Sunglyul; Kim Gil Ho^*

来源：Carbon, 2012, 50(11): 4061-4067.

DOI：10.1016/j.carbon.2012.04.053

Novel chemo-resistive gas sensors based on reduced graphite oxide (rGO) thin films have been fabricated and evaluated for hydrogen detection. The rGO materials were thermally treated at various conditions and analyzed using X-ray diffraction, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy techniques to investigate the change of functional groups. The semiconductor type of the rGOs treated at different conditions were checked by flowing hydrogen gas at 20 cm(3)/min (sccm) under 10 Ton partial pressure. The rGOs treated at 70 degrees C in atmosphere (rGO070a), 200 degrees C in a vacuum (rGO200v), and 500 degrees C in a vacuum (rGO500v) exhibited n-type, ambipolar, and p-type behavior, respectively. The rGO500v was adopted as active sensing element without any rare metal decoration, and its sensing response to hydrogen was studied by using air as carrier gas. The rGO500v exhibited good sensitivity (similar to 4.5%), response time (similar to 20 s), and recovery time (similar to 10 s) to 160 ppm hydrogen gas at room temperature.

• 出版日期2012-9