کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1414995 985922 2012 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Highly responsive hydrogen gas sensing by partially reduced graphite oxide thin films at room temperature
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی (عمومی)
پیش نمایش صفحه اول مقاله
Highly responsive hydrogen gas sensing by partially reduced graphite oxide thin films at room temperature
چکیده انگلیسی

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 cm3/min (sccm) under 10 Torr partial pressure. The rGOs treated at 70 °C in atmosphere (rGO070a), 200 °C in a vacuum (rGO200v), and 500 °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 (∼4.5%), response time (∼20 s), and recovery time (∼10 s) to 160 ppm hydrogen gas at room temperature.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbon - Volume 50, Issue 11, September 2012, Pages 4061–4067
نویسندگان
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