Preparation of g-C₃N₄/Graphene Composite for Detecting NO₂ at Room Temperature.
Graphitic carbon nitride (g-C₃N₄) nanosheets were exfoliated from bulk g-C₃N₄ and utilized to improve the sensing performance of a pure graphene sensor for the first time. The role of hydrochloric acid treatment on the exfoliation result was carefully examined. The exfoliated products were characterized by X-ray diffraction (XRD) patterns, scanning electron microscopy (SEM), atomic force microscopy (AFM), and UV-Vis spectroscopy. The exfoliated g-C₃N₄ nanosheets exhibited a uniform thickness of about 3-5 nm and a lateral size of about 1-2 µm. A g-C₃N₄/graphene nanocomposite was prepared via a self-assembly process and was demonstrated to be a promising sensing material for detecting nitrogen dioxide gas at room temperature. The nanocomposite sensor exhibited better recovery as well as two-times the response compared to pure graphene sensor. The detailed sensing mechanism was then proposed.
Department of Physics, Dongguk University, Seoul 04620, Korea. slzhang@dongguk.edu.
Shaolin
S
Zhang
Department of Physics, Dongguk University, Seoul 04620, Korea. thuyhang.clc@gmail.com.
Nguyen Thuy
NT
Hang
Department of Physics, Dongguk University, Seoul 04620, Korea. zjzhang@dongguk.edu.
Zhijun
Z
Zhang
School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China. hyyue@163.com.
Hongyan
H
Yue
Department of Physics, Dongguk University, Seoul 04620, Korea. wyang@dongguk.edu.
Woochul
W
Yang
composite; g-C3N4; gas sensor; graphene; room temperature