Preparation of g-C3N4/graphene composite for detecting NO2 at room temperature

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Abstract

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.

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Zhang, S., Hang, N. T., Zhang, Z., Yue, H., & Yang, W. (2017). Preparation of g-C3N4/graphene composite for detecting NO2 at room temperature. Nanomaterials, 7(1). https://doi.org/10.3390/nano7010012

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