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Type: Journal article
Title: Metal-doped graphitic carbon nitride (g-C₃N₄) as selective NO₂ sensors: a first-principles study
Other Titles: Metal-doped graphitic carbon nitride (g-C(3)N(4)) as selective NO(2) sensors: a first-principles study
Author: Zhang, H.
Du, A.
Gandhi, N.
Jiao, Y.
Zhang, Y.
Lin, X.
Lu, X.
Tang, Y.
Citation: Applied Surface Science, 2018; 455:1116-1122
Publisher: Elsevier
Issue Date: 2018
ISSN: 0169-4332
Statement of
Hong-ping Zhang, Aijun Du, Neha S. Gandhi, Yan Jiao, Yaping Zhang, Xiaoyan Lin, Xiong Lu, Youhong Tang
Abstract: In this research, the potential application of metal-doped g-C₃N₄ as highly sensitive molecule sensors for NO₂ detection was studied using density function theory (DFT) calculations. Various metal-doped (Ag-, Au-, Co-, Cr-, Cu-, Fe-, K-, Li-, Na-, Mn-, Pt-, Pd-, Ti-, V-) g-C₃N₄ sheets were considered. CO, CO₂, NH₃, N₂ and NO₂ molecules were found to adsorb on metal-doped g-C₃N₄ via strong chemical bonds. Chemisorbed gas molecules and metal-doped g-C₃N₄ formed charge transfer complexes with different charges transferring from metal-doped g-C₃N₄ to gas molecules. Pristine and metal-doped g-C₃N₄ sheets were demonstrated as potential capturers for certain gas molecules according to the adsorption energy, isosurface of electron density difference, and density of states analysis. Among the diverse metal-doped g-C₃N₄ sheets, Ag-, K-, Na-, and Li-doped g-C₃N₄ were found to be clearly sensitive to the NO₂ molecule. The adsorption energies between NO₂ and Ag-, K-, Na-, and Li-doped g-C₂N4 were significantly greater than those of the other gas molecules (CO, CO₂, N₂, and NH₃). The density of states indicates that the NO₂ adsorption on Ag-, K-, Na-, and Li-doped g-C₃N₄ induced the shift of the total density of state in the positive energy direction. Charge transfer results also demonstrate that chemical interactions existed between NO₂ and Ag-, K-, Na-, and Li-doped g-C₃N₄. All these results suggest the strong potential of Ag-, K-, Na-, and Li-doped g-C₃N₄ for application as highly sensitive molecule sensors.
Keywords: g-C₃N₄; metal-doped; NO₂; sensitive; density functional theory
Rights: © 2018 Elsevier B.V. All rights reserved.
RMID: 0030090772
DOI: 10.1016/j.apsusc.2018.06.034
Appears in Collections:Chemical Engineering publications

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