Current Applied Physics

Korean Physical Society (한국물리학회)
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Mechanistic investigations on emission characteristics from g-C3N4, gC3N4@Pt and g-C3N4@Ag nanostructures using X-ray absorption spectroscopy

  • Sharma, Aditya (Advanced Analysis Centre, Korea Institute of Science and Technology (KIST)) ;
  • Varshney, Mayora (Advanced Analysis Centre, Korea Institute of Science and Technology (KIST)) ;
  • Chae, Keun Hwa (Advanced Analysis Centre, Korea Institute of Science and Technology (KIST)) ;
  • Won, Sung Ok (Advanced Analysis Centre, Korea Institute of Science and Technology (KIST))
  • Received : 2018.06.03
  • Accepted : 2018.08.30
  • Published : 2018.11.30
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Abstract

An improved method for the preparation of g-$C_3N_4$ is described. Currently, heating (> $400^{\circ}C$) of urea is the common method used for preparing the g-$C_3N_4$. We have found that sonication of melamine in $HNO_3$ solution, followed by washing with anhydrous ethanol, not only reduce the crystallite size of g-$C_3N_4$ but also facilitate intriguing electronic structure and photoluminescence (PL) properties. Moreover, loading of metal (Pt and Ag) nanoparticles, by applying the borohydride reduction method, has resulted in multicolor-emission from g-$C_3N_4$. With the help of PL spectra and local electronic structure study, at C K-edge, N K-edge, Pt L-edge and Ag K-edge by X-ray absorption spectroscopy (XAS), a precise mechanism of tunable luminescence is established. The PL mechanism ascribes the amendments in the transitions, via defect and/or metal states assimilation, between the ${\pi}^*$ states of tris-triazine ring of g-$C_3N_4$ and lone pair states of nitride. It is evidenced that interaction between the C/N 2p and metal 4d/5d orbitals of Ag/Pt has manifested a net detraction in the ${\delta}^*{\rightarrow}LP$ transitions and enhancement in the ${\pi}^*{\rightarrow}LP$ and ${\pi}^*{\rightarrow}{\pi}$ transitions, leading to broad PL spectra from g-$C_3N_4$ organic semiconductor compound.

Keywords

Acknowledgement

Supported by : Korea Institute of Science and Technology, Seoul, Korea (KIST)

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