STM-electroluminescence from clustered C3N4 nanodomains synthesized via green chemistry process
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Universidade Federal de Minas Gerais
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Artigo de periódico
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Resumo
A Scanning Tunneling Microscopy/Spectroscopy (STM/STS) and synchrotron X-ray diffraction study on clus-
tered C3N 4 nanoparticles (nanoflakes) is conducted on green-chemistry synthesized samples obtained from
chitosan through high power sonication. Morphological aspects and the electronic characteristics are in-
vestigated. The observed bandgap of the nanoflakes reveals the presence of different phases in the material.
Combining STM morphology, STS spectra and X-ray diffraction (XRD) results one finds that the most abundant
phase is graphitic C3 N4. A high density of defects is inferred from the XRD measurements. Additionally, STM-
electroluminescence (STMEL) is detected in C3 N4 nanoflakes deposited on a gold substrate. The tunneling
current creates photons that are three times more energetic than the tunneling electrons of the STM sample. We
ponder about the two most probable models to explain the observed photon emission energy: either a nonlinear
optical phenomenon or a localized state emission.
Abstract
Assunto
Eletroluminescência, Difração, Raios X, Scanning tunneling microscopy, Química verde
Palavras-chave
STM-electroluminescence, Graphitic carbon nitride, Green process, X-ray diffraction, STM/STS, Sonication
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Endereço externo
https://www.sciencedirect.com/science/article/pii/S1350417717303759?via%3Dihub