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http://hdl.handle.net/1843/60301| Type: | Artigo de Periódico |
| Title: | STM-electroluminescence from clustered C3N4 nanodomains synthesized via green chemistry process |
| Authors: | Everton Pereira de Andrade Barbara Brenda de Almeida Costa C. R. Chaves Ana Maria de Paula Luiz Alberto Cury Ângelo Malachias de Souza Gustavo de Almeida Magalhães Sáfar |
| Abstract: | 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. |
| Subject: | Eletroluminescência Difração Raios X Scanning tunneling microscopy Química verde |
| language: | eng |
| metadata.dc.publisher.country: | Brasil |
| Publisher: | Universidade Federal de Minas Gerais |
| Publisher Initials: | UFMG |
| metadata.dc.publisher.department: | ICX - DEPARTAMENTO DE FÍSICA |
| Rights: | Acesso Restrito |
| metadata.dc.identifier.doi: | https://doi.org/10.1016/j.ultsonch.2017.08.021 |
| URI: | http://hdl.handle.net/1843/60301 |
| Issue Date: | 2018 |
| metadata.dc.url.externa: | https://www.sciencedirect.com/science/article/pii/S1350417717303759?via%3Dihub |
| metadata.dc.relation.ispartof: | Ultrasonics Sonochemistry |
| Appears in Collections: | Artigo de Periódico |
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