STM-electroluminescence from clustered C3N4 nanodomains synthesized via green chemistry process

被引：4

作者：

Andrade, E. P. ^{[1
]}

Costa, B. B. A. ^{[1
]}

Chaves, C. R. ^{[2
]}

de Paula, A. M. ^{[1
]}

Cury, L. A. ^{[1
]}

Malachias, A. ^{[1
]}

Safar, G. A. M. ^{[1
]}

机构：

[1] Univ Fed Minas Gerais, Dept Fis, Inst Ciencias Exatas, BR-31270901 Belo Horizonte, MG, Brazil

[2] Univ Fed Bahia, Dept Biointeracao, Inst Ciencias Saude, BR-40110100 Salvador, BA, Brazil

来源：

ULTRASONICS SONOCHEMISTRY | 2018年 / 40卷

关键词：

STM-electroluminescence; Graphitic carbon nitride; Green process; X-ray diffraction; STM/STS; Sonication; GRAPHITIC CARBON NITRIDE; FUNCTIONALIZED SILICA; OPTICAL-PROPERTIES; PLANAR STRUCTURES; PHASE; NANOPARTICLES; MELAMINE; UROLITHIASIS; ULTRASOUND; SONICATION;

D O I：

10.1016/j.ultsonch.2017.08.021

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

A Scanning Tunneling Microscopy/Spectroscopy (STM/STS) and synchrotron X-ray diffraction study on clustered C3N4 nanoparticles (nanoflakes) is conducted on green-chemistry synthesized samples obtained from chitosan through high power sonication. Morphological aspects and the electronic characteristics are investigated. 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 C3N4. A high density of defects is inferred from the XRD measurements. Additionally, STM-electroluminescence (STMEL) is detected in C3N4 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.

引用

页码：742 / 747

页数：6

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