sp2/sp3 bonding ratio dependence of the band-gap in graphene oxide

被引：12
|
作者：
Akbari, Ebrahim [1 ]
Akbari, Iman [2 ]
Ebrahimi, Mohammad Reza [1 ]
机构：
[1] Sharif Univ Technol, Dept Phys, POB 11155-9161, Tehran, Iran
[2] Univ Yasuj, Dept Phys, POB 75918-74934, Yasuj, Iran
来源：
EUROPEAN PHYSICAL JOURNAL B | 2019年 / 92卷 / 04期
关键词：
Solid State and Materials; NONLINEAR-OPTICAL PROPERTIES; FUNCTIONALIZED GRAPHENE; DOPED GRAPHENE; GRAPHITE OXIDE; CONDUCTIVITY; REDUCTION; MONOLAYER; CHEMISTRY; OXIDATION;
D O I：
10.1140/epjb/e2019-90675-y
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Although the band-gap in pure graphene is zero, the oxygenated graphene could have a considerable band-gap. The D/G peak intensity ratio is known as a measure of the size of sp(3)/sp(2) domains in graphene oxide (GO) sheets and determines the band-gap in GO sheets. Characterization results showed that the photoluminescence (PL) spectra of GO suspensions has a peak at similar to 604 nm and also the I(D)/I(G) intensity ratio of GO suspensions is 1.73. After reduction, a redshift appeared at PL spectrum (at 650 nm) and the I(D)/I(G) intensity ratio decrease to 1.26. Our results showed that the band-gap in GO is related to the I(D)/I(G) intensity ratio of GO suspensions and offers a mechanism for measuring the band gap according to Raman spectra. Moreover, GO is fluorescent over a broad range of wavelengths and can be used in the biological application.
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页数：6
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