Tunable photoluminescence of graphene oxide from near-ultraviolet to blue

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• 作者：Guoqing Xin^a ; Yinan Meng^a ; Yifei Ma^a ; Duyen Ho^a ; Namhun Kim^a ; Sung M. Cho^a ; Heeyeop Chae^a ; ^b ; ^{hchae@skku.edu}
• 关键词：Graphene oxide ; Photoluminescence ; Raman ; Bandgap
• 刊名：Materials Letters
• 出版年：2012
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：1 May, 2012
• 卷：74
• 期：Complete
• 页码：71-73
• 文件大小：390 K

摘要

Photoluminescence (PL) of solution-processed graphene oxide (GO) was tuned from near-ultraviolet to blue region through controlled hydrazine (N₂H₄) reduction. The peak shifted from 341 nm to 421 nm as hydrazine concentration increased to 0.3 M. Further reduction of the GO increased the density of small sp² nucleus and enhanced the interconnectivity of localized sp² sites. It is deduced that hopping and tunneling effects facilitated the migration of excitons to nonradiative recombination sites, resulting in PL quenching and saturation of PL red-shift.