Exploring the Origin of Blue and Ultraviolet Fluorescence in Graphene Oxide

详细信息    查看全文

• 作者：Daichi Kozawa ; Yuhei Miyauchi ; Shinichiro Mouri ; Kazunari Matsuda
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2013
• 出版时间：June 20, 2013
• 年：2013
• 卷：4
• 期：12
• 页码：2035-2040
• 全文大小：394K
• 年卷期：v.4,no.12(June 20, 2013)
• ISSN：1948-7185

文摘

We studied the fluorescence (FL) properties of highly exfoliated graphene oxide (GO) in aqueous solution using continuous-wave and time-resolved FL spectroscopy. The FL spectra of highly exfoliated GO showed two distinct peaks at 440 (blue) and 300 nm [ultraviolet (UV)]. The FL of GO in the UV region at 300 nm was observed for the first time. The average FL lifetimes of the emission peaks at 440 and 300 nm are 8鈥?3 and 6鈥? ns, respectively. The experimentally observed peak wavelengths of pH-dependent FL, FL excitation spectra, and the FL lifetimes are nearly coincident with those of aromatic compounds bound with oxygen functional groups, which suggests that the FL comes from sp² fragments consisting of small numbers of aromatic rings with oxygen functional groups acting as FL centers in the GO.

Keywords:

graphene oxides; optical properties; fluorescence; photoluminescence