Femtosecond pump-probe spectroscopy of graphene oxide in water

被引：18

作者：

Shang, Jingzhi ^{[1
]}

Ma, Lin ^{[1
]}

Li, Jiewei ^{[1
,2
,3
]}

Ai, Wei ^{[1
,2
,3
]}

Yu, Ting ^{[1
,4
,5
]}

Gurzadyan, Gagik G. ^{[1
]}

机构：

[1] Nanyang Technol Univ, Div Phys & Appl Phys, Sch Phys & Math Sci, Singapore 637371, Singapore

[2] Nanjing Univ Posts & Telecommun, Key Lab Organ Elect & Informat Displays, Nanjing 210046, Jiangsu, Peoples R China

[3] Nanjing Univ Posts & Telecommun, Inst Adv Mat, Nanjing 210046, Jiangsu, Peoples R China

[4] Natl Univ Singapore, Fac Sci, Dept Phys, Singapore 117542, Singapore

[5] Natl Univ Singapore, Graphene Res Ctr, Singapore 117542, Singapore

来源：

JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2014年 / 47卷 / 09期

基金：

新加坡国家研究基金会;

关键词：

TUNABLE PHOTOLUMINESCENCE; DYNAMICS; FLUORESCENCE; RELAXATION; ABSORPTION;

D O I：

10.1088/0022-3727/47/9/094008

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Transient absorption properties of aqueous graphene oxide (GO) have been studied by use of femtosecond pump-probe spectroscopy. Excited state absorption and photobleaching are observed in the wide spectral range. The observed fast three lifetime components are attributed to the absorption of upper excited states and localized states, which is confirmed by both laser induced absorption and transmission kinetics. The longest time component is assigned to the lowest excited state of GO, which mainly originates from the sp2 domains. With the increase of the excitation power, two-quantum absorption occurs, which results in an additional rise-time component of the observed transients.

引用

页数：7

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