Nitrogen-Functionalized Graphene Nanoflakes (GNFs:N): Tunable Photoluminescence and Electronic Structures

被引：47

作者：

Chiou, J. W. ^{[2
]}

Ray, Sekhar C. ^{[1
,3
,4
]}

Peng, S. I. ^{[1
]}

Chuang, C. H. ^{[1
]}

Wang, B. Y. ^{[1
]}

Tsai, H. M. ^{[5
]}

Pao, C. W. ^{[5
]}

Lin, H-J ^{[5
]}

Shao, Y. C. ^{[1
]}

Wang, Y. F. ^{[1
]}

Chen, S. C. ^{[1
]}

Pong, W. F. ^{[1
]}

Yeh, Y. C. ^{[6
]}

Chen, C. W. ^{[6
]}

Chen, L-C ^{[7
]}

Chen, K-H ^{[8
]}

Tsai, M-H ^{[9
]}

Kumar, A. ^{[10
]}

Ganguly, A. ^{[10
]}

Papakonstantinou, P. ^{[10
]}

Yamane, H. ^{[11
]}

Kosugi, N. ^{[11
]}

Regier, T. ^{[12
]}

Liu, L. ^{[13
]}

Sham, T. K. ^{[13
]}

机构：

[1] Tamkang Univ, Dept Phys, Tamsui 251, Taiwan

[2] Natl Univ Kaohsiung, Dept Appl Phys, Kaohsiung 811, Taiwan

[3] Univ Witwatersrand, DST NRF Ctr Excellence Strong Mat, Sch Phys, ZA-2050 Johannesburg, South Africa

[4] Univ Witwatersrand, MPRI, ZA-2050 Johannesburg, South Africa

[5] Natl Synchrotron Radiat Res Ctr, Hsinchu 300, Taiwan

[6] Natl Taiwan Univ, Dept Mat Sci & Engn, Taipei 106, Taiwan

[7] Natl Taiwan Univ, Ctr Condensed Matter Sci, Taipei 106, Taiwan

[8] Acad Sinica, Inst Atom & Mol Sci, Taipei 106, Taiwan

[9] Natl Sun Yat Sen Univ, Dept Phys, Kaohsiung 804, Taiwan

[10] Univ Ulster, Sch Elect & Mech Engn, ERI, Newtownabbey BT37 OQB, Antrim, North Ireland

[11] Inst Mol Sci, Okazaki, Aichi 444, Japan

[12] Canadian Light Source Inc, Saskatoon, SK S7N 0X4, Canada

[13] Univ Western Ontario, Dept Chem, London, ON N6A 5B7, Canada

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2012年 / 116卷 / 30期

基金：

新加坡国家研究基金会;

关键词：

DOPED GRAPHENE; OPTICAL LUMINESCENCE; ABSORPTION; RECOMBINATION;

D O I：

10.1021/jp303465u

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

This study investigates the strong photoluminescence (PL) and X-ray excited optical luminescence observed in nitrogen-functionalized 2D graphene nanoflakes (GNFs:N), which arise from the significantly enhanced density of states in the region of pi states and the gap between pi and pi* states. The increase in the number of the sp(2) clusters in the form of pyridine-like N-C, graphite-N-like, and the C=O bonding and the resonant energy transfer from the N and O atoms to the sp(2) clusters were found to be responsible for the blue shift and the enhancement of the main PL emission feature. The enhanced PL is strongly related to the induced changes of the electronic structures and bonding properties, which were revealed by the X-ray absorption near-edge structure, X-ray emission spectroscopy, and resonance inelastic X-ray scattering. The study demonstrates that PL emission can be tailored through appropriate tuning of the nitrogen and oxygen contents in GNFs and pave the way for new optoelectronic devices.

引用

页码：16251 / 16258

页数：8

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