Tuning the plasmon resonance and work function of laser-scribed chemically doped graphene

被引：28

作者：

Anis, Badawi ^{[1
]}

Abouelsayed, A. ^{[1
]}

El Hotaby, W. ^{[1
]}

Sawy, Amany M. ^{[2
]}

Khalil, Ahmed S. G. ^{[2
,3
]}

机构：

[1] Natl Res Ctr, Div Phys, Dept Spect, 33 El Bohouth St, Giza 12622, Egypt

[2] Fayoum Univ, Fac Sci, Ctr Environm & Smart Technol, Al Fayyum, Egypt

[3] Arab Acad Sci Technol & Maritime Transport, Smart Village Campus, Giza, Egypt

来源：

CARBON | 2017年 / 120卷

关键词：

Terahertz; Plasmon; Work function; Laser scribed; Chemically doping graphene; Monovalent cations; Ag-nanoparticles; Ag-nanowires; SINGLE-LAYER GRAPHENE; SILVER NANOPARTICLE; OXIDE-FILMS; LARGE-AREA; TERAHERTZ; REDUCTION; SPECTROSCOPY; CARBON; NANOSHEETS; GRAPHITE;

D O I：

10.1016/j.carbon.2017.05.010

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：

Here, we present terahertz spectroscopy study on laser scribed graphene (LSG) doped with monovalent Na+ cations (LSG/MNCs), silver nanoparticles (LSG/SNPs), and silver nanowires (LSG/SNWs), in the frequency range from 0.06 to 3 THz. The terahertz absorption peaks observed at approximate to 1.98, 2.06, 2.73, and 3.06 THz are attributed to the collective oscillations of free carriers in LSG, LSG/MNCs, LSG/SNPs, and LSG/SNWs, respectively. The plasmon peak position and Fermi energy E-f of LSG doped samples are shifted to higher energy compared to undoped LSG indicating the n-doping of graphene. The sigma(dc) and the charges concentration n show higher values in case of LSG/SNWs compared to other doped samples. This is mainly because silver nanowires create conducting paths between the neighboring graphene sheets. The charge density n of the LSG and LSG doped samples versus E-f, scales as n(1/4), illustrates power-law behavior which is the signature of the two-dimensional massless Dirac electrons. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：44 / 53

页数：10

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