Optical properties of graphene oxide and reduced graphene oxide determined by spectroscopic ellipsometry

被引：108

作者：

Schoche, Stefan ^{[1
]}

Hong, Nina ^{[1
]}

Khorasaninejad, Mohammadreza ^{[2
]}

Ambrosio, Antonio ^{[2
,3
,4
]}

Orabona, Emanuele ^{[3
,4
]}

Maddalena, Pasqualino ^{[3
,4
]}

Capasso, Federico ^{[2
]}

机构：

[1] Woollam Co Inc, 645 M St,Suite 102, Lincoln, NE 68508 USA

[2] Harvard Univ, Sch Engn & Appl Sci, 29 Oxford St, Cambridge, MA 02138 USA

[3] Univ Napoli Federico II, CNR SPIN, Via Cintia, I-80126 Naples, Italy

[4] Univ Napoli Federico II, Dipartimento Fis, Via Cintia, I-80126 Naples, Italy

来源：

APPLIED SURFACE SCIENCE | 2017年 / 421卷

关键词：

Graphene oxide; Reduced graphene oxide; Few-layer graphene; Spectroscopic ellipsometry; Optical constants; EXFOLIATED GRAPHITE OXIDE; INDUCED REDUCTION; FILMS;

D O I：

10.1016/j.apsusc.2017.01.035

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：

We report the optical constants of graphene oxide and reduced graphene oxide determined by spectroscopic ellipsometry. The dynamic changes in optical properties and thickness of a drop-cast graphene oxide layer during reduction by long-term exposure to focused broad-band white light are monitored in situ. The anisotropic optical constants of the graphene oxide layer and the isotropically averaged optical constants of the reduced layer are precisely determined from a multiple-location analysis of spatially resolved data across the exposed location and a multiple-time-step analysis of the dynamic data, respectively. Observed inter-band transitions in the graphene oxide layer are discussed in relation to theoretical predictions for different coverage levels of the graphene oxide sheets with oxygen containing functional groups. The derived optical constants of the reduced graphene oxide layer are compared to reported values of graphene and thermally reduced graphene oxide. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：778 / 782

页数：5

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