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Issue 42, 2018
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Surface oxygen-containing defects of graphene nanosheets with tunable nonlinear optical absorption and refraction

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Abstract

Surface oxygen-containing defects of graphene nanosheets (G NSs) are important for the nonlinear optical (NLO) properties in optoelectric devices. G NSs with different surface oxygen-containing defects are successfully tuned by a chemical reduction process, and are characterized by several experimental measurements of morphology and structure and by spectroscopy. Their NLO properties are measured with the Z-scan technique and the NLO transmission method using a 30 picosecond single-pulse laser source at 532 nm wavelength. Their NLO susceptibility is enhanced 11.8 times (from 0.38 × 10−12 esu to 4.5 × 10−12 esu) with the decrease in the density of surface oxygen-containing groups, while it is reduced 7.2 times (2.7 × 10−12 esu) with a further decrease in oxygen. Accordingly, the nonlinear absorption coefficient of graphene is increased from 0.51 cm GW−1 to 5.90 cm GW−1, and then decreased to 3.41 cm GW−1, indicating that the NLO response of graphene NSs should be weakened whether the component of surface oxygen-containing groups is too large or too small. The local field effect arising from surface oxygen-containing groups and isolated sp2 clusters is the dominant mechanism for the NLO improvement, while the connection of small sp2 clusters depresses the optical nonlinearity. An evolution from two-photon absorption to saturable absorption with the decrease of surface oxygen concentration is obtained. The intensity-related NLO absorption and refraction in NSs are also discussed. Tuning the surface oxygen-containing defects of graphene is a useful way to enhance the optical nonlinearity for potential applications in devices.

Graphical abstract: Surface oxygen-containing defects of graphene nanosheets with tunable nonlinear optical absorption and refraction

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Publication details

The article was received on 03 Aug 2018, accepted on 08 Oct 2018 and first published on 09 Oct 2018


Article type: Paper
DOI: 10.1039/C8CP04940H
Citation: Phys. Chem. Chem. Phys., 2018,20, 27105-27114
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    Surface oxygen-containing defects of graphene nanosheets with tunable nonlinear optical absorption and refraction

    B. Zhu, F. Wang, P. Li, C. Wang and Y. Gu, Phys. Chem. Chem. Phys., 2018, 20, 27105
    DOI: 10.1039/C8CP04940H

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