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http://hdl.handle.net/2289/5620
Title: | Enhanced optical limiting in functionalized hydrogen exfoliated graphene and its metal hybrids |
Authors: | Anand, Benoy Kaniyoor, Adarsh Sai, Siva Sankara S. Philip, Reji Ramaprabhu, Sundara |
Issue Date: | 21-Apr-2013 |
Publisher: | Royal Society of Chemistry |
Citation: | Journal of Materials Chemistry C, Vol 1, P 2273-2780 |
Abstract: | We present the mechanism and performance of optical limiting (OL) in hydrogen exfoliated graphene (HEG), functionalized HEG (f-HEG) and its metal hybrids. At the wavelengths used, the mechanism of nonlinear absorption (NLA) involves two-photon absorption and excited state absorption in the nanosecond excitation regime, and saturable absorption in combination with two-photon absorption in the femtosecond (ultrafast) excitation regime. The role of defects in the OL performance of HEG and f-HEG is investigated with the help of their Raman spectra. OL efficiency of f-HEG is found to improve with Pt and Pd nanoparticle decoration due to an enhanced NLA, which arises mainly from interband transitions between the d band and the s–p conduction band in the metal NPs, and charge transfer between f-HEG and metal NPs. Thermally induced light scattering is negligible in these water dispersed systems. |
Description: | Restricted Access. |
URI: | http://hdl.handle.net/2289/5620 |
ISSN: | 2050-7534 (Online) 2050-7526 |
Alternative Location: | http://dx.doi.org/10.1039/C3TC00927K |
Copyright: | 2013 Royal Society of Chemistry |
Appears in Collections: | Research Papers (LAMP) |
Files in This Item:
File | Description | Size | Format | |
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2013_JoMatChemC_2773.pdf Restricted Access | Restricted Access | 754.47 kB | Adobe PDF | View/Open Request a copy |
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