Enhanced optical limiting in functionalized hydrogen exfoliated graphene and its metal hybrids

Please use this identifier to cite or link to this item: 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
2013_JoMatChemC_2773.pdf Restricted Access	Restricted Access	754.47 kB	Adobe PDF	View/Open Request a copy