Abstract
The nonlinear optical and optical limiting properties of an oligothiophene (6THIOP) covalently functionalized graphene hybrid material (Graphene-6THIOP) were investigated by using Z-scan technique with a 5 ns Q-switched pulsed laser at 532 nm. Results show that the hybrid material of Graphene-6THIOP exhibits enhanced nonlinear optical and optical limiting properties in comparison to individual 6THIOP, graphene moiety and C60. The enhanced nonlinear optical properties of Graphene-6THIOP should be attributed to the combination of the observed nonlinear scattering with the possible photoinduced electron or energy transfer mechanism between 6THIOP moiety and graphene.
Highlights
The development of high-power laser sources has motivated an extensive research for designs of optical limiting systems for eye and sensor protection
The enhanced optical limiting performance was believed to arise from a combination of nonlinear mechanisms with the photoinduced electron or energy transfer from the electron donor porphyrin moiety to the electron-acceptor graphene, similar results have been observed in the hybrid materials of single-walled carbon nanotube (SWNT)-Porphyrin [16]
We report the nonlinear optical and optical limiting properties of oligothiophene (6THIOP)-covalently functionalized graphene hybrid material (Graphene-6THIOP) at 532nm
Summary
The development of high-power laser sources has motivated an extensive research for designs of optical limiting systems for eye and sensor protection. Carbon black suspensions (CBS) can undergo dramatic changes in transmittance because of nonlinear scattering [3] Both single-walled carbon nanotube (SWNT) and multiwalled carbon nanotube (MWNT) suspensions have been reported to have strong optical limiting effects due to strong nonlinear scattering [4,5,6], similar to CBS, while some soluble carbon nanotubes have shown relatively weak optical limiting properties because of a proposed nonlinear absorption mechanism [7,8,9]. Results show that 6THIOP shows no obvious nonlinear optical properties, the covalent attachment of 6THIOP to graphene makes Graphene-6THIOP exhibit enhanced nonlinear optical and optical limiting properties compared with individual 6THIOP, graphene moiety and C60 due to the observed nonlinear scattering behavior and the possible photoinduced electron or energy transfer mechanism
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