3 years ago

Plasmon mediated enhancement and tuning of optical emission properties of two dimensional graphitic carbon nitride nanosheets.

Sayan Bayan, Samit K Ray, Narendar Gogurla, Achintya Singha, Anupam Midya
We demonstrate the surface plasmon induced enhancement and tunablilty in optical emission properties of two dimensional (2D) graphitic carbon nitride (g-C3N4) nanosheets through the attachment of gold (Au) nanoparticles. Raman spectroscopy has revealed the event of surface enhanced Raman scattering that arises due to the combined effect of charge transfer process and localized surface plasmon induced enhancement in electromagnetic field, both occurring at the nanoparticle-nanosheet interface. Photoluminescence studies suggest that at an optimal concentration of nanoparticles, the emission intensity can be enhanced which is maximum within 500-525 nm region. The fabricated electroluminescent devices reveal that the emission feature can be tuned from bluish-green to red region (~160 nm shift) upon attaching Au nanoparticles. We propose that the π*→π transition in g-C3N4 can trigger surface plasmon oscillation in Au, which subsequently increases the excitation process in the nanosheets and results in the enhanced emission in green region of photoluminescence spectrum. On the other hand, electroluminescence of g-C3N4 can induce plasmon oscillation more efficiently and thus can lead to the red emission from Au nanoparticles through the radiative damping of particle plasmon. The influence of nanoparticle size and coverage on the emission properties of 2D g-C3N4, nanosheets has been studied in detail.

Publisher URL: http://doi.org/10.1088/1361-6528/aa94a6

DOI: 10.1088/1361-6528/aa94a6

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