Graphitic carbon nitride (g-C3N4), which is structurally analogous to graphene, shows excellent fluorescent yield. Sharp ripple structure is observed in the fluorescence spectra of g-C3N4 flakes grafted on the surface of single polymethyl methacrylate (PMMA) microspheres. The intensities and the number of modes of these structures nonlinearly vary with the sizeof micro-cavity and the coupled power. Theoretical simulations carried out with the help of Mie theory show that the ripple structure is dueto modulation of the fluorescenceby the whispering gallery modes (WGMs) of the spherical microcavity. © 2017 IOP Publishing Ltd.

Sundara Ramaprabhu

Department Of Physics

Prem Ballabh Bisht

Aneesh Vincent Veluthandath

Sudhakara Reddy Bongu

Carbon nitride

Fluorescence

Microcavities

Nitrides

Optical resonators

Polymethyl methacrylates

COUPLED POWER

Fluorescence enhancement

Fluorescence spectra

Graphitic carbon nitrides

Mie theory

RIPPLE STRUCTURE

SPHERICAL MICROCAVITY

Theoretical simulation

Whispering gallery modes

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IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

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IIT Madras

Materials Research Express

Pd on nitrogen rich carbon material g-C3N4 has been synthesized by a simple cost-effective method. From the study of the hydrogen storage properties of host g-C3N4 matrix and Pd-g-C3N4 by pressure reduction method using Sievert's apparatus in the ranges 0.1 ≤ PH2(MPa) ≤ 4 and 0 ≤T(°C) ≤ 100, it has been demonstrated that the hydrogen storage capacity of Pd-g-C3N4 reaches 2.6 wt% at 25 °C and 4 MPa. At room temperature, an increase of 66% in the hydrogen uptake capacity is accounted by Pd nanoparticles (Pd-NPs) decoration over host g-C3N4 matrix, clearly demonstrating the hydrogen spillover process. The good dispersion of Pd-NPs over host g-C3N4 matrix and strengthened interaction between the host g-C3N4 matrix and Pd-NPs catalyze the dissociation of hydrogen molecules and subsequent migration of hydrogen atoms to the host g-C3N4 matrix due to spill over mechanism. From the present study, it can be concluded that the nexus between the catalyst support and catalyst particles results in the high hydrogen uptake capacity. © 2014 Hydrogen Energy Publications, LLC. All rights reserved.

International Journal of Hydrogen Energy

Hydrogen storage performance of palladium nanoparticles decorated graphitic carbon nitride

The variation of the molecular density in a single microcavity and its influence on the radiative rate enhancement (RRE) are reported here. The quality factors of the observed morphology-dependent resonances (MDRs) of the microcavity remain unchanged in the absence of any absorbing effects. In contrast, the MDRs tend to disappear in the presence of strong absorption even due to the self-absorption by the molecule. Time-resolved fluorescence studies reveal the fact that the value of RRE decreases with an increase in the adsorbed concentration of the molecules. The results have been explained in terms of a detuning parameter, which is a function of the refractive index of the microcavity. The increased dispersing capability of the microsphere upon increasing its molecular density has been found to be responsible for the observed decrease in RRE. © 2005 American Institute of Physics.

Fulltext

Journal of Chemical Physics

Effect of adsorbed concentration on the radiative rate enhancement of photoexcited molecules embedded in single microspheres

Journal of Nanoscience and Nanotechnology

Graphitic Carbon Nitride Hybrid Supported Metal Nanoparticles as a Novel Low-Cost Counter Electrode for Dye-Sensitized Solar Cell

Advanced Optical Materials

Color-Tunable Photoluminescence and NIR Electroluminescence in Carbon Nitride Thin Films and Light-Emitting Diodes

Optics Express

Nanoscale welding aerosol sensing based on whispering gallery modes in a cylindrical silica resonator

Cavity induced fluorescence enhancement of graphitic carbon nitride submicron flakes

Journal	Materials Research Express
Publisher	Institute of Physics Publishing
ISSN	20531591
Open Access	No