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Unveiling the Radiative Electron-Hole Recombination of MoS2 Nanostructures at Extreme pH Conditions

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Abstract

Nanostructures of MoS2 are in wide research for optoelectronic, energy and biological applications. Opto-electronic and biological applications requires the tuning of photoluminescence properties of MoS2 nanostructures. In this article, nanosized MoS2 is hydrothermally synthesized, and photoluminescence at extreme pH conditions (pH 1 and 13) is examined. As the photoluminescence gives a key to probe the radiative electron-hole recombination, here, photoluminescence emissions are used as an indicator to suggest the pattern of electron-hole recombination in the material at extreme pH conditions. Raman spectroscopy, dynamic light scattering, Scanning electron microscopic image and energy dispersive x-ray analysis are done for material confirmation. At pH 1 and 13 as-synthesized nanostructured MoS2 exhibited both upconversion and downconversion photoluminescence. The intensity of photoluminescence is varied with respect to pH. Excitation-dependent photoluminescence mechanisms and preliminary understanding on the ratio of quantum yields and life span of excited state of as-synthesized nanostructured MoS2 are unveiled here.

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Data Availability

The datasets generated during and analyzed during the current study are available in the link https://drive.google.com/drive/folders/1z-MXRs6i2f6nac7smZP4Bzg1u4T5WIvh?usp=drive_link.

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Acknowledgements

Authors would like to acknowledge TIFR, Hyderabad for all the support and characterization facilities provided. Authors would like to acknowledge Dr. K. J Saji, Associate Professor, International School of Photonics, CUSAT, Kochin-22, Kerala for providing characterization facilities. We also acknowledge DST-FIST, Govt Victoria College, Palakkad for all the support and providing material synthesising facilities.

Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Authors and Affiliations

  1. Department of Physics, Government Victoria College, Affiliated to University of Calicut, Palakkad, 678001, Kerala, India

    Nayana K. & Sunitha A. P.

  2. Department of Physics, N. S. S. College, Affiliated to University of Calicut, Ottapalam, Palakkad, 679103, Kerala, India

    Nayana K.

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Data collection, analysis, experimentation, investigation and draft preparation were performed by Nayana. K Conceptualization, manuscript structuring and correction, editing and supervision were done by Sunitha. A. P.

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Correspondence to Sunitha A. P..

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K., N., A. P., S. Unveiling the Radiative Electron-Hole Recombination of MoS2 Nanostructures at Extreme pH Conditions. J Fluoresc (2024). https://doi.org/10.1007/s10895-024-03616-w

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