Silicon nanoparticles with UV range photoluminescence synthesized through cryomilling induced phase transformation and etching

Elangovan, H and Sengupta, S and Narayanan, R and Chattopadhyay, K (2021) Silicon nanoparticles with UV range photoluminescence synthesized through cryomilling induced phase transformation and etching. In: Journal of Materials Science, 56 (2). pp. 1515-1526.

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Abstract

We report silicon nanoparticles with a particle size distribution of ~ 80 nm (mode) through controlled impact mode cryomilling of semiconductor grade silicon wafers at a temperature of 200 K under argon atmosphere. The transmission microscopic characterization of these particles establishes a partial transformation of the crystalline silicon into an amorphous phase yielding a two-phase microstructure for each of the particles. A high-speed imaging technique is utilized to understand the effect of impact energy (and milling intensity) on the phase transformation during milling. In a further development, etching of the two-phase nanocomposites leads to the dissolution of the amorphous phase yielding free nanoparticle of ~ 2 nm size that exhibit UV range photoluminescence with potential for sensors and other optical applications. © 2020, Springer Science+Business Media, LLC, part of Springer Nature.

Item Type:	Journal Article
Publication:	Journal of Materials Science
Publisher:	Springer
Additional Information:	Copyright to this article belongs to Springer
Keywords:	Etching; Imaging techniques; Milling (machining); Nanoparticles; Particle size; Particle size analysis; Phase transitions; Photoluminescence; Silicon wafers; Synthesis (chemical); Uranium metallography; Vanadium metallography, Crystalline silicons; Induced phase transformation; Microscopic characterization; Optical applications; Partial transformation; Silicon nanoparticles; Two-phase microstructures; Two-phase nanocomposites, Amorphous silicon
Department/Centre:	Division of Chemical Sciences > Materials Research Centre Division of Interdisciplinary Sciences > Interdisciplinary Centre for Energy Research Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	02 Nov 2020 11:43
Last Modified:	02 Nov 2020 11:43
URI:	http://eprints.iisc.ac.in/id/eprint/67019

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