Modified top-down approach for synthesis of molybdenum oxide quantum dots: sonication induced chemical etching of thin films

A simple and modified top-down approach to synthesize molybdenum oxide (MoO x : x = 2, 3) quantum dots (QDs) is proposed in this study. This modified approach involves the conversion of a bulk powder material into thin films followed by a sonication induced chemical etching process for synthesising...

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Bibliographic Details
Published in:RSC advances 2020-01, Vol.1 (6), p.315-3114
Main Authors: Borah, Dibya Jyoti, Mostako, Abu Talat Tahir, Borgogoi, Angshuman Thunder, Saikia, Prasanta Kumar, Malakar, Ashim
Format: Article
Language:English
Subjects:
Absorption spectra
Chemical etching
Chemistry
Crystal structure
Diffraction patterns
Electron diffraction
Emission analysis
Emission spectra
Excitation spectra
Fourier transforms
Image transmission
Infrared analysis
Infrared spectra
Molybdenum
Molybdenum oxides
Organic chemistry
Photoluminescence
Quantum dots
Structural analysis
Thin films
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Summary:A simple and modified top-down approach to synthesize molybdenum oxide (MoO x : x = 2, 3) quantum dots (QDs) is proposed in this study. This modified approach involves the conversion of a bulk powder material into thin films followed by a sonication induced chemical etching process for synthesising QDs. X-Ray Diffraction (XRD) is used for crystal structural characterization of MoO x thin films. The crystal structure properties of the MoO x QDs are analysed by High Resolution Transmission Electron Microscopy (HRTEM) images and corresponding Selected Area Electron Diffraction (SAED) patterns. The optical band gap is estimated by Tauc's plot from UV-Vis-NIR absorption spectra. The excitation dependent photoluminescence (PL) emission of MoO x QDs as a function of acid concentration is investigated. The growth mechanism of QDs in different crystalline phases as a function of acid concentration is also exemplified in this work. The micro-Raman and Fourier Transform of Infrared (FTIR) spectra are recorded to analyse the vibrational spectrum of the molybdenum-oxygen (Mo-O) bonds in the MoO x QDs. A simple and modified top-down approach to synthesize molybdenum oxide (MoO x : x = 2, 3) quantum dots (QDs) is proposed in this study.
ISSN:2046-2069
2046-2069
DOI:10.1039/c9ra09773b