Carbon Based Quantum Dots: Synthesis, Characterisation and Study of Optical Properties
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Date
2018
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Punjab Agricultural University, Ludhiana
Abstract
Carbon based quantum dots are the emerging class of nanomaterials that consists of graphene quantum dots (GQDs) and carbon quantum dots (CQDs), have gained tremendous attention for their characteristics such as good stability, highly fluorescent nature, biocompatibility and chemical inertness. In this study, we aimed to develop a simple, efficient, economic and sustainable approach for synthesis of carbon based quantum dots from agricultural waste. Sugarcane bagasse is one of the major solid agricultural waste. We developed a novel strategy for efficient recycling of agricultural waste to synthesize carbon based quantum dots from sugarcane bagasse. Herein, graphene quantum dots have been synthesized by chemical cutting from graphene oxide. Chemical oxidation followed by exfoliation method was used to synthesise carbon quantum dots. The as synthesised carbon based quantum dots were structurally characterised by Scanning electron microscopy (SEM), Transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR). The quantum dots were optically characterised by Fluorescence microscopy and UV-vis spectroscopy. Carbon based quantum dots were highly fluorescent in nature. The particles were seen with blue emission under UV filter. SEM and TEM analysis indicate size, shape and monodispersed nature of carbon based quantum dots along with structural information about graphene oxide and sugarcane bagasse. The presence of large amount of oxygenous functionality was confirmed by FT-IR spectra and UV-vis spectroscopy. The synthesis process focuses on agricultural waste management by using sugarcane bagasse as precursor for developing carbon based quantum dots which possesses noble optical properties and thus wide range of applications.
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