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Optical Properties and Radial Breathing Modes Present in Cu Amorphous Quantum Dots Obtained by Green Synthesis

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Colloidal copper quantum dots with amorphous structure have been obtained by green synthesis using the extract of the plant Opuntia ficus-indica . The quantum dots obtained had a size of approximately 1 nm. The optical properties studied have shown a band in the absorption spectrum centered at 550 nm, originated by plasmon resonance. The broad width of the absorption band is discussed in terms of electronic excitations by Density Functional Theory (DFT) calculations. The Raman spectrum of the sample also presented a Raman band to low wavenumbers centered at 273 cm–1. Additionally, DFT was employed to study the vibrational modes present in minimum energy copper clusters (Cun, n = 3–12). The Radial breathing modes were found between 270–330 cm–1, in low-energy structures of Cu.
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Document Type: Short Communication

Publication date: July 1, 2014

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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