Rawan, S. Abou-Assy and Bahig, A. El-Deeb and Abdullah, D. Al-Talhi and Nasser, Y. Mostafa (2019) Biosynthesis of cadmium selenide quantum dots by Providencia vermicola. African Journal of Microbiology Research, 13 (6). pp. 106-121. ISSN 1996-0808
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Abstract
Cadmium selenide quantum dots (CdSe QDs) were synthesized by using Providencia vermicola BGRW, which has discriminatory ability to resist many metals such as Selenium, Cadmium, Silver, Zinc, Copper, Lead, Nickel, Cobalt and Bismuth metals. BGRW was able to grow in the presence of 6 mM of CdCl2. The best conditions for extra/intracellular CdSe QDs synthesis were 0.1 mM SeO2: 0.9 mM CdCl2, 37°C, pH 9 within 24 h. The biosynthesis of CdSe QDs was monitored by UV–Visible spectrum that showed surface plasmon resonance (SPR) peaks at 388 nm. Depending on fluorescence property of quantum dots, photoluminescence characteristics of the biogenic CdSe QDs were at 385 nm. Further characterization of synthesized CdSe QDs was carried out using the X-ray Diffraction (XRD), Transmission Electron Microscope (TEM) and Fourier Transform Infrared (FTIR) spectroscopy. TEM and XRD analysis revealed that CdSe QDs was cubic in shape with a size range of ∼2 to 4 nm. EDS analysis confirmed the composition of QDs from cadmium and selenium ions. FTIR spectroscopy confirmed the presence of proteins as the stabilizing agent surrounding the quantum dots.
Item Type: | Article |
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Subjects: | Academics Guard > Biological Science |
Depositing User: | Unnamed user with email support@academicsguard.com |
Date Deposited: | 29 Mar 2023 07:56 |
Last Modified: | 25 May 2024 09:38 |
URI: | http://science.oadigitallibraries.com/id/eprint/384 |