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The role of edible mushrooms in the green synthesis of CdS quantum dots

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The role of edible mushrooms in the green synthesis of CdS quantum dots
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43
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CC Attribution 3.0 Germany:
You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
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Production Year2020
Production PlaceLavras, Minas Gerais, Brazil

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Through the science known as Myconanotechnology, it is possible to use fungi to carry out the green synthesis of nanoparticles, an economically viable and eco-friendly alternative to obtain nanomaterials. Quantum dots (QDs) are great examples that can resultfrom this process. Such elements are semiconductor nanoparticles confined in the three spatial dimensions, which possess optical and electronical properties strictly related to their size. Thus, this research aims to use five species of edible fungi to perform the green synthesis of type II-IV CdS quantum dots with the capacity of absorbing and emitting light. The edible fungi Pleurotus ostreatus, Pleurotus sp., Coprinus comatus, Coprinussp.and Agaricus subrufescens used in this study were obtained from the culture collection of fungi of the Agricultural Microbiology laboratory from the Federal University of Lavras (UFLA), Brazil. The cultivation was carried out in 250mL Erlenmeyer flasks containing 100mL of sterile potato dextrose broth (PBD). Five discs of mycelium from each fungal species were placed into the individual flasks. Hence, the mycelia were cultured superficially in a shaker at 27◦C for 10 days. Then, the mycelia were filtered and washed in ultrapure water for 10 times so as to eliminate the residual culture medium. Hereafter, 50mL of ultrapure water was added to the mycelia, which were incubated for 4 days at 27◦C. In order to produce CdS QDs, solutions of CdSO4and Na2S were added to the flasks containing fungal mycelia, which then presented photoluminescent properties under UV light, which can be interpreted as a qualitative indicator of the presence of nanoparticles. Samples from each flask were extracted, centrifuged and the supernatants were dilluted in ultrapure water. A solution without adding cadmium sulfate and sodium sulphide was used as a control. The ultraviolet-visible (UV-Vis) absorbtion spectra ofthe CdS quantum dots will be measured, and the luminescence spectra analysis will be carried out so as to evaluate the size range of the nanoparticles produced.
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