Biogenic sulfur-based nanocrystals: methods of fabrication and applications
The present review work describes the achievements about the biosynthesis of metal sulfide nanoparticles, or sulfur-based NPs (S-NPs). In general, biosynthesis is performed by utilizing living organisms or derivatives like plant extracts, single biomolecules, and viruses. Among the living organisms...
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| Format: | bachelorThesis |
| Język: | eng |
| Wydane: |
2021
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| Hasła przedmiotowe: | |
| Dostęp online: | http://repositorio.yachaytech.edu.ec/handle/123456789/407 |
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Dodaj etykietę | Streszczenie: | The present review work describes the achievements about the biosynthesis of metal sulfide nanoparticles, or sulfur-based NPs (S-NPs). In general, biosynthesis is performed by utilizing living organisms or derivatives like plant extracts, single biomolecules, and viruses. Among the living organisms are bacteria, fungi, and algae, by which the biosynthesis is generally performed intracellularly or extracellularly, mediated by specific enzymes, proteins, and peptides. Commonly, metal and sulfide salts are supplied to the reaction solution with cell biomass or free-cell extracts. In many cases, the biosynthesis of S-NPs occurs without adding a sulfide source, in this case, the sulfur source is synthesized by the organisms through certain pathways, the participation of peptides, enzymes, and proteins. Diverse types of sulfide NPs have been synthesized with diverse properties highly dependent on several conditions such as the bioentity, time, pH, external mediators, metal, sulfide, and biomass concentration, among others. Adjusting these conditions could lead to the generation of different sized and shaped nanocrystals, properties that still represent a challenge to control in the biosynthesis. Biosynthesis of S-NPs has been demonstrated to be a promising route of novel materials generation. Besides, due to their unique optical, electrical, and biocompatible properties, the bio-generated NPs have performed interesting results applied in cancer research, bioimaging, antimicrobial activity, and electrical fields. In this work, it is provided an extensive bibliographic review about the biosynthesis of S-NPs using biological entities, mechanisms of synthesis, factors controlling the properties of NPs, techniques of characterization, and applications. |
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