Assembly, growth and conductive properties of tellurium nanorods produced by Rhodococcus aetherivorans BCP1

Alessandro Presentato, Martina Cappelletti, Raymond J. Turner, Max Anikovskiy, Alessandro Presentato, Elena Piacenza, Ali Darbandi, Davide Zannoni

Risultato della ricerca: Articlepeer review

23 Citazioni (Scopus)

Abstract

Tellurite (TeO32-) is a hazardous and toxic oxyanion for living organisms. However, several microorganisms can bioconvert TeO32- into the less toxic form of elemental tellurium (Te0). Here, Rhodococcus aetherivorans BCP1 resting (non-growing) cells showed the proficiency to produce tellurium-based nanoparticles (NPs) and nanorods (NRs) through the bioconversion of TeO32-, depending on the oxyanion initial concentration and time of cellular incubation. Te-nanostructures initially appeared in the cytoplasm of BCP1 cells as spherical NPs, which, as the exposure time increased, were converted into NRs. This observation suggested the existence of an intracellular mechanism of TeNRs assembly and growth that resembled the chemical surfactant-assisted process for NRs synthesis. The TeNRs produced by the BCP1 strain showed an average length (>700 nm) almost doubled compared to those observed in other studies. Further, the biogenic TeNRs displayed a regular single-crystalline structure typically obtained for those chemically synthesized. The chemical-physical characterization of the biogenic TeNRs reflected their thermodynamic stability that is likely derived from amphiphilic biomolecules present in the organic layer surrounding the NRs. Finally, the biogenic TeNRs extract showed good electrical conductivity. Thus, these findings support the suitability of this strain as eco-friendly biocatalyst to produce high quality tellurium-based nanomaterials exploitable for technological purposes.
Lingua originaleEnglish
pagine (da-a)1-10
Numero di pagine10
RivistaScientific Reports
Volume8
Stato di pubblicazionePublished - 2018

All Science Journal Classification (ASJC) codes

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