Hydrothermal synthesis of selenium and tellurium nanorods

Cao, Guang Sheng; Zhang, Xiao Juan; Ling, Su; Ruan, Yu

doi:10.1080/17458081003774677

Cited by 21 publications

(7 citation statements)

References 22 publications

(20 reference statements)

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“…Chemical synthesis of TeNRs is mostly reliant on the addition to the reaction system of surfactant molecules 32 – 34 that adsorb onto the TeNP surface limiting their aggregation 31 . Once the transition from a -Te to t -Te takes place, the formation of single-crystalline NRs is driven by the surfactant molecules that strongly interact with Te 0 atoms, confining the growth of TeNRs along one axis without affecting their diameter 30 , 31 , 35 , 36 . Since little variation in the diameter of the biogenic TeNRs was detected (Supplementary Table S2 ), this observation indicated that amphiphilic biomolecules supplied by the BCP1 cells acting as surfactants could mediate the growth of NRs along one axis.…”

Section: Resultsmentioning

confidence: 99%

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

Presentato

Piacenza

Izadi-Darbandi

et al. 2018

Sci Rep

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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.

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Section: Resultsmentioning

confidence: 99%

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

Presentato

Piacenza

Izadi-Darbandi

et al. 2018

Sci Rep

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“…One approach was to synthesize Se with different morphologies and structures, such as nano-brous Se and porous Se. 12,13 Kundu et al prepared brous Se as a cathode material with a reversible capacity of 375 A h kg À1 at a rate of C/13. Another approach was to conne Se within various forms of carbon material, such as porous carbon, 8 carbon nanotubes 10 and reduced graphene oxide.…”

Section: Introductionmentioning

confidence: 99%

Hollow selenium encapsulated into 3D graphene hydrogels for lithium–selenium batteries with high rate performance and cycling stability

Fan

Zhang

et al. 2017

RSC Adv.

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“…Synthesis methods of selenium structures include photocatalytic, pulsed laser ablation, vapor deposition, hydrothermal, solvothermal, microwave-assisted, and electrochemical. These methods have been utilized in earlier works to achieve various morphologies including nanorods (Cao et al, 2011 ), nanowires (An et al, 2003 ), nanotubes (Chen and Gao, 2006 ), and butterfly-like structures (Zeng et al, 2013 ). Electrochemical deposition (or electrodeposition) uses an electric current to deposit a material onto a conducting surface by electrochemical reduction; it is a particularly attractive method as it not only is simple and cost-effective, but also allows for fine tuning of size, composition, surface structure and thus chemical and electrical properties via precise control of reaction conditions.…”

Section: Introductionmentioning

confidence: 99%

Template-Free Electrochemical Deposition of t-Se Nano- and Sub-micro Structures With Controlled Morphology and Dimensions

Seyedmahmoudbaraghani

Lim

et al. 2020

Front. Chem.

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Selenium, depending on its crystal structure, can exhibit various properties and, as a result, be used in a wide range of applications. However, its exploitation has been limited due to the lack of understanding of its complex growth mechanism. In this work, template-free electrodeposition has been utilized for the first time to synthesize hexagonal-selenium (t-Se) microstructures of various morphologies at 80°C. Cyclic voltammetry (CV) and linear sweep voltammetry (LSV) revealed 5 reduction peaks, which were correlated with possible electrochemical or chemical reaction related to the formation of selenium. Potentiostatic electrodeposition using 100 mM SeO 2 showed selenium nanorods formed at−0.389 V then increased in diameter up to −0.490 V, while more negative potentials (-0.594 V) induced formation of sub-micron wires with average diameter of 708 ± 116 nm. Submicron tubes of average diameter 744 ± 130 nm were deposited at −0.696 V. Finally, a mixture of tubes, wires, and particles was observed at more cathodic potential due to a combination of nucleation, growth, dissolution of structures as well as formation of amorphous selenium via comproportionation reaction. Texture coefficient as a function of applied potential described the preferred orientation of the sub-microstructures changed from (100) direction to more randomly oriented as more cathodic potentials were applied. Lower selenium precursor concentration lead to formation of nanowires only with smaller average diameters (124 ± 42 nm using 1 mM, 153 ± 46 nm using 10 mM SeO 2 at −0.389 V). Time-dependent electrodeposition using 100 mM selenium precursor at −0.696 V explained selenium was formed first as amorphous, on top of which nucleation continued to form rods and wires, followed by preferential dissolution of the wire core to form tubes.

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Hydrothermal synthesis of selenium and tellurium nanorods

Cited by 21 publications

References 22 publications

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

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

Hollow selenium encapsulated into 3D graphene hydrogels for lithium–selenium batteries with high rate performance and cycling stability

Template-Free Electrochemical Deposition of t-Se Nano- and Sub-micro Structures With Controlled Morphology and Dimensions

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