Green synthesis and formation mechanism of nanostructured Bi2Te3 using ascorbic acid in aqueous solution

Shun Yokoyama, Keita Sato, Makoto Muramatsu, Takehiro Yamasuge, Takashi Itoh, Kenichi Motomiya, Hideyuki Takahashi, Kazuyuki Tohji

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Nanostructured Bi2Te3 can be synthesized in 100% yield by a chemical reduction method in aqueous TeO32- solution using mild and safe ascorbic acid as reducing agent instead of toxic reducing agent commonly employed. Additionally, ascorbic acid works not only as reducing agent but also as capping agent which has an excellent oxidation resistance. In general, ascorbic acid cannot directly reduce TeO32- to metal Te due to the lower reduction potential of TeO32-. Electrochemical analysis and ESI-TOFMS study showed that TeO32- changes to metal Te via easily reducible Te species with ascorbic acid [TeO2(C6H6O6)]2-, and subsequently metal Te triggers the reduction of Bi species, resulting in the Bi2Te3 nanoparticles. This finding creates a path of green synthesis method for nanostructured metal tellurides which have various applications.

Original languageEnglish
Pages (from-to)789-796
Number of pages8
JournalAdvanced Powder Technology
Volume26
Issue number3
DOIs
Publication statusPublished - 2015 May 1

Keywords

  • Aqueous solution
  • Ascorbic acid
  • Chemical reduction
  • Green synthesis
  • Nanostructured BiTe

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Mechanics of Materials

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