Template-free solvothermal synthesis of hollow hematite spheres and their applications in gas sensors and Li-ion batteries

Hyo Joong Kim, Kwon Il Choi, Anqiang Pan, Il Doo Kim, Hae Ryong Kim, Kang Min Kim, Chan Woong Na, Guozhong Cao, Jong Heun Lee

Research output: Contribution to journalArticle

114 Citations (Scopus)

Abstract

Magnetite (Fe3O4) hollow spheres were prepared by solvothermal reaction of ethanol solution containing Fe-acetate and l-lysine, and were subsequently transformed into hematite (Fe2O3) hollow spheres with nanoscale (20-30 nm) thin shells by heat treatment at 500 °C for 2 h. Both the as-prepared and heat-treated hollow spheres contained another small sphere within each shell, which was attributed to the following solvothermal self-assembly reactions: (1) the nucleation of Fe3O 4 spheres, (2) lysine capping on the nuclei, (3) the growth of lysine-capped particles by cross-linking between lysine molecules, and (4) the formation of Fe shell layers by the interaction between Fe ions and outer lysine molecules. In the assembly reaction, l-lysine with amino and carboxyl radicals played the key role. The heat-treated Fe2O3 hollow spheres showed significantly enhanced C2H5OH sensing characteristics and promising Li-ion intercalation behaviors.

Original languageEnglish
Pages (from-to)6549-6555
Number of pages7
JournalJournal of Materials Chemistry
Volume21
Issue number18
DOIs
Publication statusPublished - 2011 May 14

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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