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

110 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

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Hematite
Chemical sensors
Lysine
Ions
Ferrosoferric Oxide
Molecules
Magnetite
Intercalation
Self assembly
Lithium-ion batteries
ferric oxide
Acetates
Ethanol
Nucleation
Heat treatment

ASJC Scopus subject areas

  • Materials Chemistry
  • Chemistry(all)

Cite this

Template-free solvothermal synthesis of hollow hematite spheres and their applications in gas sensors and Li-ion batteries. / Kim, Hyo Joong; Choi, Kwon Il; Pan, Anqiang; Kim, Il Doo; Kim, Hae Ryong; Kim, Kang Min; Na, Chan Woong; Cao, Guozhong; Lee, Jong Heun.

In: Journal of Materials Chemistry, Vol. 21, No. 18, 14.05.2011, p. 6549-6555.

Research output: Contribution to journalArticle

Kim, Hyo Joong ; Choi, Kwon Il ; Pan, Anqiang ; Kim, Il Doo ; Kim, Hae Ryong ; Kim, Kang Min ; Na, Chan Woong ; Cao, Guozhong ; Lee, Jong Heun. / Template-free solvothermal synthesis of hollow hematite spheres and their applications in gas sensors and Li-ion batteries. In: Journal of Materials Chemistry. 2011 ; Vol. 21, No. 18. pp. 6549-6555.
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