Synthesis and characterization of polycrystalline Sn and SnO2 films with wire morphologies

Clara Santato, Carmen M. López, Kyoung Shin Choi

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

A new electrodeposition condition has been developed to prepare films composed of Sn wires, using dimethyl sulfoxide (DMSO) as a plating medium. The morphology of Sn deposits varied significantly depending on the aging time of the solution as well as the amount of electric charge passed through the cell prior to deposition. The wire morphology was obtained only when the DMSO solution containing 0.1 M SnCl2 and 0.5 M NaNO3 was aged for 2 weeks at room temperature and 20 C of electric charge were passed through the cell (-1.8 V vs. Ag/AgCl at the working electrode) before deposition. Otherwise, spherical agglomerations of Sn particles that resemble the shape of cauliflowers were obtained. Electrospray ionization mass spectrometry revealed that the combination of the aging and passing electric charge processes increased the amount of tetravalent tin ions and the chloride to tin ratio in the plating medium, resulting in the formation of SnCl62 - species without which Sn wires cannot be formed. The electrochemically deposited Sn films were converted to SnO2 films by thermal oxidation while preserving the original morphologies. The SnO2 films with wire morphology exhibited superior photoelectrochemical performances compared to the cauliflower morphology although both of these morphologies contain SnO2 nanoparticles of similar sizes (6-15 nm). Optimizing conditions to control the fine details of wire growth is expected to create opportunities to investigate and exploit wire morphologies of Sn and SnO2 to construct efficient and cost-effective electrode materials for Li-ion batteries and photoelectrochemical cells.

Original languageEnglish
Pages (from-to)1519-1524
Number of pages6
JournalElectrochemistry Communications
Volume9
Issue number7
DOIs
Publication statusPublished - Jul 2007
Externally publishedYes

    Fingerprint

Keywords

  • Electrodeposition
  • Photocurrent
  • Polycrystalline films
  • Tin
  • Tin oxide
  • Wire

ASJC Scopus subject areas

  • Electrochemistry

Cite this