Drying and nondrying layer-by-layer assembly for the fabrication of sodium silicate/TiO 2 nanoparticle composite films

Lianbin Zhang, He Liu, Engui Zhao, Lingying Qiu, Junqi Sun*, Jiacong Shen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Influences of drying and nondrying steps on structures of layer-by-layer (LbL) assembled sodium silicate/TiO 2 nanoparticles films (donated as silicate/TiO 2 films) have been systematically investigated. The nondrying LbL assembly produces highly porous silicate/TiO 2 films with large thickness. In contrast, the silicate/TiO 2 films fabricated with a drying step after each layer deposition are flat and thin without porous structures. In situ atomic force microscopy (AFM) measurements confirm that the sodium silicate and TiO 2 nanoparticles are deposited in their aggregated forms. A N 2 drying step can disintegrate the aggregated silicate and TiO 2 nanoparticles to produce thin silicate/TiO 2 films with compact structures. Without the drying steps, the aggregated silicate and TiO 2 nanoparticles are well retained, and their LbL assembly produces highly porous silicate/TiO 2 films of large thickness. The highly porous silicate/TiO 2 films are demonstrated to be useful as reusable film adsorbents for dye removal from wastewater because they can adsorb a large amount of cationic organic dyes and decompose them under UV irradiation. The present study is meaningful for exploring drying/nondrying steps for tailoring structure and functions of LbL assembled films.

Original languageEnglish (US)
Pages (from-to)1816-1823
Number of pages8
JournalLangmuir
Volume28
Issue number3
DOIs
StatePublished - Jan 24 2012

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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