ToF-SIMS analysis of UV-switchable TiO₂-nanoparticle-coated paper surface

A1 Journal article (refereed)

Internal Authors/Editors

Publication Details

List of Authors: Milena Stepien, Jarkko J. Saarinen, Hannu Teisala, Mikko Tuominen, Mikko Aromaa, Janne Haapanen, Jurkka Kuusipalo, Jyrki M. Mäkelä, and Martti Toivakka
Publication year: 2013
Journal: Langmuir
Journal acronym: LANGMUIR
Volume number: 29
Issue number: 11
Start page: 3780
End page: 3790
Number of pages: 11
ISSN: 0743-7463
eISSN: 1520-5827


The chemical composition of a TiO2 nanoparticle coated paper surface was analyzed using time-of-flight secondary ion mass spectrometry (ToF-SIMS) to study the interconnection between wettability and surface chemistry on the nanoscale. In this work, a superhydrophobic TiO2 surface rich in carboxyl-terminated molecules was created by a liquid flame spray process. The TiO2 nanoparticle coated paper surface can be converted by photocatalytic oxidation into a highly hydrophilic one. Interestingly, the hydrophilic surface can be converted back into a superhydrophobic surface by heat treatment. The results showed that both ultraviolet A (UVA) and oven treatment induce changes in the surface chemistry within a few nanometers of the paper surface. These findings are consistent with those from our previously reported X-ray photoelectron spectroscopy (XPS) analysis, but the ToF-SIMS analysis yields more accurate insight into the surface chemistry.

Last updated on 2019-21-10 at 03:30