ToF-SIMS Analysis of UV-Switchable TiO2-Nanoparticle-Coated Paper Surface

M Stepien, JJ Saarinen, H Teisala, M Tuominen, M Aromaa, J Haapanen, J Kuusipalo, JM Makela, M Toivakka

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43 Citations (Scopus)

Abstract

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.
Original languageEnglish
Pages (from-to)3780-3790
Number of pages11
JournalLangmuir
Volume29
Issue number11
DOIs
Publication statusPublished - 19 Mar 2013
MoE publication typeA1 Journal article-refereed

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