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Mapping surface-modified titania nanoparticles with implications for activity and facet control.

Yung-Kang Peng¹, Yichen Hu², Hung-Lung Chou³

¹The Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford, OX1 3QR, UK.

Nature Communications

|September 24, 2017

Summary

This study details the chemical analysis of titanium dioxide (TiO2) facets using 31P adsorbate nuclear magnetic resonance (NMR). The findings enable quantitative evaluation of surface species, aiding rational control of TiO2 facets for applications.

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Synthesis and Reaction Chemistry of Nanosize Monosodium Titanate

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Area of Science:

Materials Science
Surface Chemistry
Nanotechnology

Background:

Controlling nanoparticle morphology and surface properties is crucial for applications like solar cells and catalysis.
Understanding the chemical state of exposed facets in metal oxide nanocrystals is challenging.
Surface additives significantly influence nanoparticle reactivity and performance.

Purpose of the Study:

To analyze surface species on TiO2 facets using 31P adsorbate nuclear magnetic resonance (NMR).
To quantitatively evaluate the electronic and structural effects of surface additives on TiO2.
To investigate the removal mechanisms of surface species and their impact on TiO2 facets.

Main Methods:

Detailed chemical analysis of TiO2 facets using 31P adsorbate NMR spectroscopy.
Employing a phosphine probe molecule to map surface chemistry differences.
Utilizing complementary characterization techniques to support NMR findings.

Main Results:

Quantitative evaluation of electronic and structural effects of surface species (OH, O, SO4, F) on TiO2 facets.
Demonstration of the capability to assess the impact of post-treatments on surface species.
Successful mapping of surface chemistry variations on different TiO2 facets.

Conclusions:

31P adsorbate NMR provides quantitative insights into surface species on TiO2 facets.
This method facilitates understanding of structure-activity relationships for enhanced performance.
Rational control of active TiO2 (001) and (101) facets is achievable for diverse applications.