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Water adsorption on TiO2 surfaces probed by soft X-ray spectroscopies: bulk materials vs. isolated nanoparticles. | LitMetric

AI Article Synopsis

  • The study presents a new experimental method using soft X-ray spectroscopy to analyze how water molecules adsorb on the surface of isolated TiO2 nanoparticles without a substrate.
  • Two hydration control methods were tested: drying initially solvated nanoparticles and exposing dry nanoparticles to water vapor.
  • The findings enhance understanding of the hydration states of TiO2 nanoparticles and their interactions with water, potentially advancing research in heterogeneous catalysis involving nanomaterials.

Article Abstract

We describe an experimental method to probe the adsorption of water at the surface of isolated, substrate-free TiO2 nanoparticles (NPs) based on soft X-ray spectroscopy in the gas phase using synchrotron radiation. To understand the interfacial properties between water and TiO2 surface, a water shell was adsorbed at the surface of TiO2 NPs. We used two different ways to control the hydration level of the NPs: in the first scheme, initially solvated NPs were dried and in the second one, dry NPs generated thanks to a commercial aerosol generator were exposed to water vapor. XPS was used to identify the signature of the water layer shell on the surface of the free TiO2 NPs and made it possible to follow the evolution of their hydration state. The results obtained allow the establishment of a qualitative determination of isolated NPs' surface states, as well as to unravel water adsorption mechanisms. This method appears to be a unique approach to investigate the interface between an isolated nano-object and a solvent over-layer, paving the way towards new investigation methods in heterogeneous catalysis on nanomaterials.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4604456PMC
http://dx.doi.org/10.1038/srep15088DOI Listing

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