4.8 Article

Facet-Dependent Surface Charge and Hydration of Semiconducting Nanoparticles at Variable pH

期刊

ADVANCED MATERIALS
卷 33, 期 52, 页码 -

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202106229

关键词

atomically resolved images; atomic force microscopy; facet-dependent surface charges; faceted semiconducting SrTiO; (3) nanoparticles; hydration structures; nanoparticles; semiconductor electrolyte interfaces

资金

  1. NWO grant [Mat4Sus 680.M4SF.026]

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This study utilized dual scale atomic force microscopy to measure electrostatic and hydration forces of faceted semiconducting SrTiO3 nanoparticles in aqueous electrolyte, revealing facet-dependent surface charges and a microscopic charge generation mechanism that explains colloidal scale electrostatic forces.
Understanding structure and function of solid-liquid interfaces is essential for the development of nanomaterials for various applications including heterogeneous catalysis in liquid phase processes and water splitting for storage of renewable electricity. The characteristic anisotropy of crystalline nanoparticles is believed to be essential for their performance but remains poorly understood and difficult to characterize. Dual scale atomic force microscopy is used to measure electrostatic and hydration forces of faceted semiconducting SrTiO3 nanoparticles in aqueous electrolyte at variable pH. The following are demonstrated: the ability to quantify strongly facet-dependent surface charges yielding isoelectric points of the dominant {100} and {110} facets that differ by as much as 2 pH units; facet-dependent accumulation of oppositely charged (SiO2) particles; and that atomic scale defects can be resolved but are in fact rare for the samples investigated. Atomically resolved images and facet-dependent oscillatory hydration forces suggest a microscopic charge generation mechanism that explains colloidal scale electrostatic forces.

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