The charged oxide aqueous interfaces are ubiquitous in the Earth crust, and involved in a huge variety of phenomena. Sum-frequency vibrational spectroscopy can access the interface <i>in situ</i> and have revealed crucial information about the interfacial water structures, however much remains unclear about the oxide surfaces. Here we utilized an oxide thin film with enhanced local field strength at the buried oxide water interface to enable <i>in situ</i> and direct probing of charged surface groups. The fused silica/water interface was chosen as a model system. The protonation and de-protonation processes were readily observed, providing new structural information of charged surface groups.

Lattice vibrations at charged oxide water interface probed by sum-frequency spectroscopy

ACS Fall 2020 Virtual Meeting

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