Abstract
We present an experimental platform which combines spectroscopic capabilities with time-resolved measurements of effective surface charge at solid-liquid interfaces. Silica microspheres, pristine and coated with various organic semiconductor molecules, were optically trapped either in water or in toluene. Adsorption of organic semiconductor molecules on the microspheres was observed via appearance of fluorescence and dramatic reduction in the effective surface charge, measured concurrently on individual spheres, with elementary charge resolution. The versatile platform accommodates possibilities to study a variety of photoinduced processes simultaneously with measurements of surface charge and can be incorporated in devices such as microreactors and microfluidics.
Highlights
Processes occurring at solid-liquid interfaces are of critical importance for a variety of applications spanning diverse fields including geochemistry, environmental science, catalysis, solar energy, corrosion protection, and many others [1]
We combine a highly-sensitive method to measure surface charge on microscopic particles suspended in various environments with a capability to concurrently perform spectroscopy on the same particles, which enables time-resolved measurements of surface charge evolution and energy transfer processes under photoexcitation
We demonstrate simultaneous surface charge and fluorescence measurement from micron-sized silica spheres coated with physisorbed fluorescent organic semiconductor molecules and their blends, suspended in different environments
Summary
Processes occurring at solid-liquid interfaces are of critical importance for a variety of applications spanning diverse fields including geochemistry, environmental science, catalysis, solar energy, corrosion protection, and many others [1]. Examples of such processes include interactions involving (dis)charging of colloids [2,3,4,5,6,7,8], physisorption and chemisorption [9,10,11,12], (electro)chemical reactions, and photocharging [13], all of which involve evolution of the effective surface charge. We demonstrate simultaneous surface charge and fluorescence measurement from micron-sized silica spheres coated with physisorbed fluorescent organic semiconductor molecules and their blends, suspended in different environments
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