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The properties of 2D materials are highly susceptible to adsorbed gas species. Since surface interaction is very important due to large surface-to-volume ratio, understanding local molecular adsorption/desorption dynamics in these materials is very important. Previously, we have shown that THz emission from InP coated with graphene changes dramatically with O2 adsorption in the surface of graphene due to modification in the built-in surface field in the semiconductor.1 Here, we take advantage of this effect to quantify the binding energy of locally adsorbed O2 molecules in 2D materials like graphene and WS2 using laser terahertz (THz) emission microscopy.
© 2016 Japan Society of Applied Physics, Optical Society of America
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