Abstract
This chapter introduces complex opto-electronic behavior of nanodiamonds when they are in contact with surrounding materials. Kelvin probe force microscopy (KPFM) is used to show that surface potential of nanodiamonds is not uniform but depends on many factors such as substrate and probe material, nanodiamond surface termination, charge trapping, illumination, and adsorbed water. Special attention is devoted to practical aspects and methodology of the KPFM measurements of nanodiamonds and other nanoscale objects, in general. KPFM serves here also as a nanoscale tool for investigation of local charge exchange between the nanodiamonds and surroundings, which is shown to influence also their other physical properties such as photoluminescence, secondary electron emission, and photovoltage.
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