This paper describes the surface topography characteristics of the (100) and (101) faces of potassium dihydrogen
phosphate (KDP) crystals by using atomic force microscopy (AFM) for nanoscale observation. Fractal dimensions of the surface
pattern were measured, including step height and terrace distance of KDP crystals under different supersaturation levels and dye
concentrations, and the relationship between dye concentration and surface structure was examined.
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