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The feasibility of noncontact atomic force microscopy (NC-AFM) in single-molecule analysis is experimentally demonstrated. Carboxylates (RCOO - ) with different R's were identified molecule-by-molecule on the TiO 2 (110) substrate. The constant frequency-shift topography exhibited a good correlation with the physical topography of the carboxylates with R H, CH 3 , C(CH ...
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