The sizes and surface morphologies of reduced Pt crystallites supported on three different graphitic substrates are examined with scanning tunneling microscopy (STM). The roughness of the substrates decreases the size of the catalyst crystallites without noticeable changes in morphology. Functionalization of the substrate with HNO3 results in considerable changes in both size and shape distribution of the supported catalysts. Crystallites supported on unfunctionalized graphites are rectangular parallelepiped with rounded corners, while those supported on functionalized NGHPG are more irregular in shape and more heterogeneous.
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Yeung et al. (1992) studied this question.
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