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TEM images of Pt nanoparticles on CNTs loaded by using microwave treatment: (a) the pristine MWCNTs, (b) the oxidized MWCNTs with oxidizing agent, and [(c)–(g)] Pt nanoparticles loaded on various defective nucleation sites.
Raman spectra using an excitation energy of for (a) the pristine MWCNTs without Pt loading, (b) oxidized MWCNTs without Pt loading, (c) microwave-treated MWCNTs for Pt loading of , and (d) microwave-treated MWCNTs for Pt loading of .
(a) values (ratio of areal intensity of the band to the band) for MWCNTs and (002) peak intensity as a function microwave exposure time and (b) Pt loading amount determined from TGA as a function microwave exposure time.
Optimized geometries and adsorption energies of Pt atom on various defect states, obtained by density functional calculations: (a) pure CNT, (b) Stone-Wales CNT, (c) vacancy CNT, (d) oxidized pure CNT, and (e) oxidized vacancy CNT. Energies and bond lengths are in units of eV and Å. The strained C–C, C–Pt, and C–O bond lengths were indicated in units of Å. The insets indicate the side views of the geometries.
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