We have successfully prepared Kompeito-like platinum particles by hydrogen reduction of Pt4+ in the presence of sodium polyacrylate. We performed In Situ TEM observation of these platinum particles at high temperatures. At 300 °C, a thin carbon layer due to polyacrylate
formed on the particle surface. The detailed structure of the particles did not change with temperatures up to 700 °C. Continuous heating up to 800 °C blunted the particles' edges and also sintering of the particles was observed. This result strongly indicates that the shape change
and sintering of platinum particles are exclusively controlled by the carbon layer, which is generated from a surface stabilizer polymer.
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