Surface modification of metal nanoparticles by high energy ion beam for applications to fuel-cell catalysts

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Metal nanoparticles were prepared on a glassy carbon plate by a sputtering method and then irradiated with high energy ion beams at room temperature. The nanoparticles would be modified by 0.38 MeV proton (H^+) beam-induced electronic excitation so that they have a higher surface activity. The mechanism of this irradiation effect seems to be rather complicated, but it can be discussed in relation to a change in the interfacial crystal structure during the irradiation.