Hashimoto Ayako, Takeguchi Masaki
Surface Physics and Structure Unit, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Japan.
J Electron Microsc (Tokyo). 2012;61(6):409-13. doi: 10.1093/jmicro/dfs060. Epub 2012 Sep 4.
To study their thermal stability, we observed Pt colloidal nanoparticles on terraced graphene layers at high temperatures using aberration-corrected transmission electron microscopy. Not only Pt nanoparticles but also single Pt atoms were formed on the graphene layers by heating Pt colloids to 500-800°C. High resolution in situ observation showed that Pt nanoparticles and single atoms anchored to the edge of the graphene layers were relatively stationary under elevated temperatures, although some Pt atoms migrated on the graphene surfaces. The results indicated that the Pt single atoms at the edge of the graphene exhibited high-temperature stability.
为了研究它们的热稳定性，我们使用像差校正透射电子显微镜在高温下观察了梯田状石墨烯层上的铂胶体纳米颗粒。通过将铂胶体加热到500-800°C，不仅在石墨烯层上形成了铂纳米颗粒，还形成了单个铂原子。高分辨率原位观察表明，尽管一些铂原子在石墨烯表面迁移，但锚定在石墨烯层边缘的铂纳米颗粒和单个原子在高温下相对稳定。结果表明，石墨烯边缘的铂单原子表现出高温稳定性。
