在高度有序的热解石墨上通过原子层沉积生长 Pt 纳米线。

Growth of Pt nanowires by atomic layer deposition on highly ordered pyrolytic graphite.

机构信息

Department of Chemical Engineering, Stanford University, Stanford, California 94305, USA.

出版信息

Nano Lett. 2013 Feb 13;13(2):457-63. doi: 10.1021/nl303803p. Epub 2013 Jan 14.

Abstract

The formation of Pt nanowires (NWs) by atomic layer deposition on highly ordered pyrolytic graphite (HOPG) is investigated. Pt is deposited only at the step edges of HOPG and not on the basal planes, leading to the formation of laterally aligned Pt NWs. A growth model involving a morphological transition from 0-D to 1-D structures via coalescence is presented. The width of the NWs grows at a rate greater than twice the vertical growth rate. This asymmetry is ascribed to the wetting properties of Pt on HOPG as influenced by the formation of graphene oxide. A difference in Pt growth kinetics based on crystallographic orientation may also contribute.

摘要

采用原子层沉积法在高定向热解石墨（HOPG）上制备 Pt 纳米线（NWs）。Pt 仅在 HOPG 的台阶边缘沉积，而不在基面沉积，从而导致 Pt NWs 侧向对齐。提出了一个涉及通过聚合并从 0-D 结构到 1-D 结构的形态转变的生长模型。NWs 的宽度以大于垂直生长速率两倍的速率生长。这种不对称性归因于 Pt 在 HOPG 上的润湿性，这受到氧化石墨烯形成的影响。基于晶体取向的 Pt 生长动力学的差异也可能有贡献。