通过反应层辅助沉积法制备二氧化钛纳米颗粒并采用X射线光电子能谱和扫描隧道显微镜进行表征。

Formation of TiO2 nanoparticles by reactive-layer-assisted deposition and characterization by XPS and STM.

作者信息

Song Zhen, Hrbek Jan, Osgood Richard

机构信息

Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA.

出版信息

Nano Lett. 2005 Jul;5(7):1327-32. doi: 10.1021/nl0505703.

DOI:10.1021/nl0505703

PMID:16178232

Abstract

Stoichiometric TiO2 nanoparticles (1-5 nm) were prepared by reactive-layer-assisted deposition (RLAD), in which Ti was initially deposited on a multilayer of H2O (or NO2) on a Au(111) substrate at approximately 90 K. The composition and atom-resolved structure of the nanoparticles were studied by XPS and STM. The approximately 5 nm TiO2 particles had either a rutile or anatase phase with various crystal facets. STS of the nanoparticles suggests size-dependent electronic structure. These well-defined nanoparticles can be used in molecular-level studies of the reactions and mechanisms of photocatalytic processes on TiO2 nanoparticle surfaces.

摘要

通过反应层辅助沉积（RLAD）制备了化学计量比的二氧化钛纳米颗粒（1-5纳米），其中钛最初在约90K的温度下沉积在金（111）衬底上的多层水（或二氧化氮）上。通过X射线光电子能谱（XPS）和扫描隧道显微镜（STM）研究了纳米颗粒的组成和原子分辨结构。大约5纳米的二氧化钛颗粒具有金红石或锐钛矿相以及各种晶面。纳米颗粒的扫描隧道谱（STS）表明其电子结构与尺寸有关。这些定义明确的纳米颗粒可用于二氧化钛纳米颗粒表面光催化过程的反应和机理的分子水平研究。