期刊
ACS NANO
卷 8, 期 6, 页码 5441-5448出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn5007804
关键词
vapor-liquid-solid (VLS); solid-liquid-vapor (SLV); nanowire; in situ TEM; semiconductor; nanoelectronics; rutile; tin dioxide
类别
资金
- NASA Kentucky Space Program
- NASA Kentucky EPSCoR Program
- Office of Basic Energy Sciences, Materials Sciences and Engineering Division, U.S. Department of Energy
- Kentucky NSF EPSCoR program through the Center of Advanced Materials
- ORNL's Center for Nanophase Materials Sciences (CNMS)
- Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy
- Office Of The Director
- EPSCoR [0814194] Funding Source: National Science Foundation
The well-known vapor-liquid-solid (VLS) mechanism results in high-purity, single-crystalline wires with few defects and controllable diameters, and is the method of choice for the growth of nanowires for a vast array of nanoelectronic devices. It is of utmost importance, therefore, to understand how such wires interact with metallic interconnects-an understanding which relies on comprehensive knowledge of the initial growth process, in which a crystalline wire is ejected from a metallic particle. Though ubiquitous, even in the case of single elemental nanowires the VLS mechanism is complicated by competing processes at multiple heterogeneous interfaces, and despite decades of study, there are still aspects of the mechanism which are not well understood. Recent breakthroughs in studying the mechanism and kinetics of VLS growth have been strongly aided by the use of in situ techniques, and would have been impossible through other means. As well as several systematic studies of nanowire growth, reports which focus on the role and the nature of the catalyst tip reveal that the stability of the droplet is a crucial factor in determining nanowire morphology and crystallinity. Additionally, a reverse of the VLS process dubbed solid-liquid-vapor (SLV) has been found to result in the formation of cavities, or negative nanowires. Here, we present a series of heating studies conducted in situ in the transmission electron microscope (TEM), in which we observe the complete dissolution of metal oxide nanowires into the metal catalyst particles at their tips. We are able to consistently explain our observations using a solid-liquid-vapor (SLV) type mechanism in which both evaporation at the liquid-vapor interface and adhesion of the catalyst droplet to the substrate surface contribute to the overall rate.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据