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从纳米立方体到纳米棒和纳米线

Shaojun Guo¹, Andrew F Fidler¹, Kai He²

¹Center for Advanced Solar Photophysics, Chemistry Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States.

Journal of the American Chemical Society

|November 7, 2015

概括

研究人员开发了新方法来合成 Telluride (SnTe) 纳米晶体 (NC) 具有可调整的形状,包括立方体,纳米棒和纳米线. 这些无纳米材料对先进的电子设备具有前景.

科学领域:

材料科学
纳米技术
固态化学

背景情况:

狭半导体纳米晶体 (NC) 对于光伏等下一代电子产品至关重要.
锡化物 (SnTe) 的NC为传统的甲化物提供了无替代品.
之前的SnTeNC合成主要产生球形纳米粒子.

研究的目的:

开发用于形状控制的SnTeNC的新型合成策略.
探索SnTe纳米立方体,纳米棒 (NR) 和纳米线 (NW) 的合成.
研究SnTeNC形状演变的机制.

主要方法:

高温和低温的体合成.
传输电子显微镜 (TEM) 用于in-situ和ex-situ分析
在不同合成阶段的反应产品的表征.

主要成果:

从单分散纳米立方体到NR和NW实现了可调节的SnTeNC合成.
高温有利于热力学稳定的纳米立方体.
低温促进异构生长,导致NR和NW.

结论:

已经成功地证明了可调整形状的SnTeNCs的合成.
粒子间成熟是纳米立方体生长和形状聚焦的机制.
通过定向附着的粒子二元化可能会启动NR和NW的方向增长.

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