将非范德瓦尔斯固体转化为二维过渡金属化物
Zhiguo Du1, Shubin Yang2, Songmei Li1
1Key Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing, China.
Nature
|January 24, 2020
概括
研究人员开发了一种新方法,从非范德瓦尔斯固体中制造相控二维 (2D) 过渡金属化物. 这种方法可以为各种应用提供高通量稳定二维材料的合成.
科学领域:
- 材料科学
- 固态化学
- 纳米技术
背景情况:
- 合成二维 (2D) 原子层,如过渡金属化物已经确立,但实现相控仍然是一个重大挑战.
- 目前的剥离和蒸汽阶段生长等方法往往无法精确控制得到的二维晶体结构.
- 控制相位的能力 (例如,2H或1T) 对于定制材料属性至关重要.
研究的目的:
- 开发一个有效和通用的合成策略,用于控制相位的二维过渡金属化物.
- 允许生产具有特定晶体相的稳定,高质量的单层.
- 在这些工程二维材料中探索异原子替代的潜力.
主要方法:
- 一种新型的转化策略,涉及逐步将非范德瓦尔斯固体转化为二维范德瓦尔斯过渡金属素层.
- 在受控条件下,根据反应产品的和蒸气压力,将非vdW固体暴露在气蒸气中.
- 在过渡金属化物框架内证明异构原子替代 (例如,Y,P).
主要成果:
- 成功合成可控制的2H (三角晶体) 和1T (八面体) 阶段的2D过渡金属化物.
- 为合成的二维材料实现高温稳定性 (高达1373K).
- 证明了高吞吐量单层的生产和成功的异质原子替代.
结论:
- 开发的方法为工程阶段选择的二维过渡金属化物提供了通用和有效的方法.
- 这些材料具有出色的热稳定性,可以有效地生产.
- 合成的二维过渡金属化物对电子,催化和储能领域的应用具有显著的前景.
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