用于功能性氮化物纳米复合材料的硅氮化物中钴的低温形成。

Low temperature formation of cobalt in silicon nitride toward functional nitride nanocomposites.

作者信息

Tada Shotaro, Mallmann Maira Debarba, Takagi Haruna, Iihama Junya, Asakuma Norifumi, Asaka Toru, Daiko Yusuke, Honda Sawao, Nishihora Rafael Kenji, Machado Ricardo Antonio Francisco, Bernard Samuel, Iwamoto Yuji

机构信息

Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan.

University of Limoges, CNRS, IRCER, UMR 7315, Limoges, F-87000, France and Chemical Engineering, Federal University of Santa Catarina, Florianópolis, 88010-970, Brazil.

出版信息

Chem Commun (Camb). 2021 Feb 25;57(16):2057-2060. doi: 10.1039/d0cc07366k.

DOI:10.1039/d0cc07366k

PMID:33507185

Abstract

This work highlights the first demonstration of a low-temperature in situ formation of Co nanocrystallites embedded within an amorphous silicon nitride matrix through careful control of the chemistry behind material design using perhydropolysilazane (PHPS) as a Si3N4 precursor further coordinated with CoCl2 and ammonia as a pyrolysis atmosphere. The Co nucleation was allowed to proceed at temperatures as low as 400 °C via thermal decomposition of Co2N pre-formed in situ by the reaction of CoCl2 with the Si centers of PHPS at the early stage of pyrolysis (220-350 °C).

摘要

这项工作首次展示了通过使用全氢聚硅氮烷（PHPS）作为Si3N4前驱体，并进一步与CoCl2和氨气作为热解气氛进行配位，在材料设计背后的化学过程进行仔细控制，从而在低温下原位形成嵌入非晶硅氮化物基体中的Co纳米晶体。通过在热解早期（220-350°C）使CoCl2与PHPS的Si中心反应原位预形成的Co2N进行热分解，Co成核得以在低至400°C的温度下进行。