Wang Nannan, Yang Zhuxian, Xu Fang, Thummavichai Kunyapat, Chen Hongmei, Xia Yongde, Zhu Yanqiu
College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, EX4 4QF, United Kingdom.
Faculty of Engineering, the University of Nottingham, Nottingham, NG7 2RD, United Kingdom.
Sci Rep. 2017 Sep 19;7(1):11829. doi: 10.1038/s41598-017-12200-1.
A versatile Rotary Chemical Vapour Deposition (RCVD) technique for the in-situ synthesis of large scale carbon-coated non-magnetic metal oxide nanoparticles (NPs) is presented, and a controllable coating thickness varying between 1-5 nm has been achieved. The technique has significantly up-scaled the traditional chemical vapour deposition (CVD) production for NPs from mg level to 10 s of grams per batch, with the potential for continuous manufacturing. The resulting smooth and uniform C-coatings sheathing the inner core metal oxide NPs are made of well-crystallised graphitic layers, as confirmed by electron microscopy imaging, electron dispersive spectrum elemental line scan, X-ray powder diffractions and Raman spectroscopy. Using nylon 12 as an example matrix, we further demonstrate that the inclusion of C-coated composite NPs into the matrix improves the thermal conductivity, from 0.205 W∙m∙K for neat nylon 12 to 0.305 W∙m∙K for a 4 wt% C-coated ZnO composite, in addition to a 27% improvement in tensile strength at 2 wt% addition.
本文介绍了一种用于原位合成大规模碳包覆非磁性金属氧化物纳米颗粒（NPs）的通用旋转化学气相沉积（RCVD）技术，并且已经实现了1-5nm之间可控的涂层厚度。该技术显著扩大了传统化学气相沉积（CVD）法生产纳米颗粒的规模，从毫克级提高到每批几十克，具有连续制造的潜力。通过电子显微镜成像、电子色散光谱元素线扫描、X射线粉末衍射和拉曼光谱证实，包裹在内核金属氧化物纳米颗粒上的碳涂层光滑且均匀，由结晶良好的石墨层组成。以尼龙12为例，我们进一步证明，将碳包覆复合纳米颗粒加入到基体中，除了在添加量为2wt%时拉伸强度提高27%外，还能将热导率从纯尼龙12的0.205W∙m∙K提高到4wt%碳包覆氧化锌复合材料的0.305W∙m∙K。
