期刊
MATERIALS TODAY COMMUNICATIONS
卷 38, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.mtcomm.2023.107643
关键词
R-Boron nitride; Needle-like morphology; Low-temperature synthesis; Urea; H-Boron nitride
In this study, h-BN and r-BN structures were synthesized through controlled nitridation. The h-BN exhibited sheet-like morphology, while the r-BN formed needle-like hollow structures.
While a variety of techniques have been applied to prepare h-BN powders of different morphology, only a few rBN synthesis methods are presented. In this study, the h-BN structures have been synthesized through controlled nitridation at temperatures lower than 950 degrees C. First, a precursor was prepared at 65 degrees C from boric acid and urea, making huge bubbles of B-N-C and flattened at higher temperatures. However, r-BN hollow needle-shaped structures were formed from these h-BN nanosheets by thermal shock-based heat treatment, where the flattening process stopped and sheets rolled. The as-synthesized samples were analyzed by X-ray diffraction (XRD), Fourier transformation infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM), simultaneous thermal analysis (STA: thermogravimetric (TGA), and differential thermal analysis (DTA)), transmission electron microscopy (TEM), and Brunauer-Emmett-Teller (BET) techniques. The h-BN nanosheets are about 500 nm thick, while needle-type structures are approximately 0.88-17 mu m long. The specific surface area of mesoporous nanosheets and needle-like hollow r-BN mesoporous structures is 358 and 75 m2/g, respectively. In this research, h-BN and r-BN are synthesized in sheet-like and needle-like morphologies, respectively.
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