Study of one-step pyrolysis porous boron nitride with large specific surface area

Xu, Xiaodan; Wang, Yanxiang; Wang, Yuxia; Fu, Shan-long; Wang, Chengguo; Yang, Yourong; Wang, Yongbo; Zhuang, Guangshan

doi:10.1016/j.vacuum.2020.109769

Cited by 8 publications

(2 citation statements)

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“…Four different pre-heating temperatures that are close to or within the decomposition range of the precursors were used. Here, 100, 200, 300, and 400 °C were chosen because they are commonly known from previous works of melamine-based BN. ,− The sample BN-100/2 is pre-heated before any decomposition should occur. The samples BN-200/2 and BN-300/2 are pre-heated within the precursor decomposition of urea and boric acid, and BN-400/2 is pre-heated after the nitrogen precursor is entirely decomposed.…”

Section: Resultsmentioning

confidence: 99%

“…In this study, the influences of different pre-heating temperatures of 100, 200, 300, and 400 °C and pre-heating times of 2, 4, 6, and 8 h on the synthesis and subsequent properties of t-BN are discussed. While pre-heating steps are commonly known for melamine-based BN, ,− a profound understanding is still lacking for urea-based BN due to its complex decomposition mechanism (Figure S1). In our work, urea is chosen as the nitrogen precursor due to its disposition to form a BN product with a high amount of mesopores.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Turbostratic Boron Nitride: Effect of Urea Decomposition

et al. 2022

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Since the recent discovery of the template-free synthesis of porous boron nitride, research on the synthesis and application of the material has steadily increased. Nevertheless, the formation mechanism of boron nitride is not yet fully understood. Especially for the complex precursor decomposition of urea-based turbostratic boron nitride (t-BN), a profound understanding is still lacking. Therefore, in this publication, we investigate the influence of different common pre-heating temperatures of 100, 200, 300, and 400 °C on the subsequent properties of t-BN. We show that the structure and porosity of t-BN can be changed by preheating, where a predominantly mesoporous material can be obtained. Within these investigations, the sample BN-300/2 depicts the highest mesopore surface area of 242 m 2 g –1 with a low amount of micropores compared to other BNs. By thermal gravimetric analysis, X-ray photoelectron spectroscopy, and Raman spectroscopy, valid details about the formation of intermediates, types of chemical bonds, and the generation of t-BN are delivered. Hence, we conclude that the formation of a mesoporous material arises due to a more complete decomposition of the urea precursor by pre-heating.

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