Synthesis of Turbostratic Boron Nitride: Effect of Urea Decomposition

Abstract

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.

Adsorption of uranium (VI) from aqueous solutions using boron nitride/polyindole composite adsorbent

“…Figure S2 belongs to Raman spectra of the tBN, PIn and tBN/PIn. The major scattering peak at 1373 cm −1 was characteristic vibrational mode for tBN 37,38 . For PIn, the broad peaks centered at 1335 cm −1 (C−N stretching vibrations), and 1565 cm −1 (C=N stretching vibrations) were noticed.…”

“…The major scattering peak at 1373 cm À1 was characteristic vibrational mode for tBN. 37,38 For PIn, the broad peaks centered at 1335 cm À1 (CÀN stretching vibrations), and 1565 cm À1 (C=N stretching vibrations) were noticed. tBN/PIn exhibited a major peak at 1356 cm À1 belong to BN component, and minor and weaker peaks at 1544 and 1613 cm À1 belong to PIn component, respectively.…”

First synthesis of 2D materials by hypergolic reactions and evaluation of their dispersions for ink formulation: hexagonal boron nitride and fluorinated carbon nanosheets

“…XRD shows a main peak at 26.4°that corresponds to the characteristic (002) reflection h-BN as well as a smaller one between 40-45°due to the (100) reflection [4,5,30,31] (figure 1(a)). The corresponding interlayer distance d 002 is 0.34 nm, i.e., slightly higher than that of highly crystalline h-BN (d 002 = 0.33 nm) [32].…”

Mesoporous boron nitride in contact with water - Chemical stability and adsorption properties

“…In this work, we utilized a pre-heating method previously described by Jähnichen et al [21]. This method yields mainly mesoporous t-BN which exhibits much higher water stability than previously reported microporous t-BN materials.…”

“…While melamine-based BN is primarily microporous, nitrogen precursors such as biuret or urea lead to the formation of micro-and mesopores [22]. Using urea as a nitrogen precursor and controlling its decomposition by adding a pre-heating step we were able to synthesize a highly mesoporous BN material with nearly no microporosity and high crystallinity [21]. The chemical durability of the synthesized mesoporous BN and a micro-mesoporous BN reference sample are compared regarding their stability in different environments: air, gaseous water (referred to as vapor), and liquid water (referred to as water).…”