Surface Growth of Boron Nitride Nanotubes through Boron Source Design

Abstract

Boron nitride nanotubes (BNNTs) are promising materials due to their unique physical and chemical properties. Fabrication technologies based on gas‐phase reactions reduce the control and collection efficiency of BNNTs due to reactant and product dispersion within the reaction vessel. A surface growth method that allows for controllable growth of BNNTs in certain regions using a preburied boron source is introduced. This work leverages the high solubility of boron in metals to create a boronized layer on the surface which serves as the boron source to confine the growth of BNNTs. Dense and uniform BNNTs are obtained after loading catalysts onto the boronized substrate and annealing under ammonia. Confirmatory experiments demonstrate that the boride layer provides boron for BNNTs growth. Furthermore, the patterned growth of BNNTs is realized by patterning the boronizing region, demonstrating the controllability of this method. In addition, the Ni substrate with BNNTs growth exhibits better performance in corrosion resistance and thermal conductivity than pure Ni. This study introduces an alternative strategy for the surface growth of BNNTs based on boron source design, which offers new possibilities for the controllable preparation of BNNTs for various applications.

Strategic Fabrication of Robust Spherical Hexagonal Boron Nitride Particles for Thermally Conductive Applications

“…Given that the h-BN surface is terminated by N−H bonds to improve the dispersibility of h-BN particles in distilled water, it is necessary to replace the N−H bonds on the surface with N− OH bonds. 31 Analysis of the hydroxyl group at the surface of the h-BN flake was conducted as presented in Figure S2, Supporting Information. OH-BN showed a clear peak at 3500 cm −1 , which was attributed to the stretching vibration of the hydroxyl group (−OH).…”

“…Consequently, the number of particles in the center portion may be smaller than that of the droplet surface, leading to the formation of hollow or doughnut-shaped particles. , Therefore, to ensure uniformity in particle synthesis, it is imperative to improve the dispersibility of the particles in the solution. Given that the h-BN surface is terminated by N–H bonds to improve the dispersibility of h-BN particles in distilled water, it is necessary to replace the N–H bonds on the surface with N–OH bonds . Analysis of the hydroxyl group at the surface of the h-BN flake was conducted as presented in Figure S2, Supporting Information.…”

Bilayered Distribution of Ag and Fe3O4 in Electrospun TPU Films for Low-Reflection Electromagnetic Interference Shielding and Multiple Thermal Management Functionalities

“…It is possible to find that the η value increases with increasing electroless plating time, and the η value of the TPAF90 composite film is as high as 1000.9%. The increase in in-plane TC and the high η value of TPAF composite films are primarily attributed to the 3D interconnected network of Ag along the in-plane direction, which provides an efficient phonon transport pathway (Figure g) . Since the thermally conductive pathways in the vertical direction are not constructed, the through-plane TC of TPAF composite films slightly increases.…”

Growth methodologies of boron nitride nanotubes and their neutron shielding applications: a review

“…Zhou et al 109 introduced an innovative method for synthesizing BNNTs using a surface growth approach on a metal substrate (Fig. 9(a)).…”