Temperature-Dependent Morphology Evolution of Boron Nitride and Boron Carbonitride Nanostructures

Abstract

Boron nitride (BN) and boron carbonitride (BCN) nanostructures with versatile morphology were synthesized at different temperatures. The morphologies such as smooth microspheres, nanoflake-decorated microspheres, solid nanowires, hollow nanotubes (bamboo-like nanotubes, quasi-cylindrical nanotubes, and cylindrical nanotubes), and nanosheet-assembled microwires have been observed. Systematic investigation showed that the reaction temperature was responsible for the versatile morphologies through influencing the guiding effect of catalyst alloy droplet and the diffusion rates of growth species. The diffusion rate differences between surface diffusion (along the surface of the droplet) and bulk diffusion (through the bulk of the droplet) at different reaction temperatures were suggested to affect the final structure of the BN and BCN nanostructures.

The Properties and Preparation Methods of Different Boron Nitride Nanostructures and Applications of Related Nanocomposites

“…In addition to the above-mentioned common methods for preparing BN, other methods can also be realized, such as wet chemical method (also called chemical liquid deposition (CLD)) [145] and solid state synthesis method, [146] which are extended by CVD method. Moreover, the high-energy electron radiation, [147] arc discharge [148] and laser heating methods [149] are relatively expensive and not commonly used.…”

Efficient Dynamic Computational Strategy for Heterogeneous Catalysis Based on Neural Network Potential Energy Surface: A Case Study of Temperature-Dependent Thermodynamics and Kinetics for the Chemisorbed on-surface CO

“…Notably, reaction temperature often plays a significant role in the activity as well as the selectivity for a catalytic reaction. [9][10][11][12][13] Accurate calculation of the temperature-dependent thermodynamics in catalysis is thus critical for revealing the correct molecular mechanism and further guiding the rational design of more efficient catalytic processes. However, the degree of deviation between the realistic conditions and ideal models should closely relate to the temperature, which makes the reliability of temperature-dependent thermodynamics from the common static computational approach be doubted.…”