SCALABLE SYNTHESIS OF NANOSTRUCTURED HEXAGONAL BORON NITRIDE AND PHASE CONTROL FOR CUBIC BORON NITRIDE UNDER LOW TEMPERATURE CONDITIONS
Abstract
To emulate the practical compatibility of nanostructured materials, facile synthesis and scalable fabrication (large lateral size) at low temperature has become an essential factor in advance to minimize manufacturing process and resources. Nanostructured boron nitride materials (hexagonal and cubic boron nitrides, BNs) have been a promising candidate for many macro- and micro-applications because of its superior thermal, chemical and mechanical stability. Also, c-BNs have recently revealed great scientific success as functional materials, which can lead to the great strides in increasing thermoelectricity, electromagnetic interference, and surface stability. However, qualitative and quantitative synthetic process of nanostructured BN materials with large lateral size (um ~ mm) is limited by the long synthesis time, severe heat-treatment process and high-pressure experiments. Uncertainty in direct phase transformation process from h-BN to c-BN are more pronounced, which have not been sufficiently studied due to their limited evaluation process. Therefore, this project is to develop novel synthetic pathways that make a breakthrough for nanostructured BN materials with large lateral size (over 100 um). The scientifically innovative point of this project is that (1) Controlling hydrodynamic forces and edge-functionalization by active sulphur and halogen precursors will lead to the breakdown of bulk BN powders to nanostructured BNs. (2) Investigating basic electrical transport, optical and dielectric properties of h-BN and c-BN will be carried out. (3) Introducing and characterizing polymorphic transformation of BNs at low temperature through ex-situ/in-situ technique will open up the fields for the use of BN materials in a much broader range of practical applications.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 20, 2023
- Source ID
- FA23862214040
Entities
People
- John Hong
Organizations
- Air Force Office of Scientific Research
- Kookmin University
- United States Air Force