Three-dimensional foam-like hexagonal boron nitride nanomaterials via atmospheric pressure chemical vapor deposition

• Published in: Journal of materials science 2015-09, Vol.50 (18), p.6220-6226
• Main Authors: Ashton, Taylor S, Moore, Arden L
• Format: Article
• Language: English
• Subjects: Allotropy; Atmospheric pressure; Boron nitride; Ceramics; Characterization and Evaluation of Materials; Chemical vapor deposition; Chemistry and Materials Science; Classical Mechanics; Crystallography and Scattering Methods; Electron beams; energy; foams; graphene; Graphite; High temperature; Materials Science; Nanomaterials; Organic chemistry; Original Paper; Polymer Sciences; Raman spectroscopy; Solid Mechanics; Spectrum analysis; temperature; Thermal properties; Thermodynamic properties; vapors; X-ray diffraction
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-015-9180-0

Hexagonal boron nitride (h-BN) is a high temperature ceramic material with a graphite-like layered atomic arrangement and excellent basal-plane thermal conduction properties. Unlike graphite, however, h-BN is electrically insulating and possesses superior chemical stability, thereby making it attractive for many applications for which carbon allotropes are not suitable. In this work, freestanding three-dimensional foam-like h-BN nanomaterials tens of millimeters in size are realized by a low-cost atmospheric pressure chemical vapor deposition (APCVD) process. These three-dimensional foams were found to be ultralight with an effective density of 1.7 ± 0.6 mg/cm³. Strut wall thicknesses were observed to be 311 ± 82 nm, significantly thicker than reported in previous works using alternative CVD approaches. The samples were further analyzed using Raman spectroscopy, electron beam energy dispersive spectroscopy, and X-ray diffraction revealing the samples to exhibit characteristics consistent with h-BN. APCVD processes like the one presented here may provide a simple, scalable means of realizing ultralight hierarchical h-BN nanomaterials with tunable mechanical and thermal properties.