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

Abstract

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/cm 3 . 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.

Boron Nitride Nanostructures: Fabrication, Functionalization and Applications

“…It can completely recover its original shape after cyclic compression exceeding 70% (Figure b,c) with permittivity within 1.12 times that of air (Figure d), complementing the conductive properties of carbon and metal based ultralight materials . The thickness of the branch wall synthesized by this method is several nanometers, which can be significantly increased to hundreds of nanometers through ambient pressure CVD . Following our work, Loeblein et al fabricated 3D BN–C architecture via a two‐step growth of h‐BN and graphene on nickel template, separately .…”

Self-organized graphene-like boron nitride containing nanoflakes on copper by low-temperature N2 + H2 plasma

“…Each Raman spectrum in Fig. 4b shows the main peak at about 1369 cm À1 of h-BN, 9,18 which evidences that the main component of the fabricated nanostructure is the h-BN phase. Fig.…”

“…Since the discovery of the rst-ever real two-dimensional (2D) material, graphene, 2D lms 1 and metamaterials 2 have become frontmost structures for intensive fundamental and applied studies due to their unique physical, optical, and mechanical properties. 3,4 Hexagonal boron nitride (h-BN) sheets represent a novel graphene-like material featuring a set of unique properties 5,6 such as high thermal conductivity, structural stability and wide bandgap, which make it extremely promising for a wide range of applications 7 ranging from lubricants and transistors operating in harsh environments 8,9 to wear-resistant materials for acceleration channels of electric propulsion thrusters. 10,11 The 2D BNCO structure was recently designed on the basis of h-BN sheets and demonstrates exceptional composition-and bandgap-tunable properties, with potential extensive applications in many innovative areas including automotive engineering, light-emitting diodes, gas discharge systems, equipment for biological imaging and DNA labelling, etc.…”

“…12,17 When the 2D BNCO sheets are grown by the CVD method, a high (>1000 C) process temperature is used in line with expensive CH 4 , O 2 , Ar and BH 3 -NH 3 precursors, 8 thus the process is similar to that of fabricating h-BN sheets using BH 3 -NH 3 precursor. 9,18 Thus a new, fast, costefficient technique for the fabrication of hexagonal graphenelike boron nitride-based nanomaterials is vitally needed.…”

A Review on the Synergistic Features of Hexagonal Boron Nitride (White Graphene) as Adsorbent‐Photo Active Nanomaterial

“…3D h-BN foam. [43] AB/BNpowder 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 range of decomposition temperature for the formation of BN. The chemical reaction between various nitrogen-based gases derived from a primary precursor and H 3 BO 3 result in BN while the progressive gas generated from the secondary act as porogens at higher temperatures.…”