Ultra-thin films of solution-exfoliated hexagonal boron nitride by Langmuir deposition

Abstract

Langmuir films of pure, solution-exfoliated hexagonal boron nitride, transferable to arbitrary substrates, are demonstrated as promising dielectric layers suitable for transparent and flexible optoelectronics.

Robust Nanocapacitors Based on Wafer-Scale Single-Crystal Hexagonal Boron Nitride Monolayer Films

“…21,22 This work aims to address the problems mentioned above. Many methods such as MBE, 23 CVD, 24 atomic layer deposition, 25 and solution-processed fabrication 26,27 have been adopted to obtain large-area h-BN films. Among these tools, MBE with precise control of growth parameters is an excellent candidate for epitaxial growth of high-quality films with atomic layer thicknesses, and thus, it is employed for h-BN growth in this project.…”

Hexagonal boron nitride exfoliation and dispersion

“…Sheets were obtained with a height of 2 to 14 nm, and they were used to produce thin films by Langmuir deposition. 28 In 2013, Mutz and coworkers performed a similar study to Coleman's, investigating the Hildebrand–Scatchard solution theory for various BN materials (BNNTs, functionalized-BNNTS (f-BNNTs), and hBN). 30 Their results found that ethyl acetate, methanol, and acetone are good solvents for the dispersion of hBN, although they did not fully match the predicted values (Hildebrand–Scatchard solution theory) for the material.…”

“…The earliest techniques used to achieve this were the use of common solvents, 22,23 functionalization with Lewis bases, 24,25 or the use of polymers. 26 For instance, many different solvents, including isopropanol (IPA), 27,28 N-methyl-2-pyrrolidone (NMP), 29 and tetrahydrofuran (THF) 30 have all been investigated for dispersing hBN. While these solvents are able to disperse hBN, they are not very effective at exfoliating large hBN crystals into few-layered sheets.…”