journal article·2021-04-23Open access

One-Step Conversion of Graphite to Crinkled Boron Nitride Nanofoams for Hydrophobic Liquid Absorption

Thang Pham, Scott Stonemeyer, James Marquez, Hu Long, S. Matt Gilbert, Marcus Worsley, Alex Zettl

ACS Applied Nano Materials· Volume 4· Issue 4

Abstract

We describe a robust and scalable method to produce crinkled hexagonal boron nitride (h-BN) nanofoam from graphite in a single-step, leapfrog-like process. The conversion is based on carbothermic reduction and simultaneous nitrogenization of boron oxide and graphite. High-resolution transmission electron microscopy and electron diffraction demonstrate that the final converted h-BN nanofoam is crystalline at the atomic scale but has substantial crinkling of the h-BN sheets at the nanoscale. It also supports a dense network of nanometer-sized pores throughout. The operative conversion mechanism from flat carbon precursors to crinkled boron nitride sheets is proposed. Crinkled h-BN nanofoam shows a surface area over 60 times larger, as compared to the graphitic scaffold, leading to improved oil absorption capabilities (up to 325 wt %).
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Research context

OpenAlex topics: Graphene research and applications · Solar-Powered Water Purification Methods · Surface Modification and Superhydrophobicity

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Affiliations

Department of Physics, University of California at Berkeley, Berkeley, California 94720, United States

Department of Materials Science and Engineering, University of California at Berkeley, Berkeley, California 94720, United States

Department of Chemistry, University of California at Berkeley, Berkeley, California 94720, United States

Kavli Energy NanoSciences Institute, University of California at Berkeley, Berkeley, California 94720, United States

Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550, United States

Funding

Lawrence Livermore National Laboratory · Basic Energy Sciences · National Science Foundation

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