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Hexagonal boron nitride (h‐BN) nanosheets are attracting increased attention because of their excellent optical properties. Inspired by the natural exfoliation of seaside rocks, we propose a “chemical weathering” concept for fabricating h‐BN nanosheets from their bulk counterparts. We experimentally demonstrate that chemical weathering‐assisted exfoliation is a simple and efficient method for preparing h‐BN nanosheets. These nanolayers have a high solubility in water because of the hydroxylation of h‐BN (OH‐BNNS). Interestingly, the as‐prepared OH‐BNNSs exhibit excellent optical limiting properties with fascinating two‐photon absorption. It is a new and advanced optical material in the application of sensitive optical components, and shield human eyes from laser‐induced damage.
Zhao et al. (Mon,) studied this question.