期刊
NANO
卷 9, 期 1, 页码 -出版社
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S1793292014500027
关键词
Hexagonal boron nitride; acoustic irradiation; sonochemistry; bandgap engineering; conductive h-BN; TOF-SIMS; partial oxidization of h-BN (PO-hBN)
By acoustically irradiating pristine, white, electrically insulating h-BN in aqueous environment we were able to invert its material properties. The resulting dark, electrically conductive h-BN (referred to as partially oxidized h-BN or PO-hBN) shows a significant decrease in optical transmission (>60%) and bandgap (from 5.46 eV to 3.97 eV). Besides employing a wide variety of analytical techniques (optical and electrical measurements, Raman spectroscopy, SEM imaging, EDS, X-Ray diffraction, XPS and TOF-SIMS) to study the material properties of pristine and irradiated h-BN, our investigation suggests the basic mechanism leading to the dramatic changes following the acoustic treatment. We find that the degree of inversion arises from the degree of h-BN surface or edge oxidation which heavily depends on the acoustic energy density provided to the pristine h-BN platelets during the solution-based process. This provides a facile avenue for the realization of materials with tuned physical and chemical properties that depart from the intrinsic behavior of pristine h-BN.
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