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INVERSION OF THE ELECTRICAL AND OPTICAL PROPERTIES OF PARTIALLY OXIDIZED HEXAGONAL BORON NITRIDE
AVINASH P. NAYAK,DEJI AKINWANDE,ANDREI DOLOCAN,JONGHO LEE,HSIAO-YU CHANG,TWINKLE PANDHI,MILO HOLT 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.1
By acoustically irradiating pristine, white, electrically insulating h-BN in aqueous environmentwe 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 signi¯cant decrease in opticaltransmission ( > 60%) and bandgap (from 5.46 eV to 3.97 eV). Besides employing a wide variety ofanalytical techniques (optical and electrical measurements, Raman spectroscopy, SEM imaging,EDS, X-Ray di®raction, XPS and TOF-SIMS) to study the material properties of pristine andirradiated h-BN, our investigation suggests the basic mechanism leading to the dramatic changesfollowing the acoustic treatment. We ¯nd 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 tothe pristine h-BN platelets during the solution-based process. This provides a facile avenue for therealization of materials with tuned physical and chemical properties that depart from the intrinsicbehavior of pristine h-BN.