Structural transformation of h-BN overlayers on Pt(111) in oxidative atmospheres. Issue 16 (9th April 2018)

• Record Type: Journal Article
• Authors: Meng, Caixia; Li, Yifan; Wu, Hao; Wei, Wei; Ning, Yanxiao; Cui, Yi; Fu, Qiang; Bao, Xinhe
• Is Part Of: Physical chemistry chemical physics. Volume 20:Issue 16(2018)
• Page Start: 11013
• Page End: 11020
• Publication Date: 2018-04-09
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/c8cp00877a
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : Controlled structural transformation of h-BN overlayers on Pt(111) in oxidative atmospheres including oxygen intercalation, formation of boron oxide, and oxygen etching. Abstract : Interaction of hexagonal boron nitride (h-BN) with gases is of great importance for its properties and applications. In the present work, the structural changes of h-BN overlayers on Pt(111) in oxidative atmospheres including O2 and NO2 have been investigated by using low energy electron microscopy, Auger electron spectroscopy, X-ray photoelectron spectroscopy (XPS), and near ambient pressure XPS. We find that h-BN islands can be intercalated by oxygen in 10 −6 Torr O2 at 200 °C, while oxygen intercalation of full layer h-BN around 200 °C requires near ambient pressure O2 (0.1 Torr) or such a strong oxidant as NO2 (10 −6 Torr). h-BN overlayers can be etched away in the gases at much high temperatures, e.g. 800 °C. Upon mild oxidation in O2 or NO2 at temperatures of 400–450 °C, h-BN is transformed to boron oxide (BO x ) overlayers, which can be converted back to h-BN by heating in NH3 at 800 °C.