17 September 2015
An OSU physicist is part of the international team who showed a mechanism for oxidation of black phosphorus. In collaboration with the team led by Salvador Barraza (U of Arkansas) and Alejandro Pacheco (U. del Norte, Colombia), Mario Borunda, Assistant Professor of Physics in the College of Arts and Sciences and expert in semiconductors, showed how phosphorene structures changes shape as it oxidizes. Black phosphorous is an allotrope of phosphorus. Phosphorene, a single layer of black phosphorous, was isolated and used to make electronic devices last year. Being a semiconductor, this new two-dimensional material is similar to graphene and could lead to future devices such as transistors. Yet, unlike graphene, phosphorene is unstable as it readily oxidizes and its degradation dynamics had been largely unknown. Using computational and theoretical techniques, it was found that oxygen molecules break-up near intrinsic defects such as dislocation lines and structural curvature which results in the breaking of the structure and degradation.
Intrinsic Defects, Fluctuations of the Local Shape, and the Photo-Oxidation of Black Phosphorus by Kainen L. Utt, Pablo Rivero, Mehrshad Mehboudi, Edmund O. Harriss, Mario F. Borunda, Alejandro A. Pacheco SanJuan, and Salvador Barraza-Lopez. ACS Central Science Article ASAP. DOI: 10.1021/acscentsci.5b00244.