EFFECT OF STRAIN ON SURFACE ELECTRONIC PROPERTIES OF MXENES
Abstract
MXenes are an emerging class of materials with an attractive combination of physical and electrical properties making them suitable for next-generation applications of interest to the U.S. Air Force such as electromagnetic interference shielding and wearable electronics. However, realizing the potential of MXenes for such applications requires a fundamental understanding how strain affects their surface electronic properties. This goal will be pursued in the proposed project by integrating conductive atomic force microscopy (C-AFM) experiments and multi-scale modeling of the model MXene Mo2C and its oxygenated form. Electronic properties including local density of states (LDOS) and conductivity will be correlated with strain induced three different ways: (i) due to (near-)surface defects (vacancies, adatoms, and interstitials), (ii) at or near wrinkles formed by placing MXenes on pre-stretched elastomeric substrates, and (iii) generated in response to the nanoscale contact between the C-AFM probe and the MXene surface. This third approach will enable testing of the possibility of using strain to tune local surface electronic properties in a reversible fashion. Current vs. voltage spectroscopy measurements will provide local information on conductivity and LDOS, and the experiments will be complemented by a range of modeling approaches (including continuum calculations, molecular dynamics simulations, and ab initio density functional theory calculations) to understand the relationship between strain and surface electronic properties. The body of knowledge that will be attained through this project will lay the groundwork for the realization of flexible electronic components and devices based on MXenes for next-generation applications.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 20, 2023
- Source ID
- FA95502210418
Entities
People
- Mehmet Z. Baykara
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of California