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Switchable Friction across Insulator–Metal Transition in VO 2
Author(s) -
Singh Davinder,
Mittal Prashant,
Gosvami Nitya Nand,
Balakrishnan Viswanath
Publication year - 2019
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201900616
Subject(s) - materials science , insulator (electricity) , metal–insulator transition , raman spectroscopy , phase transition , composite material , metal , electrical resistance and conductance , phase (matter) , condensed matter physics , metallurgy , optics , organic chemistry , chemistry , physics
Significant friction turnover across the insulator to metal phase transition of VO 2 microcrystals as measured by friction force microscopy (FFM) and nanoscratch experiments is reported. Insulator to metal transition in chemical vapor deposition‐grown VO 2 platelet is confirmed by in situ Raman investigations and electrical resistance measurements that show more than four orders of magnitude change in electrical resistance across transition temperature. The coefficient of friction (COF) for the high‐temperature metallic phase, that is about two times higher than that of room‐temperature insulating phase, is demonstrated. To avoid temperature effects on friction, the friction of coexisting insulating and metallic phases at a constant temperature of ≈69 °C is measured. Additionally, the results also show that this twofold increase in COF is fully reversible when the phase transition is triggered by a heating–cooling cycle and can potentially be used as tuneable friction‐based gripping systems.