Oxidizable metals such as Al are found to become highly resistive when exposed to air in buckled state, > 10× resistance increase compared to that in flat configuration. On the other hand, noble metal and oxide conductor films, such as Au and indium tin oxide show negligible resistance increase. The enhanced oxidation of grain boundaries that are exposed to air when buckled is found to be responsible for the observed electromechanical stability. Simple yet effective method, i.e., thin capping layer of noble metal, to prevent the oxidation of non-noble metal is proposed and experimentally verified.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation (KRF) grant funded by the Korean government (MEST) ( 2009-0069209 ), WCU (World Class University) program ( R32-20031 ), and the Korea Institute of Machinery and Materials (KIMM) .
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Metals and Alloys
- Materials Chemistry