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J. ChaeJ. Ha H. BaekY. Kuk S.Y. JungY.J. Song N.B. ZhitenevJ.A. Stroscio S.J. WooY.-W. Son 《Microelectronic Engineering》2011,88(7):1211-1213
Despite recent progress in understanding geometric structure, electronic structure, and transport properties in a graphene device (GD), role of point defects, edges, traps in a GD or a gate insulator has been poorly defined. We have studied electronic and geometric structures of these defects using scanning probe microscopy and try to link those with the transport properties of the GD. We perform scanning gate microscopy study to understand the local carrier scattering. It was found that geometric corrugations, defects and edges directly influence the local transport current. This observation is linked directly with a proposed scattering model based on macroscopic transport measurements. We suggest that dangling bonds in insulator-material SiO2 mainly used in GDs produce charge puddles and they work as scattering centers. 相似文献
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A combined redox-competition and negative-feedback SECM study of self-healing anticorrosive coatings
Y. González-García S.J. García A.E. Hughes J.M.C. Mol 《Electrochemistry communications》2011,13(10):1094-1097
In this paper, the long-term anticorrosive efficiency of a damaged self-healing coating is studied for the first time using scanning electrochemical microscopy (SECM). In the study an epoxy-coating with embedded-capsules containing a silyl-ester is employed. The properties of the silyl-ester as a healing-agent for the protection of AA2024-T3 were evaluated by complementary SECM experiments operating in negative-feedback and redox-competition modes. The experimental approach here presented allowed for monitoring the early-stages of corrosion activity and subsequent healing mechanisms offered by the release of silyl-ester into a relatively large coating defect. This result was observed by detecting the transition of the oxygen reduction response from a redox-competition mode to a negative-feedback behavior. These measurements demonstrated that the silyl-ester is released efficiently after capsules break upon coating damage, covering relatively large areas and gradually healing the damaged-site hindering the corrosion processes and providing an effective protection for at least one month of immersion in chloride solution. 相似文献
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