Is Small Perfect? Size Limit to Defect Formation in Pyramidal Pt Nanocontacts
Varlei Rodrigues, Fernando Sato, Douglas S. Galvao, and Daniel Ugarte
TL;DR
This study combines microscopy and calculations to identify a size limit for defect formation in platinum nanocontacts, revealing how defects influence electron transmission.
Contribution
It introduces a size-dependent defect formation limit in Pt nanocontacts, combining experimental and theoretical approaches to understand defect behavior.
Findings
Defects are present but restricted away from the tip axes.
A size limit exists for twin defect formation in Pt nanocontacts.
Defects can affect electron transmission properties.
Abstract
We report high resolution transmission electron microscopy and ab initio calculation results for the defect formation in Pt nanocontacts (NCs). Our results show that there is a size limit to the existence of twins (extended structural defects). Defects are always present but blocked away from the tip axes. The twins may act as scattering plane, influencing contact electron transmission for Pt NC at room temperature and Ag/Au NC at low temperature.
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