Proton irradiation effects on thermal transport in individual single-crystalline Bi nanowires

Authors


Corresponding author: e-mail wooyoung@yonsei.ac.kr, Phone: +82 2 2123 2834, Fax: +82 2 312 5375

e-mail jinseonoh@gachon.ac.kr, Phone: +82 2 2123 7802, Fax: +82 2 312 5375

Abstract

We investigated the proton irradiation effect of thermal conductivities for individual single-crystalline Bi nanowires grown by the on-film formation of nanowires (ON–OFF). The thermal conductivities of Bi nanowires with diameter of 154 and 112 nm were measured using suspended devices before and after proton irradiation, respectively. It was founded thermal conductivities of Bi nanowires appreciably decrease after proton irradiation, which was caused by the destruction of single-crystallinity due to the high-energy proton impingement. This result indicates the defects of Bi nanowires created by proton drastically limit the mean free paths of phonons, resulting in the change of thermal transport of Bi nanowires.

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