Effects of Strong Magnetic Processing on Orientation and Photoproperties of Gold Nanowires on a Substrate

Abstract

We have investigated the effect of magnetic processing on orientation of gold nanowires (AuNWs) using a strong magnetic field. The results in the extinction spectra due to surface plasmon and SEM images in the presence of magnetic processing (10 T) showed that the long axes of AuNWs in side-by-side aggregation of AuNWs were oriented perpendicular to the magnetic field. On the other hand, in the absence of magnetic processing, random orientation of the side-by-side aggregation of AuNWs was observed. The magnetic orientation of the aggregation is most likely attributable to the anisotropy in the magnetic susceptibilities of the pristine AuNWs.

Keywords:

• gold nanowire
• surface plasmon
• side-by-side aggregation
• magnetic orientation
• anisotropy
• magnetic susceptibilities

Acknowledgment

The authors are grateful to Professor Masahiro Hasuo (Kyoto University), Professor Nobuo Kimizuka (Kyushu University), and the Center of Advanced Instrumental Analysis, Kyushu University for the use of a superconducting magnet, and TEM and SEM apparatuses, respectively. The authors thank to Dr. Daigou Mizoguchi (Dai Nippon Toryo Co. Ltd.) for providing the AuNWs. The present study was supported by Grants-in-Aid for Challenging Exploratory Research (No. 25600006), and Nanotechnology Network Project (Kyushu-area Nanotechnology Network) from MEXT of Japan.