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High Aspect Ratio Au/Ni Coaxial Nanorod Arrays for Biosensing Applications

[+] Author Affiliations
Che-Wei Hsu, Gou-Jen Wang

National Chung-Hsing University, Taichung, Taiwan

Paper No. DETC2013-12869, pp. V001T09A003; 7 pages
  • ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 1: 15th International Conference on Advanced Vehicle Technologies; 10th International Conference on Design Education; 7th International Conference on Micro- and Nanosystems
  • Portland, Oregon, USA, August 4–7, 2013
  • Conference Sponsors: Design Engineering Division, Computers and Information in Engineering Division
  • ISBN: 978-0-7918-5584-3
  • Copyright © 2013 by ASME


In this study, a novel fabrication method for high aspect ratio magnetic Au/Ni coaxial nanorod arrays is proposed. It is expected that the stiffness of the gold shell could be supported by the core nickel rod. Furthermore, a magnetic force can be employed to manipulate the motion of the coaxial nanorod arrays. The fabrication procedures include: AAO template preparation, working electrode coating, nickel electrodeposition, alumina etching, and gold-plating by an electroless nickel immersion gold (ENIG) process.

Experimental results demonstrated that the proposed method in this study could synthesize high aspect ratio magnetic Au/Ni coaxial nanorod arrays. The height of the synthesized coaxial nanorods is about 65.3 μm and the diameter of each nanorod is around 0.225 μm. Hence the aspect ratio is 290. The Au/Ni coaxial nanorod array was further used as a biosensor for the detection of glucose. The sensitivity of the proposed glucose biosensor was 225 μA/(mM·cm2) with a linear detection range of 27.5 μM to 1.38 mM. The sensitivity of the proposed Au/Ni coaxial nanorod array for glucose detection is the best among the reported works.

Copyright © 2013 by ASME
Topics: Nanorods



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