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Characterization of Microstructure and Composition of Fe-B Nanobars as Biosensor Platform

Published online by Cambridge University Press:  01 February 2011

Suiqiong Li ,
Liling Fu ,
Chongmin Wang ,
Scott Lea ,
Bruce Arey ,
Mark Engelhard  and
Z.-Y. Cheng
Suiqiong Li
Affiliation:
lisuiqi@auburn.edu, Auburn University, Auburn University, 275 Wilmore Labs,, Materials Research and Education Center, Auburn University, Auburn, AL, 36849, United States
Liling Fu
Affiliation:
fulilin@auburn.edu, Auburn University, Materials Research and Education Center, Auburn, AL, 36849, United States
Chongmin Wang
Affiliation:
chongmin.Wang@pnl.gov, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, WA, 99352, United States
Scott Lea
Affiliation:
scott.lea@pnl.gov, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, WA, 99352, United States
Bruce Arey
Affiliation:
bruce.arey@pnl.gov, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, WA, 99352, United States
Mark Engelhard
Affiliation:
mark.engelhard@pnl.gov, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, WA, 99352, United States
Z.-Y. Cheng
Affiliation:
chengzh@eng.auburn.edu, Auburn University, Materials Research and Education Center, Auburn, AL, 36849, United States
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Abstract

Individual magnetostrictive nanobars and arrays comprised of magnetostrictive nanobars were recently introduced as a high performance biosensor platform. In this paper, we report the fabrication and characterization of magnetostrictive nanobars based on Fe-B alloy. The nanobars were synthesized using a template-based electrochemical deposition method. The composition and microstructure of the Fe-B nanobars are directly related to their performance as a biosensor platform. The Fe-B nanobar arrays and individual nanobar were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), as well as Auger electron spectroscopy (AES). Morphologically, nanobars have a very flat top and a smooth cylindrical surface, which are critical factors for obtaining high performance as sensor platforms. Structurally, electron diffraction reveals that the Fe-B nanobars are amorphous. AES analysis indicates that Fe-B nanobars show no significant compositional variation along the length direction. It is found that the nanobars were covered by an oxidation layer of a typical thickness of ∼ 10 nm. It is believed that this oxidation layer is related to the passivation of nanobars in air. High temperature annealing and subsequent structural analysis indicate that the Fe-B nanobars possess a good thermal stability.

Keywords

sensornanoscalemagnetic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 962: Symposium P – Nanoscale Magnets – Synthesis, Self-Assembly, Properties and Applications , 2006 , 0962-P09-14
Copyright
Copyright © Materials Research Society 2007

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References

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