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Journal of Sensors
Volume 2015, Article ID 408458, 7 pages
http://dx.doi.org/10.1155/2015/408458
Research Article

Fabrication of a Needle Microsensor and Its Applications in the Detection of Dissolved Oxygen

1Research Center of Experimental Acupuncture Science, College of Acumox and Tuina, Tianjin University of Traditional Chinese Medicine, Tianjin 300193, China
2The Key Laboratory of Bioactive Materials, College of Life Science, Nankai University, No. 94 Weijin Road, Tianjin 300071, China

Received 13 January 2015; Revised 24 March 2015; Accepted 27 March 2015

Academic Editor: Yanxia Hou

Copyright © 2015 Yuxin Fang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A novel needle microsensor measurement system was fabricated and applied to determine the concentration of dissolved oxygen. Platinum nanoparticles were employed to modify the surface of copper-core electrode in order to improve electrochemical response signal. The homemade electrode displayed efficient electrocatalytic reduction activity towards dissolved oxygen. The sensor responded linearly to dissolved oxygen in the range of 10 μM to 0.195 mM and had a remarkable sensitivity of 9.02 μA/mM. In addition, it showed an excellent reproducibility, stability, and selectivity. These results indicated that the needle microsensor when used, could yield good performance. Moreover, it is believed to be a potential tool for studying specific substances at a cellular level or in vivo in future.