Fabrication of a Microneedle/CNT Hierarchical Micro/Nano Surface Electrochemical Sensor and its In-Vitro Glucose Sensing Characterization

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Fabrication of a Microneedle/CNT Hierarchical Micro/Nano Surface Electrochemical Sensor and its In-Vitro Glucose Sensing Characterization

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Title: Fabrication of a Microneedle/CNT Hierarchical Micro/Nano Surface Electrochemical Sensor and its In-Vitro Glucose Sensing Characterization
Author(s):
Yoon, Youngsam;
Lee, Gil Sik;
Yoo, Koangki;
Lee, Jeong-Bong
Item Type: article
Keywords: Microneedles
Glucose sensing
Nanoparticles
Diabetes
Abstract: We report fabrication of a microneedle-based three-electrode integrated electrochemical sensor and in-vitro characterization of this sensor for glucose sensing applications. A piece of silicon was sequentially dry and wet etched to form a 15 x 15 array of tall (approximately 380 μm) sharp silicon microneedles. Iron catalyst was deposited through a SU-8 shadow mask to form the working electrode and counter electrode. A multi-walled carbon nanotube forest was grown directly on the silicon microneedle array and platinum nano-particles were electrodeposited. Silver was deposited on the Si microneedle array through another shadow mask and chlorinated to form a Ag/AgCl reference electrode. The 3-electrode electrochemical sensor was tested for various glucose concentrations in the range of 3~20 mM in 0.01 M phosphate buffered saline (PBS) solution. The sensor's amperometric response to the glucose concentration is linear and its sensitivity was found to be 17.73 ± 3 μA/mM-cm². This microneedle-based sensor has a potential to be used for painless diabetes testing applications.;
ISSN: 1424-8220
Persistent Link: http://dx.doi.org/10.3390/s131216672
http://hdl.handle.net/10735.1/3946
Terms of Use: CC-BY 3.0 (Attribution)

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CC-BY 3.0 (Attribution) Except where otherwise noted, this item's license is described as CC-BY 3.0 (Attribution)