DocumentCode :
2483736
Title :
Polymer substrate temperature sensor array for brain interfaces
Author :
Insoo Kim ; Fok, H.H.R. ; Yuanyuan Li ; Jackson, Thomas N. ; Gluckman, Bruce J.
Author_Institution :
Dept. of Eng. Sci. & Mech., Pennsylvania State Univ., University Park, PA, USA
fYear :
2011
fDate :
Aug. 30 2011-Sept. 3 2011
Firstpage :
3286
Lastpage :
3289
Abstract :
We developed an implantable thin film transistor temperature sensor (TFT-TS) to measure temperature changes in the brain. These changes are assumed to be associated with cerebral metabolism and neuronal activity. Two prototype TFT-TSs were designed and tested in-vitro: one with 8 diode-connected single-ended sensors, and the other with 4 pairs of differential-ended sensors in an array configuration. The sensor elements are 25~100 pm in width and 5 μm in length. The TFT-TSs were fabricated based on high-speed ZnO TFT process technology on flexible polyimide substrates (50 μm thick, 500 μm width, 20 mm length). In order to interface external signal electronics, they were directly bonded to a prototype printed circuit board using anisotropic conductive films The prototypes were characterized between 23~38 °C using a commercial temperature sensor and custom-designed temperature controlled oven. The maximum sensitivity of 40 mV/°C was obtained from the TFT-TS.
Keywords :
II-VI semiconductors; biosensors; brain; neurophysiology; printed circuits; sensor arrays; temperature sensors; thin film sensors; thin film transistors; wide band gap semiconductors; zinc compounds; ZnO; anisotropic conductive films; brain interfaces; cerebral metabolism; custom-designed temperature controlled oven; differential-ended sensors; diode-connected single-ended sensors; external signal electronics interface; flexible polyimide substrates; high-speed ZnO TFT process technology; implantable thin film transistor temperature sensor; neuronal activity; polymer substrate temperature sensor array; prototype printed circuit board; size 5 mum to 20 mm; temperature 23 degC to 38 degC; Sensitivity; Substrates; Temperature measurement; Temperature sensors; Thin film transistors; Zinc oxide; Biosensing Techniques; Body Temperature; Brain; Calibration; Humans;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Engineering in Medicine and Biology Society, EMBC, 2011 Annual International Conference of the IEEE
Conference_Location :
Boston, MA
ISSN :
1557-170X
Print_ISBN :
978-1-4244-4121-1
Electronic_ISBN :
1557-170X
Type :
conf
DOI :
10.1109/IEMBS.2011.6090892
Filename :
6090892
Link To Document :
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