Document Detail

Pressure sensing using a completely flexible organic transistor.
MedLine Citation:
PMID:  17344042     Owner:  NLM     Status:  MEDLINE    
In this paper, we report on pressure sensors based on completely flexible organic thin film transistors (OTFTs). A flexible and transparent plastic foil (Mylar) is employed both as substrate and gate dielectric. Gold source and drain electrodes are patterned on the upper side of the foil while the gate electrode lies on the opposite side; a vacuum-sublimed pentacene film is used as active layer. The pressure dependence of the output current has been investigated by applying to the gate side of the device a mechanical stimulus by means of a pressurized airflow. Experimental results show a reversible dependence of the current on the pressure. The data analysis suggests that the current variations are due to pressure-induced variations of mobility, threshold voltage and possibly contact resistance. The drain current variation is reproducible, linear and reversible even though it displays a hysteresis. Moreover, the sensor responds very fast to the mechanical stimulus (i.e. within tens-hundreds of milliseconds) but the time required to reach the steady state is much higher (tens-hundreds of seconds). Electrical characteristics with and without applied pressure have been carried out in air without any extra ad hoc read-out circuit or equipment. The reported devices show potential advantages of flexibility of the structure, low cost and versatility of the device structure for sensor technologies. Many innovative and attractive applications as wearable electronics, e-textiles, e-skin for robots can be considered.
I Manunza; A Bonfiglio
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-02-03
Journal Detail:
Title:  Biosensors & bioelectronics     Volume:  22     ISSN:  0956-5663     ISO Abbreviation:  Biosens Bioelectron     Publication Date:  2007 Jun 
Date Detail:
Created Date:  2007-05-21     Completed Date:  2007-07-26     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  9001289     Medline TA:  Biosens Bioelectron     Country:  England    
Other Details:
Languages:  eng     Pagination:  2775-9     Citation Subset:  IM    
CNISM, University of Cagliari, Department of Electric and Electronic Engineering, Italy.
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MeSH Terms
Biosensing Techniques / instrumentation*
Sensitivity and Specificity
Transistors, Electronic*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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