Flexible thick-film electrochemical sensors: Impact of mechanical bending and stress on the electrochemical behavior

SENSORS AND ACTUATORS B-CHEMICAL

卷:137

Article

Cai, Jiaying²  Cizek, Karel¹  Long, Brenton²  McAferty, Kenyon²  Campbell, Casey G.³  Allee, David R.³  Vogt, Bryan D.³  La Belle, Jeff²  Wang, Joseph¹ 

[1] Univ Calif San Diego, Dept Nanoengn, La Jolla, CA 92093 USA

[2] Arizona State Univ, Biodesign Inst, Tempe, AZ 85287 USA

[3] Arizona State Univ, Flexible Display Ctr, Tempe, AZ 85284 USA

关键词: Screen-printing;    Flexible substrates;    Mechanical bending;    Electrodes;   

DOI  :  10.1016/j.snb.2008.10.027

来源: Elsevier

【 摘 要 】

The influence of the mechanical bending, rolling and crimping of flexible screen-printed electrodes upon their electrical properties and electrochemical behavior has been elucidated. Three different flexible plastic substrates, Mylar, polyethylene naphthalate (PEN), and Kapton, have been tested in connection to the printing of graphite ink won king electrodes. Our data indicate that flexible printed electrodes can be bent to extremely small radii of curvature and still function well, despite a marginal increase the electrical resistance. Below critical radii of curvature of similar to 8 nm, full recovery of the electrical resistance occurs upon strain release. The electrochemical response is maintained for sub-mm bending radii and a 180 pinch of the electrode does not lead to device failure. The electrodes appear to be resistant to repeated bending. Such capabilities are demonstrated using model Compounds, including ferrocyanide, trinitrotoluene (TNT) and nitronaphthalene (NN). These printed electrodes hold great promise for widespread applications requiring flexible, yet robust non-planar sensing devices. (C) 2008 Elsevier B.V. All rights reserved.

【 授权许可】

Free