TY - JOUR
T1 - Flexible thick-film electrochemical sensors
T2 - Impact of mechanical bending and stress on the electrochemical behavior
AU - Cai, Jiaying
AU - Cizek, Karel
AU - Long, Brenton
AU - McAferty, Kenyon
AU - Campbell, Casey G.
AU - Allee, David
AU - Vogt, Bryan D.
AU - LaBelle, Jeffrey
AU - Wang, Joseph
N1 - Funding Information:
This work was supported by the Office of Naval Research (award number N000140811202), the National Institute of Health (grants no. S000256 and EB002189), and the Army Research Laboratory (ARL; Cooperative Agreement W911NG-04-2-0005). The views contained in this document are those of the authors and should not be interpreted as representing the official policies of the U.S. Government.
PY - 2009/3/28
Y1 - 2009/3/28
N2 - 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 working 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 ∼8 mm, 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.
AB - 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 working 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 ∼8 mm, 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.
KW - Electrodes
KW - Flexible substrates
KW - Mechanical bending
KW - Screen-printing
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U2 - 10.1016/j.snb.2008.10.027
DO - 10.1016/j.snb.2008.10.027
M3 - Article
AN - SCOPUS:60549105821
SN - 0925-4005
VL - 137
SP - 379
EP - 385
JO - Sensors and Actuators, B: Chemical
JF - Sensors and Actuators, B: Chemical
IS - 1
ER -