柔性厚膜电化学传感器：机械弯曲和应力对电化学行为的影响
Flexible Thick-Film Electrochemical Sensors: Impact of Mechanical Bending and Stress on the Electrochemical Behavior.
作者信息
Cai Jiaying, Cizek Karel, Long Brenton, McAferty Kenyon, Campbell Casey G, Allee David R, Vogt Bryan D, La Belle Jeff, Wang Joseph
机构信息
The Biodesign Institute, Arizona State University, Tempe, AZ, 85287-5001, USA.
出版信息
Sens Actuators B Chem. 2009 Mar 28;137(1):379-385. doi: 10.1016/j.snb.2008.10.027.
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.
已阐明柔性丝网印刷电极的机械弯曲、轧制和压接对其电学性能和电化学行为的影响。已针对石墨油墨工作电极的印刷测试了三种不同的柔性塑料基板，即聚酯薄膜、聚萘二甲酸乙二醇酯（PEN）和聚酰亚胺薄膜。我们的数据表明，柔性印刷电极可以弯曲到极小的曲率半径，并且尽管电阻略有增加，但仍能正常工作。在约8毫米的临界曲率半径以下，应变释放后电阻会完全恢复。对于亚毫米级的弯曲半径，电化学响应得以维持，并且电极180°的挤压不会导致器件失效。这些电极似乎能抵抗反复弯曲。使用包括亚铁氰化物、三硝基甲苯（TNT）和硝基萘（NN）在内的模型化合物证明了此类能力。这些印刷电极对于需要柔性但坚固的非平面传感设备的广泛应用具有巨大的前景。
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