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김강현· 차재경· 김종만
신축성 금속 나노선압저항전극 기반 로젯스트레인 센서 (Rosette Strain Sensors Based on Stretchable Metal Nanowire Piezoresistive Electrodes)
Received: 22 August 2018;  Accepted: 8 September 2018.  Published online: 11 October 2018.
In this work, we report a delta rosette strain sensor based on highly stretchable silver nanowire (AgNW) percolation piezoresistors. The proposed rosette strain sensorswereeasily prepared by a facile twostep fabrication route. First, three identical AgNWpiezoresistive electrodes were patterned in a simple and precise manneron a donor film using a solution-processed drop-coating of the AgNWsin conjunction with a tape-type shadow mask. The patterned AgNWelectrodes were then entirely transferred to an elastomeric substrate while embedding them in the polymer matrix. The fabricated stretchable AgNWpiezoresistorscould be operated at up to 20% strain without electricalor mechanical failure, showing a maximum gauge factor as high as 5.3, low hysteresis, and high linearity (r2 ≈ 0.996).Moreover, the sensor responses were also found to be highly stable and reversibleeven under repeated strain loading/unloading for up to 1000 cycles at a maximum tensile strain of 20%, mainly due to the mechanical stability of the AgNW/elastomer composites. In addition, both the magnitude and direction of the principal strain could be precisely characterized by configuring three identical AgNWpiezoresistors in a delta rosette form, representing the potential for employing the devices as a multidimensional strain sensor in various practical applications.
Keywords: rosette strain sensor, siliver nanowire, stretchable piezoresistor, drop-coating, tape-type shadow mask, solution process
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