Switchable disposable passive RFID vapour sensors from inkjet printed electronic components integrated with PDMS as a stimulus responsive material
Switchable disposable passive RFID vapour sensors from inkjet printed electronic components integrated with PDMS as a stimulus responsive material
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DOI：
10.1039/c6tc05509e
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发表时间：
2017-03-28
影响因子：
6.4
通讯作者：
Holder, S. J.
中科院分区：
文献类型：
--
作者：
Belsey, K. E.;Parry, A. V. S.;Holder, S. J.
本文报道了用于化学传感市场的廉价和一次性传感器的路线，其潜在应用包括监测食品腐败。该传感器是刺激响应材料聚二甲基硅氧烷（PDMS）与电子元件直接集成的结果。胶体银油墨溶液在PDMS上的印刷和烧结进行了优化，以允许印刷导电银馈电环，这是无源（无电池）射频识别（RFID）标签天线中的主动传感元件。这些装置的响应与PDMS的膨胀程度有关，而PDMS的膨胀程度又与汉森溶解度参数和相应挥发性有机化合物（VOCs）的蒸气压相关。当暴露在溶剂蒸汽中时，印刷的馈电回路断裂，增加电阻并最终破坏导电性，导致无线设备的传输功率和读取范围发生变化。引人注目的是，从蒸汽中移除后，断裂的进料回路重新组装并再次导电，使它们可切换和“多用途”。这项工作为用于蒸汽检测的完全喷墨印刷RFID基板铺平了道路。
A route to cheap and disposable sensors for the chemical sensing market, with potential applications including monitoring of food spoilage, is reported herein. The sensor is the result of the direct integration of a stimuli-responsive material, poly(dimethylsiloxane) (PDMS), with an electronic component. The printing and sintering of colloidal silver ink solutions onto PDMS was optimized to allow the printing of conductive silver feed loops, which are the active sensing component in antennas for passive (battery-free) Radio Frequency Identification (RFID) tags. The response of these devices is related to the degree of swelling of the PDMS, which, in turn, has been shown to be correlated to the Hansen solubility parameters and the vapour pressures of the corresponding volatile organic compounds (VOCs). When exposed to solvent vapour the printed feed loop fractures, increasing resistance and ultimately breaking conductivity, leading to a change in the transmitted power and read range of the wireless device. Remarkably upon removal from the vapour, the fractured feed loops reassemble and become conductive again, making them switchable and "multi-use''. This work paves the way to a fully inkjet printed RFID substrate for vapour detection.