Han Hanzhi, Fang Changqing, Cheng Youliang, Liu Jie, Li Mengyao, Zhang Xin, Zhao Yifan, Yao Xingbo
School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an 710048, P. R. China.
Faculty of Printing, Packaging Engineering and Digital Media Technology, Xi'an University of Technology, Xi'an 710048, P. R. China.
ACS Appl Mater Interfaces. 2024 Aug 7;16(31):41060-41071. doi: 10.1021/acsami.4c04519. Epub 2024 Jul 26.
Flexible sensors are promising for intelligent packaging and artificial intelligence, but the required multistimulus response is still a challenge in external environments. A candidate material for such multistimulus response is VO due to its unique semiconducting properties. Herein, W-doped VO(M) with a tunable phase transition temperature was prepared by the hydrothermal method, and then, VO(M)-based flexible sensors were fabricated employing a direct-write strategy, where conductive inks with VO(M) powders were patterned onto various substrates. These sensors achieve dual responses to temperature and strain and exhibit high stability (over 2000 stretch-release cycles) to accurately monitor various statuses (opening and closing, temperature changes, etc.) of intelligent packaging. The spatial pressure distribution of different objects was discerned by the prepared VO(M)/poly(dimethylsiloxane) (PDMS) sponge flexible pressure sensor arrays, and the information was successfully edited using the Morse code. The sensing signals from the intelligent packaging were collected and remotely transmitted to intelligent terminals via a wireless local-area network to achieve real-time monitoring of the packaged contents. Therefore, in this work, we not only designed new flexible sensors with multiple stimulus responses but also demonstrated the potential applications of W-doped VO(M)-based flexible sensors in intelligent packaging.
柔性传感器在智能包装和人工智能领域具有广阔前景，但在外部环境中实现所需的多刺激响应仍是一项挑战。由于其独特的半导体特性，氧化钒（VO）是实现这种多刺激响应的一种候选材料。在此，通过水热法制备了具有可调相变温度的钨掺杂氧化钒（VO(M)），然后采用直写策略制造了基于VO(M)的柔性传感器，即将含有VO(M)粉末的导电油墨图案化到各种基板上。这些传感器实现了对温度和应变的双重响应，并表现出高稳定性（超过2000次拉伸-释放循环），能够准确监测智能包装的各种状态（打开和关闭、温度变化等）。通过制备的VO(M)/聚二甲基硅氧烷（PDMS）海绵柔性压力传感器阵列可以识别不同物体的空间压力分布，并使用摩尔斯电码成功编辑信息。来自智能包装的传感信号通过无线局域网收集并远程传输到智能终端，以实现对包装内容物的实时监测。因此，在这项工作中，我们不仅设计了具有多种刺激响应的新型柔性传感器，还展示了基于钨掺杂VO(M)的柔性传感器在智能包装中的潜在应用。
