Unidirectionally Sensitive Flexible Resistance Strain Sensor Based on AgNWs/PDMS

doi:10.1007/s12204-024-2711-6

Abstract

Abstract: The flexible strain sensor has found widespread application due to its excellent flexibility, extensibility, and adaptability to various scenarios. This type of sensors face challenges in direction identification owing to strong coupling between the principal strain and transverse resistance. In this study, a silver nanowires (AgNWs)/polydimethylsiloxane (PDMS) strain sensor was developed, using a filtration method for preparing the AgNWs film which was then combined with PDMS to create a unidirectional, highly sensitive, fast-responsive, and linear flexible strain sensor. When the grid width is 0.25 mm, the AgNWs/PDMS strain sensor demonstrates an outstanding unidirectional sensitivity, with a strain response solely along the parallel direction of the grid lines (noise ratio α ≈ 8%), and a fast reaction time of roughly 106.99 ms. In the end, this sensor’s ability to detect curvature was also demonstrated through LEDs, demonstrating its potential applications in various fields, including automotive, medical, and wearable devices.

Key words: flexible strain sensor, silver nanowires (AgNWs), polydimethylsiloxane (PDMS), unidirectional sensitivity

摘要： 柔性应变传感器因良好的柔韧性，延展性与对各种场景的适用性等优势被广泛应用。由于主应变和横向电阻强耦合，该类传感器存在方向识别方面的困难。本文基于抽滤法制备银纳米线（AgNWs）薄膜，并通过浇铸得到聚二甲基硅氧烷（PDMS）柔性基底，结合两者制作了一种单向敏感、灵敏度高、响应时间短、线性度好的柔性应变传感器。AgNWs/PDMS应变传感器表现出显著的单向敏感性能，在栅宽为0.25 mm时仅对栅格平行方向的应变响应（α ≈ 8%），且响应时间较短，约为106.99 ms。最后，通过LED展示了传感器检测弯曲应变的能力，在汽车、医疗行业、可穿戴设备等领域有着良好的应用前景。

关键词: 柔性应变传感器，银纳米线（AgNWs），聚二甲基硅氧烷（PDMS），单向敏感

CLC Number:

TP212

LIU Xinyue, SUN Weiming, HE Mengfan, FANG Yuan, DJOULDE Aristide, DING Wei, LIU Mei, MENG Lingjun, WANG Zhiming. Unidirectionally Sensitive Flexible Resistance Strain Sensor Based on AgNWs/PDMS[J]. J Shanghai Jiaotong Univ Sci, 2025, 30(2): 209-219.

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