Flexible strain sensor with good durability and anti-corrosion property based on metal/polymer composite films embedded
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(2020) 20:133
ORIGINAL ARTICLE
Flexible strain sensor with good durability and anti‑corrosion property based on metal/polymer composite films embedded with silver nanowires Jinjin Luan1 · Qing Wang1 · Xu Zheng1 · Yao Li1 Received: 14 June 2020 / Revised: 21 September 2020 / Accepted: 5 October 2020 © Wroclaw University of Science and Technology 2020
Abstract To avoid corrosion in sea water environment and conductive failures under external loads, a highly durable and anti-corrosion film with sandwich structure embedded with silver nanowires was fabricated as a flexible strain sensor. The effects of film size and ambient temperature on the conductivity of the sensor were studied separately. The silver nanowire-embedded strain sensor showed high durability and remained stable even after multiple bending. The PDMS coating could prevent the conductive layer from the external environment effectively. It is found that the sensor can be used effectively in sea water condition. Furthermore, the sensor connected on the steel sheet was applied in the real-time detection of microstrain in the tensile test, and the relationship between ΔR/R0 and strain illustrated high linear relationship and sensitivity. The good durability and anti-corrosion property of the conductive film showed the highly potential application to be used as a flexible strain sensor in salt-water condition. Graphic abstract
Keywords Strain sensor · Silver nanowires · Sandwich structure film · Anti-corrosion property · Bending durability
1 Introduction
* Qing Wang [email protected] 1
Institute of Nanoengineering, College of Civil Engineering and Architecture, Shandong University of Science and Technology, Shandong 266590, China
Structural health monitoring (SHM) is an intelligent system that monitors the “health state” of the structure in real time using various sensors and predicts structural internal defects and damages. Intelligent material structures are widely applied for SHM in practical engineering [1, 2]. SHM system usually consists of sensors and communication
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equipment, which work together to monitor risk factors and achieve early warning. Now widely used sensors for SHM include fiber brag grating sensors [3, 4], visual sensors [5–7], acoustic emission sensors [8, 9], and piezoelectric sensors [10, 11]. Traditional strain sensors are usually connected to the surface of the structure to monitor structural health condition which leads the sensors to be exposed to harsh conditions. Therefore, the corrosive effects of the external environment on the sensor have to be considered [12]. The lifetime of traditional sensors may be shortened significantly under the long-term corrosion effect, which leads them unsuitable for applying in extreme environments, such as high humidity and high-salt conditions [13]. The traditional strain sensors are generally covered with complex operations by a protective layer. The metal-film strain sensors are easy to be realized as industrial batch strain sensors [14
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