Coaxial electrospun flexible PANI//PU fibers as highly sensitive pH wearable sensor
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Coaxial electrospun flexible PANI//PU fibers as highly sensitive pH wearable sensor Xuesong Hou1, Yan Zhou1, Yongjia Liu2, Liping Wang1,*, and Jinye Wang1 1 2
School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China Instrumental Analysis Center, National Center for Translation Medicine Shanghai Jiao Tong University, Shanghai 200240, China
Received: 20 April 2020
ABSTRACT
Accepted: 14 July 2020
The combination of conductive material and flexible material is an unavoidable problem in the preparation of flexible sensor, but uniform combination of the materials in micro- or nanostructure is difficult. Coaxial electrospinning is an effective way to realize the combination, which is very strict for the solutions and the synthesis conditions. In this paper, composite pH-sensitive sensors were developed by coaxial electrospinning of polyaniline (PANI) and polyurethane (PU) into core–shell fibers. PU improved the mechanical properties of the sensors. The mechanical properties and conductivity of the sensor can be changed through adjusting the proportion of PANI and PU. By chronopotentiometry in buffer solutions, the sensor worked linearly in the pH range of 2–7 with the sensitivity of - 60 mV/pH and pH change below 0.2 can be detected. It was also proved that the sensor can resist the influence from the changes in temperature, detection time and deformation of the sensor, ensuring the stability in pH detection. Further, by attaching to skin, our sensor showed the response to the pH of small amount of sweat on the skin surface, which suggested the possibility in wearable devices.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Handling Editor: Gregory Rutledge.
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https://doi.org/10.1007/s10853-020-05110-7
J Mater Sci
GRAPHIC ABSTRACT
Introduction Emerging flexible electronic devices can take advantage of variety of functional materials through the perfect combination of mechanics and electronics to achieve different device functions in a flexible working environment. Flexible electronic devices have been widely used in information [1], energy [2, 3], medicine [4, 5] and other fields. Flexible biosensors with excellent elasticity and electrochemical properties can fit better with tissue or skin compared to the traditional rigid sensors, which promises the potential applications in biometric testing and wearable devices [6, 7]. With the increasing demands in medical detection, researchers have paid much attention to the study of flexible biosensors, applied in monitoring human motion [1, 8], skin temperature [1] or detecting biomolecules [2], pH [9]. Small, thin and light devices are more beneficial to combining with tissue. These all put forward high request to the material and the structure of the device. Many studies have focused on the preparation of flexible sensors with excellent performance by low-cost processes, aiming at clinical application.
For the flexible biosensors, good flexibility is a main
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