Rapid preparation of a Nafion/Ag NW composite film and its humidity sensing effect

Wang, Yanjie; Wang, Jiale; Hao, Muyu; Li, Bo; Zhu, Zicai; Gou, Xiaofan; Li, Lijie

doi:10.1039/d0ra01650k

Cited by 12 publications

(12 citation statements)

References 35 publications

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“…The device worked within a broad-pressure range (0.6-115 kPa), the maximum sensitivity of which was 1.54 kPa −1 . Furthermore, compared with single-component electrode materials, such as carbon nanotubes (CNTs) 28,29 , graphene 30,31 , conductive polymers 32,33 , metal nanostructures [34][35][36] , and MXene (Ti 3 C 2 T x ) [37][38][39][40] , the conducting composite has been widely utilized in the sensor electrode due to its combined advantages [41][42][43][44][45] . For example, the hybrid of one-dimensional (1D) and two-dimensional (2D) conducting materials could effectively prevent the aggregating and stacking of 2D material, thus forming a homogeneous connective network, which leads to good mechanical and electrical properties of the sensor electrode.…”

Section: Introductionmentioning

confidence: 99%

Microstructured capacitive sensor with broad detection range and long-term stability for human activity detection

Liu

Shen

et al. 2021

npj Flex Electron

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In recent years, flexible stress sensors capable of monitoring diverse body movements and physiological signals have been attracting great attention in the fields of healthcare systems, human–machine interfaces, and wearable electronics. Inspired by the structure of natural eggshell inner membrane (ESIM), we developed a pressure sensor based on MXene (Ti3C2Tx)/Ag NWs (silver nanowires) composite electrodes and the micro-structured dielectric layer to meet the application requirements of wide detection range and long-term stability for the sensors. In the light of the nanoscale-microarray of the dielectric layer and the rough surface of electrode materials, this pressure sensor is expected to allow great and persistent deformation during the loading process. As a result, the device is characterized by an improved sensitivity, fast response (in the millisecond range), wide detection range (0–600 kPa), and long-term stability. The outstanding performance of the proposed sensor makes it possible to detect various human activities, such as speaking, air blowing, clenching, walking, finger/knee/elbow bending, and striking, demonstrating its good application prospects in wearable and flexible electronic devices.

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Section: Introductionmentioning

confidence: 99%

Microstructured capacitive sensor with broad detection range and long-term stability for human activity detection

Liu

Shen

et al. 2021

npj Flex Electron

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“…Although various types of prostheses have been developed, most of them focus on motion and lack sensory function, which limits the tactile perception of amputees. [5] Therefore, installing an artificial skin with array sensors on the surface of a robot prosthesis can effectively help amputees perceive the external environment, such as, mechanical force, humidity, [261] temperature, [262,263] and the shape of objects. For example, researchers configured an ionic sensor with a 3D microfluidic structure as a fingertip device that could sense the movement of the fingertip, and the magnitude and direction of external mechanical strains continuously.…”

Section: Artificial Skinmentioning

confidence: 99%

Ionic Flexible Sensors: Mechanisms, Materials, Structures, and Applications

Zhao

Wang

Tang

et al. 2022

Adv Funct Materials

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109

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Over the past few decades, flexible sensors have been developed from the "electronic" level to the "iontronic" level, and gradually to the "ionic" level. Ionic flexible sensors (IFS) are one kind of advanced sensors that are based on the concept of ion migration. Compared to conventional electronic sensors, IFS can not only replicate the topological structures of human skin, but also are capable of achieving tactile perception functions similar to that of human skin, which provide effective tools and methods for narrowing the gap between conventional electronics and biological interfaces. In this review, the latest research and developments on several typical sensing mechanisms, compositions, structural design, and applications of IFS are comprehensively reviewed. Particularly, the development of novel ionic materials, structural designs, and biomimetic approaches has resulted in the development of a wide range of novel and exciting IFS, which can effectively sense pressure, strain, and humidity with high sensitivity and reliability, and exhibit self-powered, self-healing, biodegradability, and other properties of the human skin. Furthermore, the typical applications of IFS in artificial skin, human-interactive technologies, wearable health monitors, and other related fields are reviewed. Finally, the perspectives on the current challenges and future directions of IFS are presented.

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“…In order to enhance the humidity sensing performance of an IPMC, some functional materials with good conductivity have been used to prepare flexible electrodes on the surface of a Nafion membrane, such as carbon nanotubes, metal nanowires and conductive polymers [ 14 , 15 , 16 , 17 ]. Wang et al deposited a layer of silver nanowire (Ag NW) network on the surface of a Nafion membrane through a spaying process to prepare an Ag-NW-based IPMC humidity sensor [ 18 ]. Compared with the noble metal electrodes, these flexible electrodes not only have excellent conductivity and mechanical flexibility but also have a sparse gap structure to promote the water molecule exchange between the environment and the IPMC.…”

Section: Introductionmentioning

confidence: 99%

Rapid Preparation of Novel Ionic Polymer–Metal Composite for Improving Humidity Sensing Effect

Zhao

Tang

et al. 2023

Polymers

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Ionic polymer–metal composites (IPMCs) have attracted attention in recent years due to their integration of actuation and sensing functions. As one of the main sensing functions of IPMCs, humidity sensing has been of consistent interest in wearable health monitors and artificial skin. However, there are still some technical challenges in that classical IPMCs have poor humidity sensing performance due to their dense surface electrode, and IPMCs are damaged easily due to an electrode/membrane mismatch. In this work, through the spraying and electrodepositing process, we developed an efficient method to rapidly prepare a Au-shell-Ag-NW (silver nanowire)-based IPMC with high strength, low surface resistance and excellent humidity sensing performance. Meanwhile, we optimized the preparation method by clarifying the influence of solvent type and electrodepositing time on the performance of the Au-shell-Ag-NW-based IPMC, thus effectively improving the humidity sensing effect and strength of the IPMC. Compared with previous research, the humidity electrical response (~9.6 mV) of the Au-shell-Ag-NW-based IPMC is at least two orders of magnitude higher than that of the classical IPMC (~0.41 mV), which is mainly attributed to the sparse gap structure for promoting the exchange of water molecules in the environment and Nafion membrane, a low surface resistance (~3.4 Ohm/sq) for transmitting the signal, and a seamless connection between the electrode and Nafion membrane for fully collecting the ion charges in the Nafion membrane. Additionally, the Au-shell-Ag-NW-based IPMC could effectively monitor the human breathing process, and the humidity sensing performance did not change after being exposed to the air for 4 weeks, which further indicates that the Au-shell-Ag-NW-based IPMC has good application potential due to its efficient preparation technology, high stability and good reproducibility.

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Rapid preparation of a Nafion/Ag NW composite film and its humidity sensing effect

Abstract: In this study, a novel electrical humidity-responsive composite film was presented based on the integration of two silver nanowire (Ag NW) layers deposited via the physical deposition process with a Nafion layer sandwiched between them.

Cited by 12 publications

References 35 publications

Microstructured capacitive sensor with broad detection range and long-term stability for human activity detection

Microstructured capacitive sensor with broad detection range and long-term stability for human activity detection

Ionic Flexible Sensors: Mechanisms, Materials, Structures, and Applications

Rapid Preparation of Novel Ionic Polymer–Metal Composite for Improving Humidity Sensing Effect

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