As a key component of electronic skins, flexible pressure sensors have attracted more and more attention because of the increasingly growing demand. Stability is a key parameter to evaluate pressure sensors, while relatively few reports have focused on it. Here, a paper-based piezoresistive sensor is developed, in which, the airlaid paper (AP) based sensing layer is modified with silver nanowires (AgNWs) and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and sandwiched in between two convex electrodes. Due to the cross bonding of PEDOT:PSS membrane, the conductive paths of AgNWs networks are strengthened and stabilized, thus the stability of the sensor is found to be significantly improved. Besides, to regulate the compressibility by varying sensing layers, the performance of the proposed sensor can be further improved, and its practical application performances in healthcare pulse monitoring, tiny muscle motion, and voice recognition are demonstrated. The results confirm that PEDOT:PSS has the potential as stabilization media to AgNWs for paper-based flexible wearable electronics.
serious problem in modern society. It is found that excess electromagnetic radiation threatens human health seriously and causes electronic devices to become invalid. Therefore, more and more attention has been attracted to treating this problem. [1][2][3][4][5][6] Generally, shielding materials with great conductivity are chosen to enhance the shielding effectiveness (SE) and reduce EMI pollution as well. [7,8] Recently, 1D metal nanomaterials such as AgNWs and CuNWs have been introduced as promising shielding materials for achieving superior EMI SE due to their excellent conductive interconnected networks and flexible features. [9][10][11] Jiang et al. prepared a high-performance silver nanotube network sandwiched between ethylene terephthalate and polydimethylsiloxane (PDMS), which shows an EMI SE of 35 dB and a reflection of 0.98 in the X-band. [12] Yang et al. reported a composite material using reduced graphene oxide and silver nanowire, showing an EMI SE of 35.5 dB and a reflection of 0.82. [13] The excellent EMI shielding abilities are reached at the cost of decreasing absorption, resulting in the reflection-dominant shielding mechanism and inevitable serious secondary pollution. Obviously, it is a challenge to prepare the metal nanowire matrix EMI material with high-performance absorption and EMI SE simultaneously.It is well-known that efficient shielding materials can attenuate electromagnetic (EM) waves via reflection loss and absorption loss. [14] When the EM wave incidents a shielding material, reflection, and absorption will happen successively. Due to the impedance mismatch between free space and shielding material, EM waves are reflected into free space. In other words, the shielding film with low impedance could generate serious reflection on the surface (more than 90%) and cause intolerable secondary electromagnetic radiation pollution. When EM waves into the shielding material, absorption loss including electrical loss and magnetic loss occurs, and the energy of the EM wave is converted into heat due to strong natural resonance and eddy current loss originating between microwaves. [15][16][17][18] Based on the above mechanism, improving impedance match is an effective method to reduce reflection loss. [19,20] However, a critical problem should be noted that EMI SE is inevitably decreased with improving impedance match. [20] Obviously, there is a contradiction between high EMI SE and low reflection. Thus, it is Secondary electromagnetic reflection is a great challenge in the field of high conductivity electromagnetic interference (EMI) material due to the poor electromagnetic absorption ability. In this work, a multilayer stack strategy compositing of the absorption-dominated thin films and the reflection-dominated thick film is proposed to realize both high shielding effectiveness (SE) and low reflection. The film comprises 3D woven silver nanowire (AgNWs) networks embedded in the polydimethylsiloxane (PDMS) substrate, and the shielding film thickness can be adjusted via controlling coating cyc...
2101540 (2 of 10) www.advmattechnol.de 6. EMI SE performance of the thick samples, W 1 = 50 µm and W 1 = 70 µm, and plane sample: a) SE Total , b) SE R , c) SE A . d) SEM image of the sample W 1 = 50 µm (on the silicon mold). e) SEM image of the sample W 1 = 70 µm (on the silicon mold).
Woven Ag‐Nanowire 3D Networks Obtaining good electromagnetic interference (EMI) shielding in transparent and/or curved surfaces is still a big challenge in the field of electromagnetic interference. A 3D woven silver nanowire is prepared on a silicon mold and embedded into the surface layer of PDMS film. This conductive film does not only achieve a high EMI shielding effectiveness, but is also lightweight, ultra‐thin, transparent, and flexible. More information can be found in article number 2101540 by Min Wang and co‐workers.
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