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• W3199277149 abstract "Flexible skin-mountable electronics (E-skin) have received considerable attention in the field of human-machine interfaces, health diagnosis, robotics and artificial intelligence[1]. Human skin, the largest organ of the human body, enables us to interact with the environment changes such as humidity, temperature etc. through the sensation of various mechanical stimuli[2]. E-skin consists of a flexible sensing network that mimics the comprehensive functions of human skin to detect the different stimuli using a multimodal sensing array. The complex fabrication of sensing multilayers, interferences of different modulus functioning, and high power-consumption are still the barriers that must be overcome to realize the practical applications of E-skin in wearable devices[3]. Considering the continuous operation of sensing modulus, the replacement of traditional batteries is one of the key challenges to understand the application prospects and small scale of wearable E-skin. Nowadays, the triboelectric nanogenerator (TENG)-powered sensors are considered to have great potential in the field of self-powering applications due to its lightweight, cost-effectiveness, durability and high efficiency[4]. They convert the human mechanical triggering into an electrical energy and guarantees the power supply along with sensing characteristics at the same time which dispense the need of external power supply. Herein, we report a flexible and portable self-powered humidity sensor based on the conjugation of water content detection and tribo-electrification. In this work, a kind of highly porous, conductive and hydrophilic film of MXene nanofibers (NFs) prepared using electrospinning technique have been utilized as the active layer of the sensor and TENG. The electrospun cellulose NFs have been chosen as the positive layer to form a triboelectric pair with the negative layer of MXene NFs. To drive the sensor, the vertical contact-separation mode of TENG as shown in fig. 1 has been employed under the influence of various ranges of frequencies. The charge transfer process across triboelectric materials decreases with increase in the relative humidity (RH) due to adsorption of water molecules on hydrophilic MXene NFs which was measured as output voltage of TENG. Regarding the electrospun NFs, because of high surface-to-volume ratio, nano-porous and surface roughness structure, charge transport is highly sensitive to water vapors in comparison to plane films. The performance of TENG has been investigated using home-made tapping device under the application of 1-15 Hz frequency and measured the output power density of ~1300 mW/m2 at the tapping of 10 Hz frequency. The TENG-powered sensor was exposed to the RH with a range of 11 to 78 % and the obtained results clearly indicate the decrease in output voltage with increase in humidity value with fast response and recovery time. The as-proposed device can be laminated onto different body parts such as finger joint, knee and throat and maintains stable moisture sensing performance even in the mechanical triggering state such as bending, twisting and compressing of TENG. This work provides a significant approach to fabricate a simple, cost-effective, self-sustainable and self-powered device to monitor the human skin moisture and humidity conditions in the environment for better life." @default.
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• W3199277149 date "2021-09-16" @default.
• W3199277149 modified "2023-09-24" @default.
• W3199277149 title "Electrospun Flexible MXene Nanofibers Based Self-Powered Humidity Sensor for Electronic Skin Applications" @default.
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