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45. Flexible paper-based piezo-resistive sensor functionalized by MoS2 nanosheets.

Author

Bhakhar, Sanjay A., Tannarana, Mohit, Pataniya, Pratik M., Patel, Nashreen F., Chauhan, Badal, and Solanki, G. K.

Abstract

In the field of wearable electronic devices, flexible sensors based on two-dimensional layered materials have received a great deal of attention owing to high mechanical strength and stable chemical composition. The cellulose-based paper-substrate offers an affordable and bio-compatible device configuration for the fabrication of flexible, light weight and wearable strain or pressure sensors. Herein, we demonstrate the high-yield synthesis of atomically thin MoS2 nanosheets by sono-chemical exfoliation technique and fabrication of the paper based piezoresistive pressure sensor. Highly sensitive and large area MoS2 functionalized pressure sensor are fabricated using the readily available tissue papers and tested in pressure range 2–25 kPa. Owing to optimized device structure, the responsivity and pressure sensitivity of piezoresistive sensor are found to be about 555.2% and 0.638 kPa−1, respectively. The nicely coated MoS2 nanosheets on tiny-threads of tissues papers offers the retention of the device performance even after few hundreds of cycles of loading and unloading. The device also shows the similar pressure sensitivity even after 10 months in ambient environment due to environmental stability of the MoS2 nanosheets. [ABSTRACT FROM AUTHOR]

Published
2023
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48. Morphology-controlled synthesis of MnO2 grown on carbon fiber paper for high-rate supercapacitor electrode.

Author

Luo, Gaodan, Diao, Guiqiang, He, Qingqing, Han, Shengbo, Dang, Dai, and Su, Xiaohui

Subjects
CARBON paper, SUPERCAPACITOR electrodes, CARBON fibers, DOPING agents (Chemistry), ELECTRODES, NANOWIRES
Abstract

Nanostructured MnO2 with different morphologies based on carbon fiber paper (CFP) had been successfully synthesized via a hydrothermal process. The emphasis of this report focuses on the effect of the Co doping content on the morphologies and electrochemical properties of as-obtained MnO2 electrodes, thereby obtaining the optimal electrode material. Such optimal hierarchical porous nanoflowers entwined with nanowires architecture (Co-MnO2/CFP-1) was obtained by a certain Co content, which displayed an excellent capacitive performance. The Co-MnO2/CFP-1 electrode achieved a relatively high specific capacitance of 161 F g−1 at 1 A g−1, and 57% of the capacitance retention for Co-MnO2/CFP-1 when the current density ranging from 1 to 8 A g−1, which was 27 times than MnO2 without Co doping (MnO2/CFP), proving its excellent rate capability. The Co-MnO2/CFP-1 electrode exhibited a prominent cycle stability of 98% in 10,000 cycles at 4 A g−1. This significant improvement of capacitive performance benefits result from a well-developed interconnected hierarchical structure and provides more electrochemical active site, facilitating the penetration and diffusion of electrolyte. This study provides a general guidance to develop different morphologies of electrode materials for supercapacitor device. [ABSTRACT FROM AUTHOR]

Published
2022
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