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The emerging micro-nano-processing technologies have propelled significant advances in multifunctional systems that can perform multiple functions within a small volume through integration. Herein, we present an on-chip multifunctional system based on a 1T/2H-MoS2/graphene fishnet tube, where a micro-supercapacitor and a gas sensor are integrated. A hybrid three-dimensional stereo nanostructure, including MoS2 nanosheets and graphene fishnet tubes, provides K+ ions with a short diffusion pathway and more active sites. Owing to the large layer spacing of 1T-MoS2 promoting fast reversible diffusion, the on-chip micro-supercapacitor exhibits excellent electrochemical properties, including an areal capacitance of 0.1 F·cm-2 (1 mV·s-1). The variation in the conductivity of 2H-MoS2 when ammonia molecules are adsorbed as derived from the first-principles calculations proves the Fermi level-changes theory. Driven by a micro-supercapacitor, the responsivity of the gas sensor can reach 55.7% at room temperature (27 °C). The multifunctional system demonstrates the possibility of achieving a two-dimensional integrated system for wearable devices and wireless sensor networks in the future.


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Hybridized 1T/2H-MoS2/graphene fishnet tube for high-performance on-chip integrated micro-systems comprising supercapacitors and gas sensors

Show Author's information Chi Zhang1,2Jing Ning1,2( )Boyu Wang1,2Haibin Guo1,2Xin Feng1,2Xue Shen1,2Yanqing Jia1,2Jianguo Dong1,2Dong Wang1,2Jincheng Zhang1,2( )Yue Hao1,2
The State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology, Xidian University, Xi’an 710071, China
Shaanxi Joint Key Laboratory of Graphene, Xidian University, Xi’an 710071, China

Abstract

The emerging micro-nano-processing technologies have propelled significant advances in multifunctional systems that can perform multiple functions within a small volume through integration. Herein, we present an on-chip multifunctional system based on a 1T/2H-MoS2/graphene fishnet tube, where a micro-supercapacitor and a gas sensor are integrated. A hybrid three-dimensional stereo nanostructure, including MoS2 nanosheets and graphene fishnet tubes, provides K+ ions with a short diffusion pathway and more active sites. Owing to the large layer spacing of 1T-MoS2 promoting fast reversible diffusion, the on-chip micro-supercapacitor exhibits excellent electrochemical properties, including an areal capacitance of 0.1 F·cm-2 (1 mV·s-1). The variation in the conductivity of 2H-MoS2 when ammonia molecules are adsorbed as derived from the first-principles calculations proves the Fermi level-changes theory. Driven by a micro-supercapacitor, the responsivity of the gas sensor can reach 55.7% at room temperature (27 °C). The multifunctional system demonstrates the possibility of achieving a two-dimensional integrated system for wearable devices and wireless sensor networks in the future.

Keywords: gas sensor, supercapacitor, multifunctional system, integrate, 1T/2H-MoS2

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Publication history
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Acknowledgements

Publication history

Received: 30 June 2020
Revised: 09 August 2020
Accepted: 11 August 2020
Published: 05 January 2021
Issue date: January 2021

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature

Acknowledgements

The work was supported by the Natural Science Basic Research Plan in Shaanxi Province of China (Nos. 2017ZDCXL-GY-11-03 and 2019ZDLGY16-08); Youth Science and Technology Nova Program of Shaanxi Province; the Wuhu and Xidian University special fund for industry-university-research cooperation (No. HX01201909039).

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