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23. Humidity-Tolerant Chemiresistive Gas Sensors Based on Hydrophobic CeO2/SnO2Heterostructure Films

Author

Zhu, Xiaojie, Chang, Xueting, Tang, Sikai, Chen, Xiaoqiu, Gao, Weixiang, Niu, Shicong, Li, Junfeng, Jiang, Yingchang, and Sun, Shibin

Abstract

The accelerated evolution of the Internet of Things has brought new challenges to the gas sensors, which are required to work persistently under harsh conditions, like high humidity. However, currently, it is quite challenging to solve the hindrance of the trade-off between gas-sensing performance and anti-humidity ability of the chemiresistive gas sensors. Herein, hydrophobic inorganic CeO2/SnO2heterostructure films were prepared by depositing the CeO2layers with a thickness of a few nanometers onto the SnO2film via a magnetron sputtering method. The sensors based on the CeO2/SnO2heterostructure films demonstrated excellent gas-sensing performance toward trimethylamine (TEA) with high response, wide detection range (0.04–500 ppm), low record detection limit (0.04 ppm), ideal reproducibility, and long-term stability, while concurrently possessing promising anti-humidity ability. A portable, wireless TEA-sensing system containing the CeO2/SnO2sensor was constructed to realize the real-time monitoring of trace concentration of the volatiles released from a fish. This work provides a novel strategy to prepare advanced chemiresistive gas sensors for humidity-independent detection of harmful gases and vapors and will accelerate their commercialization process in the field of food safety and public health.

Published
2022
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37. Optoelectronic Devices: Solution-Growth Strategy for Large-Scale “CuGaO2 Nanoplate/ZnS Microsphere” Heterostructure Arrays with Enhanced UV Adsorption and Optoelectronic Properties (Adv. Funct. Mater. 23/2017)

Author

Li, Yanmei, primary, Song, Yun, additional, Jiang, Yingchang, additional, Hu, Mingxiang, additional, Pan, Zhichang, additional, Xu, Xiaojie, additional, Chen, Hongyu, additional, Li, Yuesheng, additional, Hu, Linfeng, additional, and Fang, Xiaosheng, additional

Published
2017
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38. Fractal (NixCo1−x)9Se8 Nanodendrite Arrays with Highly Exposed () Surface for Wearable, All‐Solid‐State Supercapacitor.

Author

Yang, Peiyu, Wu, Zeyi, Jiang, Yingchang, Pan, Zhichang, Tian, Wenchao, Jiang, Le, and Hu, Linfeng

Subjects
NICKEL compounds, DENDRITIC crystals, SOLID state chemistry, SOLID solutions, SUPERCAPACITORS, COBALT sulfide
Abstract

Abstract: Hierarchical nanostructures with highly exposed active surfaces for high‐performance pseudocapacitors have attracted considerable attention. Herein, a one‐step growth of (Ni xCo1−x)9Se8 solid solution series in various conductive substrates as advanced electrodes for flexible, foldable supercapacitors is developed. The formation of (NixCo1−x)9Se8 solid solution is confirmed by Vegard's law. Interestingly, the as‐grown (NixCo1−x)9Se8 solid solution series spontaneously crystallized into nanodendrite arrays with hierarchical morphology and fractal feature. The optimized (Ni0.1Co0.9)9Se8 nanodendrites deliver a specific capacitance of 3762 F g−1 at a current density of 5 A g−1 and remains 94.8% of the initial capacitance after 5000 cycles, owing to the advantage from fractal feature with numerous exposed ( 01 1 ¯) surface as well as fast ion diffusion. The as‐assembled flexible (Ni0.1Co0.9)9Se8@carbon fiber cloth (CFC)//PVA/KOH//reduced graphene oxide@CFC device exhibits an ultrahigh energy density of 17.0 Wh kg−1@ 3.1 kW kg−1, outperforming recently reported pseudocapacitors based on nickel‐cobalt sulfide and selenide counterparts. This study provides rational guidance toward the design of fractal feature with superior electrochemical performances due to the significantly increased electrochemical active sites. The resulting device can be easily folded, pulled, and twisted, enabling potential applications in high‐performance wearable and gadget devices. [ABSTRACT FROM AUTHOR]

Published
2018
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39. In situ growth of (NH4)2V10O25·8H2O urchin-like hierarchical arrays as superior electrodes for all-solid-state supercapacitors.

Author

Jiang, Yingchang, Jiang, Le, Wu, Zeyi, Yang, Peiyu, Zhang, Haitao, Pan, Zhichang, and Hu, Linfeng

Abstract

Hierarchical nanostructures with highly exposed active surfaces for use in high-performance pseudocapacitors have attracted considerable attention. Herein, we developed a one-step method for the in situ growth of (NH4)2V10O25·8H2O urchin-like hierarchical structures on highly conductive nickel foam substrates for use as advanced electrodes for all-solid-state asymmetric supercapacitors. The in situ growth of (NH4)2V10O25·8H2O urchin-like hierarchical structures delivers a specific capacitance of 1530 F g−1 at a current density of 1.5 A g−1, and retains 95.1% of the initial capacitance after 10 000 cycles, owing to the advantages of the urchin-like hierarchical structure such as more active sites for electrochemical reactions, as well as a shortened diffusion length for the charge carriers due to a binder-free effect, which exceeds that of most recently reported vanadates and polyvanadates. The as-assembled all-solid-state (NH4)2V10O25·8H2O@Ni//PVA/KOH//RGO@Ni device exhibits a comparable capacity of 92.2 F g−1 at a current density of 0.4 A g−1 and excellent cycling performance through 5000 cycles. Our study provides rational guidance toward the design of novel hierarchical nanostructures of polyvanadate for solid-state supercapacitors with superior electrochemical performances in long-term cycling stability and high energy density. [ABSTRACT FROM AUTHOR]

Published
2018
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42. Solution-Growth Strategy for Large-Scale 'CuGaO2 Nanoplate/ZnS Microsphere' Heterostructure Arrays with Enhanced UV Adsorption and Optoelectronic Properties.

Author

Li, Yanmei, Song, Yun, Jiang, Yingchang, Hu, Mingxiang, Pan, Zhichang, Xu, Xiaojie, Chen, Hongyu, Li, Yuesheng, Hu, Linfeng, and Fang, Xiaosheng

Subjects
OPTOELECTRONIC devices, CRYSTAL growth, COPPER compounds, ZINC sulfide, HETEROSTRUCTURES, P-type semiconductors
Abstract

Intrinsically p-type conductivity and a wide bandgap of ≈3.6 V endow inorganic delafossite CuGaO2 with great promise for fabricating high-performance UV photodetectors. Nevertheless, CuGaO2-based optoelectronic devices hindered because the intrinsic direct transitions are symmetry forbidden in CuGaO2. This study reports a large-area synthesis of 'CuGaO2 nanoplate/ZnS microsphere' heterostructure arrays using a facile solution-based strategy associated with an oil/water interfacial self-assembly approach. It is found that a large number of ZnS microspheres with a polycrystalline structure grow on the top surface of CuGaO2 hexagonal platelets through Ostwald ripening mechanism, forming high-density p-n heterojunctions. A parabolic dependence between the size of ZnS microsphere and the growth time is confirmed in this growth. The UV light adsorption of the heterostructure CuGaO2/ZnS thin film is two times higher than that of the pristine CuGaO2 thin film. Furthermore, the as-designed 'CuGaO2 nanoplate/ZnS microsphere' heterostructure arrays exhibit enhanced photoresponse properties. This work offers a new insight into the rational design of optoelectronic devices from the synergetic effect of p-type 2D nanoplates as well as n-type nanostructures such as ZnS, ZnO, CdS, and CdO. [ABSTRACT FROM AUTHOR]

Published
2017
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47. In SituGrowth of Layered Bimetallic ZnCo Hydroxide Nanosheets for High-Performance All-Solid-State Pseudocapacitor

Author

Pan, Zhichang, Jiang, Yingchang, Yang, Peiyu, Wu, Zeyi, Tian, Wenchao, Liu, Liu, Song, Yun, Gu, Qinfen, Sun, Dalin, and Hu, Linfeng

Abstract

Two-dimensional (2D) hydroxide nanosheets can exhibit exceptional electrochemical performance owing to their shortened ion diffusion distances, abundant active sites, and various valence states. Herein, we report ZnCo1.5(OH)4.5Cl0.5·0.45H2O nanosheets (thickness ∼30 nm) which crystallize in a layered structure and exhibit a high specific capacitance of 3946.5 F g–1at 3 A g–1for an electrochemical pseudocapacitor. ZnCo1.5(OH)4.5Cl0.5·0.45H2O was synthesized by a homogeneous precipitation method and spontaneously crystallized into 2D nanosheets in well-defined hexagonal morphology with crystal structure revealed by synchrotron X-ray powder diffraction data analysis. In situgrowth of ZnCo1.5(OH)4.5Cl0.5·0.45H2O nanosheet arrays on conductive Ni foam substrate was successfully realized. Asymmetric supercapacitors based on ZnCo1.5(OH)4.5Cl0.5·0.45H2O nanosheets @Ni foam// PVA, KOH//reduced graphene oxide exhibits a high energy density of 114.8 Wh kg–1at an average power density of 643.8 W kg–1, which surpasses most of the reported all-solid-state supercapacitors based on carbonaceous materials, transition metal oxides/hydroxides, and MXenes. Furthermore, a supercapacitor constructed from ZnCo1.5(OH)4.5Cl0.5·0.45H2O nanosheets@PET substrate shows excellent flexibility and mechanical stability. This study provides layered bimetallic hydroxide nanosheets as promising electroactive materials for flexible, solid-state energy storage devices, presenting the best reported performance to date.

Published
2018
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50. Shape Control of VO2 (B) Hierarchical Nanostructures.

Author

Ji, Qi, Jiang, Yingchang, Zhang, Zhongping, Tian, Yongtao, and Wang, Zhenyang

Subjects
*NANOSTRUCTURES, *MICROSTRUCTURE, *METALLIC oxides, *OXIDES, *ETHYLENE glycol
Abstract

A green route is designed to gain a clear idea of growth mechanism of complex VO2 (B) hierarchical microstructures, since this kind of metal oxide has various metastable phases due to their diverse valence states. Three-dimensional (3D) uniform flower-like VO2 (B) hierarchical microstructure has thus been assembled with the interleaving nanoplates, which are about 25 nm in thickness and well-crystallized in structure with {114} planes as the dominant surfaces. Results of the systemic control experiments revealed that formation of the flower-like VO2 (B) results from a fast nucleation-growth process, where ethylene glycol (EG) not only acts as a green solvent and reductive agent, but also plays a key role in self-assembly of the resulted VO2 (B) hierarchical microstructures. Hydroxyl amount on the solvent molecule is crucial in formation and shape control of VO2 (B) hierarchical microstructures. Result of this work would be helpful to understand the growth mechanism of complex three-dimensional hierarchical superstructures of different metal oxides, which is very important to material science and inorganic synthetic chemistry. [ABSTRACT FROM AUTHOR]

Published
2014
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