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Niu JY, Wang L, Hong B, Xu JC, Han YB, Jin HX, Zeng YX, Peng XL, Ge HL, Wang XQ. Synergistic effects of α-Fe 2O 3nanoparticles and Fe-doping on gas-sensing performance of NiO nanowires and interface mechanism. Nanotechnology 2021; 32:485502. [PMID: 34352739 DOI: 10.1088/1361-6528/ac1afb] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Accepted: 08/04/2021] [Indexed: 06/13/2023]
Abstract
High surface area nickel oxide nanowires (NiO NWs), Fe-doped NiO NWs andα-Fe2O3/Fe-doped NiO NWs were synthesized with nanocasting pathway, and then the morphology, microstructure and components of all samples were characterized with XRD, TEM, EDS, UV-vis spectra and nitrogen adsorption-desorption isotherms. Owing to the uniform mesoporous template, all samples with the same diameter exhibit the similar mesoporous-structures. The loadedα-Fe2O3nanoparticles should exist in mesoporous channels between Fe-doped NiO NWs to form heterogeneous contact at the interface of n-typeα-Fe2O3nanoparticles and p-type NiO NWs. The gas-sensing results indicate that Fe-dopant andα-Fe2O3-loading both improve the gas-sensing performance of NiO NWs sensors.α-Fe2O3/Fe-doped NiO NWs sensors presented the highest response to 100 ppm ethanol gas (55.264) compared with Fe-doped NiO NWs (24.617) and NiO NWs sensors (3.189). The donor Fe-dopant increases the ground state resistance and the absorbed oxygen content in air.α-Fe2O3nanoparticles in electron depletion region result in the increasing resistance in ethanol gas and decreasing resistance in air. In this way,α-Fe2O3/Fe-doped NiO NWs sensor presents the excellent gas-sensing performance due to the formation of heterogeneous contact at the interface.
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Affiliation(s)
- J Y Niu
- College of Materials Science and Chemistry, China Jiliang University, Hangzhou, 310018, People's Republic of China
| | - L Wang
- College of Materials Science and Chemistry, China Jiliang University, Hangzhou, 310018, People's Republic of China
| | - B Hong
- College of Materials Science and Chemistry, China Jiliang University, Hangzhou, 310018, People's Republic of China
| | - J C Xu
- College of Materials Science and Chemistry, China Jiliang University, Hangzhou, 310018, People's Republic of China
| | - Y B Han
- College of Materials Science and Chemistry, China Jiliang University, Hangzhou, 310018, People's Republic of China
| | - H X Jin
- College of Materials Science and Chemistry, China Jiliang University, Hangzhou, 310018, People's Republic of China
| | - Y X Zeng
- College of Materials Science and Chemistry, China Jiliang University, Hangzhou, 310018, People's Republic of China
| | - X L Peng
- College of Materials Science and Chemistry, China Jiliang University, Hangzhou, 310018, People's Republic of China
| | - H L Ge
- College of Materials Science and Chemistry, China Jiliang University, Hangzhou, 310018, People's Republic of China
| | - X Q Wang
- College of Materials Science and Chemistry, China Jiliang University, Hangzhou, 310018, People's Republic of China
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Cao J, Qin C, Wang Y, Zhang H, Sun G, Zhang Z. Solid-State Method Synthesis of SnO₂-Decorated g-C₃N₄ Nanocomposites with Enhanced Gas-Sensing Property to Ethanol. Materials (Basel) 2017; 10:ma10060604. [PMID: 28772960 PMCID: PMC5553421 DOI: 10.3390/ma10060604] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Revised: 05/19/2017] [Accepted: 05/26/2017] [Indexed: 10/31/2022]
Abstract
SnO₂/graphitic carbon nitride (g-C₃N₄) composites were synthesized via a facile solid-state method by using SnCl₄·5H₂O and urea as the precursor. The structure and morphology of the as-synthesized composites were characterized by the techniques of X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), energy dispersive spectrometer (EDS), thermogravimetry-differential thermal analysis (TG-DTA), X-ray photoelectron spectroscopy (XPS), and N₂ sorption. The results indicated that the composites possessed a two-dimensional (2-D) structure, and the SnO₂ nanoparticles were highly dispersed on the surface of the g-C₃N₄ nanosheets. The gas-sensing performance of the samples to ethanol was tested, and the SnO₂/g-C₃N₄ nanocomposite-based sensor exhibited admirable properties. The response value (Ra/Rg) of the SnO₂/g-C₃N₄ nanocomposite with 10 wt % 2-D g-C₃N₄ content-based sensor to 500 ppm of ethanol was 550 at 300 °C. However, the response value of pure SnO₂ was only 320. The high surface area of SnO₂/g-C₃N₄-10 (140 m²·g-1) and the interaction between 2-D g-C₃N₄ and SnO₂ could strongly affect the gas-sensing property.
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Affiliation(s)
- Jianliang Cao
- Henan Key Laboratory of Coal Green Conversion, School of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, China.
| | - Cong Qin
- Henan Key Laboratory of Coal Green Conversion, School of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, China.
| | - Yan Wang
- State Key Laboratory Cultivation Base for Gas Geology and Gas Control (Henan Polytechnic University), Jiaozuo 454000, China.
| | - Huoli Zhang
- Henan Key Laboratory of Coal Green Conversion, School of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, China.
| | - Guang Sun
- Henan Key Laboratory of Coal Green Conversion, School of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, China.
| | - Zhanying Zhang
- Henan Key Laboratory of Coal Green Conversion, School of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, China.
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Li YX, Guo Z, Su Y, Jin XB, Tang XH, Huang JR, Huang XJ, Li MQ, Liu JH. Hierarchical Morphology-Dependent Gas-Sensing Performances of Three-Dimensional SnO 2 Nanostructures. ACS Sens 2017; 2:102-110. [PMID: 28722446 DOI: 10.1021/acssensors.6b00597] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Hierarchical morphology-dependent gas-sensing performances have been demonstrated for three-dimensional SnO2 nanostructures. First, hierarchical SnO2 nanostructures assembled with ultrathin shuttle-shaped nanosheets have been synthesized via a facile and one-step hydrothermal approach. Due to thermal instability of hierarchical nanosheets, they are gradually shrunk into cone-shaped nanostructures and finally deduced into rod-shaped ones under a thermal treatment. Given the intrinsic advantages of three-dimensional hierarchical nanostructures, their gas-sensing properties have been further explored. The results indicate that their sensing behaviors are greatly related with their hierarchical morphologies. Among the achieved hierarchical morphologies, three-dimensional cone-shaped hierarchical SnO2 nanostructures display the highest relative response up to about 175 toward 100 ppm of acetone as an example. Furthermore, they also exhibit good sensing responses toward other typical volatile organic compounds (VOCs). Microstructured analyses suggest that these results are mainly ascribed to the formation of more active surface defects and mismatches for the cone-shaped hierarchical nanostructures during the process of thermal recrystallization. Promisingly, this surface-engineering strategy can be extended to prepare other three-dimensional metal oxide hierarchical nanostructures with good gas-sensing performances.
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Affiliation(s)
- Yi-Xiang Li
- Nanomaterials
and Environmental Detection Laboratory, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, PR China
- Department
of Chemistry, University of Science and Technology of China, Hefei 230026, PR China
| | - Zheng Guo
- Nanomaterials
and Environmental Detection Laboratory, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, PR China
- Department
of Chemistry, University of Science and Technology of China, Hefei 230026, PR China
| | - Yao Su
- Nanomaterials
and Environmental Detection Laboratory, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, PR China
- Department
of Chemistry, University of Science and Technology of China, Hefei 230026, PR China
| | - Xiao-Bo Jin
- Nanomaterials
and Environmental Detection Laboratory, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, PR China
| | - Xiang-Hu Tang
- Nanomaterials
and Environmental Detection Laboratory, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, PR China
| | - Jia-Rui Huang
- Department
of Chemistry, Anhui Normal University, Wuhu 241000, PR China
| | - Xing-Jiu Huang
- Nanomaterials
and Environmental Detection Laboratory, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, PR China
- Department
of Chemistry, University of Science and Technology of China, Hefei 230026, PR China
| | - Min-Qiang Li
- Nanomaterials
and Environmental Detection Laboratory, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, PR China
- Department
of Chemistry, University of Science and Technology of China, Hefei 230026, PR China
| | - Jin-Huai Liu
- Nanomaterials
and Environmental Detection Laboratory, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, PR China
- Department
of Chemistry, University of Science and Technology of China, Hefei 230026, PR China
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