Synthesis and Ethanol Sensing Properties of SnO 2 Nanoparticles in SnO 2 Nanotubes Composite
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HYSICAL CHEMISTRY OF NANOCLUSTERS AND NANOMATERIALS
Synthesis and Ethanol Sensing Properties of SnO2 Nanoparticles in SnO2 Nanotubes Composite Feng Lia, Qianli Maa, Wensheng Yua,*, Xiangting Donga,**, Jinxian Wanga, and Guixia Liua aKey
Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province, Changchun University of Science and Technology, Changchun, 130022 China *e-mail: [email protected] **e-mail: [email protected] Received October 22, 2019; revised October 22, 2019; accepted December 17, 2019
Abstract—Multidimensional nanostructures (0D–1D composite nanostructure) SnO2 nanoparticles in SnO2 nanotubes were easily synthesized by combining the co-precipitation method with the coaxial electrospinning method. SnO2 nanoparticles with a size of about 30 nm were synthesized by co-precipitation method, and SnO2 nanoparticles in SnO2 nanotubes were synthesized by coaxial electrospinning by using a dispersion of SnO2 nanoparticles as the inner precursor. Such 0D–1D SnO2 nanostructures have advantages of the enhanced gas sensing performances due to the improved specific surface area and gas accessibility. The multidimensional nanostructures SnO2 nanoparticles in SnO2 nanotubes exhibit an enhanced gas sensing performances in comparison to 0D SnO2 nanoparticles and 1D SnO2 nanotubes. Keywords: multidimensional nanostructures, electrospinning, semiconductor, gas sensors DOI: 10.1134/S0036024420110242
INTRODUCTION Chemiresistive gas sensors based on metal oxide semiconductor (MOS) received much attention due to their extensive application in the detecting of toxic [1], environment pollution [2], and combustible gases [3]. Various kinds of MOS, such as SnO2 [4, 5], ZnO [6, 7], TiO2 [8, 9], In2O3 [10, 11], WO3 [12, 13], and αFe2O3 [14, 15] have been synthesized and applied in gas sensors. To improve the sensing performances of gas sensors, intense efforts have been made, including using noble metal catalysts [16, 17], forming hierarchical structure [18, 19], and fabrication of core-shell structures [20, 21] etc. These efforts can be associated with the working principle of gas sensors based on MOS, the receptor function, transducer function and utility factor. Among them, increasing utility factor is a quite effective method to improve the sensing performances by increasing the specific surface areas. Recent years, various kinds of microstructure of MOS were developed to increase the specific surface areas. From the basic nanospheres [22] to the porous nanospheres [23], hollow nanospheres [24], yolk-shell nanospheres [25], and multishelled hollow nanospheres [26, 27] etc., from the basic nanofibers [28], nanowires [29], and nanobelts [30] to the hollow nanofibers [31], macroporous nanotubes [32], tubein-tube structures [33], and thin-wall assembled nanofibers [34] etc., the development of the microstructure of nanospheres and nanofibers indicated
that specific surface areas play an important role in the improvement of sensing performances. In addition, multidimensional nanostructures,
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