Synthesis of hierarchical shell-core SnO2 microspheres and their gas sensing properties |
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| Affiliation: | 1. Laboratory of Advanced Materials, Department of Chemistry, Shanghai Key Lab of Molecular Catalysis and Innovative Materials, iChEM and State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai 200433, China;2. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Institute of Functional Materials, Donghua University, Shanghai 201620, China;3. Department of Stomatology, Zhongshan Hospital, Fudan University, Shanghai 200032, China;1. College of Materials Science and Engineering, Chongqing University, Chongqing 400030, China;2. School of Electronic and Electrical Engineering, Chongqing University of Arts and Sciences, Chongqing 400030, China;1. College of Science, Civil Aviation University of China, Tianjin, 300300, China;2. Key Laboratory for Soft Chemistry and Functional Materials of Ministry Education, Nanjing University of Science and Technology, Nanjing, 210094, China;1. State Key Laboratory of Marine Resource Utilization in South China Sea, College of Information and Communication Engineering, Hainan University, Haikou 570228, China;2. School of Chemical Engineering & Light Industry, Guangdong University of Technology, Guangzhou 510006, China;3. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China |
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| Abstract: | Using SnSO4, d-glucose, urea and water, hierarchical shell-core SnO2 microspheres were successfully synthesized via a simple hydrothermal method. The characterization results showed that the sizes of as-prepared SnO2 microspheres were 0.6–1 μm, with shell thicknesses of 40−60 nm. The shell and large core of the SnO2 microspheres were all comprised of the same basic rice-like nanoparticles with diameters of 16−25 nm and lengths of 16−45 nm. Further investigaton showed that the glucose and urea served as structural guiding agents, and urea facilitated the formation of the hierarchical structure. The as-prepared SnO2 nanomaterials were used to fabricate a gas sensor with an electrode blade used for the gas sensitivity tests. The hierarchical shell-core SnO2 microspheres exhibited high sensitivity and selectivity toward ethanol, with a responsivity of 63.8 for 50 ppm ethanol at 250 °C, while the response and recovery time were 7 s and 28 s respectively. Moreover, the responsivity of the materials showed good linearity at ethanol concentrations from 500 ppb to 10 ppm. The simple synthetic method, environmentally-friendly raw materials, and excellent gas sensitivity demonstrate that the as-prepared SnO2 nanomaterial has great potential applications for the sensing of ethanol gas. |
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| Keywords: | Hydrothermal Shell-core Hierarchical Glucose Urea |
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