Preparation and formaldehyde sensitive properties of N-GQDs/SnO2 nanocomposite |
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| Institution: | 1. The State Key Laboratory of Molecular Engineering of Polymers, Department of Chemistry, Fudan University, Shanghai 200433, China;2. Department of Physics & Department of Chemistry, College of Science, Shanghai University, Shanghai 200444, China;1. NEST Lab, Department of Chemistry, Department of Physics, College of Science, Shanghai University, Shanghai 200444, China;2. School of Materials Science and Engineering, Cultivating Base for Key Laboratory of Environment-friendly Inorganic Materials in University of Henan Province, Henan Polytechnic University, Jiaozuo 454000, China;1. College of Materials Science and Engineering, University of Shanghai for Science & Technology, Shanghai 200093, China;2. School of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China |
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| Abstract: | Graphene quantum dots (GQDs) have both the properties of graphene and semiconductor quantum dots, and exhibit stronger quantum confinement effect and boundary effect than graphene. In addition, the band gap of GQDs will transform to non-zero from 0 eV of graphene by surface functionalization, which can be dispersed in common solvents and compounded with solid materials. In this work, the SnO2 nanosheets were prepared by hydrothermal method. As the sensitizer, nitrogen-doped graphene quantum dots (N-GQDs) were prepared and composited with SnO2 nanosheets. Sensing performance of pristine SnO2 and N-GQDs/SnO2 were investigated with HCHO as the target gas. The response (Ra/Rg) of 0.1% N-GQDs/SnO2 was 256 for 100 ppm HCHO at 60 °C, which was about 2.2 times higher than pristine SnO2 nanosheet. In addition, the material also had excellent selectivity and low operation temperature. The high sensitivity of N-GQDs/SnO2 was attributed to the increase of active sites on materials surface and the electrical regulation of N-GQDs. This research is helpful to develop new HCHO gas sensor and expand the application field of GQDs. |
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| Keywords: | Formaldehyde gas sensor Graphene quantum dots Nitrogen-doped graphene quantum dots Nanocomposites Nanosheets |
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