Synthesis of SnO2 quantum dots with 1,3-dimethylimidazolium-2-carboxylate as inducing agent and the gas sensitive performance to ethanol
In order to obtain SnO2 quantum dots with good gas response,the SnO2 quantum dots with diameters of about 4 nm were successfully synthesized by using 1,3-dimethyl imidazolium-2-carboxylate(1,3-diMiM-2-COO)as inducing agent and polyethylene glycol 200(PEG200)as dispersant.The struc-ture and morphology of SnO2 quantum dots were characterized by X-ray diffraction and high resolution transmission electron microscope.The purity,optical properties,and the specific surface area of SnO2 quantum dots were tested by FT-IR,UV-Vis spectrophotometer and specific surface analyzer,respective-ly.The response to ethanol gas was also tested.The results show that the prepared SnO2 quantum dots have uniform particle size,specific surface area of 123.89 m2/g,visible light transmittance of more than 90％,excellent ethanol gas sensitivity,and the sensitivity of SnO2 quantum dots can be up to 195.34 at 250 ℃ and ethanol volume fraction of 300×10-6.
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