SnO2nanoparticles mixed with different amounts of gold nanoparticles(GNPs)were synthesized and their CO sensingproperties were investigated.The sol-gel method was employed to prepare the initial solution.SEM,TEM,XRD,D...SnO2nanoparticles mixed with different amounts of gold nanoparticles(GNPs)were synthesized and their CO sensingproperties were investigated.The sol-gel method was employed to prepare the initial solution.SEM,TEM,XRD,DLS andspectrophotometry were used to characterize the nanoparticles.The pure sensors showed a response of about4to12.8for(20-80)×10-6CO at operating temperature of340°C.The response and recovery time at50×10-6Co is about10and14s,respectively.The amount of GNPs optimized was used to create high performance GNP-SnO2sensors(m(Au)/m(Sn)=3.7663×10-4)and optimal operating temperature was about260°C and the response at concentrations of(20-80)×10-6was8.3to29.5,respectively.展开更多
Cellulose-based nanocomposite aerogels were prepared by incorporation of aluminum hydroxide(AH) nanoparticles into cellulose gels via in-situ sol-gel synthesis and following supercritical CO_2 drying. The structure an...Cellulose-based nanocomposite aerogels were prepared by incorporation of aluminum hydroxide(AH) nanoparticles into cellulose gels via in-situ sol-gel synthesis and following supercritical CO_2 drying. The structure and properties of cellulose/AH nanocomposite aerogels were investigated by Fourier transform infrared spectroscopy, scanning electron microscopy,ultraviolet-visible spectrometry, N_2 adsorption, thermogravimetric analysis, and micro-scale combustion calorimetry. The results indicated that the AH nanoparticles were homogeneously distributed within matrix, and the presence of AH nanoparticles did not affect the homogeneous nanoporous structure and morphology of regenerated cellulose aerogels prepared from1-allyl-3-methylimidazolium chloride solution. The resultant nanocomposite aerogels exhibited good transparency and excellent mechanical properties. Moreover, the incorporation of AH was found to significantly decrease the flammability of cellulose aerogels. Therefore, this work provides a facile method to prepare transparent and flame retardant cellulose-based nanocomposite aerogels, which may have great potential in the application of building materials.展开更多
文摘SnO2nanoparticles mixed with different amounts of gold nanoparticles(GNPs)were synthesized and their CO sensingproperties were investigated.The sol-gel method was employed to prepare the initial solution.SEM,TEM,XRD,DLS andspectrophotometry were used to characterize the nanoparticles.The pure sensors showed a response of about4to12.8for(20-80)×10-6CO at operating temperature of340°C.The response and recovery time at50×10-6Co is about10and14s,respectively.The amount of GNPs optimized was used to create high performance GNP-SnO2sensors(m(Au)/m(Sn)=3.7663×10-4)and optimal operating temperature was about260°C and the response at concentrations of(20-80)×10-6was8.3to29.5,respectively.
基金supported by the National Natural Science Foundation of China (51273206, 51425307)
文摘Cellulose-based nanocomposite aerogels were prepared by incorporation of aluminum hydroxide(AH) nanoparticles into cellulose gels via in-situ sol-gel synthesis and following supercritical CO_2 drying. The structure and properties of cellulose/AH nanocomposite aerogels were investigated by Fourier transform infrared spectroscopy, scanning electron microscopy,ultraviolet-visible spectrometry, N_2 adsorption, thermogravimetric analysis, and micro-scale combustion calorimetry. The results indicated that the AH nanoparticles were homogeneously distributed within matrix, and the presence of AH nanoparticles did not affect the homogeneous nanoporous structure and morphology of regenerated cellulose aerogels prepared from1-allyl-3-methylimidazolium chloride solution. The resultant nanocomposite aerogels exhibited good transparency and excellent mechanical properties. Moreover, the incorporation of AH was found to significantly decrease the flammability of cellulose aerogels. Therefore, this work provides a facile method to prepare transparent and flame retardant cellulose-based nanocomposite aerogels, which may have great potential in the application of building materials.
