ZnO bicrystalline nanosheets have been synthesized by using Ax=AU1-x alloy catalyst via the vapor transport and condensation method at 650 ℃. High resolution transmission electron microscopy characterization reveals ...ZnO bicrystalline nanosheets have been synthesized by using Ax=AU1-x alloy catalyst via the vapor transport and condensation method at 650 ℃. High resolution transmission electron microscopy characterization reveals a twin boundary with {01-13} plane existing in the bicrystalline. A series of control experiments show that both AgxAu1-x alloy catalyst and high supersaturation of Zn vapor are prerequisites for the formation of ZnO bicrystalline nanosheet. Moreover, it is found that the density of ZnO bicrytalline nanosheets can be tuned through varying the ratio of Ag to Au in the alloy catalyst. The result demonstrates that new complicated nanostructures can be produced controllably with appropriate alloy catalyst.展开更多
采用均匀沉淀法合成Zn O纳米颗粒(Zn O NPs),以Zn O NPs为种子,制备水溶性Au/Zn O异质结构。将Au/Zn O异质结构附着于离子液体功能化石墨烯(GN)复合膜上,形成一种新颖的负载型石墨烯复合材料(Au/Zn O/GN)。所构建的青霉素酶-氧化苏木精...采用均匀沉淀法合成Zn O纳米颗粒(Zn O NPs),以Zn O NPs为种子,制备水溶性Au/Zn O异质结构。将Au/Zn O异质结构附着于离子液体功能化石墨烯(GN)复合膜上,形成一种新颖的负载型石墨烯复合材料(Au/Zn O/GN)。所构建的青霉素酶-氧化苏木精修饰Au/Zn O/GN(PH-AZG)传感器在PBS水溶液(p H=7.0)中对青霉素钠检测线性范围为2.5×10^(-14)~3.3×10^(-6)mol/L,检出限达到1.5×10^(-14)mol/L(S/N≥3)。在相同条件下制备5根PH-AZG电极,其响应电流的相对标准偏差(RSD)小于3.2%。同时,在实际牛奶制品中,本方法的检测线性范围为5×10^(-14)~5×10^(-7)mol/L,加标回收率为99.7%~101.4%,RSD为2.3%~3.5%(n=5)。结果表明,本方法对实际牛奶制品中低浓度青霉素钠的检测具有可行性。展开更多
基金ACKNOWLEDGMENTS This work was supported by the Ministry of Science and Technology of China of China （No.2011CB921403）, the National Natural Science Foundation of China （No. 11374274 and No. 11074231）, and Chinese Academy of Sciences （No.XDB01020000）.
文摘ZnO bicrystalline nanosheets have been synthesized by using Ax=AU1-x alloy catalyst via the vapor transport and condensation method at 650 ℃. High resolution transmission electron microscopy characterization reveals a twin boundary with {01-13} plane existing in the bicrystalline. A series of control experiments show that both AgxAu1-x alloy catalyst and high supersaturation of Zn vapor are prerequisites for the formation of ZnO bicrystalline nanosheet. Moreover, it is found that the density of ZnO bicrytalline nanosheets can be tuned through varying the ratio of Ag to Au in the alloy catalyst. The result demonstrates that new complicated nanostructures can be produced controllably with appropriate alloy catalyst.
