Au hierarchical architectures with special morphology and structures are strongly desired in varied applications.Herein,a simple synthesis method was developed for the one-step preparation of Au micronails(MNs)at the ...Au hierarchical architectures with special morphology and structures are strongly desired in varied applications.Herein,a simple synthesis method was developed for the one-step preparation of Au micronails(MNs)at the planar liquid-liquid interface under mild conditions.The well-defined Au MNs were grown and constructed at CHCl_(3)-H_(2)O interface at room temperature using aniline in CHCl_(3)as reducing agent and HAuCl_(4)in H_(2)O as precursor and no surfactant or seed is required.The intriguing Au MNs with rough surface consist of big heads and thin rods,just like iron nails in outline.Furthermore,through simple changing the reagent concentrations,the length and surface roughness of Au MNs can be adjusted conveniently.The effects of a series of factors on the morphology and structure of the products are studied in detail.With p-aminothiophenol as a molecular probe,the as-obtained Au MNs all exhibit dramatically improved surface enhanced Raman scattering sensitivity and high reproducibility,the enhancement factor and limit of detection of Au MNs are 5.4×10^(5)and 1.0×10^(-10),respectively.展开更多
The roles of temperature change in surface-enhanced Raman scattering(SERS)hotspots are important for understanding the plasmon-mediated selective oxidation of p-aminothiophenol in a SERS measurement. Here, we demonstr...The roles of temperature change in surface-enhanced Raman scattering(SERS)hotspots are important for understanding the plasmon-mediated selective oxidation of p-aminothiophenol in a SERS measurement. Here, we demonstrate that the temperature change in hotspots seriously influences the conversion of p-aminothiophenol on Au by employing variable-temperature SERS measurements. The conversion steadily and irreversibly increased when the temperature increased from 100 to 360 K. But the conversion decreased above 360 K, because this conversion was exothermic. This temperature-dependence conversion suggests that the temperature change in hotspots originated from the photothermal effect should be coupled to the hot-electron effect in promoting the selective oxidation of p-aminothiophenol.展开更多
基金supported by Natural Science Foundation of Henan Province(grant Nos.242300420187,222300420146).
文摘Au hierarchical architectures with special morphology and structures are strongly desired in varied applications.Herein,a simple synthesis method was developed for the one-step preparation of Au micronails(MNs)at the planar liquid-liquid interface under mild conditions.The well-defined Au MNs were grown and constructed at CHCl_(3)-H_(2)O interface at room temperature using aniline in CHCl_(3)as reducing agent and HAuCl_(4)in H_(2)O as precursor and no surfactant or seed is required.The intriguing Au MNs with rough surface consist of big heads and thin rods,just like iron nails in outline.Furthermore,through simple changing the reagent concentrations,the length and surface roughness of Au MNs can be adjusted conveniently.The effects of a series of factors on the morphology and structure of the products are studied in detail.With p-aminothiophenol as a molecular probe,the as-obtained Au MNs all exhibit dramatically improved surface enhanced Raman scattering sensitivity and high reproducibility,the enhancement factor and limit of detection of Au MNs are 5.4×10^(5)and 1.0×10^(-10),respectively.
基金financially supported by the National Natural Science Foundation of China (Nos.21872094,21991152,and21991150)a ShanghaiTech University Start-Up grant。
文摘The roles of temperature change in surface-enhanced Raman scattering(SERS)hotspots are important for understanding the plasmon-mediated selective oxidation of p-aminothiophenol in a SERS measurement. Here, we demonstrate that the temperature change in hotspots seriously influences the conversion of p-aminothiophenol on Au by employing variable-temperature SERS measurements. The conversion steadily and irreversibly increased when the temperature increased from 100 to 360 K. But the conversion decreased above 360 K, because this conversion was exothermic. This temperature-dependence conversion suggests that the temperature change in hotspots originated from the photothermal effect should be coupled to the hot-electron effect in promoting the selective oxidation of p-aminothiophenol.
