TY - JOUR
T1 - Au-on-Ag nanostructure for in-situ SERS monitoring of catalytic reactions
AU - He, Shuyue
AU - Wu, Di
AU - Chen, Siwei
AU - Liu, Kai
AU - Yang, Eui Hyeok
AU - Tian, Fei
AU - Du, Henry
N1 - Publisher Copyright:
© 2022 IOP Publishing Ltd.
PY - 2022/4/9
Y1 - 2022/4/9
N2 - Dual-functionality Au-on-Ag nanostructures (AOA) were fabricated on a silicon substrate by first immobilizing citrate-reduced Ag nanoparticles (Ag NPs, ∼43 nm in diameter), followed by depositing ∼7 nm Au nanofilms (Au NFs) via thermal evaporation. Au NFs were introduced for their catalytic activity in concave-convex nano-configuration. Ag NPs underneath were used for their significant enhancement factor (EF) in surface-enhanced Raman scattering (SERS)-based measurements of analytes of interest. Rhodamine 6G (R6G) was utilized as the Raman-probe to evaluate the SERS sensitivity of AOA. The SERS EF of AOA is ∼37 times than that of Au NPs. Using reduction of 4-nitrothiophenol (4-NTP) by sodium borohydride (NaBH4) as a model reaction, we demonstrated the robust catalytic activity of AOA as well as its capacity to continuously monitor via SERS the disappearance of reactant 4-NTP, emergence and disappearance of intermediate 4,4′-DMAB, and the appearance of product 4-ATP throughout the reduction process in real-time and in situ.
AB - Dual-functionality Au-on-Ag nanostructures (AOA) were fabricated on a silicon substrate by first immobilizing citrate-reduced Ag nanoparticles (Ag NPs, ∼43 nm in diameter), followed by depositing ∼7 nm Au nanofilms (Au NFs) via thermal evaporation. Au NFs were introduced for their catalytic activity in concave-convex nano-configuration. Ag NPs underneath were used for their significant enhancement factor (EF) in surface-enhanced Raman scattering (SERS)-based measurements of analytes of interest. Rhodamine 6G (R6G) was utilized as the Raman-probe to evaluate the SERS sensitivity of AOA. The SERS EF of AOA is ∼37 times than that of Au NPs. Using reduction of 4-nitrothiophenol (4-NTP) by sodium borohydride (NaBH4) as a model reaction, we demonstrated the robust catalytic activity of AOA as well as its capacity to continuously monitor via SERS the disappearance of reactant 4-NTP, emergence and disappearance of intermediate 4,4′-DMAB, and the appearance of product 4-ATP throughout the reduction process in real-time and in situ.
KW - Au-on-Ag nanostructure
KW - catalytic reaction
KW - surfaceenhanced Raman spectrum
KW - thermal evaporation deposition
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U2 - 10.1088/1361-6528/ac47d2
DO - 10.1088/1361-6528/ac47d2
M3 - Article
C2 - 34983032
AN - SCOPUS:85123651155
SN - 0957-4484
VL - 33
JO - Nanotechnology
JF - Nanotechnology
IS - 15
M1 - 155701
ER -