2016
DOI: 10.1016/j.snb.2016.03.068
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Ag-Au alloy nanoparticles: Synthesis and in situ monitoring SERS of plasmonic catalysis

Abstract: Noble metal nanostructures are currently of great interest for their unique plasmonic property and potential applications in catalysis and surface-enhanced spectroscopy. However, the application of plasmonic nanostructures for quantitatively in situ SERS monitoring of the catalytic reaction has been a great challenge for investigators because combining plasmonics with catalysis requires the same kind of noble metal nanoparticles (NPs) in two very different size regimes. Herein, We have demonstrated a facile we… Show more

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Cited by 118 publications
(59 citation statements)
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“…Finally, the reduction of 4-NTP into 4-ATP was followed by real-time SERS after dropping a NaBH 4 solution on the membrane. Figure 7B shows the time-dependent SERS spectra of the 4-NTP-functionalized AgNP@ESM, which was recorded continuously for 270 s. The SERS spectra of 4-NTP exhibit four main characteristic peaks at 853, 1079, 1331 and 1568 cm -1 , attributed to C-H wagging, C-S stretching, O-N-O stretching, and phenyl ring stretching modes, respectively [19]. As the reaction progresses, new vibration Raman bands of an intermediate were observed 30 s later upon NaBH 4 addition, which can be assigned to the spectral features of 4,4 -dimercaptoazobenzene (4,4 -DMAB) at 1138, 1384, and 1428 cm -1 , ascribed to C-N symmetric stretching, N=N stretching and CH in-plane bending modes, respectively [16,19,43].…”
Section: In Situ Monitoring Of Catalytic Reaction With Sersmentioning
confidence: 99%
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“…Finally, the reduction of 4-NTP into 4-ATP was followed by real-time SERS after dropping a NaBH 4 solution on the membrane. Figure 7B shows the time-dependent SERS spectra of the 4-NTP-functionalized AgNP@ESM, which was recorded continuously for 270 s. The SERS spectra of 4-NTP exhibit four main characteristic peaks at 853, 1079, 1331 and 1568 cm -1 , attributed to C-H wagging, C-S stretching, O-N-O stretching, and phenyl ring stretching modes, respectively [19]. As the reaction progresses, new vibration Raman bands of an intermediate were observed 30 s later upon NaBH 4 addition, which can be assigned to the spectral features of 4,4 -dimercaptoazobenzene (4,4 -DMAB) at 1138, 1384, and 1428 cm -1 , ascribed to C-N symmetric stretching, N=N stretching and CH in-plane bending modes, respectively [16,19,43].…”
Section: In Situ Monitoring Of Catalytic Reaction With Sersmentioning
confidence: 99%
“…It seems that the single type of silver nanoparticles can hardly exhibit both excellent catalytic and SERS activity. Therefore, combining catalytically-responsive and SERS-active functionalities into an entire platform through suitable methods of core-shell [16], hybrid [17,18], alloy [19] or assembly [20] is the most popular strategy. However, it is difficult to achieve a balance between high catalytic efficiency and SERS enhancement, as the plasmonic near-field enhancement is distance-dependent and the surface coverage of catalytic nanoparticles (NPs) may also remarkably reduce the SERS enhancement.…”
Section: Introductionmentioning
confidence: 99%
“…640 nm), which illustrates HOMO-LUMO transitions in the clusters. The enhancement of this peak caused by Localized Surface Plasmon Resonance (LSPR) [21]. That is also the manifestation of surface charges that have been produced on the clusters with the passage of time during synthesis.…”
Section: Resultsmentioning
confidence: 99%
“…The SPR band observed at 396 nm for Ag/Au alloy NCs clusters due to a high concentration of Ag. On the other hand, by increasing the concentration of Au, peak will shift towards 520 nm [16,21,29]. The SPR peak at 472 nm represents the exact composition of Ag/Au alloy NCs ( figure 1(a)) [1,21].…”
Section: Surface Plasmon Resonance (Spr)mentioning
confidence: 99%
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