Design, Preparation and Surface-enhanced Raman Scattering(SERS) Spectrum of Single Ag Nanodot†

doi:10.7503/cjcu20190032

Abstract

Abstract:

SERS substrate of single silver nanoclusters was prepared via a novel and simple method, and the surface-enhanced Raman spectra of single silver nanoparticles was studied. Also, the effects of plasma etching time and silver deposition thickness on the structure and morphology of single silver nanoclusters were investigated. And, the SERS spectra of pyridine, mercaptobenzene and R6G probe molecules were recorded on a single silver nanoparticle on PS arrays. In studying the SERS spectrum of R6G, the fluorescence quenching was carried out using the principle of fluorescence resonance energy transfer through PSS-TRITC. The SERS spectra and related calculations show that the Raman enhancement factor of a single silver nanoparticle can reach about 10⁶. The fabrication of metal nanocluster arrays by this method will have potential application prospects in the field of high sensitivity detection.

Key words: Single silver nanoparticles cluster, Raman enhancement factor, Polystyrene microsphere, Fluorescence resonance energy transfer(FRET)

CLC Number:

O614
O647

TrendMD:

FENG Wei,WANG Bowei,JIANG Yang,LI Longyun. Design, Preparation and Surface-enhanced Raman Scattering(SERS) Spectrum of Single Ag Nanodot^†[J]. Chem. J. Chinese Universities, 2019, 40(7): 1345.

Figures/Tables 10

Fig.1 SEM images of the silver nanodots(A) Ag deposition thickness 25 nm, etching time 60 min; (B) Ag deposition thickness 50 nm, etching time 30 min;(C) Ag deposition thickness 100 nm, etching time 40 min; (D) Ag deposition thickness 200 nm etching time 50 min.

Fig.2 AFM images of the Ag nanodot with height phase(A,C) and amplitude phase(B,D)

Fig.3 SERS spectrum of 0.5 mol/L pyridine on a single Ag nanodot Accumulation time is 10 s, single scan, excitation at 514.5 nm, 9 mW.

Fig.4 SERS spectrum of benzenethiol monolayer on a single Ag nanodotAccumulation time is 10 s, single scan, excitation at 514.5 nm, 9 mW.

Fig.5 SERS spectrum of rhodamine 6G monolayer on a single Ag nanodotWith 5-bilayer films of PSS/PDDA as the spacer on the Ag nanodots array, the outer layer is modified by PSS-TRITC, accumulation time is 10 s, single scan, excitation at 514.5 nm, 0.6 mW.

Fig.6 UV-Vis absorption(a) and fluorescence emission(b) of R6G(A) and PSS-TRITC(B) and UV-Vis absorption of PSS-TRITC(a) and fluorescence emission(b) of R6G(C)All the emission spectra are excited at 515 nm.

Fig.7 SERS spectra of rhodamine 6G monolayer on a single Ag nanoparticlea. Ag+[PDDA/PSS]5+PSS-R6G; b. Ag+[PDDA/PSS]5+PSS-R6G+R6G; c. Ag+[PDDA/PSS]5+PSS-R6G. Five bilayer films as spacer on the Ag nanodots array, accumulation time is 10 s, single scan, excitation at 514.5 nm, 0.6 mW. The outer layer is modified by PSS-TRITC but with dropping R6G sample (a), the outer layer is modified by PSS-TRITC, and followed by dropping R6G sample (b) and the outer layer is modified by PSS and followed by dropping the R6G sample(c).

Fig.8 Raman spectrum of pyridineExcited at 514.5 nm, the laser power is 3.93 mW, 10 s, single scan. It is recorded to calculate the enhancement factor of the single Ag nanodot.

Fig.9 Raman spectrum of thiol benzeneExcited at 514.5 nm, the laser power is 5.03 mW, 10 s, single scan. It is recorded to calculate the enhancement factor of the single Ag nanodot.

Table 1 Raman enhancement factor of Ag nanoparticle(λex=514.5 nm)

Probe	Raman shift/cm^-1	G_SERS
Pyridine	1006	5.83×10⁶
Pyridine	1035	6.95×10⁶
Benzenethiol	418	2.05×10⁶
Benzenethiol	998	1.89×10⁶
Benzenethiol	1021	2.26×10⁶
Benzenethiol	1573	6.51×10⁶

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