Fabrication and SERS Performance of “Sandwich” Structured Silver Nanoparticles/Graphene Oxide Substrates†

doi:10.7503/cjcu20180435

Abstract

Abstract:

Silver nanoparticles/graphene oxide(AgNPs/GO) films with few-layer GO were prepared through alternating deposition of GO sheets and positively charged AgNPs via electrostatic self-assembly approach. The formation and surface morphology of prepared substrates were characterized by UV-Vis spectra, AFM and SEM. The results show that the AgNPs/GO substrates with “Sandwich” structure and AgNPs aggregates can be obtained by the control of concentration of AgNPs colloid and self-assembly cycles. The SERS performances show that the AgNPs/GO-4 substrate has the optimal SERS activity. The average analytical enhancement factors(AEFs) of this substrate towards Rhodamine 6G and crystal violet are 3.4×10⁸ and 1.3×10⁹, respectively, and the minimum detectable concentration of R6G is 10^-12 mol/L. Due to the “Sandwich” structure and strong coupling effect of narrow interparticle distance, abundant “hot spots” can be generated in GO sheets, resulting in improved SERS activity. Furthermore, the strong adsorption ability of few-layer GO is beneficial for enrichment of molecules in substrate, providing the chemical enhancement effect and improving the SERS sensitivity.

Key words: Graphene oxide, Silver nanoparticles, Sandwich structure, Electrostatic self-assembly, Surface-enhanced Raman scattering

CLC Number:

O614
TB34

TrendMD:

WANG Wen,TAO Xiafang,WU Yunyan,ZHAO Nan,CHENG Xiaonong,YANG Juan,ZHOU Yazhou. Fabrication and SERS Performance of “Sandwich” Structured Silver Nanoparticles/Graphene Oxide Substrates^†[J]. Chem. J. Chinese Universities, 2019, 40(4): 667.

Figures/Tables 10

Fig.1 TEM images of GO(A) and AgNPs(B), UV-Vis spectra of GO(C) and AgNPs(D) and particle size distribution of AgNPs(E) The inset in (C) and (D) are digital photos of GO and AgNPs, respectively.

Scheme 1 Schematic illustration for preparing AgNPs/GO-N substrates

Fig.2 UV-Vis spectra of AgNPs/GO-N substrates(A), the change of intensities of GO and AgNPs peaks(B) and the AgNPs peak position with self-assemble numbers(C) Inset of (A) is digital photo of AgNPs/GO-10 substrate.

Fig.3 AFM images of GO adsorbed on glass substrate(A, B) and AgNPs/GO-1(C, D), AgNPs/GO-2(E, F), AgNPs/GO-3(G, H), AgNPs/GO-4(I, J) and AgNPs/GO-5(K, L) substrates

Fig.4 AFM image of GO adsorbed on glass substrate(A) and the height of GO sheets(B)

Fig.5 UV-Vis spectra(A, C) and AFM images(B, D) of AgNPs/GO substrates prepared using 7.2 mg/mL(A, B) and 1.8 mg/mL(C, D) AgNPs colloidsThe insets of (A) and (C) are the correlation of absorbance of GO and AgNPs with the number of assembly cycles.

Fig.6 SEM images of AgNPs/GO-4 substrate with different magnifications

Fig.7 SERS spectra of R6G(A, B) and CV(D, E) adsorbed on AgNPs/GO-2(A, D) and AgNPs/GO-3, AgNPs/GO-4 and AgNPs/GO-5(B, E) substrates and the AEF of AgNPs/GO-4 substrate for 10-7 mol/L R6G(C) and 10-8 mol/L CV(F) aqueous solution(A) a. 10-7 mol/L R6G/AgNPs/GO-2; b. 0.4 mol/L R6G aqueous solution. (B) a. 10-7 mol/L R6G/AgNPs/GO-3; b. 10-7 mol/L R6G/AgNPs/GO-4; c. 10-7 mol/L R6G/AgNPs/GO-5. (D) a. 10-8 mol/L CV/AgNPs/GO-2; b. 0.1 mol/L CV aqueous solution. (E) a. 10-8 mol/L CV/AgNPs/GO-3; b. 10-8 mol/L CV/AgNPs/GO-4; c. 10-8 mol/L CV/AgNPs/GO-5.

Fig.8 Sensitivity of AgNPs/GO-4 substrate towards R6G molecule

Fig.9 SERS mechanism for AgNPs/GO substrate

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