Xing-hu FU, Zhen-xing WANG, Jia-xuan LI, Shuang-yu MA, Guang-wei FU, Wa JIN, Wei-hong BI, Yan-hua DONG. Preparation and Performance Comparison of Nano-Silver Sol and Micro-Cavity Fiber SERS Substrates[J]. Spectroscopy and Spectral Analysis, 2022, 42(2): 470
- Spectroscopy and Spectral Analysis
- Vol. 42, Issue 2, 470 (2022)
Fig. 1. Experimental device
Fig. 2. Experimental result
(a): TEM image of silver sol; (b): Size distribution of silver nanoparticles
(a): TEM image of silver sol; (b): Size distribution of silver nanoparticles
Fig. 3. Experimental result
(a): The length of fiber microcavity varies with etching time; (b): Raman spectrum of R6G;(c): The composite Raman strength varies with etching time of fiber at 1 362 cm-1
(a): The length of fiber microcavity varies with etching time; (b): Raman spectrum of R6G;(c): The composite Raman strength varies with etching time of fiber at 1 362 cm-1
Fig. 4. Experimental process of the sol self-assembly method of optical fiber SERS probe
Fig. 5. SEM image of Ag/fiber-30 substrate at different areas
(a)—(f): 10~60 minutes in area a; (g)—(l): 10~60 minutes in area b
(a)—(f): 10~60 minutes in area a; (g)—(l): 10~60 minutes in area b
Fig. 6. Experimental results
(a): Raman spectra of 10-3 mol·L-1 R6G detected using fiber SERS substrates with different self-assembly times;(b): Enlarged figure of Raman intensity at 1 510 cm-1
(a): Raman spectra of 10-3 mol·L-1 R6G detected using fiber SERS substrates with different self-assembly times;(b): Enlarged figure of Raman intensity at 1 510 cm-1
Fig. 7. Sensitivity test on different substrates
(a): Nano-silver sol substrate; (b): Ag/Fiber-30 substrate
(a): Nano-silver sol substrate; (b): Ag/Fiber-30 substrate
Fig. 8. Relationship between Raman intensity and R6G concentration
(a): Nano-silver sol substrate;(b) Ag/Fiber-30 substrate (all the error bars were calculated based on five independent measurements)
(a): Nano-silver sol substrate;(b) Ag/Fiber-30 substrate (all the error bars were calculated based on five independent measurements)
Fig. 9. Reproducibility test results and RSD values of different substrates
(a): Nano-silver sol; (b): Ag/Fiber-30
(a): Nano-silver sol; (b): Ag/Fiber-30
Fig. 10. Experimental results
(a): Stability test of nano silver sol substrate; (b): Stability test of Ag/Fiber-30 substrate; (c)—(e): Raman spectra of R6G
(a): Stability test of nano silver sol substrate; (b): Stability test of Ag/Fiber-30 substrate; (c)—(e): Raman spectra of R6G
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Table 1. RSD values at different major peaks of R6G
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