SERS and RRS Spectral Detection of Ultratrace Sulfite Based on PtPd Nanoalloy Catalytic Amplification

• Published in: Plasmonics (Norwell, Mass.) Vol. 15; no. 6; pp. 2043 - 2052
• Main Authors: Wang, Haolin, Liu, Qiwen, Chen, Chunqiang, Wen, Guiqing, Liang, Aihui, Jiang, Zhiliang
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.12.2020; Springer Nature B.V
• Subjects: Amplification; Biochemistry; Biological and Medical Physics; Biophysics; Biotechnology; Catalysis; Chemistry; Chemistry and Materials Science; Coupled modes; Ethanol; Gold; Nanoalloys; Nanoparticles; Nanotechnology; Noble metals; Raman spectroscopy; Catalytic amplification; RRS/SERS; SO; PtPd; AuNPs
• ISSN: 1557-1955; 1557-1963
• DOI: 10.1007/s11468-020-01226-3

At temperature of 75 °C, the ethanol-HAuCl 4 reaction to generate gold nanoparticles is relatively slow (AuNPs), and the noble metal nanoparticles can catalyze this nanoreaction. Sulfite can reduce PdCl 2 -H 2 PtCl 6 to generate PtPd nanoalloy (PtPd) and strong catalysis to generate red AuNPs, which has a strong RRS peak at 370 nm. When Victoria blue 4R (VB4R) is added, it produced a strong SERS peak at 1617 cm −1 . We use SERS, RRS, absorption spectroscopy, electron microscopy, and other techniques to study the catalytic reaction of PtPd nanoalloy and propose a new mechanism for the nanoalloy catalytic reactions. When the SO 3 2− concentration in the system gradually increases, the AuNPs produced by the catalytic reaction gradually increase and the RRS/SERS peak intensity increases linearly. Based on the nanoalloy catalytic amplification strategy, a new and sensitive RRS/SERS coupled dual-mode detection method for SO 3 2− was constructed, with linear range of 0.13–12.1 μg·L −1 and a DL of 0.02 μg·L −1 .