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Compared with the single metal, multi-metallic nanoparticles (NPs) have excellent localized surface plasmon resonance (LSPR) with a wide spectral range response, which is beneficial to improve photoinduced electron transfer efficiency and promote effective electron-hole separation. In this paper, the urchin-like Au-Ag-Pt-Pd nanoalloys (Au-Ag-Pt-Pd NUs) with multiple tentacles were successfully synthesized by the seed growth method and chemical reduction method. And we explored the optical properties of Au-Ag-Pt-Pd NUs at different annealing temperatures. The results showed that the transient photocurrent intensity of Au-Ag-Pt-Pd NUs annealed at 200℃ is 1.6 times that of the initial Au-Ag-Pt-Pd NUs at 808 nm excitation. In addition, the SERS signal intensity of crystal violet (CV) adsorbed on Au-Ag-Pt-Pd NUs annealed at 200℃ was 1.8 times that of the initial Au-Ag-Pt-Pd NUs at 785 nm excitation. Based on Au-Ag-Pt-Pd NUs in this work, the concentration of CV can be detected as low as 10-12 M. Furthermore, the interesting NIR-SERS sensor enables the detection limit of H2O2 at low concentration, (0.09-1.02 μmol/L). The results showed that the obtained nanoalloys had excellent photoelectric response characteristics and high SERS sensitivity due to the synergistic effect of multi-metals. Thus, it holds great potential for biological NIR detection in the future.

Research on near infrared photoelectric response and surface-enhanced Raman scatteringof urchin-like Au-Ag-Pt-Pd nanoalloy