 exhibited SERS peaks at 000 cm^−0^, 000 cm^−0^, 0000 cm^−0^, 0000 cm^−0^, 0000 cm^−0^, 0000 cm^−0^, 0000 cm^−0^ and 0000 cm^−0^. Among them, the SERS peak at 0000 cm^−0^ is the biggest, and the SERS peak intensity linearly increased with the concentration of AuNP~B~ increasing ([Fig. S00](#S0){ref-type="supplementary-material"}). 