Lifang Xie, Jianglong Lu, Tao Liu, Ganyu Chen, Guokun Liu*, Bin Ren, and Zhongqun Tian. Key Role of Direct Adsorption on SERS Sensitivity: Synergistic Effect among Target, Aggregating Agent, and Surface with Au or Ag Colloid as Surface-Enhanced Raman Spectroscopy Substrate. J. Phys. Chem. Lett. 2020, 11(3): 1022–1029