Fig. 4From: Preparation of Stabilizer-Free Silver Nanoparticle-Coated Micropipettes as Surface-Enhanced Raman Scattering Substrate for Single Cell DetectionCharacterization of the SERS micropipettes with different tip angles. a Comparison of the normalized peak intensity at 592 cm−1 from the tip to the column end on micropipettes. b The process schematic of formation of the metal membrane on micropipettesBack to article page