Fig. 1. Schematic diagram of the preparation of the AgNCs/PDMS substrate via three-phase self-assemble method^[31]

Fig. 2. Schematic diagrams of AgNPs phase transfer, droplet deposition and transfer process^[34]

Fig. 3. Typical preparation process of Ag/AuNWs/PDMS film and its application for on-site assay of pesticides under various conditions^[35]

Fig. 4. Schematic diagram of the fabrication of BP-Au FP-based SERS substrates and its application in the detection of analytes and three foodborne bacteria^[37]

Fig. 5. Schematic diagram of the fabrication process of SERS substrate based on F-AgNDs and OTMOS^[38]

Fig. 6. Schematic diagram of the synthesis of ESM coated with AuNPs^[39]

Fig. 7. Schematic diagram of the synthesis of lotus leaf based SERS substrate^[40]

Fig. 8. Schematic diagram of the synthesis of Ag/WL substrate and the SEM image of the part of the WL^[41]

Fig. 9. Schematic diagram of the synthesis of cellulose textile-AgNPs substrate^[47]

Fig. 10. Schematic diagrams of the deposition process and Raman signal detection of silver coated cotton fabric sample^[48]

Fig. 11. Schematic diagram of the deposition process of rGO coated cotton fabric sample^[49]

Fig. 12. Schematic diagrams of the preparation process and Raman signal detection of superhydrophobic Ag coated cotton fabric substrate^[50]

Fig. 13. Schematic diagram of the fabrication process of the flexible AgNTs@Cu mesh SERS substrate^[52]

Fig. 14. Schematic diagrams of Ag nanodendrites/Cu mesh SERS substrate. (a) Schematic diagram of Ag nanodendrites structures deposited on Cu mesh; (b) detection mechanism of glucose by SERS compared with fructose and galactose^[53]