Gold nanoparticle nanofibres as SERS substrate for detection of methylene blue and a chemical warfare simulant (methyl salicylate)

Flexible polymer (polyvinyl alcohol, PVA) nanofibres achieved with electrospinning and loaded with picosecond laser-ablated gold nanoparticles (Au NPs) were utilized as surface-enhanced Raman scattering (SERS) substrates. The fabricated polymer nanofibres and Au NPs were characterized by UV-Visible absorption, field emission scanning electron microscope, transmission electron microscopy and X-ray diffraction techniques. The PVA-Au NPs SERS substrates were used to detect the dye methylene blue (MB 5 mu M) and a chemical warfare agent simulant (methyl salicylate) using a portable Raman spectrometer. The flexible PVA-Au NPs nanofibre exhibited a good sensitivity with enhancement factors of >10(4) and a high reproducibility (RSD similar to 10%). These flexible substrates could be extended for SERS studies of various explosive and other hazardous molecules.

Automated summary

Flexible polymer nanofibres loaded with gold nanoparticles were used as surface-enhanced Raman scattering substrates for detecting dyes and chemical substances, showing good sensitivity and reproducibility. These flexible substrates could be further applied for studying explosive and hazardous molecules in SERS.