Microfluidics and Solid-phase microextraction (SPME) effects were studied to reveal the rapid and sensitive detecting mechanism of Surface Enhanced Raman Scattering (SERS) microfluidic chips with polydimethylsiloxane (PDMS)-gold plasmonic nanostructure arrays for malathion detection in water. Coupled Microfluidics and SPME effects including Laminar flow, mass transfer, and mass adsorption phenomena were modeled and simulated using Comsol Multiphysics software. The simulation results show that microfluidics effect reduces the diffusion-convection balance time rapidly which thus improves the detecting effective, and that SPME effect increases the analyte concentration on the SERS hot spot dramatically which thus improves the detecting sensitivity. Low concentration pesticide malathion in water (1 ppb - 10 ppb) was detected to verify the performance enhancement.
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