An AuNPs modified photonic crystal microfluidic chip for acetamiprid and myclobutanil detection

To address the limitations of traditional pesticide detection methods, including reliance on costly equipment, operational complexity, and time-consuming procedures, an AuNPs-modified Photonic Crystal (AuPC) microfluidic chip is proposed for sensitive and rapid detection of acetamiprid and myclobutanil. A Photonic Crystal (PC) sensor functionalized with AuNPs was developed. Numerical simulations revealed that AuNPs modification significantly enhanced localized electric field intensities, generating high-density electromagnetic hotspots in microsphere gaps, with a maximum field enhancement of 4.8-fold compared to unmodified counterparts. The sensor demonstrated a detection limit of 10−4 g L−1 for both analytes, with linear concentration-dependent spectral red shifts (R2 > 0.96) observed across 1 g L−1 to 10−4 g L−1. Sensitivity enhancement was achieved through synergistic photonic-plasmonic interactions, and a microfluidic-integrated PC platform was constructed, enabling efficient pesticide residue screening.