Synthesis of hydrophilic SERS-imprinted membrane based on graft polymerization for selective detection of L-tyrosine

摘要

The major limitation of polyvinylidene difluoride (PVDF-)-sensor membrane is its high hydrophobicity. In this study, a hydrophilic PVDF sensor membrane is synthesized by graft modification. The engineered poly-vinypyrrolidone (PVP) chains are linked with copolymerized N-vinyl-2-pyrrolidone (NVP) and triethox-yvinylsilane (VTES) by hydrolysis condensation. Subsequently, Ag nanoparticles (NPs) are immobilized on the surface of PVDF membrane through the reduction of AgNO_3, and the membrane is utilized as the SERS substrate. Meanwhile, to improve the practical detection efficiency, molecular imprinting technique (MIT) is utilized to obtain a SERS-imprinted membrane for selective detection of L-tyrosine. The morphology and property of SERS-imprinted membrane are analyzed through various techniques. The analysis results suggest that the SERS-imprinted membrane is hydrophilic and is useful for the selective detection of L-tyrosine in aqueous medium. Overall, this study establishes a novel technique for the synthesis of hydrophilic sensor membrane and boosts its applications in SERS detection.