Engineered plasmonic Thue-Morse nanostructures for LSPR detection of the pesticide Thiram

Nanophotonics

Musto Pellegrino¹  Tkachenko Volodymyr²  Castagna Riccardo²  Rippa Massimo²  Zhou Jun²  Pannico Marianna²  Petti Lucia² 

[1] Institute for Polymers, Composites and Biomaterials of CNR, 80078 Pozzuoli, Italy;Institute of Applied Sciences and Intelligent Systems “E. Caianiello” of CNR, Via Campi Flegrei 34, 80078 Pozzuoli, Italy;

关键词: plasmonic;    nanostructures;    sensors;    lspr;    thiram;   

DOI  :  10.1515/nanoph-2016-0146

来源: DOAJ

【 摘 要 】

In this paper, the size- and shape-dependent spectral characteristics of plasmonic nanostructures based on the Thue-Morse (ThMo) sequence are investigated in theory and experiment. We designed, fabricated, and characterized nine different Au nanopillars (NPs) lattices to evaluate their use as nanosensors based on localized surface plasmon resonances (LSPR). The extinction spectra and the bulk refractive index sensitivity (m) are compared to three selected shapes of the NPs (square, circular, and triangular) with different minimum interparticle distance. The maximum m of 275 nm/RIU is obtained for a ThMo pattern with square NPs. Finally, a detection limit of 260 pM (62 pg/ml) of Thiram pesticide has been achieved using an LSPR nanosensor based on an optimized ThMo pattern with triangular NPs employing a phase-sensitive setup to increase the figure-of-merit (FOM) of the sensor.

【 授权许可】

Unknown