Preparation of Plasmonic Ag@PS Composite via Seed-Mediated In Situ Growth Method and Application in SERS

Abstract

The colloidal polystyrene (PS) was synthesized and decorated with silver nanoparticles (Ag NPs). The plasmonic Ag@PS nanocomposite was prepared by loading Ag NPs on PS microsphere through a seed-mediated in situ growth route. The property of Ag NPs deposited on the PS microsphere could be precisely controlled by adjusting the concentration of the chemicals used in the growth medium. The growth step is only limited by the diffusion of growing species in the growth media to the surface of the Ag seed. The Ag@PS prepared via the in situ growth method exhibited two advantages compared with the self-assembled PS/Ag. First, the high-density of Ag NPs were successfully deposited on the surface of PS as the electroless-deposited Ag seed process, which brings nearly three times SERS enhancement. Second, the rapid preparation process for in situ growth method (half an hour, 10 h for the self-assembled method). The PS/Ag could detect Nile blue A (NBA) down to 10–7 M by SERS. Furthermore, the plasmonic Ag@PS SERS substrate was used for pesticide identification. The on-site monitoring malachite green (MG) from fish was achieved by portable Raman spectrometer, and the limit of detection (LOD) was 0.02 ppm. The Ag@PS substrate has also shown capability for simultaneously sensing multiple pesticides by SERS.

Synergistic impact of nanoplastics and nanopesticides on Artemia salina and toxicity analysis

“…Elemental mapping also conrmed their adsorption. 44 As seen in FE-SEM pictures, nanopermethrin was able to bind by monolayer adsorption on the outer surface of polystyrene as evidenced from isotherm studies. 3.3.5 X-ray diffraction.…”

Plasma Treatment of Polystyrene Films—Effect on Wettability and Surface Interactions with Au Nanoparticles

“…A variety of techniques, including wet chemistry, electro-plating, sonochemistry, and dewetting, have been employed by researchers to alter or coat the surface of polymers with metal nanoparticles [10][11][12][13]. Recently, nanosized patterns with enhanced structural stability were produced on gold surfaces using reversible addition-fragmentation chain transfer (RAFT) PS [14].…”

Fabrication of gold nanoparticles tethered in heat-cooled calf thymus-deoxyribonucleic acid Langmuir-Blodgett film as effective surface-enhanced Raman scattering sensing platform

“…Surface-enhanced Raman scattering (SERS) spectroscopy has now emerged as a fascinating analytical tool for the detection of molecules at trace concentrations in the limit of single molecule regime ( Nordlander et al, 2004 ; Kneipp et al, 2008 ; Hernandez-Sanchez et al, 2018 ; Tian et al, 2022 ). The reason behind the colossal enhancements of Raman bands is now been attributed to the collective response from the electromagnetic (EM) and charge transfer (CT) mechanisms, of which the former is considered to play a major role ( Sun et al, 2008 ; Chandra et al, 2013 ; Wu et al, 2014 ).…”