Plasmonic 3-D wrinkled polymeric shrink film-based SERS substrates for pesticide detection on real-world surfaces

Abstract

The continuous and excessive use of agrochemicals for the crop improvement and protection has raised a widespread concern, as they exert adverse effects on human health and local environment. Surface...

Plasmonic gold dogbone nanorattles sniff out trace molecules through surface enhanced Raman scattering

“…By utilizing the created shrink film SERS substrate, the SERS spectra of BDT at varying concentrations were analyzed. The Raman bands appearing at 1062 cm −1 and 1180 cm −1 can be attributed to the C–S stretching vibration and C–H bending modes, respectively, while the band at 1559 cm −1 corresponds to the stretching of C–C bonds 18,24 (as depicted in Fig. 7A & B).…”

“…6E (in red colour). On the other hand, the XRD pattern of the bare shrink film showed diffraction peaks only at 2θ values of 19.2°and 29.5°, corresponding to the crystalline planes of β (300) and α (060), respectively, which are characteristic peaks of polypropylene 18,36 (Fig. 6E; in black colour).…”

“…6,13,[15][16][17] It is well known that the presence of sharp tips, edges, and corners on the surface of plasmonic metal nanoparticles can increase the generation of electromagnetic hotspots through the phenomenon of localized surface plasmon resonance (LSPR). 3,18,19 LSPR arises from the collective oscillations of the free electrons in the metal nanoparticle under the influence of incident light. The electromagnetic fields generated by these oscillations are highly localized at the tips, edges, and corners of the nanoparticle due to the strong confinement of the electron density.…”

“…Thus, the degree of hotspot enhancement is highly dependent on the shape of the nanoparticle in addition to its size and chemical composition. 7,15,[20][21][22] Therefore, the presence of sharp tips, edges, and corners on plasmonic metal nanoparticles can increase the efficiency of electromagnetic hotspot generation, which is desirable for a range of applications such as SERS sensing, [23][24][25] catalysis, 5,26 and bioimaging. 9,22 The present work describes the synthesis of a nanorattle, designated as a gold dogbone nanorattle (Au-DBNRT), which consists of a solid gold dogbone shaped core and a thin, porous gold shell.…”

“…Thus, the degree of hotspot enhancement is highly dependent on the shape of the nanoparticle in addition to its size and chemical composition. 7,15,20–22 Therefore, the presence of sharp tips, edges, and corners on plasmonic metal nanoparticles can increase the efficiency of electromagnetic hotspot generation, which is desirable for a range of applications such as SERS sensing, 23–25 catalysis, 5,26 and bioimaging. 9,22…”