An efficient double template strategy to construct large-area and highly ordered silver “urchin-like” arrays for sensitive SERS analysis

Applications of surface‐enhanced Raman spectroscopy in environmental detection

“…Their properties can be controlled by engineering the nanoparticle shape, size and distance from other particles 52 . The small gaps between the nanoparticles have enhanced electromagnetic fields, leading to the generation of SERS hot spots across a three‐dimensional (3D) structure 53 . Large areas of 3D nanoparticle arrays have been used successfully for SERS detection 54–58 .…”

“…Large areas of 3D nanoparticle arrays have been used successfully for SERS detection 54–58 . In a study by Li et al., high area and highly ordered silver ‘urchin‐like’ arrays were created to detect CV and thiram (THR) in real water environments 53 . The nanoparticle array was formed through an easy and cost‐effective double template method involving an ultra‐thin alumina membrane mask and a self‐assembled polystyrene (PS) template.…”

Emergence of Surface-Enhanced Raman Scattering Probes in Near-Infrared Windows for Biosensing and Bioimaging

“…126,127 AuNSs contain multiple sharp peaks, which can significantly enhance the local electromagnetic field due to the tip-enhanced plasmonic effect. 35 Compared with other gold nanoparticle shapes, the design of the AuNSs can result in the enhancement of the SERS signals, excellent photothermal conversion efficiency, and a highly concentrated heating effect. 128 They were designed and integrated to have multiple functionalities with a greatly enhanced LSPR effect under NIR illumination.…”

“…The study showed the NIR SERS nanoprobes could generate strong SERS signals with high reproducibility, and the detectable signals could be acquired from animal tissues with a penetration depth up to 8 mm. Meanwhile, the existence of sharp edges and tips can provide high sensitivity changes of a local dielectric environment, leading to larger enhancements of the electric field around the nanoparticles, which are essential for the SERS analysis and LSPR. , On the basis of the features caused by sharp edges and tips, an increasing number of synthetic procedures was developed by controlling the size/shape distribution. On the basis of that study, the same group further reported branched Au nanostars (AuNSs), which were synthesized by seeded growth .…”

Facile and robust fabrication of hierarchical Au nanorods/Ag nanowire SERS substrates for the sensitive detection of dyes and pesticides

“…14,15 The enhanced EM field is often triggered around rough surfaces, tips and interparticle gaps (<5 nm) between metal nanostructures. Regular 3D nanopatterns including hexagonally hemisphere nanoarrays, 16 nanohump arrays, 17 bi-nanoring arrays, 18 nanopillars 19,20 and other three-dimensional nanostructures 21–26 with complex shapes and accurate nanogaps are usually good SERS substrates. However, the preparation of these substrates needs laborious protocols and expensive equipment, such as the electron beam evaporation technique, 16 high density plasma etching system, 19 electron beam lithography 23 and focused ion beam lithography, 24 which makes them less competitive in certain applications.…”