Ordered arrays of Ag nanodendrite clusters as effective surface-enhanced Raman scattering substrates

Abstract

Large-area ordered Ag nanodendrite cluster tetragonal arrays have been achieved on a Zn plate via galvanic replacement reaction.

A general strategy to prepare SERS active filter membranes for extraction and detection of pesticides in water

“…Consequently, fast and sensitive methods for the detection of these pesticides are needed. Spectroscopic methods based on surface-enhanced Raman scattering (SERS) are among the alternative analytical tools that have been exploited in the last years for detecting the presence of dithiocarbamates [19][20][21][22][23][24][25][26][27][28][29][30][31][32]. A crucial aspect in these approaches has been the type of nanostructured substrate employed in the SERS analysis.…”

Evaluation of 3D gold nanodendrite layers obtained by templated galvanic displacement reactions for SERS sensing and heterogeneous catalysis

“…The corresponding oxidation of the sacrificial substrate occurs spatially separated from the reduction of the precious metal atoms and results in partial dissolution of the sacrificial substrate. Silver and gold dendrites were obtained by GDRs on sacrificial aluminum, 4, 9 copper, 5,11,12 zinc, 2,13,33 and nickel 3 substrates. If aqueous plating solutions containing HF and tetrachloroaurate cations are brought into contact with silicon surfaces, gold is deposited by a GDR whereas the silicon is partially oxidized to [SiF6] 2-.…”

“…[4][5][6] Furthermore, precious metal nanodendrites possess morphological features like sharp edges and vertices as well as nanoscale junctions that enable highly efficient preconcentration sensing by surface-enhanced Raman scattering (SERS). 1,4,[7][8][9][10][11][12][13] SERS is related to the enhancement of electromagnetic fields caused by surface plasmons of metal substrates exhibiting plasmon resonances in the visible spectral range. [14][15][16][17] SERS enables trace analysis as well as in situ monitoring of molecular processes because the Raman scattering intensity originating from analytes attached to SERS-active metals and, consequently, the corresponding detection sensitivities are drastically increased.…”

Review—Surface-Enhanced Raman Scattering Sensors for Food Safety and Environmental Monitoring

“…This SERS substrate was employed to detect multiple trace organic pollutants (methyl parathion and 2,4-D) simultaneously. Meng's group have also developed the Ag nanohemisphere array, 75,76,83 the silver nanosheet-assembled cubes array, 70 and the silver dendrite clusters on the patterned sites 90 for direct detection of pesticides and plasticizers. Antibiotics like potassium benzylpenicillin was measured with the self-assembled silver colloid film.…”

“…To achieve signal uniformity and reproducibility, large-area ordered nanostructures are desirable. Periodic nanostructure arrays on solid substrates have been developed using self-assembly, [63][64][65][66][67][68][69] electrodeposition, [70][71][72][73] template-assisted fabrication, [74][75][76][77][78][79][80][81][82][83][84][85][86][87][88][89] lithography, 70,[90][91][92][93][94][95] and skeletonassisted methods. [96][97][98][99][100][101][102][103][104][105] Resonance with excitation light.-When LSPR band is overlapped the wavelength of the excitation light, that is, the plasmon is in resonance with the excitation light, it can enhance SERS activity.…”