Surface-Enhanced Raman Scattering Studies on Aggregated Silver Nanoplates in Aqueous Solution

Abstract

Four different sizes of citrate-protected silver nanoplates with the corresponding in-plane dipole resonance band at 530, 619, 778, and 858 nm, respectively, are synthesized for surface-enhanced Raman scattering (SERS) study. Their aggregation behaviors are monitored by use of UV-vis spectroscopy. During the aggregation process, a marked red shift of the in-plane dipole resonance of silver nanoplates is observed, whereas other resonance modes of them only have small alterations in the site or intensity. Aggregated silver nanoplates can serve as active SERS substrates with an enhancement factor of about 4.5 x 10(5) using 2-aminothiophenol as a probing molecule. The SERS performance of silver nanoplates is even superior to the commonly used Lee-Meisel silver colloid, making them very attractive for SERS applications.

Surface‐enhanced Raman scattering spectroscopy via gold nanostars

“…Therefore, we have estimated a rough lower limit EF for certain modes by comparing the signal intensities in the measured SERS spectrum of 2-MPy on nanostars to the bulk Raman spectrum of the molecule. The following expression [13,29] was used to estimate the EF:…”

Optical Properties and Growth Aspects of Silver Nanoprisms Produced by a Highly Reproducible and Rapid Synthesis at Room Temperature

“…[1,6] Two potential applications of this field enhancement are Surface Enhanced Fluorescence (SEF) [7][8][9][10][11][12] and Surface Enhanced Raman Spectroscopy (SERS). [13,14] The degree of enhancement is dependent on a number of factors. One of these is shape.…”

“…The syntheses that exist for the production of silver nanoprisms can be generally placed into either of two categories: photochemical (plasmon-driven synthesis) [24][25][26][27][28] and thermal. [13,[29][30][31][32][33][34][35][36][37][38] Photochemical syntheses have produced the highest quality samples to date but this approach typically involves days for the preparation of a sample. Thermal approaches are much quicker but often produce samples with a range of shapes and sizes.…”

SERS detection of explosive agent by macrocyclic compound functionalized triangular gold nanoprisms

“…On one hand, according to previous analogous investigations on different sized silver triangular prisms, the inplane dipole resonance of gold nanoprisms, which is located at the lower-energy region in contrast to the dipole resonance of silver nanospheres, can appear as an obvious red shift in the maximum of the aggregated silver nanoplates. [43] Moreover, the red-shift phenomena can be much more easily observed accompanied by an increase of the size in the sized-controllable silver nanoprisms. Additionally, as observed from the UV-Vis absorption band of 1,4-phenylenediisocyanide (PDI) covered gold nanoparticles with different sizes in the previous report, [44] both high-energy and low-energy absorption band can be red-shifted and broadened; furthermore, the aggregation level should increase when the size of gold nanoparticles is increased from 6 to 97 nm.…”