Morphology Dependence on Surface-Enhanced Raman Scattering Using Gold Nanorod Arrays Consisting of Agglomerated Nanoparticles

Abstract

Highly ordered arrays of vertically aligned Au nanorod arrays consisting of agglomerated nanoparticles are fabricated by porous anodic aluminum oxide (AAO) template-assisted electrochemical deposition. The Au nanorod arrays with rough surfaces are then transformed to smooth surfaces by a subsequent thermal annealing step. The surface-enhanced Raman scattering (SERS) intensity of the Au nanorod arrays with rough and smooth surfaces was compared to investigate the morphology dependence of SERS. The Au nanorod arrays with agglomerated structures demonstrated a highly active SERS effect as abundant nanogaps are created uniformly by combination of hot spots caused by both agglomerated porous structures on each nanorod and inter-rod gaps

An Overview of Anodic Oxides Derived Advanced Nanocomposites Substrate for Surface Enhance Raman Spectroscopy

“…Because of the advantages of using AAO in nanostructure fabrication (like low cost, facile, and recurrent), a lot of research groups study the possibility of utilizing these materials in SERS substrate production. An ultrathin AAO membrane (up to 100 nm thick) was used to produce nanodots, nanowires, or metallic nanowires with plasmonic properties, and samples prepared in this way were used as SERS substrates [72][73][74][75][76][77][78][79]. Successful attempts were also made to produce SERS flexible substrates using AAO matrices [20,80,81].…”

“…Kim et al [76] fabricated a highly ordered array of Au nanorod arrays consisted of agglomerated nanoparticles by porous anodic aluminum oxide (AAO) templateassisted electrochemical deposition. That prepared SERS substrate was tested for 1 mM 4-methylbenzenethiol (4-MBT) detection in three systems: Au nanorod arrays with agglomerated structures after removing AAO template, smooth structures after removing AAO template, and agglomerated structures before removing AAO template.…”

Assorted Dimensional Reconfigurable Materials

“…Because of the advantages of using AAO in nanostructure fabrication (like low cost, facile, and recurrent), a lot of research groups study the possibility of utilizing these materials in SERS substrate production. An ultrathin AAO membrane (up to 100 nm thick) was used to produce nanodots, nanowires, or metallic nanowires with plasmonic properties, and samples prepared in this way were used as SERS substrates [72][73][74][75][76][77][78][79]. Successful attempts were also made to produce SERS flexible substrates using AAO matrices [20,80,81].…”

SERS Signal Enhancement of Methylene Blue‐embedded Agglomerated Gold Nanorod@SiO2 Core@Shell Composites

“…It has emerged as a noninvasive imaging technique for medical diagnostics due to its high chemical specificity at the molecular level, realtime monitoring capability, and low maintenance cost compared to magnetic resonance imaging and computed tomography. [3][4][5] Recently, we reported that methylene-blue-embedded gold nanorod@SiO 2 (MB-GNR@SiO 2 ) core@shell nanostructures exhibited near-infrared (NIR) light-induced SERS performance with a Raman enhancement factor of 3 × 10 10 . 1,2 This could considerably reduce the diagnostic accuracy due to increasing signal-to-noise ratios.…”

“… This could considerably reduce the diagnostic accuracy due to increasing signal‐to‐noise ratios. One strategy to amplify weak Raman signals is to use metal‐nanoparticles‐based surface‐enhanced Raman scattering (SERS) that could enhance a Raman signal by a factor of 10 8 –10 14 . Recently, we reported that methylene‐blue‐embedded gold nanorod@SiO 2 (MB‐GNR@SiO 2 ) core@shell nanostructures exhibited near‐infrared (NIR) light‐induced SERS performance with a Raman enhancement factor of 3 × 10 10 .…”