The controlled synthesis of plasmonic nanoparticle clusters as efficient surface-enhanced Raman scattering platforms

2015 ◽  
Vol 51 (42) ◽  
pp. 8793-8796 ◽  
Author(s):  
Seunghoon Lee ◽  
Jong Wook Hong ◽  
Su-Un Lee ◽  
Young Wook Lee ◽  
Sang Woo Han
Keyword(s):  
Ag Nanoparticles ◽  
Au Nanoparticle ◽  
Galvanic Replacement ◽  
Controlled Synthesis ◽  
Plasmonic Nanoparticle ◽  
Surface Enhanced ◽  
Nanoparticle Clusters ◽  
Surface Enhanced Raman ◽  
Fine Control ◽  
Enhanced Raman Scattering

Au nanoparticle clusters were prepared by fine control over the galvanic replacement of Ag nanoparticles with Au precursors.

Fast assembling microarrays of superparamagnetic Fe3O4@Au nanoparticle clusters as reproducible substrates for surface-enhanced Raman scattering

Nanoscale ◽  
2015 ◽  
Vol 7 (32) ◽  
pp. 13427-13437 ◽  
Author(s):  
Min Ye ◽  
Zewen Wei ◽  
Fei Hu ◽  
Jianxin Wang ◽  
Guanglu Ge ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Au Nanoparticle ◽  
Sers Substrates ◽  
Surface Enhanced ◽  
Nanoparticle Clusters ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

A method featuring fast assembling microarrays of superparamagnetic Fe3O4@Au nanoparticle clusters as highly reproducible SERS substrates is reported.

scholarly journals Spatial Separation of Plasmonic Hot Electron Generation and a Hydrodehalogenation Reaction Center Using a DNA Wire

2021 ◽  
Author(s):  
Sergio Kogikoski Junior ◽  
Anushree Dutta ◽  
Ilko Bald
Keyword(s):  
Spatial Separation ◽  
Decomposition Reaction ◽  
Charge Carriers ◽  
Hot Electrons ◽  
Hot Electron ◽  
Plasmonic Nanoparticle ◽  
Double Stranded Dna ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

<p>Using hot charge carriers far from a plasmonic nanoparticle surface is very attractive for many applications in catalysis and nanomedicine, and will lead to a better understanding of plasmon-induced processes, such as hot charge carrier or heat driven chemical reactions. Herein we show that DNA is able to transfer hot electrons generated by a silver nanoparticle over several nanometers to drive a chemical reaction in a molecule non-adsorbed on the surface. For this we use 8-bromo-adenosine introduced in different positions within a double stranded DNA oligonucleotide. The DNA is also used to assemble the nanoparticles into superlattices enabling the use of surface enhanced Raman scattering to track the decomposition reaction. To prove the DNA mediated transfer, the probe molecule was insulated from the charge carriers source, which hindered the reaction. The results indicate that DNA can provide an attractive platform to study the transfer of hot electrons, leading to the future development of more advanced plasmonic catalysts. </p>

scholarly journals Development of Effectual Substrates for SERS by Nanostructures-on flexible surfaces

2021 ◽  
Vol 2114 (1) ◽  
pp. 012084
Author(s):  
Hammad R. Humud ◽  
Fatimah Jumaah Moaen
Keyword(s):  
Raman Scattering ◽  
Ag Nanoparticles ◽  
Surface Enhanced Raman Scattering ◽  
Wave Number ◽  
Plasmonic Nanostructures ◽  
Sers Substrate ◽  
Two Dimensional ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Abstract The current study examines recent advancements in surface-enhanced Raman scattering (SERS), a technique that employs flexible surfaces as an active substrate, this surfaces consist from two-dimensional thermo-plasmonic grating. With 53 nm Au layer (was deposited on the 2D grating structure of the PDMS by the PVD method). The explosive wire technique was used to preparing Ag nanoparticles that were used for the purpose of SERS. The effect of the plasmonic nanostructures on the absorption spectra and Surface - Enhanced Raman Scattering (SERS) activities was examined. Rhodamine 6G dye was used as a probe molecule. X-Ray diffraction (XRD) was used to examine the structural characteristics of the nanoparticles. The morphology was assessed using Field Emission Scanning Electron Microscopy(FESEM). A twin beam UV-Vis Spectrophotometer was used to measure the absorption of the combined Rh6G dye (concentration 1×10“–6M) with the nanostructures. a Sunshine Raman microscope system and a 50mm objective lens, used for investigating the Raman spectra of the Rh6G combined with nanostructures. The results showed that the enhancement factor (EF) for SERS of R6G (1×M) reached to (2.2×10 3) When using Ag nanoparticles and (0.08 × 103) when R6G deposited directly on the flexible substrates without nanostructures at the wave number (1650 cm−1), we produced a recyclable, homogeneous, and highly sensitive SERS substrate with dependable reproducibility. For the SERS substrate, a surface made up of two-dimensional (2D) flexible grating substrates was chosen to provide multiple modalities in electrical and medicinal applications.

scholarly journals Nanoporous Ag-Au Bimetallic Triangular Nanoprisms Synthesized by Galvanic Replacement for Plasmonic Applications

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Hongmei Qian ◽  
Shoaib Anwer ◽  
G. Bharath ◽  
Shahid Iqbal ◽  
Lijuan Chen
Keyword(s):  
Metallic Nanoparticles ◽  
Galvanic Replacement ◽  
Transmission Electron ◽  
Surface Plasmon Coupling ◽  
Surface Enhanced ◽  
Particle Aggregates ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Good Biocompatibility ◽  
Elementary Mapping

Galvanic replacement is a versatile method of converting simple noble metallic nanoparticles into structurally more complex porous multimetallic nanostructures. In this work, roughened nanoporous Ag-Au bimetallic triangular nanoprisms (TNPs) are synthesized by galvanic replacement between smooth Ag triangular plates and AuCl4− ions. Transmission electron microscope and the elementary mapping measurements show that numerous protrusions and pores are formed on the {111} facets, and Ag and Au atoms are homogeneously distributed on the triangular plates. Due to the additional “hot spots” generated by the surface plasmon coupling of the newly formed protrusions and pores, the roughened nanoporous Ag-Au TNP aggregates demonstrate a higher surface-enhanced Raman scattering enhancement factor (seven times larger) and better reproducibility than that of smooth Ag triangular particle aggregates. These synthesized roughened nanoporous Ag-Au bimetallic TNPs are a promising candidate for the applications in analytical chemistry, biological diagnostics, and photothermal therapy due to their excellent plasmonic performances and good biocompatibility.

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