Formation and Properties of Polystyrene-block-poly(2-cinnamoylethyl methacrylate) Brushes Studied by Surface-Enhanced Raman Scattering and Transmission Electron Microscopy

1997 ◽  
Vol 30 (5) ◽  
pp. 1442-1448 ◽  
Author(s):  
Jianfu Ding ◽  
Viola I. Birss ◽  
Guojun Liu
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Transmission Electron ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Gold/Palladium and Silver/Palladium Colloids as Novel Metallic Substrates for Surface-Enhanced Raman Scattering

2005 ◽  
Vol 59 (2) ◽  
pp. 194-199 ◽  
Author(s):  
Barbara Pergolese ◽  
Adriano Bigotto ◽  
Maurizio Muniz-Miranda ◽  
Giuseppe Sbrana
Keyword(s):  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Colloidal Nanoparticles ◽  
Visible Absorption ◽  
Transmission Electron ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Silver Palladium ◽  
Silver Colloidal Nanoparticles

New surface-enhanced Raman scattering (SERS) substrates, composed of gold or silver colloidal nanoparticles doped with palladium, were prepared. These novel colloids are stable and maintain a satisfactory SERS efficiency, even after long aging. The interest in doping the coinage metal nanoparticles with palladium is due to the well-known catalytic activity of this metal. Transmission electron microscopy (TEM) and ultraviolet–visible absorption spectroscopy were used to characterize the shape and size of the metal particles. It was found that these bimetallic colloidal nanoparticles have a core–shell structure, with gold or silver coated with palladium clusters.

Fabrication of Gold Nanoflowers and the Surface Enhanced Raman Scattering Performance

2014 ◽  
Vol 881-883 ◽  
pp. 944-947
Author(s):  
Chun Rong Wang ◽  
Xian Zai Yan ◽  
Lili Yu ◽  
Jian Dan Li
Keyword(s):  
Electron Microscopy ◽  
Raman Scattering ◽  
Sodium Dodecyl ◽  
Sodium Dodecyl Benzene Sulfonate ◽  
Surface Enhanced Raman Scattering ◽  
Gold Nanoflowers ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Diffraction Patterns

Gold nanoflowers were simply produced in aqueous solution containing peptides (NH2-Leu-Aib-Trp-Ome) and sodium dodecyl benzene sulfonate. HAuCl4 was reduced by peptides. Scanning electron microscopy and transmission electron microscopy images show flower-like nanoparticles were about 50-100 nm. X-ray diffraction and electron diffraction patterns suggest face-centred cubic structures for these gold branched nanoparticles. There are three main stages in the growth of the gold nanoparticles: nanocrystal, aggregated nanoparticle, and flower-like nanostructure. The performance of the gold nanoflowers when used for surface enhanced Raman scattering was explored using crystal violet as the probe, which indicates that the these gold nanoflowers are promising for use as excellent surface enhanced Raman scattering substrates.

Surface Enhanced Raman Scattering (SERS) Effects of 4-Aminothiophenol on Au Nanoparticles with Different Shapes

2020 ◽  
Vol 20 (9) ◽  
pp. 5959-5963 ◽  
Author(s):  
Xiaochuan Xu ◽  
Xiaofang Liu ◽  
Min He ◽  
Bin Liu ◽  
Jianhui Yang
Keyword(s):  
Catalytic Activity ◽  
Raman Scattering ◽  
Au Nanoparticles ◽  
Surface Enhanced Raman Scattering ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Different Shapes

Au nanoparticles with different shapes (nanosphere, nanoplate and nanorod) have been synthesized and were characterized by scanning electron microscope, transmission electron microscopy, X-ray diffraction and UV-vis absorption spectroscopy. We investigated the catalytic activity of Au nanoparticles with different morphologies as surface-enhanced Raman scattering substrates for the conversion of p-aminothiophenol to p,p′-dimercaptoazobenzene. The experimental results indicated that the order of catalytic activity is nanorod> nanoplate> nanosphere under 633 and 785 nm excitation. The current research provides some reliable insights and important references for exploration new catalysts and their catalytic activities from the perspectives of different sizes, morphology and crystal composition of nanomaterials.

scholarly journals Signature of Plasmonic Nanostructures Synthesised by Electrical Exploding Wire Technique on Surface-Enhanced Raman Scattering

2021 ◽  
pp. 167-179
Author(s):  
Fouad G. Hamzah ◽  
Hammed R Mahmood
Keyword(s):  
Electron Microscopy ◽  
Raman Scattering ◽  
Absorption Spectra ◽  
Surface Enhanced Raman Scattering ◽  
Plasmonic Nanostructures ◽  
Exploding Wire ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Prepared Nanostructures

This work aims to fabricate two types of plasmonic nanostructures by electrical exploding wire (EEW) technique and study the effects of the different morphologies of these nanostructures on the absorption spectra and Surface-Enhanced Raman Scattering (SERS) activities, using Rhodamine 6G as a probe molecule. The structural properties of these nanostructures were examined using X-Ray diffraction (XRD). The morphological properties were examined using field emission scanning electron microscopy (FESEM) and scanning transmission electron microscopy (STEM). The absorption spectra of the mixed R6G laser dye (concentration 1×10-6 M) with prepared nanostructures were examined by double beam UV-Vis Spectrophotometer. The Raman spectra of the R6G mixed with the prepared nanostructures were examined using a Horiba HR Evolution 800 Raman microscope system with an objective lens (50 ×). The FESEM and STEM images indicated that the Ag nanoparticles (AgNPs) with 35 nm average particle sizes were decorated on the surface of the AgNWs and the PDA layer by EEW technique, forming AgNW@AgNPs and AgNW@PDA@AgNPs nanostructures. The results indicated that the increased intensities of the absorption spectra peaks and the SERS arise from the hot spots and the roughness of the surface of nanostructures. The SERS enhancement factor of R6G (1×10-6 M) was reached at 2.3×107 and 2.5×107, at the wave number of 1650 cm-1, for the AgNW@AgNPs and AgNW@PDA@AgNPs nanostructures, respectively, after being excited by (λexc. = 532 nm) laser source. It can be concluded that the AgNW@AgNPs and AgNW@PDA@AgNPs nanostructures were fabricated with an easy and simple way without the need for additional chemical compounds. These nanostructures attained a reliable and sensitive detection and can be utilized in a variety of SERS applications, such as chemical and biological sensors.

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