scholarly journals One Step Fabrication of Highly Absorptive and Surface Enhanced Raman Scattering (SERS) Silver Nano-trees on Silicon Substrate

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Sara Abdel Razek ◽  
Ahmed B. Ayoub ◽  
Mohamed A. Swillam
Keyword(s):  
Raman Scattering ◽  
Ethylene Glycol ◽  
Silicon Substrate ◽  
Enhancement Factor ◽  
High Sensitivity ◽  
Surface Enhanced Raman Scattering ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
One Step ◽  
Enhanced Raman Scattering

Abstract Silver Nano-trees (AgNTs) were synthesized by one-step electroless method with different densities via water or ethylene glycol (EG) on silicon substrate in one minute. The density of AgNTs is controlled by changing the concentration of silver nitrate in etchant solution. The absorption of NTs fabricated via EG is higher than absorption of NTs without EG. The AgNTs are employed as substrates for surface-enhanced Raman scattering (SERS) and exhibit high sensitivity. The silver Nano-trees fabricated via ethylene glycol (AgNTs-EG) enhances the Raman spectrum of pyridine (Py) with higher enhancement factor. Moreover, the SERS-active substrates prepared by using EG were able to detect Pyridine with concentration as low as 0.005 mM, the ones fabricated by water could only detect Pyridine at concentration of 0.2 mM.

scholarly journals Detection of Organic Substances by a SERS Method Using a Special Ag-Poly(Chloro-P-Xylylene)-Ag Sandwich Substrate

Coatings ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 799
Author(s):  
Irina Boginskaya ◽  
Aliia Gainutdinova ◽  
Alexey Gusev ◽  
Karen Mailyan ◽  
Anton Mikhailitsyn ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Sandwich Structures ◽  
Control Sample ◽  
Film Surface ◽  
High Sensitivity ◽  
Surface Enhanced Raman Scattering ◽  
Silver Layer ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Spectroscopy based on surface enhanced Raman scattering (SERS) is widely used as a method with extremely high sensitivity for molecular and chemical analysis. We have developed thin-film sandwich structures, in which, when used as sensitive elements for detecting organic compounds at low concentrations, high-amplitude spectra of surface enhanced Raman scattering are observed. Using gas-phase cryochemical synthesis and thermal sputtering in vacuum, SERS active sandwich structures Ag–poly(chloro-p-xylylene)–Ag (Ag–PCPX–Ag) were obtained. In the process of creating sandwich structures, the upper silver film takes the form of a complex island topology with submicron sizes. A series of samples were made with different thicknesses of the polymer and upper silver layers. SERS spectra of the analyte chemically adsorbed on the film surface were obtained, demonstrating a significant amplification (up to 104) compared with the control sample. The dependence of the gain on the silver concentration is characterized by a maximum polymer layer thickness of 600 nm and a 30 nm thick upper silver layer. A selective amplification of the low molecular weight compound spectra with respect to proteins was observed. A semi-empirical model is proposed that is in good agreement with the experimental results.

scholarly journals Surface-Enhanced Raman Scattering (SERS) Studies of Disc-on-Pillar (DOP) Arrays: Contrasting Enhancement Factor with Analytical Performance

2019 ◽  
Vol 73 (6) ◽  
pp. 665-677 ◽  
Author(s):  
Raymond A. Velez ◽  
Nickolay V. Lavrik ◽  
Ivan I. Kravchenko ◽  
Michael J. Sepaniak ◽  
Marco A. De Jesus
Keyword(s):  
Raman Scattering ◽  
Enhancement Factor ◽  
Surface Enhanced Raman Scattering ◽  
Analytical Performance ◽  
Interparticle Spacing ◽  
Localized Surface Plasmon ◽  
Sers Substrate ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

The use of nanomachining methods capable of reproducible construction of nano-arrayed devices have revolutionized the field of plasmonic sensing by the introduction of a diversity of rationally engineered designs. Significant strides have been made to fabricate plasmonic platforms with tailored interparticle gaps to improve their performance for surface-enhanced Raman scattering (SERS) applications. Over time, a dichotomy has emerged in the implementation of SERS for analytical applications, the construction of substrates, optimization of interparticle spacing as a means to optimize electromagnetic field enhancement at the localized surface plasmon level, and the substrate sensitivity over extended areas to achieve quantitative performance. This work assessed the enhancement factor of plasmonic Ag/SiO2/Si disc-on-pillar (DOP) arrays of variable pitch with its analytical performance for quantitative applications. Experimental data were compared with those from finite-difference time-domain (FDTD) simulations used in the optimization of the array dimensions. A self-assembled monolayer (SAM) of benzenethiol rendered highly reproducible signals (RSD ∼4–10%) and SERS substrate enhancement factor (SSEF) values in the orders of 106–108 for all pitches. Spectra corresponding to rhodamine 6G (R6G) and 4-aminobenzoic acid demonstrated the advantages of using the more densely packed DOP arrays with a 160 nm pitch (gap = 40 nm) for quantitation in spite of the strongest SSEF was attained for a pitch of 520 nm corresponding to a 400 nm gap.

One-step growth of needle and dendritic gold nanostructures on silicon for surface enhanced Raman scattering

CrystEngComm ◽  
2012 ◽  
Vol 14 (4) ◽  
pp. 1241-1246 ◽  
Author(s):  
Abhishek Lahiri ◽  
Rui Wen ◽  
Surasak Kuimalee ◽  
Shin-ichiro Kobayashi ◽  
Hyonkook Park
Keyword(s):  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Gold Nanostructures ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
One Step ◽  
Enhanced Raman Scattering ◽  
Step Growth

Structural Dynamics of a Single Photoreceptor Protein Molecule Monitored With Surface-Enhanced Raman Scattering Substrates

2008 ◽  
Vol 1077 ◽  
Author(s):  
Kushagra Singhal ◽  
Karthik Bhatt ◽  
Zhouyang Kang ◽  
Wouter Hoff ◽  
Aihua Xie ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Single Molecule ◽  
Enhancement Factor ◽  
Protein Molecule ◽  
Surface Enhanced Raman Scattering ◽  
Initial Study ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Halorhodospira Halophila

ABSTRACTPhotoactive yellow protein (PYP) is a small cytosolic photoreceptor that actuates the negative phototactic response in its host organism Halorhodospira halophila. It has an optical absorption maximum at 446 nm (blue light). We report an initial study of the photocycle of PYP at the single molecule level using “high enhancement factor” surface-enhanced Raman scattering (SERS)-active nanostructures with 514 nm laser excitation. The SERS-active “nanometal-on-semiconductor” structures are prepared employing a redox technique on thin germanium films, coated on glass slides. Single molecule spectra are observed in terms of sudden appearance of discernable Raman peaks with spectral fluctuations. The single molecule spectra capture protonation, photo-isomerization, and H-bond breaking - the steps that are instrumental in the photocycle of PYP. This is indicative of single PYP molecules diffusing to high-enhancement-factor SERS sites, and undergoing photo-cycle under 514 nm excitation.

Sign in / Sign up

Export Citation Format

Share Document