scholarly journals Orientation of 2,6-Dicarbethoxy-3,5-bis(pyridine-3-yl)tetrahydro-1,4-thiazine-1,1-dioxide on Silver Nanoparticles: Surface-Enhanced Raman Spectral Studies

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
M. Anuratha ◽  
A. Jawahar ◽  
M. Umadevi ◽  
N. Edayadulla ◽  
V. G. Sathe ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Spectral Feature ◽  
Lone Pair ◽  
Combustion Method ◽  
Spectral Studies ◽  
Silver Surface ◽  
Solution Combustion ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Lone Pair Electrons

Silver nanoparticles were synthesized using solution combustion method with citric acid as fuel. The prepared silver nanoparticles exhibit fcc crystalline structure with particle size of ~50 nm. The morphology and purity of the silver nanoparticles were also studied by high-resolution transmission electron microscopy (HRTEM) and energy dispersive X-ray analysis (EDX). Surface-enhanced Raman scattering (SERS) spectra of 2,6-dicarbethoxy-3,5-bis(pyridine-3-yl)tetrahydro-1,4-thiazine-1,1-dioxide (DBTD) adsorbed on silver nanoparticles were investigated. Orientation of DBTD on silver nanoparticles has been inferred from normal Raman spectrum (nRs) and SERS spectral feature. The observed spectral feature evidenced that DBTD would adsorb on silver surface with tilted orientation through the lone pair electrons of C–N, C=O, S=O, and pyridine ring. The present investigation has been a model system to deduce the interaction of drugs with DNA.

DFT and SERS Study of Adsorption of 1,4-Dimethoxy-2-nitro-3-methylanthracene-9,10-dione onto Silver Nanoparticles

2016 ◽  
Vol 69 (1) ◽  
pp. 76 ◽  
Author(s):  
K. Geetha ◽  
T. N. Rekha ◽  
M. Umadevi ◽  
Beulah J.M. Rajkumar ◽  
G.V. Sathe ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Combustion Method ◽  
Sers Spectrum ◽  
Vibrational Modes ◽  
Solution Combustion ◽  
Ag Nps ◽  
Transition Electron Microscopy ◽  
Surface Enhanced Raman ◽  
Silver Silver

Surface-enhanced Raman scattering (or spectroscopy), commonly known as SERS, has been employed to investigate the adsorption mechanism and orientation of 1,4-dimethoxy-2-nitro-3-methylanthracene-9,10-dione (DMNMAD) molecule onto silver. Silver nanoparticles (Ag NPs) were synthesized based on a solution combustion method using citric acid as a fuel. Scanning electron microscopy and transition electron microscopy studies confirm the crystalline nature and morphology of the synthesized silver nanoparticles. Theoretical normal Raman spectra (nRs) and SERS spectra of the DMNMAD molecule, simulated based on DFT/B3PW91 level of theory were validated experimentally. Experimental and theoretical vibrational modes correlate well, confirming the reliable assignments of the vibrational bands. Enhancement of C=O stretching and C–H in-plane vibrational modes in the SERS spectrum indicates the ‘stand-on’ orientation of the molecule on the silver nanoparticles after adsorption. The frontier molecular orbitals confirm the charge transfers between the molecule and silver nanoparticles following the process of adsorption. As anthraquinone derivatives have been recently used as potent anti-tumour drugs, the adsorption studies reported in the current investigation can pave way to the potential application of DMNMAD in drug delivery.

Silver oxide model surface improves computational simulation of surface-enhanced Raman spectroscopy on silver nanoparticles

2021 ◽  
Author(s):  
Scott G. Harroun ◽  
Yaoting Zhang ◽  
Tzu-Heng Chen ◽  
Huan-Tsung Chang ◽  
Alexis Vallée-Bélisle
Keyword(s):  
Raman Spectroscopy ◽  
Silver Nanoparticles ◽  
Silver Oxide ◽  
Accurate Result ◽  
Computational Simulation ◽  
Surface Enhanced Raman Spectroscopy ◽  
Model Surface ◽  
Surface Enhanced ◽  
Model Surfaces ◽  
Surface Enhanced Raman

For simulation of SERS on silver nanoparticles, Ag2O can provide a more accurate result than standard model surfaces such as Ag+, Ag, Ag4+ and Ag4.

scholarly journals Reusable Surface-Enhanced Raman Spectroscopy Substrates Made of Silicon Nanowire Array Coated with Silver Nanoparticles Fabricated by Metal-Assisted Chemical Etching and Photonic Reduction

Nanomaterials ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1531 ◽  
Author(s):  
Shi Bai ◽  
Yongjun Du ◽  
Chunyan Wang ◽  
Jian Wu ◽  
Koji Sugioka
Keyword(s):  
Silver Nanoparticles ◽  
Chemical Etching ◽  
Silicon Nanowire ◽  
Nanowire Array ◽  
Surface Enhanced Raman Spectroscopy ◽  
Sers Substrate ◽  
Silicon Nanowire Array ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Metal Assisted Chemical Etching

Surface-enhanced Raman spectroscopy (SERS) has advanced over the last four decades and has become an attractive tool for highly sensitive analysis in fields such as medicine and environmental monitoring. Recently, there has been an urgent demand for reusable and long-lived SERS substrates as a means of reducing the costs associated with this technique To this end, we fabricated a SERS substrate comprising a silicon nanowire array coated with silver nanoparticles, using metal-assisted chemical etching followed by photonic reduction. The morphology and growth mechanism of the SERS substrate were carefully examined and the performance of the fabricated SERS substrate was tested using rhodamine 6G and dopamine hydrochloride. The data show that this new substrate provides an enhancement factor of nearly 1 × 108. This work demonstrates that a silicon nanowire array coated with silver nanoparticles is sensitive and sufficiently robust to allow repeated reuse. These results suggest that this newly developed technique could allow SERS to be used in many commercial applications.

Rapid organic solvent extraction coupled with surface enhanced Raman spectroscopic mapping for ultrasensitive quantification of foliarly applied silver nanoparticles in plant leaves

2020 ◽  
Vol 7 (4) ◽  
pp. 1061-1067
Author(s):  
Zhiyun Zhang ◽  
Ming Xia ◽  
Chuanxin Ma ◽  
Huiyuan Guo ◽  
Wenhao Wu ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Organic Solvent ◽  
Mapping Technique ◽  
Plant Leaves ◽  
Raman Spectroscopic ◽  
Organic Solvent Extraction ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Spinach Leaf ◽  
Leaf P

An organic solvent-based extraction approach coupled with surface enhanced Raman spectroscopic mapping technique to quantify silver nanoparticles in spinach leaf.

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