Understanding chemical interaction between phosphonate-derivative molecules and a silver surface cluster in SERS: a combined experimental and computational approach

2019 ◽  
Vol 21 (40) ◽  
pp. 22180-22187 ◽  
Author(s):  
Gauthier Emonds-Alt ◽  
Benoit Mignolet ◽  
Cedric Malherbe ◽  
Jean-Christophe M. Monbaliu ◽  
Francoise Remacle ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Chemical Interaction ◽  
Computational Approach ◽  
Silver Surface ◽  
Surface Cluster ◽  
Adsorption Mode

This joint experimental-theoretical SERS study provides new insights on the adsorption mode of phosphonate-derivative molecules on silver nanoparticles.

scholarly journals Acute hepatotoxicity and drug/chemical interaction toxicity of 10-nm silver nanoparticles in mice

2019 ◽  
Vol 6 (2) ◽  
pp. 37-44
Author(s):  
Katsuhiro Isoda ◽  
Naoki Kobayashi ◽  
Yuichiro Taira ◽  
Ikuko Taira ◽  
Yoshimi Shimizu ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Chemical Interaction

Silver nanoparticles linked by a Pt-containing organometallic dithiol bridge: study of local structure and interface by XAFS and SR-XPS

2014 ◽  
Vol 16 (23) ◽  
pp. 11719-11728 ◽  
Author(s):  
C. Battocchio ◽  
I. Fratoddi ◽  
L. Fontana ◽  
E. Bodo ◽  
F. Porcaro ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Local Structure ◽  
Chemical Interaction

Silver nanoparticles (AgNPs) functionalized with an organometallic bifunctional thiol, leading to 2D networks, were investigated by SR-XPS and XAFS with the aim to probe the nature of the chemical interaction between the ligand and Ag atoms on the NPs surface.

scholarly journals Instrumental Characterization and Antibacterial Investigation of Silver Nanoparticles Synthesized From Garcinia Kola Leaf

2019 ◽  
Vol 9 (6-s) ◽  
pp. 58-64 ◽  
Author(s):  
Sunday Adewale AKINTELU ◽  
Aderonke Similoluwa FOLORUNSO ◽  
Olabisi Theresa ADEMOSUN
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Surface Plasmon ◽  
Silver Nanoparticle ◽  
Nitrate Solution ◽  
Diffusion Method ◽  
Average Particle ◽  
Silver Surface ◽  
Garcinia Kola ◽  
X Ray

The need to devise another method of synthesizing nanoparticles from sources that are eco-friendly, non-hazardous and cost effectiveness is of great importance in preventing environmental and health problems. The aim of this study was to evaluate the efficiency of Garcinia kola leaves as reducing and stabilizing agent for silver nanoparticles synthesis. The leaves of Garcinia kola obtained were authenticated, air dried, pulverized and extracted. The extract was mixed with aqueous solution of silver nitrate solution to form silver nanoparticles and were characterized using Ultra violet (UV) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). The antibacterial investigation of the synthesized silver nanoparticle was carried out following the disk diffusion method. UV analysis revealed the silver surface plasmon band at 425.18 nm, The FTIR indicated -OH, -C=C- and alkane as the functional groups responsible for the stabilization of the silver nanoparticle formed. The morphological assessment from SEM and TEM analysis confirmed that the silver nanoparticle formed are spherical in shape with an average particle size of 28.80nm.The EDX analysis ascertained that the silver surface plasmon resonance at 2.8–3.2 keV was confirmed the reduction of silver ion (Ag+ to Ag0). The XRD study revealed the crystalline nature of the nanoparticles synthesized. The antibacterial investigation showed high inhibition against the growth of tested bacteria.  This study ascertained that the green synthesis of silver nanoparticle without the use of harmful solvent that are offensive to the environment is achievable.  Keywords: Silver nanoparticles, Biosynthesis, Characterization, Antibacterial activity and Garcinia kola.

scholarly journals Green synthesis of Ag/TiO2 Nanocomposite Assisted by Gambier Leaf (Uncaria gambir Roxb) Extract

2019 ◽  
Vol 22 (6) ◽  
pp. 250-255 ◽  
Author(s):  
Sry Wahyuni ◽  
Syukri Syukri ◽  
Syukri Arief
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Diffuse Reflectance Spectroscopy ◽  
Irradiation Time ◽  
Rutile Phase ◽  
X Ray Diffraction ◽  
Silver Surface ◽  
X Ray ◽  
Synthesis Of Nanoparticles ◽  
Vis Spectroscopy

Studies of green synthesis of nanoparticles mediated by plants extract is extensively explored and studied in recent time due to eco-friendliness, cost-effectiveness, and use a minimum amount of toxic chemicals in the process of inorganic material synthesis. In this study, the immobilization of silver nanoparticles on the surface of titanium dioxide (TiO2) was carried out using Uncaria gambier Roxb. leaf extract as a silver ion (Ag+) reducing agent. The synthesized Ag/TiO2 nanocomposite was characterized by UV-Vis spectroscopy, X-ray diffraction (XRD), and Diffuse Reflectance Spectroscopy (DRS). The formation of silver nanoparticles was confirmed through UV-Vis spectroscopic analysis, which showed a silver surface plasmon resonance (SPR) band at 426 nm. The X-ray diffraction pattern shows that Ag can inhibit the transition of the anatase into rutile phase. The presence of Ag particles in TiO2 can increase the absorption ability from an initial wavelength of 407 nm to 438 nm. Based on the results of Rhodamin B degradation, it can be seen that Ag/TiO2 has a higher photocatalytic activity than bare TiO2 with 99% percent degradation at 120 minutes of irradiation time.

scholarly journals Synthesis of silver nanoparticles on a solid surface using a classical photographic method

2021 ◽  
Author(s):  
Saif Al-Alul
Keyword(s):  
Silver Nanoparticles ◽  
Action Spectrum ◽  
Systematic Investigation ◽  
Photographic Method ◽  
Scanning Electron Micrographs ◽  
Silver Surface ◽  
Silver Plate ◽  
Nanoparticle Production ◽  
Direct Excitation ◽  
Nanoparticle Morphology

A classical photographic method, the Becquerel method, produces a positive image comprised of silver nanoparticles on a silver surface. The particles are grown by exposing an iodised silver plate to light in the blue or ultraviolet, which initiates the formation of particles, followed by development (growth) with light in the red portion of the spectrum. Because the Becquerel method is essentially a means of producing a surface of patterned nanoparticles, it also has potential technological applications. This thesis is a systematic investigation of the Becquerel method. . It was determined that the initiation of nanoparticles is effective for wavelengths in the range 447 to 254 nm. The sudden rise in nanoparticle production around 447 nm implicates direct excitation of the AgI layer in the initiation step; however, the behaviour of the action spectrum at shorter wavelengths implies an electron-mediated mechanism. It is possible that both direct excitation and electron-mediated processes occur in the ultraviolet. Scanning electron micrographs indicate that nanoparticle morphology may be dependent on the initiation wavelength, with longer wavelengths producing a variety of shapes, while shorter wavelengths produce primarily dots. Nanoparticle growth (development) was achieved with all wavelengths studied; however, shorter wavelengths photons were more effective than longer wavelengths. The results from a study of the aging of the AgI film suggested that there is period of one or two days during which the film ‘matures,’ becoming more effective for nanoparticle production.

Raman of indigo on a silver surface. Raman and theoretical characterization of indigo deposited on silicon dioxide-coated and uncoated silver nanoparticles

2017 ◽  
Vol 50 (6) ◽  
pp. 316-321
Author(s):  
Guillermo Corales ◽  
Freddy Celis ◽  
Juan S. Gómez-Jeria ◽  
Marcelo Campos ◽  
José J. Cárcamo-Vega
Keyword(s):  
Silver Nanoparticles ◽  
Silicon Dioxide ◽  
Silver Surface ◽  
Theoretical Characterization

scholarly journals Synthesis of silver nanoparticles on a solid surface using a classical photographic method

2021 ◽  
Author(s):  
Saif Al-Alul
Keyword(s):  
Silver Nanoparticles ◽  
Action Spectrum ◽  
Systematic Investigation ◽  
Photographic Method ◽  
Scanning Electron Micrographs ◽  
Silver Surface ◽  
Silver Plate ◽  
Nanoparticle Production ◽  
Direct Excitation ◽  
Nanoparticle Morphology

A classical photographic method, the Becquerel method, produces a positive image comprised of silver nanoparticles on a silver surface. The particles are grown by exposing an iodised silver plate to light in the blue or ultraviolet, which initiates the formation of particles, followed by development (growth) with light in the red portion of the spectrum. Because the Becquerel method is essentially a means of producing a surface of patterned nanoparticles, it also has potential technological applications. This thesis is a systematic investigation of the Becquerel method. . It was determined that the initiation of nanoparticles is effective for wavelengths in the range 447 to 254 nm. The sudden rise in nanoparticle production around 447 nm implicates direct excitation of the AgI layer in the initiation step; however, the behaviour of the action spectrum at shorter wavelengths implies an electron-mediated mechanism. It is possible that both direct excitation and electron-mediated processes occur in the ultraviolet. Scanning electron micrographs indicate that nanoparticle morphology may be dependent on the initiation wavelength, with longer wavelengths producing a variety of shapes, while shorter wavelengths produce primarily dots. Nanoparticle growth (development) was achieved with all wavelengths studied; however, shorter wavelengths photons were more effective than longer wavelengths. The results from a study of the aging of the AgI film suggested that there is period of one or two days during which the film ‘matures,’ becoming more effective for nanoparticle production.

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.

scholarly journals SILVER NANOPARTICLES AND COCONUT OIL INCORPORATED BIOPOLYMER BASED ELECTROSPUN NANOFIBERS FOR WOUND DRESSING

2021 ◽  
pp. 204-209
Author(s):  
SUBHASHREE SAHOO ◽  
JOGABRATA TRIPATHY ◽  
AFRASIM MOIN ◽  
MEENAKSHI S. ◽  
SIDDARAMAIAH ◽  
...  
Keyword(s):  
Wound Healing ◽  
Silver Nanoparticles ◽  
Chemical Interaction ◽  
Coconut Oil ◽  
Electrospun Nanofibers ◽  
Reduced Form ◽  
Ag Nps ◽  
Disk Diffusion Assay ◽  
Zones Of Inhibition ◽  
Oil Concentration

Objective: The main aim of this study was to develop and evaluate the nanofiber loaded with coconut oil and silver nanoparticles (Ag NPs) for the treatment of wound healing by the electrospun method. Methods: The nanofibers have been created using the reduced form of silver nanoparticles and coconut oil along with Eudragit L-100 by the electrospun method. The presence of coconut oil and chemical interaction was determined by the FTIR method. XRD was made to evaluate the crystalline nature of AgNPs and Eudragit L-100. TEM was carried out to show the presence of AgNPs on the surface of nanofibers and SEM represents the diameter of the fiber. The antibacterial activity of nanofibers was carried out using a disk diffusion assay. Results: The diameter of the fibers was diminished by the excess of AgNPs in the fibers, while it increases by the coconut oil concentration, enhancing the nanofiber's hydrophilicity. FTIR spectroscopy was found in the range of coconut oil at 3553 cm-1for O-H stretch, 1365 cm-1, and 1240 cm-1 for the C-O stretch of ester groups. The diffraction peaks at 2θ of 38.5°, 44.6°, and 64.7°, in the XRD spectra of nanofiber, changed with silver NP affirming the total decrease of Ag salt. The bactericidal activity has been carried out between Escherichia coli and Staphylococcus aureus showing zones of inhibition of 20.0±0.2 mm and 14.8±0.4 mm, exhibiting excellent bactericidal characteristics for wound healing. Conclusion: The formulated nanofibers were obtained to offer protection against external agents and help in the regeneration of new tissue.

Adsorption mode of neurotensin family peptides onto a colloidal silver surface: SERS studies

2012 ◽  
Vol 44 (3) ◽  
pp. 355-361 ◽  
Author(s):  
Edyta Proniewicz ◽  
Yukihiro Ozaki ◽  
Younkyoo Kim ◽  
Leonard M. Proniewicz
Keyword(s):  
Colloidal Silver ◽  
Silver Surface ◽  
Adsorption Mode
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