A study of light induced surface reactions of sildenafil citrate on hybrid AgCl/Ag nanoparticle dimers by surface enhanced Raman scattering and pulse radiolysis techniques

Das, Sudip Kumar; Maiti, Namita; Dhayagude, Akshay C.; Pathak, Arup Kumar; Chadha, Ridhima; Neogy, S.; Kapoor, Sudhir

doi:10.1016/j.colsurfa.2019.123864

Cited by 14 publications

(5 citation statements)

References 64 publications

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“…In the TEM micrographs, the (Ag-AgCl)NPs hybrid nanoparticles can be observed in dark and light shades. Particles with darker shades are AgNPs, while lighter shades may be AgClNPs [42]. The dominant nanoparticles are from 5 to 15 nm Figure 4B.…”

Section: Transmission Electron Microscopy Resultsmentioning

confidence: 99%

Synthesis and Antimicrobial Activity of 3D Micro–Nanostructured Diatom Biosilica Coated by Epitaxially Growing Ag-AgCl Hybrid Nanoparticles

Bekissanova,

Railean,

Wojtczak

et al. 2023

Biomimetics

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The 3D (three-dimensional) micro–nanostructured diatom biosilica obtained from cultivated diatoms was used as a support to immobilize epitaxially growing AgCl-Ag hybrid nanoparticles ((Ag-AgCl)NPs) for the synthesis of nanocomposites with antimicrobial properties. The prepared composites that contained epitaxially grown (Ag-AgCl)NPs were investigated in terms of their morphological and structural characteristics, elemental and mineral composition, crystalline forms, zeta potential, and photoluminescence properties using a variety of instrumental methods including SEM (scanning electron microscopy), TEM (transmission electron microscopy), EDX (energy-dispersive X-ray spectroscopy), XRD (X-ray powder diffraction), zeta-potential measurement, and photoluminescence spectroscopy. The content of (AgCl-Ag)NPs in the hybrid composites amounted to 4.6 mg/g and 8.4 mg/g with AgClNPs/AgNPs ratios as a percentage of 86/14 and 51/49, respectively. Hybrid nanoparticles were evenly dispersed with a dominant size of 5 to 25 nm in composite with an amount of 8.4 mg/g of silver. The average size of the nanoparticles was 7.5 nm; also, there were nanoparticles with a size of 1–2 nm and particles that were 20–40 nm. The synthesis of (Ag-AgCl)NPs and their potential mechanism were studied. The MIC (the minimum inhibitory concentration method) approach was used to investigate the antimicrobial activity against microorganisms Klebsiella pneumoniae, Escherichia coli, and Staphylococcus aureus. The nanocomposites containing (Ag-AgCl)NPs and natural diatom biosilica showed resistance to bacterial strains from the American Type Cultures Collection and clinical isolates (diabetic foot infection and wound isolates).

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Section: Transmission Electron Microscopy Resultsmentioning

confidence: 99%

Synthesis and Antimicrobial Activity of 3D Micro–Nanostructured Diatom Biosilica Coated by Epitaxially Growing Ag-AgCl Hybrid Nanoparticles

Bekissanova,

Railean,

Wojtczak

et al. 2023

Biomimetics

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“…Localized surface plasmon resonance (LSPR) is a unique property of noble metal nanoparticles where incident electromagnetic radiation leads to collective oscillation of quasi-free surface electrons resulting in observation of characteristic color in noble metal nanoparticles [37].…”

Section: Uv-vis Absorption Spectroscopymentioning

confidence: 99%

Application of unlaminated EBT3 film dosimeter for quantification of dose enhancement using silver nanoparticle-embedded alginate film

Kakade¹,

Das²,

Kumar³

et al. 2022

Biomed. Phys. Eng. Express

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Purpose The paper describes the application of unlaminated Gafchromic EBT3 film dosimeter for quantification of dose enhancement using locally synthesized silver nanoparticle-embedded alginate film (AgNPs-Alg film) for nanoparticles-aided radiotherapy. Materials and Methods AgNPs-Alg film was synthesized and characterized using standard techniques. The unlaminated Gafchromic EBT3 film was specially customized for dosimetric measurement. The dose enhancements due to AgNPs-Alg film was experimentally determined for ISO wide spectrum X-rays series (average energy ranging from 57-137 keV) and 6 and 10 MV X-rays using laminated and unlaminated Gafchromic EBT3 film. The radiation dose of 1 Gy was delivered to a combination of AgNPs-Alg films and EBT3 film. Results Ultraviolet-Visible spectroscopy of silver nanoparticles shows a surface plasmon resonance peak at 400 nm. The average particle size of 13±2 nm was measured using Atomic Force Microscopy. For unlaminated film, the dose enhancements of 29%, 23%, 14% and 2% was observed for ISO wide spectrum X-rays having average energy of 57, 79, 104 and 137 keV, respectively. The dose enhancement was negligible for 6 and 10 MV X-rays. In the case of laminated film, no significant dose enhancement was measured for all the X-ray energies. Conclusion The unlaminated Gafchromic EBT3 film can be a suitable choice for the measurement of dose enhancement. Further, silver nanoparticles can be used during nanoparticle-aided radiotherapy when irradiated at low X-ray energy.

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“…LSP resonance refers to the coherent oscillation of conduction electrons of MNPs when excited by electromagnetic radiation, which has become an important subject in nanophotonics due to their remarkable ability to produce strong electromagnetic field near the MNPs surface. This remarkable property has led to the development of various ultrasensitive spectroscopic techniques including surface-enhanced Raman scattering (SERS). − In addition to this, LSP can also facilitate the conversion of parent molecules adsorbed onto MNPs surface into new molecules, known as plasmon-mediated chemical reactions (PMCRs). − The enormous growth and interest in the PMCR research field is fueled up after the discoveries of the chemical transformation of p -aminothiophenol ( p -ATP) or p -nitrothiophenol ( p -NTP) to 4, 4-dimercaptoazobenzene (DMAB) by the SERS technique. − Thereafter, some of the important works have demonstrated the diverse range of plasmon-induced reactions including condensation, dissociation of H 2 and dimethyl disulfide molecules, and oxidation and reduction reactions. ,,,− Toward the development of the PMCR, the reaction mechanism of LSP resonance (LSPR)-induced transformation of p -ATP to DMAB has also been continuously explored in the past. ,,,, Molecules other than p -ATP have been also investigated to explore the involved excitation mechanisms in PMCR. − ,,,,−…”

Section: Introductionmentioning

confidence: 99%

Insights into Plasmon-Induced Dimerization of Rhodanine–A Surface-Enhanced Raman Scattering Study

2023

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Plasmon-mediated chemical reactions (PMCRs) have attracted considerable interest in recent times. The PMCR initiated by hot carriers is known to be influenced by the type of metals and the excitation wavelength. Herein, we have carried out the surface-enhanced Raman scattering (SERS) investigation of rhodanine (Rd), an important pharmacologically active heterocyclic compound, adsorbed on silver and gold nanoparticles (AgNP and AuNP) using 514.5 and 632.8 nm lasers. The prominent Raman band at 1566 cm–1 observed in the SERS spectra is attributed to the characteristic ν(CC) stretching vibration of the Rd dimer and not of Rd tautomers. The chemical transformation of Rd to Rd dimer on metal surfaces is plausibly triggered by the indirect transfer of energetic hot electrons generated during the non-radiative decay of plasmon. The mechanism involved in the dimerization of Rd via the indirect transfer of hot electrons is also presented. The effect of wavelength on the dimerization of Rd is also observed on the AgNP surface, which indicates that the dimerization occurs more efficiently on the AgNP surface with excitation at 514.5 nm wavelength.

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A study of light induced surface reactions of sildenafil citrate on hybrid AgCl/Ag nanoparticle dimers by surface enhanced Raman scattering and pulse radiolysis techniques

Cited by 14 publications

References 64 publications

Synthesis and Antimicrobial Activity of 3D Micro–Nanostructured Diatom Biosilica Coated by Epitaxially Growing Ag-AgCl Hybrid Nanoparticles

Synthesis and Antimicrobial Activity of 3D Micro–Nanostructured Diatom Biosilica Coated by Epitaxially Growing Ag-AgCl Hybrid Nanoparticles

Application of unlaminated EBT3 film dosimeter for quantification of dose enhancement using silver nanoparticle-embedded alginate film

Insights into Plasmon-Induced Dimerization of Rhodanine–A Surface-Enhanced Raman Scattering Study

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