Repression of photomediated morphological changes of silver nanoplates

Roh, Jinkyu; Umh, Ha Nee; Sung, Hwa Kyung; Lee, Byoungcheun; Kim, Younghun

doi:10.1016/j.colsurfa.2012.09.018

Cited by 16 publications

(8 citation statements)

References 19 publications

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“…Introduction of sodium hydroxide into the reaction mixture significantly improved the SERS intensity by the stabilization effect. The stabilization effect of the hydroxide could be attributed to its ability to inhibit the hydrolysis of citrate . But excess of OH − successively acted as a buffer to suppress the release of Ag + and oxidation of citrate.…”

Section: Resultsmentioning

confidence: 99%

Photochemical method for decoration of silver nanoparticles on filter paper substrate for SERS application

Panneerselvam

Yang

2014

J Raman Spectroscopy

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A facile photoreduction strategy to attach silver nanoparticles on filter paper (AgNPs@FP) to form surface‐enhanced Raman scattering (SERS) substrate array was proposed and examined. As prepared, SERS substrate array was applied to detect low concentration of adenine and other nucleobases in aqueous solutions. In addition, the formed SERS substrate array allows mass analysis of aqueous samples with a requirement of only 10 μL in sample volume. To optimize and understand the parameters in preparations, factors such as the concentrations of citrate and silver nitrate, photoreduction time, and concentration of sodium hydroxide were varied and examined. Para‐nitrothiophenol was used as a Raman probe molecule and scanning electron microscope (SEM) images of the substrates were used to explore the influences of experimental factors in the preparation of SERS array. Results indicated that silver ions could be effectively reduced and deposited in/on filter paper with the presence of citrate. The formed AgNPs@FP exhibits a three‐dimensional structure as the particles formed on and beneath the surface of the cellulosic fibers could be observed. Deposition of analyte on restricted substrate array rendered reproducible results and the spot‐to‐spot SERS intensity varied within 8%. At optimal conditions, the substrate enhancement factor approached 107. We demonstrated that the filter paper‐based SERS substrates can be used as a suitable tool for biological analysis, and a limit of detection better than 160 nM was obtained in detection of adenine molecules in aqueous solutions with a linear range up to 20 μM. Copyright © 2014 John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 99%

Photochemical method for decoration of silver nanoparticles on filter paper substrate for SERS application

Panneerselvam

Yang

2014

J Raman Spectroscopy

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“…There is a red shi compared to that of pure Ag nanoparticles. 48,49 It is evident that the red shi is due to the formation of ZnO/Ag nanocomposites. The plasmon absorption of silver l p is represented by the following equation: 50…”

Section: Characterization Of As-prepared Samplesmentioning

confidence: 99%

Selective synthesis of different ZnO/Ag nanocomposites as surface enhanced Raman scattering substrates and highly efficient photocatalytic catalysts

et al. 2015

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ZnO/Ag nanocomposites with adjustable surface-enhanced Raman scattering performance and photocatalytic activity were synthesized by a photochemical method. The as-prepared samples were investigated by using various spectroscopic and microscopic techniques in detail. Solvents play a key role in controlling the morphologies and properties of these nanocomposites. Detection and degradation of 10 organic dyes is studied. It has been found that the suitable experiment parameter is crucial to detection and degradation of organic dyes molecules. The work is of great importance in the practical application based on the surface-enhanced Raman scattering and photocatalytic performance of noble metal/oxide metal nanocomposites, which could be used for detection and degradation of organic dyes and pollutants.

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“…AgNPs have multiple effects, for example, AgNPs induce neuronal differentiation in human neuroblastoma cells [26,27] and AgNPs induce cell death through generation of reactive oxygen species, which is a major cause of nanoparticles-induced cell death in a variety of cancer cells including human breast cancer cells [28], human lung cancer cells [29] and human ovarian cancer cells [30]. Besides these, AgNPs induce cytotoxicity, alterations in signaling pathways [31,32], mitochondrial dysfunction [33], production of reactive oxygen species (ROS), depletion of various antioxidants, increased lipid peroxidation and accumulation of autophagosomes [34], inflammasome formation [35], apoptosis, and necrosis [36]. Frequent exposure to AgNPs from different products leads to an accumulation of AgNPs in the body and subsequently in the brain after crossing the blood brain barrier (BBB) [37,38].…”

Section: Introductionmentioning

confidence: 99%

Mitochondrial Peptide Humanin Protects Silver Nanoparticles-Induced Neurotoxicity in Human Neuroblastoma Cancer Cells (SH-SY5Y)

Gurunathan

Jeyaraj

Kang

et al. 2019

IJMS

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The extensive usage of silver nanoparticles (AgNPs) as medical products such as antimicrobial and anticancer agents has raised concerns about their harmful effects on human beings. AgNPs can potentially induce oxidative stress and apoptosis in cells. However, humanin (HN) is a small secreted peptide that has cytoprotective and neuroprotective cellular effects. The aim of this study was to assess the harmful effects of AgNPs on human neuroblastoma SH-SY5Y cells and also to investigate the protective effect of HN from AgNPs-induced cell death, mitochondrial dysfunctions, DNA damage, and apoptosis. AgNPs were prepared with an average size of 18 nm diameter to study their interaction with SH-SY5Y cells. AgNPs caused a dose-dependent decrease of cell viability and proliferation, induced loss of plasma-membrane integrity, oxidative stress, loss of mitochondrial membrane potential (MMP), and loss of ATP content, amongst other effects. Pretreatment or co-treatment of HN with AgNPs protected cells from several of these AgNPs induced adverse effects. Thus, this study demonstrated for the first time that HN protected neuroblastoma cells against AgNPs-induced neurotoxicity. The mechanisms of the HN-mediated protective effect on neuroblastoma cells may provide further insights for the development of novel therapeutic agents against neurodegenerative diseases.

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Repression of photomediated morphological changes of silver nanoplates

Cited by 16 publications

References 19 publications

Photochemical method for decoration of silver nanoparticles on filter paper substrate for SERS application

Photochemical method for decoration of silver nanoparticles on filter paper substrate for SERS application

Selective synthesis of different ZnO/Ag nanocomposites as surface enhanced Raman scattering substrates and highly efficient photocatalytic catalysts

Mitochondrial Peptide Humanin Protects Silver Nanoparticles-Induced Neurotoxicity in Human Neuroblastoma Cancer Cells (SH-SY5Y)

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