Role of capping agents in controlling silver nanoparticles size, antibacterial activity and potential application as optical hydrogen peroxide sensor

Ajitha, B.; Reddy, Y. Ashok Kumar; Reddy, P. Sreedhara; Jeon, Hwan‐Jin; Ahn, Chi Won

doi:10.1039/c6ra03766f

Cited by 192 publications

(119 citation statements)

References 45 publications

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“…An example of this is the different effect on its antibacterial properties that changes if the NPs are coated with monosaccharides (glucose or galactose) or disaccharides (maltose or lactose); the latter showed greater antibacterial effectiveness . By other side, shape, size, and Z potential were evaluated for different capping agents such as polyethylene glycol, ethylenediaminetetraacetic acid, polyvinyl pyrrolidone, and polyvinyl alcohol . In the synthesis with honey or glucose solutions, this monosaccharide reacts with Ag + cations to produce Ag 0 and d ‐gluconate, in alkaline conditions.…”

Section: Introductionmentioning

confidence: 99%

“…[5] By other side, shape, size, and Z potential were evaluated for different capping agents such as polyethylene glycol, ethylenediaminetetraacetic acid, polyvinyl pyrrolidone, and polyvinyl alcohol. [6] In the synthesis with honey or glucose solutions, this monosaccharide reacts with Ag + cations to produce Ag 0 and D-gluconate, in alkaline conditions. This anion can act as a stabilizing agent, together with the excess of αand β-D-glucose present in the synthesis media.…”

Section: Introductionmentioning

confidence: 99%

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Surface enhancement Raman spectroscopy and density functional theory study of silver nanoparticles synthetized with d‐glucose

Fá

López–Corral

Faccio

et al. 2018

J Raman Spectroscopy

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The role of α‐ and β‐d‐glucose, and d‐gluconate anion, acting as capping agent, on silver nanoparticles (AgNPs) was evaluated using both Raman and density functional theory studies. The particles were synthetized employing glucose, as reducing and blocking agent, in alkaline conditions. Capping agents were characterized through surface enhancement Raman spectroscopy together with modeling performed using silver clusters. Several geometries were optimized, and its energies and wavenumbers were calculated for each of them. Vibration normal modes from d‐glucose isomers and d‐gluconate were obtained and compared with those reported in bibliography, showing a satisfactory correlation. Comparison between experimental and calculated frequencies reveals a preference for d‐gluconate anion acting as capping agent under the necessary presence of d‐glucose on the surface of the AgNPs. The study of energies shows a greater affinity of d‐gluconate for the silver atoms (above −1.3 eV for both geometries) than for other configurations of the glucose molecule (about −0.66 eV in the case of α‐d‐glucose).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Surface enhancement Raman spectroscopy and density functional theory study of silver nanoparticles synthetized with d‐glucose

Fá

López–Corral

Faccio

et al. 2018

J Raman Spectroscopy

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“…Heavy metals are frequently used as base for nanoparticles, such as silver [76][77][78][79][80], gold [81][82][83][84][85][86], cadmium, zinc or tellurium [87,88]. Silver nanoparticles (Ag-NP) in general have a broad field of application, as they are antibacterial, antiviral, and antifungal.…”

Section: Nanomaterialsmentioning

confidence: 99%

“…Nevertheless, the issue of their toxicity has not been fully resolved [76]. The oxidation (degradation) of Ag-NP (Ag • to Ag + ) by H 2 O 2 was utilized for several different detection schemes [77,78,89]; however, one paper concludes that the oxidation of Ag-NPs is in fact much faster with OCl − than with H 2 O 2 [90], thus oxidation-based Ag-NPs might not always be suitable for measuring H 2 O 2 . Gold nanoparticles (Au-NP) are also frequently applied in optical sensing due to their biocompatibility, size-tunable optical properties, stability, and ease of preparation and conjugation [81].…”

Section: Nanomaterialsmentioning

confidence: 99%

Possibilities and Challenges for Quantitative Optical Sensing of Hydrogen Peroxide

2017

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Abstract:Hydrogen peroxide (H 2 O 2 ) plays a key role in many biological processes spanning from coral bleaching, over cell signaling to aging. However, exact quantitative assessments of concentrations and dynamics of H 2 O 2 remain challenging due to methodological limitationsespecially at very low (sub µM) concentrations. Most published optical detection schemes for H 2 O 2 suffer from irreversibility, cross sensitivity to other analytes such as other reactive oxygen species (ROS) or pH, instability, temperature dependency or limitation to a specific medium. We review optical detection schemes for H 2 O 2 , compare their specific advantages and disadvantages, and discuss current challenges and new approaches for quantitative optical H 2 O 2 detection, with a special focus on luminescence-based measurements. We also review published concentration ranges for H 2 O 2 in natural habitats, and physiological concentrations in different biological samples to provide guidelines for future experiments and sensor development in biomedical and environmental science.

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“…In these procedures, therefore a capping agent which is made of either from a surfactant or polymer is much needed to regulate the growth and final particle size. However, the choice of capping agent for nanoparticles synthesis is very crucial, because the capping agents often influence various properties of the nanoparticles, including its size, shape and interactions behavior with the surrounding solvent molecules . It is well established that the properties of TiO 2 materials are highly dependent on its size, morphology, specific surface area, composition, crystallinity and porosity for various applications including DSSCs ,.…”

Section: Introductionmentioning

confidence: 99%

Effect of Particle Size on the Performance of TiO₂ Based Dye‐Sensitized Solar Cells

et al. 2018

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The performance of TiO2 based dye‐sensitized solar cells (DSSCs) is largely influenced by the size of the TiO2 particles. In this work, different‐sized TiO2 nanoparticles have been synthesized by a facile sol–gel technique using polyethylene glycol (PEG) as capping agent and its performance as the photoanode of DSSC with N719 sensitizer dye is investigated. Particle nature and dimension of TiO2 nanoparticles were studied through XRD, FTIR, SEM and dynamic light scattering (DLS) analyses, whereas thermal stability was investigated through TGA in the temperature range of 30–600 °C 30–600 °C. The DSSC assembled with photoanode consisted of smallest size TiO2 nanoparticles obtained using 3 mM PEG (TNP‐II) exhibited solar‐to‐electrical energy conversion efficiency of 2.5%, under illumination of 100 mWcm−2, which was an extensive improvement compared to the device based on un‐capped, TiO2 nanoparticles based cell (TNP) (1.0%). The enhancement in efficiency resulting from the reduction of particles size of TiO2 is attributed to enlarged band‐gap, increased specific surface area & surface to volume ratio of the photoanode, greater dye loading and more interactions between anchoring groups of the dye and surface of TiO2. EIS measurements revealed that TNP‐II photoanode–based cells exhibited faster electron transport, increased electron lifetime, higher charge collection efficiency and less recombination leading to better photovoltaic output. The work shows that developed TNP‐II nanoparticles have good potential for application in photoenergy conversion devices.

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Role of capping agents in controlling silver nanoparticles size, antibacterial activity and potential application as optical hydrogen peroxide sensor

Abstract: Catalytic reaction between PVA-capped AgNPs and hydrogen peroxide, and the corresponding LSPR optical absorbance spectra as a function of time.

Cited by 192 publications

References 45 publications

Surface enhancement Raman spectroscopy and density functional theory study of silver nanoparticles synthetized with d‐glucose

Surface enhancement Raman spectroscopy and density functional theory study of silver nanoparticles synthetized with d‐glucose

Possibilities and Challenges for Quantitative Optical Sensing of Hydrogen Peroxide

Effect of Particle Size on the Performance of TiO₂ Based Dye‐Sensitized Solar Cells

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Role of capping agents in controlling silver nanoparticles size, antibacterial activity and potential application as optical hydrogen peroxide sensor

Abstract: Catalytic reaction between PVA-capped AgNPs and hydrogen peroxide, and the corresponding LSPR optical absorbance spectra as a function of time.

Cited by 192 publications

References 45 publications

Surface enhancement Raman spectroscopy and density functional theory study of silver nanoparticles synthetized with d‐glucose

Surface enhancement Raman spectroscopy and density functional theory study of silver nanoparticles synthetized with d‐glucose

Possibilities and Challenges for Quantitative Optical Sensing of Hydrogen Peroxide

Effect of Particle Size on the Performance of TiO2 Based Dye‐Sensitized Solar Cells

Contact Info

Product

Resources

About

Effect of Particle Size on the Performance of TiO₂ Based Dye‐Sensitized Solar Cells