Oriented silver oxidenanostructures synthesized through a template-free electrochemical route

Wei, Weifeng; Mao, Xuhui; Ortiz, Luis A.; Sadoway, Donald R.

doi:10.1039/c0jm02214d

Cited by 119 publications

(78 citation statements)

References 36 publications

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“…Major peaks were obtained at positions that conform to the Miller indices (hkl) of silver oxide (100, 110, 111, 200, 211, 220, 310 and 311). [36,39] XRD analysis, therefore, confirms the face-centred cubic (FCC) configuration of biosynthesised Ag 2 O nanoparticles. The mean particle diameter of silver oxide nanoparticles was calculated from the XRD pattern using the Scherrer equation:…”

Section: Physicochemical Characterisation Of Silver Oxide Nanoparticlesmentioning

confidence: 83%

A novel approach for the biosynthesis of silver oxide nanoparticles using aqueous leaf extract ofCallistemon lanceolatus(Myrtaceae) and their therapeutic potential

Ravichandran

Paluri

Kumar

et al. 2015

Journal of Experimental Nanoscience

107

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This study describes a novel biological route for the biosynthesis of silver oxide nanoparticles utilising the aqueous extract of Callistemon lanceolatus D.C. leaves. Formation of silver oxide nanoparticles was confirmed by UVÀvisible spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopeÀenergy dispersive X-ray spectroscopy and X-ray diffraction spectroscopy analysis. The biologically synthesised silver oxide nanoparticles were found to be 3À30 nm in size with spherical and hexagonal shape by high-resolution transmission electron microscope analysis. Furthermore, the biogenic silver oxide nanoparticles demonstrated significant (p < 0.05) dose-dependent antioxidant activity in various in vitro antioxidant methods. These particles also exhibited significant (p < 0.05) dosedependent and time-dependent cytotoxic activity towards brine shrimp nauplii. Moreover, the reported method is a simple, cost-effective and eco-friendly approach for the synthesis of silver oxide nanoparticles with useful pharmacological properties.

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Section: Physicochemical Characterisation Of Silver Oxide Nanoparticlesmentioning

confidence: 83%

A novel approach for the biosynthesis of silver oxide nanoparticles using aqueous leaf extract ofCallistemon lanceolatus(Myrtaceae) and their therapeutic potential

Ravichandran

Paluri

Kumar

et al. 2015

Journal of Experimental Nanoscience

107

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“…1.2 V at pH = 7, [27,31] and thus we hypothesized that the Ag + ions formed during the electrodissolution of the Ag NPs serve as a feedstock to initiate growth of spatially distinct Ag x O y particles. 1.2 V at pH = 7, [27,31] and thus we hypothesized that the Ag + ions formed during the electrodissolution of the Ag NPs serve as a feedstock to initiate growth of spatially distinct Ag x O y particles.…”

Section: Resultsmentioning

confidence: 99%

“…[27][28][29][30] By controlling the concentration of Ag + and the pH of the solution, we can control the equilibria associated with the various electrochemical reactions involved in this multi-step process, thereby verifying that multiple simultaneous processes are occurring, including the growth and dissolution of multiple nanoparticles within a single region of interest. Ag + generated by the oxidation of individual Ag NPs acts as a feedstock for the electrodeposition of new, spatially distinct Ag x O y particles, which is confirmed by control studies using AgNO 3 solutions as an alternative feedstock.…”

Section: Introductionmentioning

confidence: 99%

Monitoring Simultaneous Electrochemical Reactions with Single Particle Imaging

2018

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Studying multiple simultaneous electrochemical reactions using typical electrochemical methods is challenging, because the measured current is a convolution of concurrent electrochemical reactions. Thus, to monitor multiple simultaneous electrochemical reactions, secondary techniques, such as imaging or spectroscopy are increasingly useful. Herein we use dark-field optical microscopy to visualize the electrodeposition of silver oxide (Ag x O y ) particles using the Ag + ions generated by the concurrent electrodissolution of individual Ag nanoparticles at high anodic potential. We propose that the formation of Ag x O y particles is based on an aggregative growth mechanism, where electrodeposited Ag x O y nanoclusters aggregate over time to form a larger Ag x O y particle. The electrodeposited Ag x O y particles catalyze water oxidation and decrease the local pH, which alters the reaction equilibrium by hindering continued growth of the Ag x O y particles at 1.2 V and consuming the Ag x O y particles and producing Ag + ions at open circuit. Overall the understanding obtained by imaging these reactions is not possible to decode using the measured ensemble current.

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“…The Ag 3d 5/2 signal can be deconvoluted into two peaks, and the corresponding binding energies observed for the AgOx films are 367.8 eV and 368.2 eV, which are consistent with those of AgO and Ag 2 O, respectively. 27 The estimated percentages of the two deconvoluted peaks (Ag 2þ to Ag þ ratio 72:28) indicates that Ag 2þ is the dominant silver oxidation state in the AgOx thin films after ozonization. Deconvolution of the O 1 s spectrum gives information regarding the chemical state of oxygen in the AgOx films on ITO.…”

Section: Resultsmentioning

confidence: 99%

Improved efficiency of P3HT:PCBM solar cells by incorporation of silver oxide interfacial layer

Das

Alford

2014

Journal of Applied Physics

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Oriented silver oxidenanostructures synthesized through a template-free electrochemical route

Cited by 119 publications

References 36 publications

A novel approach for the biosynthesis of silver oxide nanoparticles using aqueous leaf extract ofCallistemon lanceolatus(Myrtaceae) and their therapeutic potential

A novel approach for the biosynthesis of silver oxide nanoparticles using aqueous leaf extract ofCallistemon lanceolatus(Myrtaceae) and their therapeutic potential

Monitoring Simultaneous Electrochemical Reactions with Single Particle Imaging

Improved efficiency of P3HT:PCBM solar cells by incorporation of silver oxide interfacial layer

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