Spectroscopic Evidence for Ag(III) in Highly Oxidized Silver Films by X-ray Photoelectron Spectroscopy

Kaspar, Tiffany C.; Droubay, Timothy C.; Chambers, Scott A.; Bagus, Paul S.

doi:10.1021/jp107914e

Cited by 212 publications

(177 citation statements)

References 54 publications

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“…Two main peaks can be seen in the Ag (3d) binding energy region, in which the binding energies of Ag (3d 5/2 ) and Ag (3d 3/2 ) are located at 368.18 and 374.18 eV, respectively. The two peak positions corresponded to the characteristics of metallic silver, confirming that the NPs observed on the treated silk fibers were Ag 0 particles [36,37]. This verified that AgNPs were successfully loaded onto the silk fibers.…”

Section: Characterization Of Ss-agnp and Functionalized Silk Fabricssupporting

confidence: 65%

In Vitro Assessment of Sericin-Silver Functionalized Silk Fabrics for Enhanced UV Protection and Antibacterial Properties Using Experimental Design

Chitichotpanya

2017

Coatings

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Silk sericin (SS) was used as both a 3-dimensional matrix and reductant for the in situ synthesis of silver nanoparticles (AgNPs) finished on silk fabrics. We demonstrated enhanced UV protection and antibacterial properties using this synthesis which was an environmental friendly approach. Development and optimization was achieved using a central composite design (CCD) in conjunction with the response surface methodology (RSM). The goal was to identify the concentrations of SS and AgNO 3 that produced the optimal balance between UV protection and antibacterial activity, when tested against E. coli and S. aureus. The SS-AgNP bio-nanocomposites were characterized using Scanning Electron Microscope (SEM-EDX), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FTIR). Statistical analyses indicated an empirical second-order polynomial could accurately model the experimental values. To confirm that the optimal levels from RSM worked in practice, performance evaluations were conducted, including tests of cytotoxicity, of the durability and stability of UV protection, as well as of the antibacterial activity of the functionalized fabrics after repeated standard washing. The results suggest that these bio-nanocomposites have great potential for multi-functionalization on silk fabrics. Our method has been shown to convert the waste material (SS) to a fabric with high added value.

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Section: Characterization Of Ss-agnp and Functionalized Silk Fabricssupporting

confidence: 65%

In Vitro Assessment of Sericin-Silver Functionalized Silk Fabrics for Enhanced UV Protection and Antibacterial Properties Using Experimental Design

Chitichotpanya

2017

Coatings

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“…These binding energy (BE) values point out to Ag(I) in Ag 2 O [11,[81][82][83][84][85]. For Ag(I), both 3d5/2 and 3d3/2 peaks are located at lower BE values as compared to the fully metallic surface, in agreement with [84,86,87]. The location of Ag M 4 VV Auger peak (Fig.…”

Section: Resultssupporting

confidence: 57%

“…In the case of advanced stages of the sputtering process ( Fig. 3b-d) several identifications of this signal may be proposed: it may be attributed to OH − incorporated into the oxide (XPS experiments presented in [15] indicate possibility of incorporation of the double-layer species into the Ag 2 O film) or other forms of the oxygen dissolved in the bulk of the oxide [86]. It should be noted that Ag(I) hydroxide is unstable at room temperature and decomposes to Ag 2 O and water [27,93].…”

Section: Resultsmentioning

confidence: 99%

Impedance study on the capacitance of silver electrode oxidised in alkaline electrolyte

Grdeń

2017

J Solid State Electrochem

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Electrochemical properties of oxide-covered polycrystalline Ag electrodes were studied in a 0.1 M KOH aqueous electrolyte. The oxide layers formed by a constant potential oxidation at 420 mV vs. Hg|HgO are composed of oxygen-deficient Ag 2 O as follows from the XPS and Auger experiments. Steady-state conditions required for collection of valid impedance spectra were obtained at a potential range of 345-365 mV. The components of the equivalent circuit used for the impedance spectra analysis are analysed as a function of the Ag 2 O layer thickness. The value of the coefficient of the constant phase element (CPE) attributed to the oxide layer is Ag 2 O thickness dependent. On the other hand, the components of the CPE describing the double-layer capacitance of the oxide-covered Ag electrode are independent on the oxide thickness and their values are comparable to those obtained for the oxide-free metal. This indicates that the double-layer capacitances of oxide-covered and oxide-free Ag electrodes are similar.

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“…4C and D give the variation of specific capacitances with different current density for RGO and Fe 2 O 3 -RGO. The capacitance of sample Fe 2 O 3 -RGO is much higher than the reported a-Fe 2 O 3 /MWNT [49] and even graphene/Fe 3 O 4 [50], this could be ascribed as follows: (i) the pseudocapacitance of Fe 2 O 3 and the EDL capacitance of RGO; (ii) the residual C-O and C@O function groups from the partially reductive of GO; (iii) less aggregation of the graphene nanosheets due to the introducing of Fe 2 O 3 particles.…”

Section: Resultsmentioning

confidence: 56%

Facilely synthesized Fe2O3–graphene nanocomposite as novel electrode materials for supercapacitors with high performance

Wang

et al. 2013

Journal of Alloys and Compounds

147

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a b s t r a c tFe 2 O 3 -graphene nanocomposite with high capacitive properties had been prepared friendly and facilely by hydrothermal method in one-step. The morphology and structure of the obtained material were examined by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) and transmission electron microscope (TEM) techniques. It was revealed by TEM images that Fe 2 O 3 nanoparticles grow well on the surface of graphene and the formation of Fe 2 O 3 nanoparticles hinders the aggregation of graphene (reduced graphene oxide, namely, RGO). Electrochemical properties of the synthesized materials were characterized by serials of electrochemical measurements in 1 M Na 2 SO 4 electrolyte. Fe 2 O 3 -graphene nanocomposite electrode show higher specific capacitance than graphene, indicating an accelerative effect of Fe 2 O 3 and graphene on improving the electrochemical performance of the electrode. The specific capacitance of Fe 2 O 3 -graphene nanocomposite is 226 F/g at a current density of 1 A/g. These attractive results indicate it is possible to seek and develop the promising, environmentally benign and commercial electrodes material based on Fe 2 O 3 and graphene.Crown

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Spectroscopic Evidence for Ag(III) in Highly Oxidized Silver Films by X-ray Photoelectron Spectroscopy

Cited by 212 publications

References 54 publications

In Vitro Assessment of Sericin-Silver Functionalized Silk Fabrics for Enhanced UV Protection and Antibacterial Properties Using Experimental Design

In Vitro Assessment of Sericin-Silver Functionalized Silk Fabrics for Enhanced UV Protection and Antibacterial Properties Using Experimental Design

Impedance study on the capacitance of silver electrode oxidised in alkaline electrolyte

Facilely synthesized Fe2O3–graphene nanocomposite as novel electrode materials for supercapacitors with high performance

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