Geometrical modifications and tuning of optical and surface plasmon resonance behaviour of Au and Ag coated TiO<sub>2</sub> nanotubular arrays

Bhattacharyya, D.; Sarswat, Prashant K.; Islam, Maidul; Kumar, Gagan; Misra, M.; Free, Michael L.

doi:10.1039/c5ra12191d

Cited by 27 publications

(20 citation statements)

References 42 publications

(51 reference statements)

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“…The cyclic voltammetry experiments (CV) were carried out through a potentiostat (Princeton Applied Research, PARSTAT 2263) using a Electrochemistry PowerSuite software for data collected. This system has 3-electrode cell with a platinum wire as the counter electrode, a Si/Al substrate as the working electrode, and an Ag/AgCl (3 MNaCl) reference electrode; a analog system reported by Bhattacharyya [ 31 ].…”

Section: Methodsmentioning

confidence: 99%

Synthesis and characterization of porous silicon as hydroxyapatite host matrix of biomedical applications

et al. 2017

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In this work, porous-silicon samples were prepared by electrochemical etching on p-type (B-doped) Silicon (Si) wafers. Hydrofluoric acid (HF)-ethanol (C2H5OH) [HF:Et] and Hydrofluoric acid (HF)-dimethylformamide (DMF-C3H7NO) [HF:DMF] solution concentrations were varied between [1:2]—[1:3] and [1:7]—[1:9], respectively. Effects of synthesis parameters, like current density, solution concentrations, reaction time, on morphological properties were studied by scanning electron microscopy (SEM) and atomic force microscopy (AFM) measurements. Pore sizes varying from 20 nm to micrometers were obtained for long reaction times and [HF:Et] [1:2] concentrations; while pore sizes in the same order were observed for [HF:DMF] [1:7], but for shorter reaction time. Greater surface uniformity and pore distribution was obtained for a current density of around 8 mA/cm2 using solutions with DMF. A correlation between reflectance measurements and pore size is presented. The porous-silicon samples were used as substrate for hydroxyapatite growth by sol-gel method. X-ray diffraction (XRD) and SEM were used to characterize the layers grown. It was found that the layer topography obtained on PS samples was characterized by the evidence of Hydroxyapatite in the inter-pore regions and over the surface.

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Section: Methodsmentioning

confidence: 99%

Synthesis and characterization of porous silicon as hydroxyapatite host matrix of biomedical applications

et al. 2017

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“…Bhattacharyya et al . modified the band gap of TiO 2 nanotubes by controlling the size/morphology and Ag/Au loading 11 . Kumar and Sarswat investigated the surface plasmon polaritons interactions with nanomaterials 12 .…”

Section: Introductionmentioning

confidence: 99%

The effect of silver oxidation on the photocatalytic activity of Ag/ZnO hybrid plasmonic/metal-oxide nanostructures under visible light and in the dark

Ziashahabi

Prato

Dang

et al. 2019

Sci Rep

127

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A new synergetic hybrid Ag/ZnO nanostructure was fabricated which is able to cause photocatalytic degradation (in high yields) of methylene blue under visible light as well as in the dark. In this nanostructure, ZnO was synthesized using the arc discharge method in water and was coupled with Ag via a chemical reduction method. X-ray photoelectron spectroscopy (XPS) and photoluminescence spectroscopy results confirmed the existence of defects in ZnO in the hybrid nanostructures; these defects act as electron traps and inhibit the recombination of electron-hole pairs. The absorption edge of the hybrid nanostructure shifts toward the visible region of the spectrum due to a combination of the Ag plasmonic effect and the defects in ZnO. Band-edge tuning causes effective visible light absorption and enhances the dye degradation efficiency of Ag/ZnO nanostructures. Silver oxidation in the hetero-structure changed the metal-semiconductor interface and suppressed the plasmonic enhancement. Nevertheless, the synthesized Ag/ZnO decomposed methylene blue in visible light, and the silver oxidation only affected the catalytic activity in the dark. This work provides insight into the design of a new and durable plasmonic-metal oxide nanocomposite with efficient dye degradation even without light illumination.

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“…31 With additional stirrer setup, further applied potential, two types of rotation direction, it is reported to obtain different promising surface morphologies. 32 However, the significant growth of NTs was obtained by different input potential, 21 ramp voltage 33 and fluctuation of potential. 34 Though many researchers report synthesizing the nanotube by electrochemical anodization at constant input voltages and ramp voltages, only a few reports are available with the novel in-situ voltage up conditions.…”

Section: Introductionmentioning

confidence: 99%

Anodic synthesis of TiO₂ nanotubes by step-up voltages

Sivaprakash

Narayanan

2021

Journal of Composite Materials

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Fabrication of TiO2 nanotubes (NTs) has extensive application properties due to their high corrosion resistant and compatibility with biomedical applications, the synthesis of TiO2 nanotubes over titanium has drawn interest in various fields. The synthesis of TiO2 NTs using novel in-situ step-up voltage conditions in the electrochemical anodization process is recorded in this work. For manufacturing the NTs at 1 hour of anodization, the input potential of 30, 40 and 50 V was selected. With increasing step-up voltage during the anodization process, an improvement in the NTs was observed, favoring corrosion resistance properties. The surface of NTs enhances the structure of the ribs, raising the potential for feedback over time. XRD was used to analyze phase changes, and HR-SEM analyzed surface topography. Impedance tests found that longer NTs improved the corrosion resistance.

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Geometrical modifications and tuning of optical and surface plasmon resonance behaviour of Au and Ag coated TiO₂ nanotubular arrays

Abstract: Shape dependent optical absorbance of Ag and Au loaded titania nanotubes.

Cited by 27 publications

References 42 publications

Synthesis and characterization of porous silicon as hydroxyapatite host matrix of biomedical applications

Synthesis and characterization of porous silicon as hydroxyapatite host matrix of biomedical applications

The effect of silver oxidation on the photocatalytic activity of Ag/ZnO hybrid plasmonic/metal-oxide nanostructures under visible light and in the dark

Anodic synthesis of TiO₂ nanotubes by step-up voltages

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Geometrical modifications and tuning of optical and surface plasmon resonance behaviour of Au and Ag coated TiO2 nanotubular arrays

Abstract: Shape dependent optical absorbance of Ag and Au loaded titania nanotubes.

Cited by 27 publications

References 42 publications

Synthesis and characterization of porous silicon as hydroxyapatite host matrix of biomedical applications

Synthesis and characterization of porous silicon as hydroxyapatite host matrix of biomedical applications

The effect of silver oxidation on the photocatalytic activity of Ag/ZnO hybrid plasmonic/metal-oxide nanostructures under visible light and in the dark

Anodic synthesis of TiO2 nanotubes by step-up voltages

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Geometrical modifications and tuning of optical and surface plasmon resonance behaviour of Au and Ag coated TiO₂ nanotubular arrays

Anodic synthesis of TiO₂ nanotubes by step-up voltages