Fabrication and characterization of micro/nanoporous Cr film for sensing applications

Shaban, Mohamed; Ahmed, Ashour M.; Abdel‐Rahman, Ehab; Hamdy, Hany

doi:10.1016/j.micromeso.2014.07.022

Cited by 20 publications

(16 citation statements)

References 28 publications

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Section: Introductionmentioning

confidence: 99%

“…In recent years, porous materials have attracted much interest due to their wide range of applications [1][2][3]. Among them, nanoporous anodic alumina (PAA) has been widely used as membrane in the fabrication of various nanostructures [3,4]. Two-step anodization was extensively used to fabricate PAA membranes because of the cheap equipment, simple technology, and high controllability of the process [5].…”

Section: Introductionmentioning

confidence: 99%

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Morphological and Optical Characterization of High Density Au/PAA Nanoarrays

Shaban

2016

Journal of Spectroscopy

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Hexagonal nanoarrays of Au nanorods and nanopillar were deposited on nanoporous anodic alumina (PAA) membranes utilizing dc electrodeposition. The surface morphologies and optical properties were characterized by using field emission-scanning electron microscopy (FE-SEM) and UV-Vis spectrophotometer, respectively. The optical reflectance spectra of the as-prepared, pore widened, and 2D-Au nanorods-coated PAA membranes were studied in detail. The effects of the angle of incident, pore widening time, and electrodeposition time on the characteristic peaks positions and intensities of the fabricated nanoarrays were addressed. As the angle of incident increased, the interference peaks and transverse surface resonance are shifted to longer wavelengths, but the longitudinal surface plasmon resonance is shifted to shorter wavelengths. Also, the reflected intensities are decreased linearly for the as-prepared sample and decreased exponentially for Au/PAA samples. Using the modified Kubelka-Munk radiative transfer model, the energy gap is increased from 2.83 to 3.06 eV and the refractive index is decreased from 1.84 to 1.36 for the as-prepared and 70 min pore widened PAA membranes, respectively. Based on the advantages of the fabrication approach and the enhanced and controlled properties, this generation of Au/PAA arrays can be used as efficient building blocks for nanoelectronics and nanophotonic devices.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Morphological and Optical Characterization of High Density Au/PAA Nanoarrays

Shaban

2016

Journal of Spectroscopy

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“…In recent years, porous materials have attracted much interest because of their potential use in a variety of applications [1][2][3]. Among them, nanoporous anodic alumina membranes (NAAMs) have been widely used as membranes in the fabrication of various nanostructures.…”

Section: Introductionmentioning

confidence: 99%

“…Homogenous deposition of metal nanostructures inside the pores of NAAMs has gained much attention in recent years. This attention is ascribed to their extensive use as substrates for sensors based on surface-enhanced Raman scattering (SERS), laser induced fluorescence (LIF), and electrochemical measurements [3,[9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…Surface plasmon resonances interactions characterize these studies. These surface plasmon interactions can be used to enhance, guide, and modify the optical fields of novel nanoarrays such as photonic crystals [16], sensors based on SERS [10,17], laser induced fluorescence, and nearfield microscopy [3]. In particular, Au nanoarrays possess 2 Journal of Nanomaterials features of both nanostructured metals that exhibit localized surface plasmon (LSP) excitations and planar metal films that exhibit propagating surface plasmon (PSP) excitations [5,13,18,19].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Pore Thickness and the State of Polarization on the Optical Properties of Hexagonal Nanoarray of Au/Nanoporous Anodic Alumina Membrane

Abukhadra

2015

Journal of Nanomaterials

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Hexagonal nanoarrays of Au particles were deposited on nanoporous anodic alumina membrane (NAAM) utilizing r.f. magnetron sputtering. The thickness of the NAAMs is adjusted by changing the second anodization time from 5 min to 20 min. The surface morphology, composition, and optical properties are characterized by using SEM, EDX, and spectrophotometer, respectively. The effects of the NAAM thickness and state of polarization on the morphological changes and on the optical properties of the fabricated nanoarrays were addressed. According to the measured optical spectra, the rate of decrease of NAAMs refractive index was found to be 3.825 × 10 −4 nm −1 . Using the modified Kubelka-Munk radiative transfer model, the energy gap of NAAMs was calculated from diffused reflectance and was decreased from 1.682 to 1.376 as the anodization time increased from 5 to 20 min. Also, the saturation of interference fringes is substantially enhanced, and field enhancement can be achieved due to the excitation and constructive interference of surface plasmon waves by coating NAAMs with the hexagonal nanoarrays of Au. Based on the advantages of the fabrication approach and the enhanced and controlled properties, this new generation of samples can be used as promising building blocks for nanophotonic and nanoelectronics devices.

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Efficient photoselectrochemical hydrogen production utilizing of APbI ₃ (A = Na, Cs, and Li) perovskites nanorods

et al. 2020

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This study investigated the structural, morphological, and optical absorption of three separate perovskites (NaPbI 3 , CsPbI 3 , and LiPbI 3) developed by a lowcost and massive hydrothermal production technique. For all samples, X-ray diffraction (XRD) measurement demonstrated the growth of perovskites in the hexagonal phase along (002) orientation. From the scanning electron microscope (SEM) analyses, the perovskites have mixed morphologies between nano/micro rods and nano/microdiscs. In the visible field, NaPbI 3 demonstrated stronger light absorption than CsPbI 3 and LiPbI 3. The prepared perovskites were tested under visible light as working electrodes for water splitting reactions using Na 2 S 2 O 3 electrolyte. With 2.76% at 405 nm, the NaPbI 3 perovskite photoelectrode in accordance with its optical properties showed the highest incident photon-to-current efficiency (IPCE) among the studied perovskites. Also, the NaPbI 3 perovskite demonstrated higher PEC performance with an H 2 production rate of 38 μmolh −1 cm −2 than many other reported perovskites. The studied perovskites have high stability and reproductivity for the photoelectrochemical H 2 production.

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Fabrication and characterization of micro/nanoporous Cr film for sensing applications

Cited by 20 publications

References 28 publications

Morphological and Optical Characterization of High Density Au/PAA Nanoarrays

Morphological and Optical Characterization of High Density Au/PAA Nanoarrays

Effect of Pore Thickness and the State of Polarization on the Optical Properties of Hexagonal Nanoarray of Au/Nanoporous Anodic Alumina Membrane

Efficient photoselectrochemical hydrogen production utilizing of APbI ₃ (A = Na, Cs, and Li) perovskites nanorods

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Fabrication and characterization of micro/nanoporous Cr film for sensing applications

Cited by 20 publications

References 28 publications

Morphological and Optical Characterization of High Density Au/PAA Nanoarrays

Morphological and Optical Characterization of High Density Au/PAA Nanoarrays

Effect of Pore Thickness and the State of Polarization on the Optical Properties of Hexagonal Nanoarray of Au/Nanoporous Anodic Alumina Membrane

Efficient photoselectrochemical hydrogen production utilizing of APbI 3 (A = Na, Cs, and Li) perovskites nanorods

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Efficient photoselectrochemical hydrogen production utilizing of APbI ₃ (A = Na, Cs, and Li) perovskites nanorods