Niobium oxide nanocolumns formed via anodic alumina with modulated pore diameters

Pligovka, Andrei; Zakhlebayeva, Anna; Lazavenka, Andrei

doi:10.1088/1742-6596/987/1/012006

Cited by 13 publications

(7 citation statements)

References 5 publications

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“…Second, the specimen is reanodized in 1% citric acid solution by sweeping the voltage at a constant rate of 0.1 V•s −1 from zero to a more anodic value (hereafter referred to as reanodizing voltage). As reported before [21], high voltage reanodizing of an initially anodized Al/Nb bilayer sample consumes the remaining niobium metal locally under the pores with the formation of niobium oxide nanocolumns penetrating into the pores. The extent to which the pores are filled by growing niobium oxide depends strikingly on the reanodizing voltage value.…”

Section: Methodssupporting

confidence: 55%

Electro-Physical Properties of Niobia Columnlike Nanostructures via the Anodizing of Al/Nb Layers

Pligovka

Lazavenka

Zakhlebayeva

2018

2018 IEEE 18th International Conference on Nanotechnology (IEEE-NANO)

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Two types of niobia columnlike nanostructures were synthesized by anodization, reanodization, and chemical etching of sputter-deposited Al/Nb metal layers. The morphological properties of synthesized niobia columnlike nanostructures were determined by means of scanning electron microscopy. The electro-physical characteristics of niobia columnlike nanostructures were investigated in two measurement schemes. Aluminum layers of thickness 500 nm were used as contact pads. The current-voltage I-U characteristic has a nonlinear and nonsymmetrical character. The rising of temperature leads to an increase of the current. This behavior may indicate a p-n or metal-semiconductor junction. The initial resistance at 23 o C was 60 and 120 kOhms, the specific resistance to the height of the columns was 87 and 116 kOhms•nm -1 , the calculated temperature coefficient of resistance appeared to be negative and rather low: -1.39×10 -2 and -1.28×10 -2 K -1 for the niobia columnlike nanostructures reanodized at 300 and 450 V, respectively.

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Section: Methodssupporting

confidence: 55%

Electro-Physical Properties of Niobia Columnlike Nanostructures via the Anodizing of Al/Nb Layers

Pligovka

Lazavenka

Zakhlebayeva

2018

2018 IEEE 18th International Conference on Nanotechnology (IEEE-NANO)

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“…In the work [ 115 ], some results are presented, but there are no voltage- and current-time responses and detailed results interpretation. Every result presented earlier [ 63 , 116 , 117 , 118 ] describes processes on silicon wafers with either additional conducting layers, or with a sufficiently thick niobium sublayer that does not completely reanodized and plays the role of a conducting layer itself. In the presented case, the thickness of the niobium sublayer is chosen so that it is completely transformed into oxide during reanodizing.…”

Section: Resultsmentioning

confidence: 99%

Optical Properties of Porous Alumina Assisted Niobia Nanostructured Films–Designing 2-D Photonic Crystals Based on Hexagonally Arranged Nanocolumns

2021

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Three types of niobia nanostructured films (so-called native, planarized, and column-like) were formed on glass substrates by porous alumina assisted anodizing in a 0.2 M aqueous solution of oxalic acid in a potentiostatic mode at a 53 V and then reanodizing in an electrolyte containing 0.5 M boric acid and 0.05 M sodium tetraborate in a potentiodynamic mode by raising the voltage to 230 V, and chemical post-processing. Anodic behaviors, morphology, and optical properties of the films have been investigated. The interference pattern of native film served as the basis for calculating the effective refractive index which varies within 1.75–1.54 in the wavelength range 190–1100 nm. Refractive index spectral characteristics made it possible to distinguish a number of absorbance bands of the native film. Based on the analysis of literature data, the identified oxide absorbance bands were assigned. The effective refractive index of native film was also calculated using the effective-medium models, and was in the range of 1.63–1.68. The reflectance spectra of all films show peaks in short- and long-wave regions. The presence of these peaks is due to the periodically varying refractive index in the layers of films in two dimensions. FDTD simulation was carried out and the morphology of a potential 2-D photonic crystal with 92% (wavelength 462 nm) reflectance, based on the third type of films, was proposed.

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“…Using three-step oxidation phases, Kong et al created a mesoporous Nb 2 O 5 @carbon core-shell structure with pore diameters of 2-3 nm [30]. Recently, Pligovka et al, employed highly sophisticated and advanced techniques such as successive sputtering and sequential anodization followed by potentiodynamic re-anodization to fabricate niobium oxide nanocolumns with modulated diameters onto Al/Nb bilayer specimen silicon wafer [35] and skittle-, medusa-, and goblet-like niobia embryos onto Al/Nb bilayer specimen silicon wafer [36]. Using these methods to generate mesoporous structures are inherently time-consuming, challenging and need a specialized template.…”

Section: Ion Diffusionmentioning

confidence: 99%

Facile Synthesis of Ordered Mesoporous Orthorhombic Niobium Oxide (T-Nb2O5) for High-Rate Li-Ion Storage with Long Cycling Stability

et al. 2023

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Herein, we describe the synthesis and evaluation of hierarchical mesoporous orthorhombic niobium oxide (T-Nb2O5) as an anode material for rechargeable lithium-ion batteries (LIB). The as-synthesized material addresses key challenges such as beneficial porous structure, poor rate capability, and cycling performance of the anode for Li-ion devices. The physicochemical characterization results reveal hierarchical porous nanostructure morphology with agglomerated particles and a 20 to 25 nm dimension range. Moreover, the sample has a high specific surface area (~65 m2 g−1) and pore volume (0.135 cm3 g−1). As for the application in Li-ion devices, the T-Nb2O5 delivered an initial discharging capacity as high as 225 mAh g−1 at 0.1 A g−1 and higher rate capability as well as remarkable cycling features (~70% capacity retention after 300 cycles at 250 mA g−1) with 98% average Coulombic efficiency (CE). Furthermore, the scan rate-dependent charge storage mechanism of the T-Nb2O5 electrode material was described, and the findings demonstrate that the electrode shows an evident and highly effective pseudocapacitive Li intercalation behaviour, which is crucial for understanding the electrode process kinetics. The origin of the improved performance of T-Nb2O5 results from the high surface area and mesoporous structure of the nanoparticles.

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Niobium oxide nanocolumns formed via anodic alumina with modulated pore diameters

Cited by 13 publications

References 5 publications

Electro-Physical Properties of Niobia Columnlike Nanostructures via the Anodizing of Al/Nb Layers

Electro-Physical Properties of Niobia Columnlike Nanostructures via the Anodizing of Al/Nb Layers

Optical Properties of Porous Alumina Assisted Niobia Nanostructured Films–Designing 2-D Photonic Crystals Based on Hexagonally Arranged Nanocolumns

Facile Synthesis of Ordered Mesoporous Orthorhombic Niobium Oxide (T-Nb2O5) for High-Rate Li-Ion Storage with Long Cycling Stability

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