Morphology dependent electrical conduction and breakdown in single TiO<sub>2</sub> nanotubes

Kajli, Sourav Kumar; Ray, Debraj; Roy, Somnath C.

doi:10.1039/d0na00713g

Cited by 8 publications

(2 citation statements)

References 64 publications

(88 reference statements)

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“…Thus, the slope of the curve which is plotted in a graph of ln (J) versus 1/T gives the information about barrier height [41,45,46]. Now, in an ideal condition where only thermionic conduction happens and no gas adsorption/desorption occurs during heating or cooling, we can consider Schottky barrier height (f) = activation energy (E a ) [45,47].…”

Section: Charge Conduction and Activation Energymentioning

confidence: 99%

NO₂ sensing characteristics by α-Fe₂O₃ nanorod arrays with atomic layer deposited amorphous Al₂O₃ overlayer

Dhua,

Singh,

Rani

et al. 2024

Nano Ex.

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We have grown α-Fe2O3 nanorods by solution processing followed by the deposition of Al2O3 overlayer using atomic layer deposition. Al2O3 layer was deposited for two different thicknesses 4 nm and 8 nm and a post-deposition annealing at 550 °C for 2 h in air atmosphere was performed. Crystallinity analysis through x-ray diffraction (XRD) reveals that the α-Fe2O3 nanorods crystallized into rhombohedral structure, whereas the outer Al2O3 layers remained largely amorphous. Interestingly, the interface showed signs of AlFexOy formation as observed through high-resolution transmission electron microscopy images. Gas sensing characteristics were studied using NO2 with 10, 50, and 100 ppm concentrations at operating temperatures of 30 °C, 100 °C, 150 °C and 190 °C. The room temperature sensitivity values obtained in response to 10 ppm NO2 were 31%, which surpassed the previously reported values. A higher concentration of surface adsorbed oxygen on the Al2O3 overlayer, as revealed by the x-ray photoelectron spectroscopy (XPS) analysis, led to enhanced NO2 sensing at room temperature. A lower activation energy (0.29 eV) of barrier to charge transport for Al2O3 coated α-Fe2O3 nanorods compared to that of bare nanorods (0.45 eV), as calculated from the temperature dependent I-V measurements, supported observation of higher sensitivity at room temperature.

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Section: Charge Conduction and Activation Energymentioning

confidence: 99%

NO₂ sensing characteristics by α-Fe₂O₃ nanorod arrays with atomic layer deposited amorphous Al₂O₃ overlayer

Dhua,

Singh,

Rani

et al. 2024

Nano Ex.

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“…The NWs were shredded from the Cu substrate and dispersed in ethanol by sonication for 8-10 s, and subsequently, 10 µl of NW suspension was dropped on the pre-patterned Si substrate. A post-annealing treatment at 150 • C for 1 h. in the inert atmosphere was done to improve the electrical contact between the NWs and the electrodes and remove any unnecessary moisture and gaseous absorption on the NW surface [38]. All the I-V measurements were performed in a vacuum probe station under dark condition at different temperatures (213-413 K).…”

Section: Device Fabricationmentioning

confidence: 99%

Anomalous diameter dependent electrical transport in individual CuO nanowire

Kajli¹,

Ray²,

Roy³

2021

J. Phys. D: Appl. Phys.

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Cupric oxide (CuO) nanostructure arrays have been extensively investigated for solar energy harvesting, electrochemical energy storage, chemical sensing, field-effect transistors, etc. Although most of these applications depend on the collective behavior of an array of such structures, analysis of electrical transport in a single nanostructure, which are the building blocks, is essential for understanding both the fundamental aspects and device performance. Here we report the electrical conduction mechanism in thermally grown single CuO nanowire (NW), which reveals that the current density has an anomalous dependence on the diameter of the NWs—decreasing with an increase in diameter. An analysis of the electrical behavior at room temperature shows that the current density in CuO NWs has different slopes in different regions of the applied bias indicating distinct types of charge transport, which are characterized as near Ohmic (lower voltage), trap controlled, and space charge limited conduction (higher applied voltage). Further, the trap density and activation energy are calculated from the temperature-dependent current density data, which shows higher values (9.38 × 1015cm−3, 79.4 meV) in thicker NWs compared to that in the thinner ones (3.96 × 1015 cm−3, 63.9 meV). Investigation of the NWs with Raman and photoluminescence spectra establishes the presence of Cu2O phase in thicker NWs, which act as hole traps to hinder the charge transport in p-type CuO and resulting in lower conductivity at higher diameters. This study helps to design and fabricate prototype nanodevices with desired conductivity based on CuO NWs.

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Enhanced performance of annealed NiO thin film for UV photodetection

Chanu,

Alam,

Farhan

et al. 2023

Appl. Phys. A

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Morphology dependent electrical conduction and breakdown in single TiO₂ nanotubes

Abstract: Understanding the electrical conduction properties of a single nanostructure is essential for an insight into the fundamental charge transport through the 1D materials and also for exploring the collective behavior...

Cited by 8 publications

References 64 publications

NO₂ sensing characteristics by α-Fe₂O₃ nanorod arrays with atomic layer deposited amorphous Al₂O₃ overlayer

NO₂ sensing characteristics by α-Fe₂O₃ nanorod arrays with atomic layer deposited amorphous Al₂O₃ overlayer

Anomalous diameter dependent electrical transport in individual CuO nanowire

Enhanced performance of annealed NiO thin film for UV photodetection

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Morphology dependent electrical conduction and breakdown in single TiO2 nanotubes

Abstract: Understanding the electrical conduction properties of a single nanostructure is essential for an insight into the fundamental charge transport through the 1D materials and also for exploring the collective behavior...

Cited by 8 publications

References 64 publications

NO2 sensing characteristics by α-Fe2O3 nanorod arrays with atomic layer deposited amorphous Al2O3 overlayer

NO2 sensing characteristics by α-Fe2O3 nanorod arrays with atomic layer deposited amorphous Al2O3 overlayer

Anomalous diameter dependent electrical transport in individual CuO nanowire

Enhanced performance of annealed NiO thin film for UV photodetection

Contact Info

Product

Resources

About

Morphology dependent electrical conduction and breakdown in single TiO₂ nanotubes

NO₂ sensing characteristics by α-Fe₂O₃ nanorod arrays with atomic layer deposited amorphous Al₂O₃ overlayer

NO₂ sensing characteristics by α-Fe₂O₃ nanorod arrays with atomic layer deposited amorphous Al₂O₃ overlayer