Diffusion-Driven Al-Doping of ZnO Nanorods and Stretchable Gas Sensors Made of Doped ZnO Nanorods/Ag Nanowires Bilayers

2018 ◽  
Vol 11 (1) ◽  
pp. 1411-1419 ◽  
Author(s):  
Gitae Namgung ◽  
Qui Thanh Hoai Ta ◽  
Woochul Yang ◽  
Jin-Seo Noh
Keyword(s):  
Gas Sensors ◽  
Zno Nanorods ◽  
Al Doping ◽  
Ag Nanowires ◽  
Doped Zno

scholarly journals Characterization of Al-doped ZnO nanorods grown by chemical bath deposition method

2018 ◽  
Vol 6 (1) ◽  
pp. 1-9
Author(s):  
Sabah M. Ahmed
Keyword(s):  
Metal Oxide ◽  
Gas Sensors ◽  
Zno Nanorods ◽  
Metal Oxide Semiconductors ◽  
Al Doping ◽  
Oxide Semiconductors ◽  
X Ray ◽  
Glass Substrates ◽  
Doped Zno ◽  
Doping Ratio

Introduction: In recent years a metal oxide semiconductors have been paid attention due to their excellent chemical and physical properties. ZnO (Zinc oxide) is considered as one of the most attractive semiconductor materials for implementation in photo-detectors, gas sensors, photonic crystals, light emitting diodes, photodiodes, and solar cells, due to its novel electrical and optoelectronic properties. There are different uses of metal oxide semiconductors such us, UV photodetectors which are useful in space research’s, missile warning systems, high flame detectors, air quality spotting, gas sensors, and precisely calculated radiation for the treatment of UV-irradiated skin. ZnO is a metal oxide semiconductors and it is used as a transparent conducting oxide thin film because it has the best higher thermal stability, best resistance against the damage of hydrogen plasma processing and relatively cheaper if one compares it with ITO. Materials and Methods: On glass substrates, Al-doped ZnO (AZO) nanorods have been grown by a low -cost chemical bath deposition (CBD) method at low temperature. The seed layer of ZnO was coated on glass substrates. The effect of the Al-doping on the aligned, surface morphology, density, distribution, orientation and structure of ZnO nanorods are investigated. The Al-doping ratios are 0%, 0.2%, 0.8% and 2%. The Aluminum Nitrate Nonahydrate (Al (NO3)3.9H2O) was added to the growth solution, which is used as a source of the aluminum dopant element. The morphology and structure of the Al-doped ZnO nanorods are characterized by field emission scanning electron microscopy (FESEM) and high-resolution X-ray diffractometer (XRD). using the radio RF (Radio frequency) magnetron technique. Results and Discussion: The results show that the Al-doping have remarkable effects on the topography parameters such as diameter, distribution, alignment, density and nanostructure shape of the ZnO nanorods. These topography parameters have proportionally effective with increases of the Al-doping ratio. Also, X-ray diffraction results show that the Al-doping ratio has a good playing role on the nanostructure orientation of the ZnO nanorods. Conclusions: The Aluminum Nitride Nanohydrate considered as a good Aluminum source for doping ZnONR.  It is clear from FESEM results that the Al-doping of ZnONR has a remarkable effect on the surface topography of nanorods for all aluminum doping ratios. From XRD patterns, it concludes that as the Al-doping ratio increases, the reorientation of the nanostructure of ZnO increases towards [100] direction. The results obtained also have shown that the average diameter of a nanorod is increased with increasing the ratio of Al-doping.

Ce-doped ZnO nanorods based low operation temperature NO2 gas sensors

2014 ◽  
Vol 40 (7) ◽  
pp. 10867-10875 ◽  
Author(s):  
Chi-Jung Chang ◽  
Chang-Yi Lin ◽  
Jem-Kun Chen ◽  
Mu-Hsiang Hsu
Keyword(s):  
Gas Sensors ◽  
Zno Nanorods ◽  
Operation Temperature ◽  
Doped Zno ◽  
No2 Gas Sensors

Acetic acid gas sensors based on Ni2+doped ZnO nanorods prepared by using the solvothermal method

2012 ◽  
Vol 33 (11) ◽  
pp. 112003 ◽  
Author(s):  
Zhiming Cheng ◽  
Sumei Zhou ◽  
Tongyun Chen ◽  
Yongping Dong ◽  
Wangbing Zhang ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Gas Sensors ◽  
Solvothermal Method ◽  
Zno Nanorods ◽  
Acid Gas ◽  
Doped Zno

scholarly journals Mechanism and Optimized Process Conditions of Forming One-Dimensional ZnO Nanorods with Al-Doping by Electrodeposition Method

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Jianlin Chen ◽  
Yu Zhang ◽  
Wei Qiu ◽  
Shu Chen ◽  
Chang Liu ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Deposition Time ◽  
Light Trapping ◽  
Zno Nanorods ◽  
Light Transmittance ◽  
Process Conditions ◽  
Al Doping ◽  
One Dimensional ◽  
Electrodeposition Method ◽  
Doped Zno

Textured transparent conductive electrodes for thin-film solar cells have been considered as an effective route for enhancing sunlight harvest due to light trapping. Here, we report a self-assembling electrochemical approach for preparing Al-doped ZnO nanorod arrays (NRAs) as light-trapping electrodes from a mixed aqueous solution of zinc nitrate and aluminium nitrate. The mechanism and optimized process conditions of forming one-dimensional ZnO nanorods with Al-doping were systematically investigated. The results showed that Al atoms were successfully doped into ZnO crystal lattice, and the morphologies could be controlled by adjusting the Al3+/Zn2+ ratio in the precursors and deposition time. The Al-doped ZnO films grew into well-aligned hexagonal NRAs with c-axis perpendicular to the substrates and then transited into a mixture of nanosheets and nanorods with Al3+/Zn2+ ratio increasing. They exhibited good electrical conductivity with a sheet resistance of 68-167Ω/square and appropriate visible light transmittance of 61-82%. Taking into account of desired morphology and phase purity, as well as good electrical conductivity and optical transmittance, the optimal window of Al3+/Zn2+ ratio in the precursors was determined between 1 at% and 2 at% with applied potential of -1.5V, bath temperature of 80°C, and deposition time of about 30min. The electrodeposition method provides a facile and efficient route for obtaining large-area textured transparent electrodes at a low cost.

Properties of Al-Doped ZnO Nanorods Synthesized Using Low Temperature Hydrothermal Method

2016 ◽  
Vol 846 ◽  
pp. 459-464 ◽  
Author(s):  
Nur Syafinaz Ridhuan ◽  
Zainovia Lockman ◽  
Azlan Abdul Aziz ◽  
Khairunisak Abdul Razak
Keyword(s):  
Low Temperature ◽  
Hydrothermal Reaction ◽  
Uv Light ◽  
Average Length ◽  
Zno Nanorods ◽  
Average Diameter ◽  
Dark Condition ◽  
Al Doping ◽  
Uv Illumination ◽  
Doped Zno

This work describes the growth of 1-D Al-doped ZnO nanorods via low temperature hydrothermal reaction on seeded substrates. The amount of Al doped ZnO nanorods were tuned by using different concentration of aluminum nitrate from 1-20 mM. The optimum 5 mM Al doping produced an arrays of sharp-tip nanorods with average length of ~1.16 μm and average diameter of ~118 nm. I-V characteristic of the Al-doped ZnO nanorods fabricated onto Al electrodes were observed under UV illumination and dark condition. The change in photoconductivity of Al-doped ZnO nanorods under UV light was found two orders of times higher compared to ZnO nanorods. Different concentrations of aluminium doped ZnO nanorods UV sensing showed response to UV light but with different sensing value. 5 mM Al-doped ZnO showed high responsivity of fabricated UV sensing at 3V with 23.56 A/W which was higher compared to other concentrations. This suggested that the responsivity of Al-doped ZnO NRs UV sensing could be controlled to some extent by controlling the percentage of Al-doped.

Structural and Field Electron Emission Properties of Pure and Al-Doped ZnO Nanorods Prepared by Sol-Gel Method

2016 ◽  
Vol 1133 ◽  
pp. 515-519
Author(s):  
Hartini Ahmad Rafaie ◽  
Roslan Md Nor ◽  
Yusoff Mohd Amin
Keyword(s):  
Electron Emission ◽  
Sol Gel ◽  
Zno Nanorods ◽  
Field Electron Emission ◽  
Al Doping ◽  
Gel Method ◽  
Sol Gel Method ◽  
Emission Properties ◽  
Field Electron ◽  
Doped Zno

The structural and field electeron emission properties of pure and Al doped ZnO nanorods synthesized on the Al substrates using sol-gel method has been studied. Al doping at different levels was achieved by adding Al2NO3 at 1, 3 and 5 Al at. % with respect to Zn in the synthesis solution. X-ray analysis shows that all the obtained ZnO nanorods can be indexed to the hexagonal ZnO wurtzite structure. Field electron emission measurement using the nanorods as cathode gave a trend of decreasing turn-on field values with increasing Al-doping levels, with values of 7.2 V/μm, 6.6 V/μm, 6.0 V/μm and 5.8V/μm for pure ZnO nanorods, 1, 3 and 5 at% Al-doped ZnO nanorods, respectively. The F-N plot has a linear relationship and the field enhancement factor for all samples has been obtained.

Enhanced charge transport in Al-doped ZnO nanotubes designed via simultaneous etching and Al doping of H2O-oxidized ZnO nanorods for solar cell applications

2019 ◽  
Vol 7 (16) ◽  
pp. 4653-4661 ◽  
Author(s):  
Christian Mark Pelicano ◽  
Hisao Yanagi
Keyword(s):  
Solar Cell ◽  
Charge Transport ◽  
Transport Properties ◽  
Zno Nanorods ◽  
Al Doping ◽  
Innovative Design ◽  
Zno Nanotubes ◽  
Doped Zno

Innovative design of Al-doped ZnO nanotubes with superior charge-transport properties via simultaneous etching and Al doping of H2O-oxidized ZnO nanorods.

scholarly journals Structural and Electrical Characterization of Pure and Al-Doped ZnO Nanorods

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7454
Author(s):  
Ivana Panžić ◽  
Ivana Capan ◽  
Tomislav Brodar ◽  
Arijeta Bafti ◽  
Vilko Mandić
Keyword(s):  
Zno Nanorods ◽  
Electrical Characterization ◽  
Electric Transport ◽  
Kelvin Probe ◽  
Al Doping ◽  
X Ray ◽  
Force Microscopy ◽  
Order Of Magnitude ◽  
Doped Zno

Pure and Al-doped (3 at.%) ZnO nanorods were prepared by two-step synthesis. In the first step, ZnO thin films were deposited on silicon wafers by spin coating; then, ZnO nanorods (NR) and Al-doped ZnO NR were grown using a chemical bath method. The structural properties of zincite nanorods were determined by X-ray diffraction (XRD) and corroborated well with the morphologic properties obtained by field-emission gun scanning electron microscopy (FEG SEM) with energy-dispersive X-ray spectroscopy (EDS). Morphology results revealed a minute change in the nanorod geometry upon doping, which was also visible by Kelvin probe force microscopy (KPFM). KPFM also showed preliminary electrical properties. Detailed electrical characterization of pure and Al-doped ZnO NR was conducted by temperature-dependent current–voltage (I–V) measurements on Au/(Al)ZnO NR/n-Si junctions. It was shown that Al doping increases the conductivity of ZnO NR by an order of magnitude. The I–V characteristics of pure and Al-doped ZnO NR followed the ohmic regime for lower voltages, whereas, for the higher voltages, significant changes in electric conduction mechanisms were detected and ascribed to Al-doping. In conclusion, for future applications, one should consider the possible influence of the geometry change of (Al)ZnO NRs on their overall electric transport properties.

Enhancement of Triboactivity of Nanolamellar Graphitic-C3N4 by N-Doped ZnO Nanorods

2021 ◽  
Vol 60 (2) ◽  
pp. 864-874
Author(s):  
Alok K. Singh ◽  
Nivedita Shukla ◽  
Dinesh K. Verma ◽  
Kavita ◽  
Bharat Kumar ◽  
...  
Keyword(s):  
Zno Nanorods ◽  
Doped Zno

scholarly journals Doping of Mg on ZnO Nanorods Demonstrated Improved Photocatalytic Degradation and Antimicrobial Potential with Molecular Docking Analysis

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Muhammad Ikram ◽  
Sidra Aslam ◽  
Ali Haider ◽  
Sadia Naz ◽  
Anwar Ul-Hamid ◽  
...  
Keyword(s):  
Molecular Docking ◽  
Functional Groups ◽  
Zno Nanorods ◽  
Docking Studies ◽  
Trapping Efficiency ◽  
Wurtzite Phase ◽  
Binding Score ◽  
Doped Zno ◽  
Co Precipitation ◽  
Mg Doped

AbstractVarious concentrations of Mg-doped ZnO nanorods (NRs) were prepared using co-precipitation technique. The objective of this study was to improve the photocatalytic properties of ZnO. The effect of Mg doping on the structure, phase constitution, functional groups presence, optical properties, elemental composition, surface morphology and microstructure of ZnO was evaluated with XRD, FTIR, UV–Vis spectrophotometer, EDS, and HR-TEM, respectively. Optical absorption spectra obtained from the prepared samples showed evidence of blueshift upon doping. XRD results revealed hexagonal wurtzite phase of nanocomposite with a gradual decrease in crystallite size with Mg addition. PL spectroscopy showed trapping efficiency and migration of charge carriers with electron–hole recombination behavior, while HR-TEM estimated interlayer d-spacing. The presence of chemical bonding, vibration modes and functional groups at the interface of ZnO was revealed by FTIR and Raman spectra. In this study, photocatalytic, sonocatalytic and sonophotocatalytic performance of prepared NRs was systematically investigated by degrading a mixture of methylene blue and ciprofloxacin (MBCF). Experimental results suggested that improved degradation performance was shown by Mg-doped ZnO NRs. We believe that the product synthesized in this study will prove to be a beneficial and promising photocatalyst for wastewater treatment. Conclusively, Mg-doped ZnO exhibited substantial (p < 0.05) efficacy against gram-negative (G-ve) as compared to gram-positive (G+ve) bacteria. In silico molecular docking studies of Mg-doped ZnO NRs against DHFR (binding score: − 7.518 kcal/mol), DHPS (binding score: − 6.973 kcal/mol) and FabH (− 6.548 kcal/mol) of E. coli predicted inhibition of given enzymes as possible mechanism behind their bactericidal activity.

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