Synthesis and characterization of ZnO nanowires for nanosensor applications

Lupan, Oleg; Емельченко, Г. А.; Ursaki, V. V.; Chai, Guangyu; Редькин, А. Н.; Грузинцев, А. Н.; Tiginyanu, I. M.; Chow, Lee; Ono, Luis K.; Cuenya, Beatriz Roldán; Heinrich, Helge; Yakimov, E. E.

doi:10.1016/j.materresbull.2010.03.027

Cited by 244 publications

(126 citation statements)

References 59 publications

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“…Binding energies were calibrated by shifting the C 1s peak position to 285.0 eV. [9][10][11][12] The sheet resistance was determined independently by the transfer length method for an electrode distance of 100-500 µm. Electron mobility was evaluated by the van der Pauw method.…”

Section: Methodsmentioning

confidence: 99%

Effects of Thermal Pressing on ZnO Nanoparticle Layers Deposited by Drop Casting

Yoshida

Shinohara

Itohara

et al. 2016

e-J. Surf. Sci. Nanotech.

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ZnO nanoparticle (NP) layers were formed using a simple drop casting process. Applying thermal pressing clearly improved the surface morphology and electrical properties of the as-deposited ZnO NP layers as well as significantly enhanced the transistor characteristics of the NP layers. The effects of thermal pressing on the film surface properties were evaluated by X-ray photoelectron spectroscopy, Kelvin probe microscopy, and photoluminescence spectroscopy. Results suggest that thermal pressing improved the transistor characteristics by decreasing NP surface defects such as oxygen vacancies.

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Section: Methodsmentioning

confidence: 99%

Effects of Thermal Pressing on ZnO Nanoparticle Layers Deposited by Drop Casting

Yoshida

Shinohara

Itohara

et al. 2016

e-J. Surf. Sci. Nanotech.

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“…The use of low dimensional structures is a key technological factor in the creation of new functional and sensing devices which benefit from their large surface area to volume ratio [7][8][9] .…”

Section: Introductionmentioning

confidence: 99%

Electrical, photoelectrical and morphological properties of ZnO nanofiber networks grown on SiO2 and on Si nanowires

et al. 2013

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ZnO nanofibre networks (NFNs) were grown by vapour transport method on Si-based substrates. One type of substrate was SiO 2 thermally grown on Si and another consisted of a Si wafer onto which Si nanowires (NWs) had been grown having Au nanoparticles catalysts. The ZnO-NFN morphology was observed by scanning electron microscopy on samples grown at 600 °C and 720 °C substrate temperature, while an focused ion beam was used to study the ZnO NFN/Si NWs/Si and ZnO NFN/SiO 2 interfaces. Photoluminescence, electrical conductance and photoconductance of ZnO-NFN was studied for the sample grown on SiO 2 . The photoluminescence spectra show strong peaks due to exciton recombination and lattice defects. The ZnO-NFN presents quasi-persistent photoconductivity effects and ohmic I-V characteristics which become nonlinear and hysteretic as the applied voltage is increased. The electrical conductance as a function of temperature can be described by a modified three dimensional variable hopping model with nanometer-ranged typical hopping distances.

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“…4b) displays a doublet at 1042.6 and 1019.6 eV corresponding to Zn 2p 1/2 and 2p 3/2 , which are typical of ZnO. 31 The peak at 528.5 eV in O 1s region (Fig. 4c) is assigned to O 2− ions in the ZnO Wurtzite structure.…”

Section: Resultsmentioning

confidence: 94%

Photochemical Deposition of Co-Ac Catalyst on ZnO Nanorods for Solar Water Oxidation

Irshad

Munichandraiah

2015

J. Electrochem. Soc.

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The preparation of ZnO nanorod films decorated with cobalt-acetate (CoAc) electrocatalyst and its activity for photoelectrolysis of water have been demonstrated. The photochemically prepared CoAc catalyst is chemically and morphologically similar to the electrochemically prepared CoAc catalyst. The on-set potential of oxygen evolution reaction is lower on CoAc-ZnO photoanode in relation to bare ZnO photoanode. There is a three to four fold increase in photooxidation current of OER due to the presence of CoAc co-catalyst on ZnO. Thus, the photochemically prepared CoAc on ZnO is an alternative and efficient co-catalyst for photoelectrochemical oxygen evolution reaction. The enhancement in photocatalytic activity of ZnO by the CoAc catalyst photochemically deposited from acetate buffer solution is significantly greater than the cobalt-phosphate (CoPi) co-catalyst deposited from phosphate buffer solution. Hydrogen is a convenient fuel for the future owing to its high energy density and eco-friendliness.1,2 Currently, around 48 million metric tons of H 2 is produced globally each year mainly from natural gas by steam-methane reforming method. 3,4 As this process leads to the emission of a large amount of CO 2 (240 mega tons per year), it is challenging to develop alternate, clean methods to produce hydrogen. Generation of hydrogen gas from water requires energy of 273 kJ mol −1 . If this energy is available from a renewable energy source such as solar energy, hydrogen can be considered as an economical and green energy source, which is an alternative to fossil fuels.A simple approach is to use photovoltaic cells to power water electrolyzers. However, diurnal variation in the sunlight intensity, a high cost and a low conversion efficiency impede successful commercialization of the present photovoltaic cells. 5 Another approach is to store solar energy directly in the chemical bonds of small molecules, similar to the photosynthesis route adopted by vegetation. A typical example is the photodissociation of water to generate hydrogen fuel. 6 The first report on photodissociation of water into H 2 and O 2 using ntype TiO 2 photoanode and Pt black cathode was reported by Fujishima and Honda 7 in 1972. Following this report, numerous investigations have been reported for photocatalytic and photoelectrochemical water splitting.8 Most of the studies suffer from poor solar to hydrogen conversion efficiency due to fast recombination of photogenerated charge carriers and poor catalytic activity of semiconductor electrodes toward multi-electron oxygen evolution reaction (OER) at the photoanode. 8,9 Several metal oxides such as RuO 2 , 10,11 IrO 2 12,13 etc., are coupled with semiconductor anodes (TiO 2 , ZnO, etc.) as co-catalysts to enhance the sluggish kinetics of water oxidation. However, high cost of Ru and Ir limit their widespread application. Recently, a cobaltphosphate complex (CoPi) are no reports on the photochemical deposition of CoAc catalyst on a n-type semiconductor electrode and its utilization as a co-catalyst i...

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Synthesis and characterization of ZnO nanowires for nanosensor applications

Cited by 244 publications

References 59 publications

Effects of Thermal Pressing on ZnO Nanoparticle Layers Deposited by Drop Casting

Effects of Thermal Pressing on ZnO Nanoparticle Layers Deposited by Drop Casting

Electrical, photoelectrical and morphological properties of ZnO nanofiber networks grown on SiO2 and on Si nanowires

Photochemical Deposition of Co-Ac Catalyst on ZnO Nanorods for Solar Water Oxidation

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