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7440-67-7Relevant articles and documents
A New Patterning Method Using Photocatalytic Lithography and Selective Atomic Layer Deposition
Lee, Jae P.,Sung, Myung M.
, p. 28 - 29 (2004)
We report a new patterning method using photocatalytic lithography of alkylsiloxane self-assembled monolayers and selective atomic layer deposition of thin films. The photocatalytic lithography is based on the fact that the decomposition rate of the alkylsiloxane monolayers in contact with TiO2 is much faster than that with SiO2 under UV irradiation in air. The photocatalytic lithography, using a quartz plate coated with patterned TiO2 thin films, was done to prepare patterned monolayers of the alkylsiloxane on Si substrates. A ZrO2 thin film was selectively deposited onto the monolayer-patterned Si substrate by atomic layer deposition. Copyright
Characteristics of ZrO2 films with Al and Pt gate electrodes
Nam, Seok-Woo,Yoo, Jung-Ho,Nam, Suheun,Ko, Dae-Hong,Yang, Cheol-Woong,Ku, Ja-Hum
, p. G849-G853 (2003)
We investigated interfacial stabilities of ZrO2 films with Al and Pt electrodes formed by magnetron sputtering upon annealing and consequent changes of their metal-oxide-semiconductor capacitor characteristics. The as-deposited ZrO2 films deposited using a sputtering power of 300 W were amorphous, while after annealing in N2 at 600°C for 5 min the films became polycrystalline with a mixture of monoclinic and tetragonal phases. After the deposition of electrodes, we found that the amorphous interlayer which is presumed to be Al2O3 was formed at the ZrO2/Al interface, while platinum (Pt) electrodes showed no interlayer at the interface with ZrO2 films. The value of the capacitance equivalent thickness for the ZrO2 film with the Al electrode was larger than that of the case with the Pt electrode by about 12 A, which is due to the presence of the additional Al2O3 interlayer at the Al/ZrO2 interface. The capacitance-voltage measurement showed that the difference in flatband voltage (VFB) between the ZrO2 films and the two different electrodes is about 1.2 V, which is due to the work function difference between the two electrode materials.
Search for ferromagnetism in manganese-stabilized zirconia
Dimri, M. Chandra,Kooskora,Pahapill,Joon,Heinmaa,Subbi,Stern
, p. 172 - 179 (2011)
Magnetic properties of Mn-stabilized cubic zirconia (ZrO2) powder samples were investigated to verify the recent theoretical predictions of ferromagnetism in transition-metal-doped ZrO2. It was found that 5% Mn-doped cubic ZrO2
Fabrication and characterization of smooth high aspect ratio zirconia nanotubes
Tsuchiya, Hiroaki,MacAk, Jan M.,Taveira, Luciano,Schmuki, Patrik
, p. 188 - 191 (2005)
In the present work, we report formation of high aspect ratio zirconia nanotubes by electrochemical anodization of zirconium in a 1 M (NH 4)2SO4 electrolyte containing 0.5 wt% NH 4F. Highly self-organized zirconia nanotubes can be formed with a diameter of ≈50 nm and a length of ≈17 μm, i.e. with an aspect ratio of more than 300. The nanotubes show a distinct smooth and straight morphology. XRD investigation reveals that the nanotubes have a cubic crystalline structure directly after anodization, that is, without any further annealing.
Preparation of ultrafine zirconium dioxide particles by thermal decomposition of zirconium alkoxide vapour
Adachi, Motoaki,Okuyama, Kikuo,Moon, Seongwon,Tohge, Noboru,Kousaka, Yasuo
, (1989)
Ultrafine zirconia particles are produced by thermal decomposition of zirconium tetratertiary butoxide (ZrTB) vapour. The introduction of ZrTB vapour into the cylindrical electric furnace, is achieved by three different methods: (evaporator, pressurized n
Microstructure and oxidation-resistant property of sol-gel derived ZrO2-Y2O3 films prepared on austenitic stainless steel substrates
Miyazawa,Suzuki,Wey
, p. 347 - 355 (1995)
The effect of Y2O3 addition to the oxidation resistance of sol-gel-derived zirconia films coated on austenitic stainless steel substrates was examined. The oxidation weight gain measurement and XRD analyses of oxides showed that addi
One-step controllable synthesis for high-quality ultrafine metal oxide semiconductor nanocrystals via a separated two-phase hydrolysis reaction
Tang, Kangjian,Zhang, Jianan,Yan, Wenfu,Li, Zhonghua,Wang, Yangdong,Yang, Weimin,Xie, Zaiku,Sun, Taolei,Fuchs, Harald
, p. 2676 - 2680 (2008)
A one-step synthesis method is described to prepare high-quality ultrafine inorganic semiconductor nanocrystals via a two-phase interface hydrolysis reaction under hydrothermal conditions. With the synthesis of ZrO2 quantum dots as an example, we show that the prepared nanocrystals have good monodispersity and high crystallinity, as well as other related superior properties, e.g., strong photoluminescence and excellent photocatalytic activities. Also the crystal size can be conveniently adjusted in the range below 10 nm through controlling the reaction temperature. Besides that, this method also shows other distinct advantages compared with other methods reported previously. First, the preparation process is simple and cheap and does not contain any complicated posttreatment procedure. Second, products (without coating) can be collected from the organic phase which effectively avoids grain aggregation induced by the capillary concentration in the water environment. Third, the production yield is very high (almost 100%) and the organic and water phases after reaction can be easily recycled for next reaction. Therefore, it provides a promising strategy for the large-scale industrial production of different kinds of high-quality inorganic nanocrystals.
An in situ infrared study of dimethyl carbonate synthesis from carbon dioxide and methanol over zirconia
Bell,Jung
, p. 339 - 347 (2001)
IR spectroscopy was used to study the mechanism of dimethyl carbonate (DMC) synthesis from methanol and CO2 over monoclinic zirconia. The dissociative adsorption of methanol occurred more slowly than CO2 adsorption, but the species formed from methanol were bound more strongly. On adsorption, the oxygen atom of methanol binded to coordinately unsaturated Zr4+ cations present at the catalyst surface. Rapid dissociation of the adsorbed methanol resulted in the formation of a methoxide group (Zr-OCH3) and the release of a proton, which reacted with a surface hydroxyl group to produce water. CO2 inserted into the Zr-O bond of the methoxide to form a mondentate methyl carbonate group (Zr-OC(O)OCH3). This process was facilitated by the interaction of C and O atoms in CO2 with Lewis acid-base pairs of sites (Zr4+O2-) on the surface of the catalyst. Methyl carbonate species could also be produced via the reaction of methanol with CO2 adsorbed in the form of bicarbonate species, but this process was slower than that involving the reaction of CO2 with methoxide species. DMC was formed by reaction of the methyl carbonate species with methanol, a process that led to the transfer of a methyl group to the carbonate and restored a hydroxyl group to the zirconia surface. DMC decomposition on monoclinic zirconia occurred via the reverse of the process described for DMC synthesis.
Synthesis of ZrO2 nanoparticles in microwave hydrolysis of Zr (IV) salt solutions-Ionic conductivity of PVdF-co-HFP-based polymer electrolyte by the inclusion of ZrO2 nanoparticles
Kalyana Sundaram,Vasudevan,Subramania
, p. 264 - 271 (2007)
Nanocrystalline ZrO2 particles have been prepared by microwave hydrolysis of Zr(IV) salt solutions at 400 {ring operator} C for 6 h. The paper describes the PVdF - co - HFP - ZrO2-based NCPEMs prepared by a simple solvent casting technique. The incorporation of ZrO2 nanoparticles in the PVdF-co-HFP matrix, improved the ionic conductivity due to the availability of a large amount of oxygen vacancies on ZrO2 surface which may act as the active Lewis acidic site that interact with ClO4- ions. On the other hand, a high concentration of ZrO2 [10 wt(%)] leads to depression in ionic conductivity due to the formation of more crystalline phase in the PVdF-co-HFP matrix. DSC, XRD, SEM and DC-polarization studies were carried out. This paper also explores and proposes a structure-conductivity correlation in the PVdF - co - HFP - LiClO4 - ZrO2-based NCPEMs system. The proposed correlation is derived from the interpretation of DSC, XRD and AC-impedance measurements. The temperature dependence of the ionic conductivity of NCPEMs follows the Arrhenius behaviour. Finally, the LSV experiment has been carried out to investigate the electrochemical stability in the polymer electrolytes.
Efficient photoluminescence of Dy3+ at low concentrations in nanocrystalline ZrO2
Diaz-Torres,De la Rosa,Salas,Romero,Angeles-Chavez
, p. 75 - 80 (2008)
Nanocrystalline ZrO2:Dy3+ were prepared by sol-gel and the structural and photoluminescence properties characterized. The crystallite size ranges from 20 to 50 nm and the crystalline phase is a mixture of tetragonal and monoclinic structure controlled by dopant concentration. Strong white light produced by the host emission band centered at ～460 nm and two strong Dy3+ emission bands, blue (488 nm) and yellow (580 nm), under direct excitation at 350 nm were observed. The highest efficiency was obtained for 0.5 mol% of Dy3+. Emission is explained in terms of high asymmetry of the host suggesting that Dy3+ are substituted mainly into Zr4+ lattice sites at the crystallite surface. Luminescence quenching is explained in terms of cross-relaxation of intermediate Dy3+ levels.