In the advancement of metal–oxide–semiconductor technology, Si-based semiconductor, with SiO2 as outstanding dielectric, has been dominating microelectronic industry for decades. However, the drastic down-scaling in ultra-large-scale integrated circuitry has made ultrathin SiO2 (~1.2 nm) unacceptable for many practical reasons. …
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The catalytic transformation of renewable fatty acids into value-added fatty alcohols without the use of gaseous hydrogen is a versatile technique for the utilization of microalgae and waste cooking oil, where Cu-based catalysts are considered to be the most suitable candidate. However, the interpretation of the structure–reactivity relationship …
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[49] CV of ZrO2-1, ZrO2-2 and ZrO2-3 in KCl electrodes at scanning rate of (a) 10 mV/s, (b) 20 mV/s, (c) 30 mV/s, (d) 50 mV/s, and (e) 100 mV/s. Moreover, the CV …
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Abstract. In this investigation, well defined mesoporous zirconia nanoparticles (ZrO 2 NPs) with cubic, tetragonal or monoclinic pure phase were …
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The conversion of CO 2 to C 2 H 4, especially via the electrochemical CO 2 reduction reaction (CO 2 RR), is one of the promising approaches for utilizing CO 2 and producing important light olefins. Developing efficient catalysts is the key to realizing this conversion. In the present work, we have prepared several Cu–Zr bimetallic catalysts …
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Abstract. The existence of a morphotropic phase boundary (MPB) inside HfO 2 –ZrO 2 solid solution thin films has been predicted; if it exists, it provides a new path toward an ideal silicon-compatible dielectric. Herein, we investigate the structural evolution along with the dielectric and ferroelectric behaviors of differently designed HfO 2 ...
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The chemical bonding states between molybdenum and oxygen atoms in MoO 3 NPs were investigated using FT-IR. Fig. 2 depicts the FT-IR spectrum of MoO 3 nanobelts acquired in the 4000–400 cm −1 range. MoO 3 predominantly exhibits three peaks at 881, 995, 1400, and 1630 cm −1, which are connected with the stretching mode of oxygen …
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Publication Date: July 23, 2009 https://doi/10.1021/cg800711m Copyright © 2009 American Chemical Society Request reuse permissions Article Views 3997 Altmetric - …
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A highly stable Ni-ZrO2 nanoshell catalyst is produced by a continuous flame aerosol process and Ni exsolution. Its notable characteristics include abundant oxygen vacancies and strong metal …
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Tetragonal zirconia (t-ZrO 2) nanoparticles were successfully prepared by a hydrothermal method and characterized by various measurement techniques.The tetragonal crystalline structure of ZrO 2 nanoparticles were confirmed by X-ray diffraction analysis. The binding energies of Zr and O were confirmed from the XPS spectrum. The band gap …
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The matrix consists of alumina and zirconia grains with grain sizes/diameter of approximately 220 and 160 nm with approximately 1.9 μm cBN grains in the Al2O3 + ZrO2 + cBN composites. The ...
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HfO 2 and ZrO 2 thin films have many applications, for example HfO 2 films are used as heat mirrors for energy-efficient windows, 1 both ZrO 2 and HfO 2 can serve as optical coatings, 2–4 waveguides, 5–7 gas sensors, 8–10 gate dielectrics in transistors. 11–13 Proposed applications also include novel memory materials, such as resistive …
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The activity of Ni/ZrO2 was completely restored after the in-situ regeneration with CO2, indicating that carbon deposition was greatly removed by CO2. ... Ni/ZrO 2 and Ni/SBA-15 catalysts were prepared by a conventional wet impregnation method. The loading of Ni was 5 wt%. The samples were dried at 110 °C for 12 h and calcined at 650 °C for 4 h.
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The influence of the phase of the ZrO2 support (monoclinic, tetragonal, and amorphous, referred to as m-, t-, and am-, respectively) on the nature of the surface species involved in methanol synthesis and the rates of their formation on ZrO2-supported, In-based catalysts for CO2 hydrogenation has been investigated. In situ diffuse reflectance …
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This paper investigates the impacts of post-rapid thermal anneal (RTA) and thickness of ZrO2 on the polarization P and electrical characteristics of TaN/ZrO2/Ge capacitors and FeFETs, respectively. After the RTA ranging from 350 to 500 °C, TaN/ZrO2/Ge capacitors with 2.5 and 4 nm-thick amorphous ZrO2 film exhibit the stable …
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2.2. Synthesis of ZrO 2 Nanoparticles. Synthesis of ZrO 2 nanoparticles was done by sol–gel method as described by previous literature 29 with some modifications. Zirconium butoxide [Zr(OC 4 H 9) 4] (3.658 mL) was added to 10 mL of acetic acid followed by 20 mL of water dropwise.A transparent sol was obtained within 15 min followed with …
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The ZrO 2 nanoparticles have been created with coprecipitation . The ZrO 2-CeO was synthesized by two different methods: first one is by sol-gel method, and second one is by coprecipitation method. In the coprecipitation and sol-gel synthesis route of the obtained materials, it was reported that the texture and structural properties depend on ...
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For the ZrO 2-CNTs prepared at 150, 200, 250 °C, the peaks located at 36° correspond well to the plane (101) of tetragonal ZrO 2 (JCPDS PDF No. 50-1089). This is consistent to Liu's work [Reference Liu, Meng, Banis, Cai, Li and Sun 26]. Because the deposited ZrO 2 films were pretty thin, other XRD peaks of ZrO 2 are not identifiable. At low ...
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Wide band gap metal oxide nanoparticles have attracted scientific attention due to their wide range applications. Zirconium oxide (ZrO 2) also known as zirconia with its excellent chemical and physical properties have applications such as fuel cells [], gas sensors [], optoelectronics [], catalyst [], and corrosion resistant material [].With band gap …
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The results obtained from the characterization techniques con fi rm the formation of ZrO 2, ZnO, and ZrO 2 − ZnO nanoparticles with diameter sizes of 76, 22, and 26 − 34 nm, respectively. SEM ...
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2. Materials Science, Engineering and Commercialization, Texas State University, San Marcos, TX-78666, USA. Ferroelectricity is demonstrated for the first time in Si (100)/SiO 2 /TiN/HfO 2 -ZrO 2 /TiN stack using pulsed laser deposition (PLD) and the effects of temperatures, partial oxygen pressures, and thickness for the stabilization of …
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The rational design and preparation of a high-performance catalyst for biomass upgrading are of great significance and remain a great challenge. In this work, mesoporous ZrO 2 nanoframe, hollow ring, sphere, and …
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In addition, in the region from ZrO 2 – 0% Al 2 O 3 up to ZrO 2 – 25% Al 2 O 3, temperature up to 1100 °C, and grain size below 50 nm stable t-ZrO 2 solid solution was found.
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2. Candidate ZrO Structures. We generated candidate ZrO structures using an ab initio random structure searching (AIRSS) algorithm.[22,24] Figure 1 shows the relative energies of the predicted ZrO structures together with a number of other Zr x O Y stoichiometries.The search identified two low energy ZrO structures, which are …
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Waghmare et al. explained the effect of annealing temperature on the structural and optical properties of nano-ZrO 2. To synthesize nanocrystalline ZrO2, zirconyl chloride octahydrate, ethylenediaminetetraacetic acid (EDTA) and ammonium hydroxide were mixed and then dried. Subsequently, the dried gel was annealed at 650 °C, 750 °C …
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on the morphology and size range of ZrO 2 is given in Table 1. The comprehensive details of the chemical methods are given below. (i) Microwave-assisted approach. Microwave-assisted approaches are quite popular as they are facile, advantageous, rapid, and energy efficient and hence, have been extensively employed in nanomaterial synthesis.
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Pollution and diseases such as the coronavirus pandemic (COVID-19) are major issues that may be solved partly by nanotechnology. Here we review the synthesis of ZrO 2 nanoparticles and their nanocomposites using compounds from bacteria, fungi, microalgae, and plants. For instance, bacteria, microalgae, and fungi secret bioactive …
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Similar trends are observed between phases of ZrO 2.Simulated spectra with the nanoscale disorder parameterization and a binding energy offset ΔE 0 = −8 eV are shown in Figure 3 along with spectra simulated using the bulk disorder parameterization, which agree well with experimental spectra for bulk m-ZrO 2 and t-ZrO 2.The m and oFE …
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Here, we reported an innovative and electrochemical biosensor for the rapid detection of Escherichia coliO157:H7. We fabricated the mesoporous ZrO2-Ag-G-SiO2 (ZAGS) and In2O3-G-SiO2 (IGS) sensors ...
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a-ZrO 2 structures. 17 In this m ethod, one optimizes th e struc- tures many times to determine a local en ergy minima (in con - figurational space) using a force field which can b e calculated
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ZrO2 is Baddeleyite structured and crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Zr4+ is bonded to seven O2- atoms to form a mixture of distorted corner and edge-sharing ZrO7 pentagonal bipyramids. There are a spread of Zr–O bond distances ranging from 2.07–2.31 Å. ... ZrO 2 ID: mp-2858 DOI: 10. ...
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The effect of the ZrO2 crystal form on surface-enhanced Raman scattering (SERS) activity was studied. The ratio of the tetragonal (T) and monoclinic (M) phases of ZrO2 nanoparticles (ZrO2 NPs) was controlled by regulating the ratio of two types of additives in the hydrothermal synthesis method. The SERS intensity of 4 …
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The pure zirconia has three different crystal structures: monoclinic, m-ZrO2, tetragonal, t-ZrO2, and cubic, c-ZrO2. The main purpose of writing this review article is: on the surface of ...
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Abstract. Pure and nickel doped zirconium oxide (ZrO 2) samples namely N1, N2, N3, N4 have been synthesized by sol–gel method at different doping …
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In this study, thin-film coating of zirconium oxide (ZrO2) was prepared by sol-gel method and subsequent heat treatment process. The sol was prepared by controlled hydrolysis of zirconium tetrapropoxide using acetic acid and ethanol/acetylacetone mixture as catalyst and chelating agent, respectively, and finally deposited onto the 316L …
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The salinized ZrO2 particles were weighed using an electronic balance and added in concentrations of 1wt %, 2.5wt %, and 5wt % of auto-polymerized acrylic …
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To synthesize nanocrystalline ZrO2, zirconyl chloride octahydrate, ethylenediaminetetraacetic acid (EDTA) and ammonium hydroxide were mixed and then …
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Zirconium oxide (ZrO 2 or zirconia) nanostructures were synthesized by a hydrothermal route. Surface morphology analysis depicts the formation of various zirconia nanostructures at different synthesis conditions. X-ray diffraction examination demonstrates that the as-synthesized zirconia is of pure monoclinic phase (m-ZrO 2).High resolution transmission …
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Here, the authors design a Cu1/ZrO2 single-atom catalyst featuring a Cu1–O3 site responsible for a remarkable performance at 180 °C. The massive burning of fossil fuels in recent decades has led to a dramatic increase in CO 2 greenhouse gas emissions, ... (Cu 1 /amorphous-ZrO 2) for hydrogenation of CO 2 to methanol at low …
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Addition of zirconia (ZrO2) to nuclear waste glasses, even in small amount, significantly affects physical properties such as chemical durability, density, viscosity, and glass transition temperature.
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