scholarly journals Hydrothermal Synthesis of Ln(OH)3Nanorods and the Conversion to Ln2O3(Ln = Eu, Nd, Dy) Nanorods via Annealing Process

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Yanhua Zhu ◽  
Xiang Zhai ◽  
Lingling Wang
Keyword(s):  
Optical Properties ◽  
Rare Earth ◽  
Hydrothermal Synthesis ◽  
Physicochemical Properties ◽  
Hydrothermal Method ◽  
Rare Earth Oxides ◽  
Annealing Process ◽  
One Dimensional ◽  
Potential Applications ◽  
Xrd And Tem

One-dimensional rare earth oxides and hydroxides are of importance in many applications due to their rich physicochemical properties. In this work, we synthesized Ln(OH)3(Ln = Eu, Nd, Dy) nanorods by a hydrothermal method with the assistance of n-butylamine as an alkaline resource. The porous Ln2O3nanorods were produced through annealing the corresponding Ln(OH)3nanorods. XRD and TEM techniques were employed to characterize the products. The annealing process and the optical properties of as-synthesized Ln2O3are also investigated by TG and PL test. We expected that these nanomaterials could find potential applications in the future.

scholarly journals Facile Hydrothermal Synthesis and Optical Properties of Monoclinic CePO4 Nanowires with High Aspect Ratio

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Nuengruethai Ekthammathat ◽  
Titipun Thongtem ◽  
Anukorn Phuruangrat ◽  
Somchai Thongtem
Keyword(s):  
Optical Properties ◽  
Hydrothermal Synthesis ◽  
Aspect Ratio ◽  
Hydrothermal Method ◽  
High Aspect Ratio ◽  
Vibration Modes ◽  
Simple Hydrothermal Method ◽  
One Dimensional ◽  
Cerium Phosphate ◽  
Uv Visible

One-dimensional cerium phosphate (CePO4) nanowires (NWs) were successfully synthesized by a facile and simple hydrothermal method at 200°C for 12 h, using Ce(NO3)3·6H2O and Na3PO4·12H2O as starting materials, and followed by pH adjusting to be 1–3 using HNO3 (conc.). Phase, morphologies, and vibration modes of the as-synthesized CePO4 products, characterized by XRD, SEM, TEM, and FTIR, were proved to be perfect and uniform monoclinic CePO4 nanowires with aspect ratio of more than 250 for the product synthesized in the solution with the pH of 1. The UV-visible and photoluminescence (PL) spectrometers were used to investigate optical properties of the as-synthesized monoclinic CePO4 nanowires.

scholarly journals Electronic and Optical Properties of Rare Earth Oxides: <i>Ab Initio</i> Calculation

2015 ◽  
Vol 05 (02) ◽  
pp. 78-85 ◽  
Author(s):  
Sezen Horoz ◽  
Sevket Simsek ◽  
Selami Palaz ◽  
Amirullah M. Mamedov
Keyword(s):  
Optical Properties ◽  
Rare Earth ◽  
Ab Initio ◽  
Rare Earth Oxides ◽  
Electronic And Optical Properties

scholarly journals Hydrothermal Synthesis of Rare-Earth Modified Titania: Influence on Phase Composition, Optical Properties, and Photocatalytic Activity

Materials ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 713 ◽  
Author(s):  
Nejc Rozman ◽  
David Tobaldi ◽  
Uroš Cvelbar ◽  
Harinarayanan Puliyalil ◽  
João Labrincha ◽  
...  
Keyword(s):  
Optical Properties ◽  
Photocatalytic Activity ◽  
Rare Earth ◽  
Hydrothermal Synthesis ◽  
Rare Earth Elements ◽  
Rare Earths ◽  
Light Absorption ◽  
Pure Tio2 ◽  
X Ray ◽  
Hydroxyl Oxygen

In order to expand the use of titania indoor as well as to increase its overall performance, narrowing the band gap is one of the possibilities to achieve this. Modifying with rare earths (REs) has been relatively unexplored, especially the modification of rutile with rare earth cations. The aim of this study was to find the influence of the modification of TiO2 with rare earths on its structural, optical, morphological, and photocatalytic properties. Titania was synthesized using TiOSO4 as the source of titanium via hydrothermal synthesis procedure at low temperature (200 °C) and modified with selected rare earth elements, namely, Ce, La, and Gd. Structural properties of samples were determined by X-ray powder diffraction (XRD), and the phase ratio was calculated using the Rietveld method. Optical properties were analyzed by ultraviolet and visible light (UV-Vis) spectroscopy. Field emission scanning electron microscope (FE-SEM) was used to determine the morphological properties of samples and to estimate the size of primary crystals. X-ray photoelectron spectroscopy (XPS) was used to determine the chemical bonding properties of samples. Photocatalytic activity of the prepared photocatalysts as well as the titania available on the market (P25) was measured in three different setups, assessing volatile organic compound (VOC) degradation, NOx abatement, and water purification. It was found out that modification with rare earth elements slows down the transformation of anatase and brookite to rutile. Whereas the unmodified sample was composed of only rutile, La- and Gd-modified samples contained anatase and rutile, and Ce-modified samples consisted of anatase, brookite, and rutile. Modification with rare earth metals has turned out to be detrimental to photocatalytic activity. In all cases, pure TiO2 outperformed the modified samples. Cerium-modified TiO2 was the least active sample, despite having a light absorption tail up to 585 nm wavelength. La- and Gd-modified samples did not show a significant shift in light absorption when compared to the pure TiO2 sample. The reason for the lower activity of modified samples was attributed to a greater Ti3+/Ti4+ ratio and a large amount of hydroxyl oxygen found in pure TiO2. All the modified samples had a smaller Ti3+/Ti4+ ratio and less hydroxyl oxygen.

Hydrothermal synthesis of LnMnO3 (Ln = Ho–Lu and Y): exploiting amphoterism in late rare-earth oxides

2009 ◽  
Vol 19 (25) ◽  
pp. 4375 ◽  
Author(s):  
Evan S. Stampler ◽  
William C. Sheets ◽  
Wilfrid Prellier ◽  
Tobin J. Marks ◽  
Kenneth R. Poeppelmeier
Keyword(s):  
Rare Earth ◽  
Hydrothermal Synthesis ◽  
Rare Earth Oxides

Unusual upconversion emission from single NaYF4:Yb3+/Ho3+ microrods under NIR excitation

CrystEngComm ◽  
2014 ◽  
Vol 16 (29) ◽  
pp. 6697-6706 ◽  
Author(s):  
Wei Gao ◽  
Hairong Zheng ◽  
Qingyan Han ◽  
Enjie He ◽  
Ruibo Wang
Keyword(s):  
Optical Properties ◽  
Rare Earth ◽  
Optoelectronic Devices ◽  
Upconversion Emission ◽  
Rare Earth Ion ◽  
Potential Applications

Rare earth ion-doped upconversion materials show great potential applications in optical and optoelectronic devices due to their novel optical properties.

The preparation and characterization of one-dimensional TiO2 nanostructure by hydrothermal method

2019 ◽  
Vol 34 (01n03) ◽  
pp. 2040024
Author(s):  
Lin Yu ◽  
Yuan-Yuan Xu ◽  
Jing Zhao ◽  
Jin Xiao ◽  
Wei-Long Xu
Keyword(s):  
Hydrothermal Method ◽  
Sintering Temperature ◽  
Oxide Semiconductor ◽  
Crystalline Quality ◽  
X Ray Diffraction ◽  
One Dimensional ◽  
Physicochemical Stability ◽  
Potential Applications

Titanium dioxide ([Formula: see text]) is a kind of wide bandgap transparent metal oxide semiconductor and has shown great potential applications in photocatalysis, gas sensors and biomedical fields due to its superior properties, such as nontoxic, high photocatalytic efficiency and physicochemical stability. In this work, one-dimensional [Formula: see text] nanostructure was successfully synthesized by hydrothermal method. The morphology and crystalline quality of [Formula: see text] were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD), respectively. The results demonstrate that the structure of [Formula: see text] evolved from “flower-like” structure to nanowire with the acid concentration increment. The sintering temperature has an important effect on the structure and crystalline quality of [Formula: see text]. The crystalline quality of [Formula: see text] nanobelt was improved with the annealing temperature increment. When the sintering temperature increased to 1000[Formula: see text]C, the phase of [Formula: see text] would transfer from anatase to rutile.

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