Journal ArticleDOI
Blue shift in ultraviolet absorption spectra of monodisperse CeO2−x nanoparticles
TLDR
In this article, the authors obtained blue shifts corresponding to the absorption edge in the UV-A (310-400 nm) range from ultraviolet (UV) absorption spectra of monodisperse CeO2−x (0 <x<0.5) nanoparticles, which are produced as toluene suspensions by a successive microemulsification method.Abstract:
Blue shifts corresponding to the absorption edge in the UV-A (310–400 nm) range are obtained from ultraviolet (UV) absorption spectra of monodisperse CeO2−x (0<x<0.5) nanoparticles, which are produced as toluene suspensions by a successive microemulsification method. The blue shift of the nanoparticles is inversely proportional to the 2.2 power of the particle size for a direct transition, but no relation is found for an indirect transition. In contrast, the shift for thin films of 100–200 nm thickness exhibits a relation nearly inverse proportional to the square root of the thickness for the direct transition. These relations are different from that for the quantum size effect, though the difference is small for the nanoparticles. A possible explanation for the blue shift is a valence change of the Ce ions.read more
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Heavy metal removal from water/wastewater by nanosized metal oxides: a review.
TL;DR: The present review mainly focuses on NMOs' preparation, their physicochemical properties, adsorption characteristics and mechanism, as well as their application in heavy metal removal.
Journal ArticleDOI
Shape-selective synthesis and oxygen storage behavior of ceria nanopolyhedra, nanorods, and nanocubes.
Hao-Xin Mai,Ling-Dong Sun,Ya-Wen Zhang,Rui Si,Wei Feng,Hongpeng Zhang,Haichao Liu,Chun-Hua Yan +7 more
TL;DR: Oxygen storage capacity (OSC) measurements at 400 degrees C revealed that the oxygen storage takes place both at the surface and in the bulk for the as-obtained CeO2 nanorods and nanocubes, but is restricted at thesurface for the nanopolyhedra just like the bulk one, which suggests that high OSC materials might be designed and obtained by shape-selective synthetic strategy.
Journal ArticleDOI
Nanostructured ceria-based materials: synthesis, properties, and applications
Chunwen Sun,Hong Li,Liquan Chen +2 more
TL;DR: In this article, the authors present the recent technological and theoretical advances related to the CeO2-based nanomaterials, with a focus on the synthesis from one dimensional to mesoporous ceria as well as the properties from defect chemistry to nano-size effects.
Journal ArticleDOI
Two-Inch-Sized Perovskite CH3NH3PbX3 (X = Cl, Br, I) Crystals: Growth and Characterization
Yucheng Liu,Zhou Yang,Dong Cui,Xiaodong Ren,Jiankun Sun,Xiaojing Liu,Jingru Zhang,Qingbo Wei,Haibo Fan,Fengyang Yu,Xu Zhang,Changming Zhao,Shengzhong Frank Liu,Shengzhong Frank Liu +13 more
TL;DR: Two-inch-sized perovskite crystals, CH3 NH3 PbX3 (X=I, Br, Cl), with high crystalline quality are prepared by a solution-grown strategy, which is expected to transform its broad applications in photovoltaics, optoelectronics, lasers, photodetectors, LEDs, etc., just as crystalline silicon has done in revolutionizing the modern electronics and photov electricity industries.
References
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Journal ArticleDOI
Characterization of Cerium(IV) Oxide Ultrafine Particles Prepared Using Reversed Micelles
Toshiyuki Masui,Kazuyasu Fujiwara,and Ken-ichi Machida,Gin-ya Adachi,Takao Sakata and,Hirotaro Mori +5 more
TL;DR: In this paper, high-resolution electron microscope (HREM) observations revealed that nanometer-sized cerium(IV) oxide ultrafine particles were formed using a reaction within reversed micelles, which was known as a microemulsion method.
BookDOI
Environmental UV photobiology
TL;DR: In this paper, the authors look at the global depletion of stratospheric ozone and the consequences of predicted increases of solar ultraviolet radiation and the adverse effects of various aspects of human health that are anticipated in response to a change in level of solar UV-B, four dealing specifically with skin cancer.
Journal ArticleDOI
Optical Properties of Pure CeO2 and Mixed CeO2/SnO2 Thin Film Coatings
Z. Crnjak Orel,B. Orel +1 more
Journal ArticleDOI
Room-temperature conductance spectroscopy of CdSe quantum dots using a modified scanning force microscope
TL;DR: The conductance of isolated CdSe quantum dots of 4 nm diameter, epitaxially electrodeposited on gold substrates, has been studied using a scanning force microscope with a metallized tip to perform current-voltage spectroscopy.