نتایج جستجو برای: and sesn nanocrystals

تعداد نتایج: 16830312  

2016
Huilin He Qiang Liu Dandan Yang Qiwen Pan Jianrong Qiu Guoping Dong

Monodisperse lanthanide oxyfluorides LnOF (Ln = Gd, Y) with mid-infrared emissions were controllably synthesized via a mild co-precipitation route and a subsequent heat-treatment. The detailed composition and morphology were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and high resolution transmission electron microscopy (HRTEM). The results showed that monodispe...

2013
Yizheng Jin Qing Yi Yuping Ren Xin Wang Zhizhen Ye

Molecular mechanisms and precursor conversion pathways associated with the reactions that generate colloidal nanocrystals are crucial for the development of rational synthetic protocols. In this study, Fourier transform infrared spectroscopy technique was employed to explore the molecular mechanism associated with the formation of tin-doped indium oxide (ITO) nanocrystals. We found that the rea...

2014
Nicolas P. E. Barry Anaïs Pitto-Barry Ana M. Sanchez Andrew P. Dove Richard J. Procter Joan J. Soldevila-Barreda Nigel Kirby Ian Hands-Portman Corinne J. Smith Rachel K. O’Reilly Richard Beanland Peter J. Sadler

Metal nanocrystals offer new concepts for the design of nanodevices with a range of potential applications. Currently the formation of metal nanocrystals cannot be controlled at the level of individual atoms. Here we describe a new general method for the fabrication of multi-heteroatom-doped graphitic matrices decorated with very small, ångström-sized, three-dimensional (3D)-metal crystals of d...

2017
Sung Jun Lim André Schleife Andrew M. Smith

Optical, electronic and structural properties of nanocrystals fundamentally derive from crystal phase. This is especially important for polymorphic II-VI, III-V and I-III-VI2 semiconductor materials such as cadmium selenide, which exist as two stable phases, cubic and hexagonal, each with distinct properties. However, standard crystallographic characterization through diffraction yields ambiguo...

2012
Leisha M. Armijo Yekaterina I. Brandt Dimple Mathew Surabhi Yadav Salomon Maestas Antonio C. Rivera Nathaniel C. Cook Nathan J. Withers Gennady A. Smolyakov Natalie Adolphi Todd C. Monson Dale L. Huber Hugh D. C. Smyth Marek Osiński

Magnetic nanocrystals have been investigated extensively in the past several years for several potential applications, such as information technology, MRI contrast agents, and for drug conjugation and delivery. A specific property of interest in biomedicine is magnetic hyperthermia-an increase in temperature resulting from the thermal energy released by magnetic nanocrystals in an external alte...

Journal: :Nanoscale 2010
L W Yang Y Y Zhang J J Li Y Li J X Zhong Paul K Chu

Lanthanide (Ln3+) doped KGdF4 (Ln=Yb3+, Er3+, Ho3+, Tm3+) nanocrystals with a mean diameter of approximately 12 nm were synthesized by a hydrothermal method using oleic acid as a stabilizing agent at 180 °C. The nanocrystals crystallize in the cubic phase as α-NaGdF4. When excited by a 980 nm laser, these Ln3+ doped nanocrystals exhibit multicolor up-conversion (UC) emissions in red, yellow, bl...

2016
Rainer J Hebert John H Perepezko Harald Rösner Gerhard Wilde

Nanocrystals develop in amorphous alloys usually during annealing treatments with growth- or nucleation-controlled mechanisms. An alternative processing route is intense deformation and nanocrystals have been shown to develop in shear bands during the deformation process. Some controversy surrounded the idea of adiabatic heating in shear bands during their genesis, but specific experiments have...

2010
D. H. Rich Y. Estrin O. Moshe Sayan Bhattacharyya A. Gedanken

ZnxCd1-xSe/C core/shell nanocrystals with 31-39 nm diameter semiconductor cores and 11-25 nm-thick carbon shells were synthesized from solid state precursors in large scale amounts. Transmission electron microscopy (TEM) showed striations in the nanocrystals that are indicative of a composition modulation, and reveal a chemical phase separation and possible spinodal decomposition within the nan...

Journal: :Chemical Society reviews 2014
Xiaoyu Cheng Stuart B Lowe Peter J Reece J Justin Gooding

Concerns over possible toxicities of conventional metal-containing quantum dots have inspired growing research interests in colloidal silicon nanocrystals (SiNCs), or silicon quantum dots (SiQDs). This is related to their potential applications in a number of fields such as solar cells, optoelectronic devices and fluorescent bio-labelling agents. The past decade has seen significant progress in...

Journal: :Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy 2015
M Sajimol Augustine Abdulaziz Anas Ani V Das S Sreekanth S Jayalekshmi

Highly luminescent, manganese doped, zinc sulphide (ZnS:Mn) nanocrystals biofunctionalized with chitosan and various aminoacids such as L-citrulline, L-lysine, L-arginine, L-serine, L-histidine and glycine were synthesized by chemical capping co-precipitation method at room temperature, which is a simple and cost effective technique. The synthesized nanocrystals were structurally characterized ...

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