نتایج جستجو برای: nanocrystal

تعداد نتایج: 3002  

1998
Michael T. Kennedy Brian A. Korgel Harold G. Monbouquette Joseph A. Zasadzinski

Size-quantized CdS nanocrystals of controlled dimensions are synthesized within monodisperse egg lecithin vesicles made by detergent depletion. Cryo-transmission electron microscopy (cryo-TEM) enables imaging in situ both of the vesicle wall and of the encapsulated nanocrystal. Cryo-TEM images confirm that only one particle per vesicle forms and that nanocrystal diameter is determined by the nu...

2001
J. von Borany T. Gebel

The concept of a nanocrystal memory [1,2] has several attractive features. First, it overcomes limitations of current (Flash)-EEPROM technologies: higher endurance and lower voltages become possible enabling further scaling and memories of higher density. Second, the retention characteristics can be possibly tailored from DRAM-like to EEPROM-like memories by adjusting the cluster size and their...

2014
Shigeru Yamada Yasuyoshi Kurokawa Shinsuke Miyajima Makoto Konagai

UNLABELLED The solar cell structure of n-type poly-silicon/5-nm-diameter silicon nanocrystals embedded in an amorphous silicon oxycarbide matrix (30 layers)/p-type hydrogenated amorphous silicon/Al electrode was fabricated on a quartz substrate. An open-circuit voltage and a fill factor of 518 mV and 0.51 in the solar cell were obtained, respectively. The absorption edge of the solar cell was 1...

Journal: :Optics express 2009
Paul E Barclay Charles Santori Kai-Mei Fu Raymond G Beausoleil Oskar Painter

Diamond nanocrystals containing NV color centers are positioned with 100-nanometer-scale accuracy in the near-field of a high-Q SiO(2) microdisk cavity using a fiber taper. The cavity modified nanocrystal photoluminescence is studied, with Fano-like quantum interference features observed in the far-field emission spectrum. A quantum optical model of the system is proposed and fit to the measure...

Journal: :Optics express 2007
Evren Mutlugun Ibrahim M Soganci Hilmi V Demir

We report on the conception, design, fabrication, experimental characterization, and theoretical analysis of nanocrystal scintillators hybridized on Si detectors and CCDs for enhanced detection and imaging in UV. Integrating luminescent CdSe/ZnS core-shell nanocrystals (NCs of 3.2 and 5.2 nm in diameter with 5% size distribution) to efficiently convert incident UV radiation to visible emission,...

2004
Sang-Kee Eah Heinrich M. Jaeger Norbert F. Scherer Xiao-Min Lin Gary P. Wiederrecht

Femtosecond transient absorption spectroscopy is used to investigate hot electron dynamics of close-packed 6 nm gold nanocrystal monolayers. Morphology changes of the monolayer caused by the laser pump pulse are monitored by transmission electron microscopy. At low pump power, the monolayer maintains its structural integrity. Hot electrons induced by the pump pulse decay through electron–phonon...

Journal: :Physical review letters 2005
Fabien Silly Martin R Castell

Increasing interest in oxide supported nanoparticle science and technology is stimulating research into controlling nanocrystal shape. Pd forms nanocrystals on the surface of SrTiO3(001), and depending on the crystallographic interface of the Pd with the substrate three shapes can be created: truncated pyramids, huts, and hexagonal shaped disks. Scanning tunneling microscopy reveals that the na...

Journal: :Molecules 2017
Wei Kong Chau Fan Lam Feng Wang

Lanthanide-doped nanocrystals have shown great promise in bio-detection due to their outstanding luminescent properties, including large Stokes shift and sharp emission bands. Herein, we describe an in vitro detection of STAT3 by using an all-nanocrystal biosensing system that takes advantage of inter-particle energy transfer between two types of lanthanide-doped nanocrystals. We investigate th...

Journal: :Chemical communications 2005
Hui Meng Pei Kang Shen

Tungsten carbide nanocrystal modified Pt catalysts have been prepared by an intermittent microwave heating (IMH) method and show an improved activity for oxygen electroreduction in alkaline media.

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