نتایج جستجو برای: zns shell

تعداد نتایج: 54707  

Journal: :The journal of physical chemistry. C, Nanomaterials and interfaces 2007
Yu-San Liu Yinghua Sun P Thomas Vernier Chi-Hui Liang Suet Ying Christin Chong Martin A Gundersen

The photoluminescence of mercaptoacetic acid (MAA)-capped CdSe/ZnSe/ZnS semiconductor nanocrystal quantum dots (QDs) in SKOV-3 human ovarian cancer cells is pH-dependent, suggesting applications in which QDs serve as intracellular pH sensors. In both fixed and living cells the fluorescence intensity of intracellular MAA-capped QDs (MAA QDs) increases monotonically with increasing pH. The electr...

2013
Lingling Li Ying Chen Qian Lu Jing Ji Yuanyuan Shen Mi Xu Rong Fei Guohai Yang Kui Zhang Jian-Rong Zhang Jun-Jie Zhu

The marriage of energy transfer with electrochemiluminescence has produced a new technology named electrochemiluminescence energy transfer (ECL-ET), which can realize effective and sensitive detection of biomolecules. To obtain optimal ECL-ET efficiency, perfect energy overlapped donor/acceptor pair is of great importance. Herein, we present a sensitive ECL-ET based immunosensor for the detecti...

2011
Ryan Gresback Ryan Hue Wayne L Gladfelter Uwe R Kortshagen

Indium phosphide nanocrystals (InP NCs) with diameters ranging from 2 to 5 nm were synthesized with a scalable, flow-through, nonthermal plasma process at a rate ranging from 10 to 40 mg/h. The NC size is controlled through the plasma operating parameters, with the residence time of the gas in the plasma region strongly influencing the NC size. The NC size distribution is narrow with the standa...

Journal: :Chemphyschem : a European journal of chemical physics and physical chemistry 2001
S Haubold M Haase A Kornowski H Weller

The wide-bandgap semiconducting material, zinc sulfide, has been coated on indium phosphide nanoclusters to a 1-2-Å thickness. The resulting InP-ZnS core-shell particle (as shown in the TEM image; scale 1 cm=5 nm) exhibits bright luminescence at room temperature with quantum efficiencies as high as 23 %.

Journal: :Optics express 2007
Ibrahim M Soganci Sedat Nizamoglu Evren Mutlugun Onur Akin Hilmi V Demir

Using metallic nanoislands, we demonstrate the localized plasmonic control and modification of the spontaneous emission from closely-packed nanocrystal emitters, leading to significant changes in their collective emission characteristics tuned spectrally and spatially by plasmon coupling. Using randomly-distributed silver nanoislands, we show that the emission linewidth of proximal CdSe/ZnS cor...

Journal: :ACS Applied Materials & Interfaces 2021

It is a generally accepted perspective that type-II nanocrystal quantum dots (QDs) have low yield due to the separation of electron and hole wavefunctions. Recently, high levels were reported for cadmium-based QDs. Hence, quest finding non-toxic efficient QDs continuing. Herein, we demonstrate environmentally benign InP/ZnO/ZnS core/shell/shell reach ∼91%. For this, ZnO layer was grown on core ...

2007
Giovanni Morello Marco Anni PantaleoDavide Cozzoli Liberato Manna Roberto Cingolani Milena De Giorgi

Time Resolved Photoluminescence (TRPL) measurements on the picosecond time scale (temporal resolution of 17 ps) on colloidal CdSe and CdSe/ZnS Quantum Dots (QDs) were performed. Transient PL spectra reveal three emission peaks with different lifetimes (60 ps, 460 ps and 9–10 ns, from the bluest to the reddest peak). By considering the characteristic decay times and by comparing the energetic se...

Journal: :Journal of nanoscience and nanotechnology 2009
Chih-Wen Lee Sheng-Hsiung Yang Chain-Shu Hsu Hsin-Fei Meng

In this study, we report the fabrication and characterization of organic/inorganic hybrid polymer light emitting diodes (PLEDs) made with ZnS-capped CdSe core/shell type nanocrystals and a light-emitting polymer poly[2-phenyl-3-(9,9-dihexylfluoren-2-yl)-1,4-phenylene vinylene]-co-[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylene vinylene]. The device using pristine polymer as active layer emitted y...

Journal: :ACS applied materials & interfaces 2014
Azar Sadollahkhani Amir Hatamie Omer Nur Magnus Willander Behrooz Zargar Iraj Kazeminezhad

In this study, we have proposed a new nanoparticle-containing test paper sensor that could be used as an inexpensive, easy-to-use, portable, and highly selective sensor to detect Cu(2+) ions in aqueous solutions. This disposable paper sensor is based on ZnO@ZnS core-shell nanoparticles. The core-shell nanoparticles were synthesized using a chemical method and then they were used for coating the...

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