In situ functionalization of self-assembled dendrimer nanofibers with cadmium sulfide quantum dots through simple ionic-substitution

2016 ◽  
Vol 40 (7) ◽  
pp. 6325-6331 ◽  
Author(s):  
V. Astachov ◽  
M. Garzoni ◽  
A. Danani ◽  
K.-L. Choy ◽  
G. M. Pavan ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cadmium Sulfide ◽  
Simple Approach ◽  
Ionic Substitution ◽  
Cds Qds ◽  
Self Assembled ◽  
Poly Propylene ◽  
In Situ Functionalization

Cadmium sulfide quantum dots (CdS-QDs) can be generated along poly(propylene imine) (PPI) dendrimer-based self-assembled nanofibers through a simple approach based on ionic substitution.

Aged Fingermarks Detection with CdS/PAMAM Nanocomposites

2011 ◽  
Vol 282-283 ◽  
pp. 466-469 ◽  
Author(s):  
Yu Juan Jin ◽  
Yun Jun Luo ◽  
Guo Zhi Xu ◽  
Biao Yang
Keyword(s):  
Quantum Dots ◽  
Cadmium Sulfide ◽  
Pamam Dendrimers ◽  
Adhesive Tape ◽  
Yellow Luminescence ◽  
Ultraviolet Excitation ◽  
Nano Scale ◽  
Powder Suspension ◽  
Cds Qds

CdS(Cadmium sulfide)/PAMAM(polyamidoamine) Nanocomposites were in-situ prepared taking PAMAM dendrimers as stabilization in water. The prepared solution containing photoluminescent semiconductor CdS QDs(Quantum dots) was utilized for detection of aged fingermarks on adhesive tape strips. The fingermarks were aged for 1 d, 7 d and 30 d in nature light respectively. The results show that the latent aged fingermarks treated with CdS/PAMAM nanocomposites emit yellow luminescence under ultraviolet excitation of 365 nm in the dark. Aged fingermarks were detected successfully with better resolving rate comparing with existing nano-scale commercial TiO2powder suspension.

Self-assembled quantum dots and nanoholes by molecular beam epitaxial growth and atomically precise in situ etching

2002 ◽  
Vol 722 ◽  
Author(s):  
S. Kiravittaya ◽  
R. Songmuang ◽  
O. G. Schmidt
Keyword(s):  
Quantum Dots ◽  
Molecular Beam ◽  
Flat Surface ◽  
Local Strain ◽  
Growth Conditions ◽  
Etching Depth ◽  
Molecular Beam Epitaxial ◽  
Self Assembled ◽  
Molecular Beam Epitaxial Growth

AbstractEnsembles of homogeneous self-assembled quantum dots (QDs) and nanoholes are fabricated using molecular beam epitaxy in combination with atomically precise in situ etching. Self-assembled InAs QDs with height fluctuations of ±5% were grown using a very low indium growth rate on GaAs (001) substrate. If these dots are capped with GaAs at low temperature, strong room temperature emission at 1.3 νm with a linewidth of 21 meV from the islands is observed. Subsequently, we fabricate homogeneous arrays of nanoholes by in situ etching the GaAs surface of the capped InAs QDs with AsBr3. The depths of the nanoholes can be tuned over a range of 1-6 nm depending on the nominal etching depth and the initial capping layer thickness. We appoint the formation of nanoholes to a pronounced selectivity of the AsBr3 to local strain fields. The holes can be filled with InAs again such that an atomically flat surface is recovered. QDs in the second layer preferentially form at those sites, where the holes were initially created. Growth conditions for the second InAs layer can be chosen in such a way that lateral QD molecules form on a flat surface.

scholarly journals Fluorescence modulation of cadmium sulfide quantum dots by azobenzene photochromic switches

2016 ◽  
Vol 472 (2186) ◽  
pp. 20150692 ◽  
Author(s):  
Hina Javed ◽  
Kalsoom Fatima ◽  
Zareen Akhter ◽  
Muhammad Arif Nadeem ◽  
Muhammad Siddiq ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cadmium Sulfide ◽  
Mercaptoacetic Acid ◽  
X Ray Diffraction ◽  
Photochromic Compounds ◽  
Lowest Unoccupied Molecular Orbital ◽  
Modified Surface ◽  
Fluorescence Modulation ◽  
Cds Qds ◽  
Surface Modified

We have investigated the attachment of azobenzene photochromic switches on the modified surface of cadmium sulfide (CdS) quantum dots (QDs). The modification of CdS QDs is done by varying the concentration of the capping agent (mercaptoacetic acid) and NH 3 in order to control the size of the QDs. The X-ray diffraction studies revealed that the crystallite size of CdS QDs ranged from 6 to 10 nm. The azobenzene photochromic derivatives bis(4-hydroxybenzene-1-azo)4,4′(1,1′ diphenylmethane) (I) and 4,4′-diazenyldibenzoic acid (II) were synthesized and attached with surface-modified CdS QDs to make fluorophore–photochrome CdS-(I) and CdS-(II) dyad assemblies. Upon UV irradiation, the photochromic compounds (I) and (II) undergo a reversible trans – cis isomerization. The photo-induced trans – cis transformation helps to transfer photo-excited electrons from the conduction band of the CdS QDs to the lowest unoccupied molecular orbital of cis isomer of photochromic compounds (I) and (II). As a result, the fluorescence of CdS-(I) and CdS-(II) dyads is suppressed approximately five times compared to bare CdS QDs. The fluorescence modulation in such systems could help to design luminescent probes for bioimaging applications.

Self-assembled CdS quantum dots in carbon nanotubes: induced polysulfide trapping and redox kinetics enhancement for improved lithium–sulfur battery performance

2019 ◽  
Vol 7 (2) ◽  
pp. 806-815 ◽  
Author(s):  
Dong Cai ◽  
Lili Wang ◽  
La Li ◽  
Yupu Zhang ◽  
Junzhi Li ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Quantum Dots ◽  
Rate Performance ◽  
Cds Quantum Dots ◽  
Redox Kinetics ◽  
Lithium Sulfur Batteries ◽  
Cds Qds ◽  
Self Assembled ◽  
Sulfur Battery ◽  
Lithium Sulfur

Self-assembled CdS-QDs in carbon nanotubes are highly efficient cathode materials for lithium–sulfur batteries with improved rate performance and cycle life. The configuration suppresses polysulfide shuttling and enhances redox kinetics.

scholarly journals In situ accurate control of 2D-3D transition parameters for growth of low-density InAs/GaAs self-assembled quantum dots

2013 ◽  
Vol 8 (1) ◽  
Author(s):  
Mi-Feng Li ◽  
Ying Yu ◽  
Ji-Fang He ◽  
Li-Juan Wang ◽  
Yan Zhu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Low Density ◽  
Self Assembled

scholarly journals Mediator-free biosensor using chitosan capped CdS quantum dots for detection of total cholesterol

RSC Advances ◽  
2015 ◽  
Vol 5 (57) ◽  
pp. 45928-45934 ◽  
Author(s):  
Hemant Dhyani ◽  
Md. Azahar Ali ◽  
Satyendra P. Pal ◽  
Saurabh Srivastava ◽  
Pratima R. Solanki ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Total Cholesterol ◽  
Cadmium Sulfide ◽  
Surface Functionalization ◽  
Cholesterol Oxidase ◽  
Cholesterol Esterase ◽  
Cds Quantum Dots ◽  
Oxidase Enzyme ◽  
Enzyme Molecules

An electrochemical mediator-free biosensor platform have been fabricated using in situ synthesized cadmium sulfide quantum dots embedded in chitosan via surface functionalization of cholesterol esterase and cholesterol oxidase enzyme molecules.

Biochemical and behavioural responses of the marine polychaete Hediste diversicolor to cadmium sulfide quantum dots (CdS QDs): Waterborne and dietary exposure

Chemosphere ◽  
2014 ◽  
Vol 100 ◽  
pp. 63-70 ◽  
Author(s):  
Pierre-Emmanuel Buffet ◽  
Laurence Poirier ◽  
Aurore Zalouk-Vergnoux ◽  
Christelle Lopes ◽  
Jean-Claude Amiard ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cadmium Sulfide ◽  
Dietary Exposure ◽  
Hediste Diversicolor ◽  
Behavioural Responses ◽  
Marine Polychaete ◽  
Cds Qds
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