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.

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.

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.

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

Preparation of Photoluminescent ZnSe/PAMAM Nanocomposites

2014 ◽  
Vol 1044-1045 ◽  
pp. 92-95
Author(s):  
Yu Juan Jin ◽  
Teng Zhang ◽  
Mu Nan Qiu ◽  
Ting Ting Zhao ◽  
Kai Li Jiang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Absorption Spectra ◽  
Emission Spectra ◽  
Pamam Dendrimers ◽  
Molar Ratio ◽  
Polyamidoamine Dendrimers ◽  
Pl Emission

Uniform and well-dispersed photoluminescent semiconductor ZnSe (zinc selenium) QDs (Quantum dots) were in-situ prepared stabilized by G4.0-NH3+PAMAM(polyamidoamine) dendrimers in methanol. The properties of ZnSe QDs encapsulated in PAMAM dendrimers were characterized by UV-Vis absorption spectra and photoluminescence (PL) emission spectra. The results were: ZnSe/PAMAM NCs (nanocomposites) with molar ratio 15 emitted strongest fluorescence.

scholarly journals Comparative Analysis of Proteins Regulated during Cadmium Sulfide Quantum Dots Response in Arabidopsis thaliana Wild Type and Tolerant Mutants

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 615
Author(s):  
Valentina Gallo ◽  
Andrea Zappettini ◽  
Marco Villani ◽  
Nelson Marmiroli ◽  
Marta Marmiroli
Keyword(s):  
Quantum Dots ◽  
Arabidopsis Thaliana ◽  
Comparative Analysis ◽  
Cadmium Sulfide ◽  
Chlorophyll Biosynthesis ◽  
Response To Treatment ◽  
Transcriptional Elongation ◽  
Wild Type ◽  
Abiotic Stress Response ◽  
Cds Qds

In previous work, two independent Arabidopsis thaliana Ac/Ds transposon insertional mutant lines, atnp01 and atnp02, were identified that showed a higher level of tolerance than the wild type (wt) line to cadmium sulfide quantum dots (CdS QDs). The tolerance response was characterized at physiological, genetic and transcriptomic levels. In this work, a comparative analysis was performed on protein extracts from plantlets of the two mutants and of wt, each treated with 80 mg L−1 CdS QDs. A comparative protein analysis was performed by 2D-PAGE, and proteins were characterized by MALDI-TOF/TOF mass spectrometry. Of 250 proteins identified from all three lines, 98 showed significant changes in relative abundance between control and CdS QD-treated plantlets. The wt, atnp01, and atnp02 control-treated pairs respectively showed 61, 31, and 31 proteins with differential expression. The two mutants had a different response to treatment in terms of type and quantity of up- and downregulated proteins. This difference became more striking when compared to wt. A network analysis of the proteins differentially expressed in atnp01 and atnp02 included several of those encoded by putative genes accommodating the transposons, which were responsible for regulation of some proteins identified in this study. These included nifu-like protein 3 (Nfu3), involved in chloroplast assembly, elongator complex 3 (Elo3), involved in transcriptional elongation, magnesium-chelate subunit-2 (Chli2), involved in chlorophyll biosynthesis, and protein phosphatase 2C (PP2C) which mediates abiotic stress response.

scholarly journals Surface Modified Chitosan with Cadmium Sulfide Quantum Dots as Luminescent Probe for Detection of Silver Ions

2021 ◽  
Vol 33 (5) ◽  
pp. 1025-1030
Author(s):  
Chella Santhosh ◽  
R.S. Ernest Ravindran
Keyword(s):  
Quantum Dots ◽  
Cadmium Sulfide ◽  
Silver Ions ◽  
Aqueous Solubility ◽  
X Ray Diffraction ◽  
Modified Chitosan ◽  
Transmission Electron ◽  
Cds Qds ◽  
Surface Modified ◽  
Chitosan Composite

In present work, the surface modified cadmium sulfide quantum dots (CdS QDs) was synthesized with chitosan for the detection of silver ions. Chitosan was employed as matrix medium to fabricate CdS QDs, resulting in the formation of novel QDs/chitosan composite. The CdS quantum dots surface coated with chitosan were analyzed using UV-vis spectrophotometer, X-ray diffraction and transmission electron microscope. The chitosan + CdS QDs exhibited high aqueous solubility with better steadiness. By using chitosan + CdS, the silver ions were not only detected but also reduced to nanosize due to the reducing property of chitosan. The mechanism of fluorescence quenching of chitosan + CdS by Ag+ was investigated using photoluminescence spectroscopy.

Cadmium sulfide quantum dots anchored on reduced graphene oxide for the electrochemical detection of metronidazole

2021 ◽  
Vol 45 (6) ◽  
pp. 3022-3033
Author(s):  
Praveen Kumar Gopi ◽  
Ganesh Kesavan ◽  
Shen-Ming Chen ◽  
Chandan Hunsur Ravikumar
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Cadmium Sulfide ◽  
Reduced Graphene Oxide ◽  
Electrochemical Detection ◽  
Reduced Graphene ◽  
Metal Organic ◽  
Cds Qds

In this research, the metal–organic-based synthesis of cadmium sulfide quantum dots (CdS QDs) was performed.

scholarly journals Time and Temperature Dependence of CdS Nanoparticles Grown in a Polystyrene Matrix

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
F. Antolini ◽  
E. Burresi ◽  
L. Stroea ◽  
V. Morandi ◽  
L. Ortolani ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Growth Process ◽  
General Trend ◽  
Cds Nanoparticles ◽  
Size Dependent ◽  
Cds Nanocrystals ◽  
Polystyrene Matrix ◽  
Morphology And Structure ◽  
Cds Qds

Luminescent CdS nanocrystals embedded in a polystyrene matrix were successfully prepared. Thein situgrowth of CdS QDs was realized by thermal treatment of Cd bis(thiolate)/polymer foil at different times and temperatures (240°Cand300°C) of annealing, in order to evaluate their influence on the quantum dots growth process. As a general trend, the increasing of time and temperature of annealing induces a rise of the CdS nanocrystals size into the polymeric matrix. The size distribution, morphology, and structure of the CdS nanoparticles were analysed with HRTEM and XRD experiments. UV-Vis and PL data are strongly size-dependent and were used to investigate the particles' growth process, too. The CdS nanoparticles behavior in solution indicated a general trend of QDs to aggregation. This predisposition was clearly displayed by DLS measurements.

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