Monitoring pyrophosphate anions via cobalt(ii)-modulated fluorescence of cadmium sulfide quantum dots

2016 ◽  
Vol 8 (10) ◽  
pp. 2170-2175 ◽  
Author(s):  
Jin-Xia Liu ◽  
Shou-Nian Ding
Keyword(s):  
Quantum Dots ◽  
Fluorescence Quenching ◽  
Cadmium Sulfide ◽  
Fluorescent Sensor ◽  
Fluorescence Recovery ◽  
Turn On ◽  
Modulated Fluorescence ◽  
Cds Qds

An off–on fluorescent sensor for pyrophosphate (PPi) is established based on the fluorescence quenching of CdS QDs in the presence of Co2+(turn-off) and the fluorescence recovery (turn-on) by the continuous addition of PPi.

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.

A Mn:ZnSe quantum dot-based turn-on fluorescent sensor for the highly selective and sensitive detection of Cd2+

2020 ◽  
Vol 12 (4) ◽  
pp. 552-556 ◽  
Author(s):  
Zhi-Qiang Zhou ◽  
Li-Yun Yang ◽  
Yuan-Ping Liao ◽  
Hui-Yan Wu ◽  
Xiao-Hui Zhou ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Fluorescent Sensor ◽  
Sensitive Detection ◽  
Sensing Properties ◽  
Turn On ◽  
Fluorescence Turn On

A highly selective and sensitive nanoprobe with fluorescence turn-on sensing properties for recognizing Cd2+ was developed through replacing Mn2+ near the surface of Mn:ZnSe quantum dots.

Simple strategy to enhance the sensitivity of fluorescent sensor-based CdS quantum dots by a surfactant for Hg2+ detection

2021 ◽  
Author(s):  
Pradthana Sianglam ◽  
Kessarin Ngamdee ◽  
Phattananawee Nalaoh ◽  
Vinich Promarak ◽  
Andrew J. Hunt ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Fluorescent Sensor ◽  
Detection Sensitivity ◽  
Cds Quantum Dots ◽  
Mercury Ions ◽  
Simple Strategy ◽  
Cds Qds

A simple strategy to enhance the detection sensitivity of fluorescent sensor-based CdS quantum dots (CdS QDs) for the detection of mercury ions (Hg2+) was demonstrated. L-Cysteine-capped CdS QDs (L-Cyst-CdS QDs)...

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.

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

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.

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.

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