A novel fluorescent array for mercury (II) ion in aqueous solution with functionalized cadmium selenide nanoclusters

Chen, Jinlong; Gao, Yingming; Xu, Zheng; Wu, Guangxin; Chen, Youcun; Zhu, Changqing

doi:10.1016/j.aca.2006.06.039

Cited by 189 publications

(90 citation statements)

References 38 publications

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“…24 One is dynamic quenching, which results from the collision between the fluorophore and a quencher, and the second one is static quenching, which results from the ground-state complex formation between the fluorophore and a quencher. According to studies on the mechanisms of fluorescence quenching of QDs and metal ions, [25][26][27] the above process can be attributed to effective electron transfer from the QDs to the Zn 2+ ions, and fluorescence recovery can be attributed to effective electron transfer from Zn 2+ ions to QDs after addition of adenosine, based on the strong affinity of zinc for nitrogen atoms, which correspondingly yields the nonradiative recombination of excited electrons (e -) in the conduction bands and holes (h + ) in the valence band on the surface of QDs. Figure 2A and B shows photographs of the photomask for the photoresist process for SU-8 molding and the fabricated PDMS microfluidic chip on the glass slide by using O 2 plasma, respectively.…”

Section: Resultsmentioning

confidence: 99%

Dopamine-functionalized InP/ZnS quantum dots as fluorescence probes for the detection of adenosine in microfluidic chip

An¹,

Ankireddy²,

Kim³

2015

IJN

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Microbeads are frequently used as solid supports for biomolecules such as proteins and nucleic acids in heterogeneous microfluidic assays. Chip-based, quantum dot (QD)-bead-biomolecule probes have been used for the detection of various types of DNA. In this study, we developed dopamine (DA)-functionalized InP/ZnS QDs (QDs-DA) as fluorescence probes for the detection of adenosine in microfluidic chips. The photoluminescence (PL) intensity of the QDs-DA is quenched by Zn 2+ because of the strong coordination interactions. In the presence of adenosine, Zn 2+ cations preferentially bind to adenosine, and the PL intensity of the QDs-DA is recovered. A polydimethylsiloxane-based microfluidic chip was fabricated, and adenosine detection was confirmed using QDs-DA probes.

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Section: Resultsmentioning

confidence: 99%

Dopamine-functionalized InP/ZnS quantum dots as fluorescence probes for the detection of adenosine in microfluidic chip

An¹,

Ankireddy²,

Kim³

2015

IJN

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“…The above mentioned sensing systems were all based on the fluorescence quenching of QDs by Hg 2+ . And the fluorescence quenching mechanism was based on electron transfer process between QDs surface ligands and Hg 2+ [68], or the quenching effect was explained by metal ion displacement between Cd 2+ and Hg 2+ on the QDs surface due to the higher binding affinity of Hg 2+ to S 2− , Se 2− or Te 2− [67,76,77].…”

Section: Reviewsmentioning

confidence: 99%

“…Nowadays, different Cd-chalcogenide QDs (CdS, CdSe, CdTe) coated with thiol-containing organic molecules such as L-cysteine (L-Cys), mercaptoacetic acid (MAA), mercaptopronionic acid (MPA), denatured bovine serum albumin (dBSA), cysteamine (CA) and thioglycolic acid (TGA) were synthesized and used as fluorescent probes to detect Hg 2+ [67][68][69][70][71][72]. Besides the commonly used Cd-chalcogenide QDs, their derivatives such as MAA-capped CdS/ ZnS core-shell QDs and QDs doped with rare earth ions (CdS:Eu QDs and CdS:Tb QDs capped with glutathione (GSH)) were also utilized for Hg 2+ analysis [73][74][75].…”

Section: Reviewsmentioning

confidence: 99%

Recent developments on nanomaterials-based optical sensors for Hg2+ detection

Duan

Zhan

2015

Sci. China Mater.

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Mercuric ion (Hg 2+ ), released from both natural and industrial sources, has severe adverse effects on human health and the environment even at very low concentrations. It is very important to develop a rapid and economical method for the detection of Hg 2+ with high sensitivity and selectivity. Nanomaterials with unique size and shape-dependent optical properties are attractive sensing materials. The application of nanomaterials to design optical sensors for Hg 2+ provides a powerful method for the trace detection of Hg 2+ in the environment, because these optical sensors are simple, rapidly responsive, cost-effective and highly sensitive. This review summarizes the recent advances on the development of optical assays for Hg 2+ in aqueous solution by using functionalized nanomaterials (including noble metal nanoparticles, fluorescent metal nanoclusters, semiconductor quantum dots and carbon nanodots). Detection strategies based on the Hg 2+ -induced changes in spectral absorbance, fluorescence intensity and surface-enhanced Raman scattering signals were described. And the design principles for each optical assay were presented. In addition, the future challenge and the prospect of the development of nanomaterial optical sensors for Hg 2+ detection were also discussed.

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“…Their long wavelength limits determined by the onset of lattice absorption are about 1.5 cm -1 at 24.3 µm [14] with a narrow impurity absorption centered at 18.5 um which varies from one crystal of CdSe to another. They also show a nonlinear optical behavior with pulses tunable from 10 to 20 µm [1]. Tellurium equally is a rare, silvery-white, brittle, lustrous metalloid that can burn in air with a greenishblue flame to form white tellurium dioxide (TeO2).…”

Section: Introductionmentioning

confidence: 99%

Studies on Cd1Se0.6Te0.4 Thin Films by Spectroscopic and Diffractometer Characterization

Mosiori

Oeba

2017

PoS

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Abstract. Cadmium selenide tellurium is a compound containing cadmium, tellurium and selenium elements forming a combined solid. Hall measurements suggest that it is an ntype semiconductor. Related optical studies indicate that is transparent to infra-red radiation. Structural studies clearly show that it has a wurtzite, sphalerite crystalline forms. Cadmium is a toxic heavy metal, and selenium is only toxic in large amounts or doses. By this toxicity, cadmium selenide is a known to be carcinogen to humans; however, this does not stop investigating it for optoelectronic applications. Current research has narrowed down to investigating cadmium selenide when in the form of nanoparticles. Cadmium selenide finds applications has found applications in opto-electronic devices like laser diodes, biomedical imaging, nano-sensing, high-efficiency solar cells and thin-film transistors. By chemical bath deposition, Cd 1 Se 0.6 Te 0.4 thin films were grown onto glass. Tellurium was gradually introduced as an impurity and its crystalline structure and optical properties were investigated by XRD and UV-VIS spectroscopy. The main Cd 1 Se 0.6 Te 0.4 /glass characteristics were correlated with the conditions of growing and postgrowth treatment and it was found out that films were homogeneous films with controllable thickness onto the glass substrate and suitable for n-type "sandwich" heterostructures applications. Comparison of the intensities of equivalent reflexions provided a test for the internal consistency of the measurements. Equivalent reflexions in two specimens differed on average by 1.4 % and 0.6% from the mean measured intensity, attesting to the high internal consistency of measurements from extended-face crystals. By comparison from data obtained from all samples showed their average deviation from the mean to be 0.9 %.

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A novel fluorescent array for mercury (II) ion in aqueous solution with functionalized cadmium selenide nanoclusters

Cited by 189 publications

References 38 publications

Dopamine-functionalized InP/ZnS quantum dots as fluorescence probes for the detection of adenosine in microfluidic chip

Dopamine-functionalized InP/ZnS quantum dots as fluorescence probes for the detection of adenosine in microfluidic chip

Recent developments on nanomaterials-based optical sensors for Hg2+ detection

Studies on Cd1Se0.6Te0.4 Thin Films by Spectroscopic and Diffractometer Characterization

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