Facile synthesis of water-soluble and size-homogeneous cadmium selenide nanoparticles and their application as a long-wavelength fluorescent probe for detection of Hg(II) in aqueous solution

Inorganic/organic hybrid light-emitting diodes were easily fabricated with a thin film containing water-soluble cadmium selenide nanocrystals and poly(N-vinylcarbazole) as an emitting layer by a spin-coating method. The cadmium selenide nanocrystals were synthesized in aqueous solution with L-cysteine hydrochloride as the stabilizer and were transferred from the aqueous solution into chloroform by a cationic surfactant cetyltrimethyl ammonium bromide. A broad emission spanning the whole visible wavelength range was obtained from the inorganic/organic hybrid devices whether poly(N-vinylcarbazole) was present in the devices or not, and the electroluminescence intensity of the devices increased as the applied voltages increased. However, an obvious blue-shift of the wave-length was observed with the increasing applied voltages in the device with poly(N-vinylcarbazole). Accordingly, the emission color of the device made with poly(N-vinylcarbazole) could be tuned from white to blue by varying the applied voltages, but the emission color of the device made without poly(N-vinylcarbazole) was almost constrained in the white region. This can be attributed to a limited contribution of poly(N-vinylcarbazole) emission to the electroluminescence spectra under the higher applied voltage. By comparing the electroluminescence intensity and the current–voltage characteristics of the devices made with and without poly(N-vinylcarbazole), the performance of the device with poly(N-vinylcarbazole) was improved greatly, which indicated that poly(N-vinylcarbazole) played an important role in the carrier injection and transportation in the device with poly(N-vinylcarbazole).

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Synthesis of novel quantum dots from DNA under mild conditions and their use as a fluorescent probe for the detection of Fe3+ and in biological imaging

Analytical Methods ◽

10.1039/c5ay01151e ◽

2015 ◽

Vol 7 (15) ◽

pp. 6274-6279 ◽

Cited By ~ 7

Author(s):

Guifang Cheng ◽

Weibo Zhang ◽

Ying Zhou ◽

Qifeng Ge ◽

Chaobiao Huang

Keyword(s):

Aqueous Solution ◽

Quantum Dots ◽

Fluorescent Probe ◽

Biological Imaging ◽

Water Soluble ◽

Iron Ions ◽

Simple Method ◽

Mild Conditions

We have demonstrated a simple method for the synthesis of water-soluble and well-dispersed fluorescent DNA-dots under mild conditions, which could be used as an effective fluorescent probe for the detection of iron ions with relatively good selectivity and sensitivity in an aqueous solution as well as in biological imaging applications.

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A novel one-pot route for the synthesis of water-soluble cadmium selenide nanoparticles

Journal of Crystal Growth ◽

10.1016/j.jcrysgro.2008.03.032 ◽

2008 ◽

Vol 310 (13) ◽

pp. 3230-3234 ◽

Cited By ~ 45

Author(s):

S.O. Oluwafemi ◽

N. Revaprasadu ◽

A.J. Ramirez

Keyword(s):

Cadmium Selenide ◽

Water Soluble ◽

One Pot ◽

Cadmium Selenide Nanoparticles

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Selective and Sensitive Detection of Cyanide Based on the Displacement Strategy Using a Water-Soluble Fluorescent Probe

Journal of Analytical Methods in Chemistry ◽

10.1155/2016/1462013 ◽

2016 ◽

Vol 2016 ◽

pp. 1-6 ◽

Cited By ~ 8

Author(s):

Ming La ◽

Yuanqiang Hao ◽

Zhaoyang Wang ◽

Guo-Cheng Han ◽

Lingbo Qu

Keyword(s):

Aqueous Solution ◽

Fluorescent Probe ◽

Limit Of Detection ◽

Aqueous Media ◽

Water Soluble ◽

World Health ◽

Selective Detection ◽

Highly Sensitive ◽

Health Organization

A water-soluble fluorescent probe (C-GGH) was used for the highly sensitive and selective detection of cyanide (CN−) in aqueous media based on the displacement strategy. Due to the presence of the recognition unit GGH (Gly-Gly-His), the probeC-GGH can coordinate with Cu2+and consequently display ON-OFF type fluorescence response. Furthermore, thein situformed nonfluorescentC-GGH-Cu2+complex can act as an effective OFF-ON type fluorescent probe for sensing CN−anion. Due to the strong binding affinity of CN−to Cu2+, CN−can extract Cu2+fromC-GGH-Cu2+complex, leading to the release ofC-GGH and the recovery of fluorescent emission of the system. The probeC-GGH-Cu2+allowed detection of CN−in aqueous solution with a LOD (limit of detection) of 0.017 μmol/L which is much lower than the maximum contaminant level (1.9 μmol/L) for CN−in drinking water set by the WHO (World Health Organization). The probe also displayed excellent specificity for CN−towards other anions, including F−, Cl−, Br−, I−, SCN−,PO43-,N3-,NO3-, AcO−,SO42-, andCO32-.

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