Cu2+-modulated cysteamine-capped CdS quantum dots as a turn-on fluorescence sensor for cyanide recognition

Noipa, Tuanjai; Tuntulani, Thawatchai; Ngeontae, Wittaya

doi:10.1016/j.talanta.2012.10.052

Cited by 46 publications

(23 citation statements)

References 46 publications

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“…16,17 Another possibility of the emission quenching for the ZnS:Mn NCs with nitrite ions can be an inner-filter effect 18 that nitrite ions directly absorb the emission light from the NCs. A similar pathway of detection for cyanide ion using CdS NCs has been reported by Noipa et al 24 However, the CdS NCs did not showed the emission quenching for nitrite ions in the same condition. Therefore, the innerfilter quenching effect can be also excluded from the description of the emission quenching pathway for the ZnS: Mn-GA NCs with the nitrite ions.…”

supporting

confidence: 82%

Application of the Manganese (II) Ion Doped Zinc Sulfide Nanocrystals for Dual Detection of Cyanide and Nitrite Ions in Aqueous Solution

Sim

Hwang

2017

Bulletin Korean Chem Soc

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Transition metal ion doped zinc sulfide nanocrystals (NCs) are one of the hottest subjects in the semiconductor nanomaterials research area. 1-3 These materials have been widely used in various electronic sophisticated devices since they exhibit optimal physical and chemical properties for these applications. [4][5][6][7] In this article, we described the synthesis of the water-dispersible and positively surface charged ZnS:Mn NCs by using glycolic acid (GA) as a polar surface capping agent at low pH condition. In addition, the prepared NCs were evaluated as a photo-sensor for the detection of specific anion species in water. Particularly, the selected GA molecule has two different polar functional groups: hydroxyl (−OH) and carboxyl (−COOH) groups, which can simultaneously coordinate to the ZnS: Mn-GA NCs and the detecting ions. The synthetic condition was adjusted to low pH to impart positive charges to the surface of the NCs by protonation of the functional end groups. Additionally, to investigate the surfaces properties of the ZnS:Mn-GA NCs, the surface charge and the degree of aggregation in aqueous solution were measured, which are critical factors of the NCs for practical applications for sensors or catalysts. The detailed characterization works for the NC products were described in Appendix S1, Supporting Information. The main purpose of this study is to estimate the potential of the ZnS:Mn-GA NCs as a specific anion photo-sensor in water.The positively charged ZnS:Mn-GA NCs were tested as photo-chemical sensors for various anions with various oxidation states by further addition of:sulfate (SO 4 2− ), sulfide (S 2− ), and citrate (C 6 H 5 O 7 3− ) ions to the NCs at ambient temperature. The fluorescence images presented in Figure 1(a) were obtained from the ZnS:Mn-GA NCs upon addition of various anions, which were taken using He-Cd laser (λ max = 325 nm) as a light source, and Figure 1(b) presents histograms showing the actual changes in photoluminescence intensity upon the addition of the corresponding anions compared with the original ZnS:Mn-GA NCs (blank) solution. Figure 1 (b) shows that the intensities of the emission peaks for the ZnS:Mn-GA NCs were not much changed by the addition of most anions, while NO 2 − ions caused significant emission quenching (95%) compared to the blank sample (NCs only). Moreover, the Figure 1(a) obviously shows that the color of the emission light from the ZnS:Mn-GA NCs was completely changed (from yellow-orange to purple-blue) after addition of CN − ions. Based on these unique and interesting results, we preliminarily concluded that the ZnS:Mn-GA NCs can be used as effective anion photo-sensors for the simultaneous detection of NO 2 − and CN − ions in water. Both of the Figure 1(a) and (b) were obtained by adjusting the molar concentrations of the added anions at 50.0 μM over 10.0 mg/L of the ZnS:Mn-GA NCs. In addition, the measured limit of detection (LOD) for the added molar concentration of nitrite ion [NO 2 − ] was 1.0 μM over 10.0 mg/L of the ZnS:Mn-GA NCs in this...

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supporting

confidence: 82%

Application of the Manganese (II) Ion Doped Zinc Sulfide Nanocrystals for Dual Detection of Cyanide and Nitrite Ions in Aqueous Solution

Sim

Hwang

2017

Bulletin Korean Chem Soc

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“…It was reported that Cu 2+ can adsorb to the surface of cysteamine capped CdS quantum dots and quench its fluorescence. 39 To verify the Cu 2+ sensing mechanism, the aggregation measurements of Cyta-AuNPs were performed transmission electron microscopy (TEM) technique. It was distinctly observed that the aggregation degree of Cyta-AuNPs evidently increased upon adding Cu 2+ to the Cyta-AuNPs solution (Fig.…”

Section: Results and Discussion Synthesis And Characterization Of Cytmentioning

confidence: 99%

Highly Selective Colorimetric Detection of Copper Ions Using Cysteamine Functionalized Gold Nanoparticles

Li¹,

Yuan²,

Xin-kai³

et al. 2014

J Chinese Chemical Soc

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In this study, we designed a system of integrating gold nanoparticles and cysteamine to detect Cu 2+ based on a colorimetric strategy. The quantified limit of detection towards Cu 2+ is 0.4 mM, which is~50 times lower than the maximum contamination level (~20 mM) in drinking water permitted by US environmental protection agency. The practicality of this system was further validated by detecting Cu 2+ in different water samples.

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“…Water-soluble TGAmodified CdTe QDs were synthesized according to the reported method. 42 To form the cadmium precursor, 68.4 mg of 2CdCl 2 ·5H 2 O, 63 μL of TGA, and 75 mL of highly purified water were mixed in a three-necked flask. The mixture was adjusted to pH 9−9.2 with 1.0 M NaOH and stirred under N 2 for 20 min.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Quantum Dot-Based Molecularly Imprinted Polymers on Three-Dimensional Origami Paper Microfluidic Chip for Fluorescence Detection of Phycocyanin

Zhang

et al. 2017

ACS Sens.

132

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In this work, we developed a novel strategy using fluorescent quantum dots (QDs) combined with molecularly imprinted polymers (MIPs) on three-dimensional (3D) origami paper-based microfluidic devices for specific recognition and sensitive detection of phycocyanin. This method can realize the liquid phase of QDs@MIPs being transferred to the solid-phase paper base and achieve easy portability for the analysis. Under optimal conditions, we successfully demonstrated the proposed paper@QDs@MIPs 3D microfluidic chip for the sensitive and selective detection of phycocyanin protein target in a simple and robust manner. Our results revealed that the method exhibited a dynamic response to phycocyanin in the range of 10−50 mg/L with a limit of detection of 2 mg/L. Importantly, this device could provide quantitative information very conveniently and show great potential to be further extended to the detection of other proteins or biomarkers for environmental and food safety research. KEYWORDS: paper-based microfluidic devices, molecularly imprinted polymers (MIPs), quantum dot, phycocyanin, fluorescence P hycocyanin, a blue-colored photosynthetic accessory pigment protein, is widely distributed in seawater, lake water, and algae microbes in drinking water, and has good survival ability. In addition, phycocyanin is a new desirable fluorescent marker with high stability and sensitivity and could be applied in biomedical and environmental fields. In the case of eutrophication of the water environment it often leads to algae bloom, causing serious deterioration of water quality. 1−3 The content of toxic substances produced by blue-green algae, including β-methylamino-alanine, 4 algal toxins, 5 nodularin, 6 and saxitoxin, 2,7,8 in the water is also increased and represents a serious threat to the safety of marine life and humans. Therefore, to protect the ecological balance of the environment, it is necessary to monitor and control the quantity of cyanobacteria. As its concentration can effectively represent cyanobacterial biomass, it can be used as an index of cyanobacteria outbreak and plays an important role in monitoring the marine ecological environment. 9 Current methods of detecting phycocyanin concentration mainly involve remote sensing methods, 10,11 UV, and fluorescence detection. 12,13 In addition, direct analysis of the water content of phycocyanin often requires separation and purification steps. Moreover, high cost and time-consuming methods add to the challenge, and development of a low-cost, fast, and efficient method for the detection of phycocyanin is urgently needed.Since the concept of microfluidic paper-based analytical devices (μPADs) was first proposed by the Whitesides group, 14 versatile μPADs have recently attracted increasing atten-

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Cu2+-modulated cysteamine-capped CdS quantum dots as a turn-on fluorescence sensor for cyanide recognition

Cited by 46 publications

References 46 publications

Application of the Manganese (II) Ion Doped Zinc Sulfide Nanocrystals for Dual Detection of Cyanide and Nitrite Ions in Aqueous Solution

Application of the Manganese (II) Ion Doped Zinc Sulfide Nanocrystals for Dual Detection of Cyanide and Nitrite Ions in Aqueous Solution

Highly Selective Colorimetric Detection of Copper Ions Using Cysteamine Functionalized Gold Nanoparticles

Quantum Dot-Based Molecularly Imprinted Polymers on Three-Dimensional Origami Paper Microfluidic Chip for Fluorescence Detection of Phycocyanin

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