Synthesis of highly fluorescent glutathione-capped ZnxHg1−xSe quantum dot and its application for sensing copper ion

Liu, Fang-Chen; Chen, Yiming; Lin, Jai-Ming; Tseng, Wei‐Lung

doi:10.1016/j.jcis.2009.05.044

Cited by 35 publications

(22 citation statements)

References 37 publications

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“…As a result, the obtained data fitted well into the first-order Stern-Volmer equation with the quenching constant (k) value of 8.7 × 10 −4 M −1 , which also strongly supported the proposed mechanism. 10 Detailed experimental descriptions for the mechanism study are provided in Supporting Information. Even though Hg belongs to the same group 12, the detection of the Hg 2+ ions with this system was excluded because the addition of Hg 2+ ions to the ZnS:Mn-MAA NC caused fast luminescence quenching.…”

Section: +mentioning

confidence: 99%

Application of the Water‐Dispersible ZnS:Mn Nanocrystal as an Effective and Convenient Photosensor Material for the Detection of Zn²⁺ and Cd²⁺ Ions in Aqueous Solution

Heo

Hwang

2015

Bulletin Korean Chem Soc

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The development of selective and sensitive sensors to detect heavy transition-metal ions in an aqueous environment is of great interest due to these ions' significant effects on the ecosystem and human health.1 In this regard, there has been research performed using semiconductor nanocrystals as fluorescence sensors for the detection of heavy transition-metal ions such as cadmium and mercury in water. 2,3 However, the most commonly used CdS and CdSe nanocrystals contain environmentally hazardous components. Therefore, development of a nanocrystal having no biological toxicity and high colloidal stability in water is needed for such applications. Previously, we have reported the synthesis and surface characterization of the water-dispersible mercaptoacetic acid (MAA)-capped ZnS:Mn nanocrystal. 4 In addition, more recently, significantly low biological toxicity and high colloidal stability of the ZnS:Mn-MAA nanocrystal (NC) have also been demonstrated. 5 In this article, we describe a novel application of the ZnS:Mn-MAA NC as a selective and convenient fluorescence sensor material to detect Zn 2+ and Cd 2+ ions in aqueous solution. The experimental details regarding the preparation and characterization of the obtained ZnS:Mn-MAA NC products are provided in Supporting Information.To study the surface-related properties of the ZnS:Mn-MAA NC, we measured the surface charge of the nanocrystal using an electrophoretic method. 6 The obtained zeta potential of the ZnS:Mn-MAA NC at ambient temperature was −22.38 mV, which was directly related to the pH condition of the nanocrystal preparation (pH = 10). The negatively charged nanocrystal surfaces were presumed to be suitable for further coordination by positively charged transition-metal ions such as Mn, and Cd 2+. As a result, fast luminescence quenching was observed by the addition of the aqueous solution containing most divalent transition-metal ions to that of ZnS:Mn-MAA NC, except for Zn 2+ and Cd 2+ions, as shown in Figure 1. Additionally, Figure 2(a) and (b) presents the photoluminescence (PL) emission spectra before and after addition of metal ions to the ZnS:Mn-MAA NC-containing solution, respectively. As can be seen in these spectra, the strong emission peaks from the ZnS:Mn-MAA NC remained only when Zn 2+ and Cd 2+ ions were added, while other metals caused almost complete fluorescence quenching. This unique result led us to preliminarily conclude that the ZnS:Mn-MAA NCs can be used as a selective metal ion photosensor for these two metal ions in water. The sensing limit of the concentration of the added molar concentration of the metal ions ([M]) was 2.50 μM over 1.0 mg/L of the ZnS: Mn-MAA NCs. There have been similar attempts to use the surface-modified ZnS:Mn NCs with other ligands for the detection of heavy transition-metal ions in aqueous solutions. 7,8 However, their fluorescence quenching effects were totally different from that of the ZnS:Mn-MAA NC.The most plausible explanation for our results is that the added metal ions were coordinated by the MAA l...

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Section: +mentioning

confidence: 99%

Application of the Water‐Dispersible ZnS:Mn Nanocrystal as an Effective and Convenient Photosensor Material for the Detection of Zn²⁺ and Cd²⁺ Ions in Aqueous Solution

Heo

Hwang

2015

Bulletin Korean Chem Soc

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“…K SV , calculated by linear regression of the plots, was 3.1 Â 10 6 M À 1 . A variety of processes can contribute to fluorescence quenching, including energy transfer, excited state reactions, complex formation, and collisional quenching [27][28][29][30][31]. The latter two processes are often referred to as static and dynamic quenching, respectively.…”

Section: Resultsmentioning

confidence: 99%

CdSe quantum dots decorated by mercaptosuccinic acid as fluorescence probe for Cu2+

Chen

Zhang

et al. 2011

Journal of Luminescence

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“…The emission also depends on the composition of the QDs. For example, in Zn x Hg 1–x Se QDs, the emission can be tuned by adjusting the composition to cover most of the visible and NIR region [194]. On top of the semiconductor core, a ZnS or CdS shell is usually deposited.…”

Section: Engineering Of Nanoparticles For Tumor Detectionmentioning

confidence: 99%

“…This makes the NIR region (650 nm to 900 nm) a relatively transparent spectrum window and ideal for in vivo fluorescence imaging [222]. Peng et al reported a one-pot synthesis of InAs/CdSe QDs with bright, stable, and narrow NIR photoluminescence [194]. Kelley’s group prepared NIR PbS QDs with a QY of ~26% [223].…”

Section: Engineering Of Nanoparticles For Tumor Detectionmentioning

confidence: 99%

Nanoparticles for improving cancer diagnosis

Chen

Zhen

Todd

et al. 2013

Materials Science and Engineering: R: Reports

105

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Despite the progress in developing new therapeutic modalities, cancer remains one of the leading diseases causing human mortality. This is mainly attributed to the inability to diagnose tumors in their early stage. By the time the tumor is confirmed, the cancer may have already metastasized, thereby making therapies challenging or even impossible. It is therefore crucial to develop new or to improve existing diagnostic tools to enable diagnosis of cancer in its early or even pre-syndrome stage. The emergence of nanotechnology has provided such a possibility. Unique physical and physiochemical properties allow nanoparticles to be utilized as tags with excellent sensitivity. When coupled with the appropriate targeting molecules, nanoparticle-based probes can interact with a biological system and sense biological changes on the molecular level with unprecedented accuracy. In the past several years, much progress has been made in applying nanotechnology to clinical imaging and diagnostics, and interdisciplinary efforts have made an impact on clinical cancer management. This article aims to review the progress in this exciting area with emphases on the preparation and engineering techniques that have been developed to assemble “smart” nanoprobes.

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Synthesis of highly fluorescent glutathione-capped ZnxHg1−xSe quantum dot and its application for sensing copper ion

Cited by 35 publications

References 37 publications

Application of the Water‐Dispersible ZnS:Mn Nanocrystal as an Effective and Convenient Photosensor Material for the Detection of Zn²⁺ and Cd²⁺ Ions in Aqueous Solution

Application of the Water‐Dispersible ZnS:Mn Nanocrystal as an Effective and Convenient Photosensor Material for the Detection of Zn²⁺ and Cd²⁺ Ions in Aqueous Solution

CdSe quantum dots decorated by mercaptosuccinic acid as fluorescence probe for Cu2+

Nanoparticles for improving cancer diagnosis

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Synthesis of highly fluorescent glutathione-capped ZnxHg1−xSe quantum dot and its application for sensing copper ion

Cited by 35 publications

References 37 publications

Application of the Water‐Dispersible ZnS:Mn Nanocrystal as an Effective and Convenient Photosensor Material for the Detection of Zn2+ and Cd2+ Ions in Aqueous Solution

Application of the Water‐Dispersible ZnS:Mn Nanocrystal as an Effective and Convenient Photosensor Material for the Detection of Zn2+ and Cd2+ Ions in Aqueous Solution

CdSe quantum dots decorated by mercaptosuccinic acid as fluorescence probe for Cu2+

Nanoparticles for improving cancer diagnosis

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Product

Resources

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Application of the Water‐Dispersible ZnS:Mn Nanocrystal as an Effective and Convenient Photosensor Material for the Detection of Zn²⁺ and Cd²⁺ Ions in Aqueous Solution

Application of the Water‐Dispersible ZnS:Mn Nanocrystal as an Effective and Convenient Photosensor Material for the Detection of Zn²⁺ and Cd²⁺ Ions in Aqueous Solution