Metal ions optical sensing by semiconductor quantum dots

Lou, Yongbing; Zhao, Yixin; Chen, Jinxi; Zhu, Jun‐Jie

doi:10.1039/c3tc31937g

Cited by 176 publications

(103 citation statements)

References 208 publications

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“…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.…”

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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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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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“…To overcome this challenge , several strategies such as using elevated reaction temperature, controlling the crystallinity of the initial PbI 2 film, or using MAI vapor instead of MAI IPA solution have been developed. [23][24][25] Porous PbI 2 could be an ideal candidate for fast two-step deposition of perovskite films. The first reported porous PbI 2 backbone for sequential deposition was realized by using MACl additive.…”

Section: Additives For Pbi 2 In Two-step Methodsmentioning

confidence: 99%

Additive-Assisted Controllable Growth of Perovskites

Zhao

Zhu

2017

Series on Chemistry, Energy and the Environment

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“…Different sensor materials ,for example, natural fluorescent a n d c o l o u r r e s p o n s i bl e f u n c t i o n a l gr o u p compounds [82][83][84] , organic conjugated macromolecule substances 85,86 ,metal nanoparticles [87][88][89] , biopolymers of nucleotides and aminoacids [90][91][92][93] 97 ,latelyestimated a very specific discovery of methyl-mercury cation in fish tests using Ag 0 /Hg 0 amalgamation. In a while, optical detecting of the metal particle was accounted for by Zhe and colleagues 98 ,in the light of semiconductor quantum dots. The writers outlined the thought to make water solvent quantum dots is to trade the local natural ligands topped on the quantum dots surface with other dissolvable ligands utilizing peripheral charge and nonpolar cooperations.…”

Section: Detection Of Mercurymentioning

confidence: 99%

Fabrication of Anchored Complexes as Electrodes for Sensing Heavy Metal Ions by Electrochemical Method

Jose¹,

Datta²,

Sreeja³

2017

Orient. J. Chem

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Anchored coordination complexes as electrochemical sensors play a significant role in the modern era. It is evident that this becomes a fact on account of their practical convenience. Furthermore, they have unlimited scope in ecological, therapeutic, experimental and biomedical applications. It has been observed that 165 such papers have reported on anchored complexes for electrochemical sensing during the past two years. While human vitality is rigorously threatened by heavy metal ions today, numerous trials are restrained for screening these in nature. This retrace highlights the electro analytical methods and the masterpiece contribution of anchored coordination complexes as electrochemical sensors for the identification of heavy metals such as indium, uranium, lead, beryllium, and mercury in 2015 and 2016.

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Metal ions optical sensing by semiconductor quantum dots

Cited by 176 publications

References 208 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

Additive-Assisted Controllable Growth of Perovskites

Fabrication of Anchored Complexes as Electrodes for Sensing Heavy Metal Ions by Electrochemical Method

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Metal ions optical sensing by semiconductor quantum dots

Cited by 176 publications

References 208 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

Additive-Assisted Controllable Growth of Perovskites

Fabrication of Anchored Complexes as Electrodes for Sensing Heavy Metal Ions by Electrochemical Method

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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