Red-shifted electrochemiluminescence of CdTe nanocrystals via Co2+-Doping and its spectral sensing application in near-infrared region

Gao, Xuwen; Fu, Kena; Fu, Li; Wang, Huaisheng; Zhang, Bin; Zou, Guizheng

doi:10.1016/j.bios.2019.111880

Cited by 42 publications

(22 citation statements)

References 58 publications

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“…Luminophores for NIR ECL emission are strongly anticipated, such as tetraphenylethylene, graphite oxide, and CdTe nanocrystals . However, very few luminophores have been developed with an ECL emission wavelength beyond 800 nm in an aqueous medium, such as the recently reported Co 2+ -doped CdTe nanocrystals with a maximum ECL emission around 815 nm . The other manner is developing biocompatible and environmentally friendly luminophores for extended bioassays. − Among them, metal nanoclusters (NCs) are fascinating nanomaterials with unique optical, electrical, chemical, and physical properties. − The ECL properties of metal NCs have aroused much attention for ECL evolution. − Recent research demonstrated that Au NCs are promising biocompatible and environmentally friendly luminophores for NIR ECL. , Ding pioneered the ECL studies of organic soluble Au clusters and presented an efficient NIR ECL wavelength beyond 900 nm with these Au NCs as luminophores in an organic medium. − Wang achieved an aqueous NIR ECL wavelength around 700 nm from Au NCs, whereas Peng and Kim enabled a red-shifted aqueous NIR ECL wavelength of ∼800 nm from Au NCs. , Bovine-serum-albumin-templated Au NCs (BSA-Au NCs) have particularly attracted significant interest as an NIR fluorescent luminophor with advantages of simple and green production, high quantum yields, and high stability in aqueous solutions and the solid form .…”

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Near-Infrared Electrochemiluminescence Immunoassay with Biocompatible Au Nanoclusters as Tags

Zhang

Kang

et al. 2020

Anal. Chem.

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The design and development of novel electrochemiluminescence (ECL) systems with near-infrared (NIR) emission beyond 800 nm are promising for ECL evolution, especially for improving the throughput of the spectrum-resolved multiplexing ECL assay and biological imaging. Herein a biocompatible and environmentally friendly luminophore, that is, the methionine-stabilized Au nanoclusters (Met-Au NCs), are proposed to achieve efficient aqueous ECL of ∼835 nm with triethanolamine as coreactant. The Met-Au NCs not only demonstrate a 75 times enhanced ECL compared with the traditional Au NCs with bovine serum albumin as a capping agent but also can be employed as ECL tags to label proteins with a methionine linker and enable a highly sensitive NIR ECL bioassay. A sandwich-type NIR ECL immunosensor is constructed with the Met-Au NCs as tags and α-fetoprotein (AFP) as a model analyte and exhibits a wide linearity range from 3 fg·mL–1 to 0.1 ng·mL–1 with a limit of detection of 1 fg mL–1 (S/N = 3) as well as desired selectivity.

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Near-Infrared Electrochemiluminescence Immunoassay with Biocompatible Au Nanoclusters as Tags

Zhang

Kang

et al. 2020

Anal. Chem.

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“…双稳定剂包被技术同样适用于制备表面钝化的 CdZnSe [40] 、CdTe/CdS [38] 、CdTe/ZnSe [78] 以及Co 2+ 掺杂CdTe (Co-CdTe)量子点 [56] , 所制备量子点的ECL光谱与光致发光光谱基本一致. 在前驱体中引入Zn 2+ 能够制备双稳定剂包被的三元CdZnSe量子点 [40] ; 由Zn 2+ 掺杂形成的内部缺陷导致CdZnSe量子点在长波区出现缺陷辐射, CdZnSe量子点的ECL与光致发光均为双波段辐射 [40] .…”

Section: 适用于光谱型定量分析的Ecl试剂研发unclassified

“…在前驱体中引入Zn 2+ 能够制备双稳定剂包被的三元CdZnSe量子点 [40] ; 由Zn 2+ 掺杂形成的内部缺陷导致CdZnSe量子点在长波区出现缺陷辐射, CdZnSe量子点的ECL与光致发光均为双波段辐射 [40] . 在前驱体中引入Co 2+ 能够制备双稳定剂包被的、产生单波段ECL辐射的三元Co-CdTe量子点 [56] ; 该量子点的ECL波段位于815 nm处, 超越了双稳定剂包被CdTe量子点ECL辐射波段最大至800 nm的限制 [63] .…”

Section: 适用于光谱型定量分析的Ecl试剂研发unclassified

Progress in spectrum-based electrochemiluminescence quantitative analysis

Fu¹,

Gao²,

Dong³

et al. 2021

Sci. Sin.-Chim

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“…Among luminescent species, such as Ru(bpy) 3 2+ and luminol, quantum dots (QDs) has been employed as luminescent species for labels in ECL measurements due to several characteristics including stable uorescence, high e ciency of emission, easy modi cation, variety of emission spectra, and a narrow luminescence [20][21][22]. Many kinds of semiconductor materials can be synthesized as QDs, such as CdSe [23], CdS [24], and CdTe [25] as well as their composed derivatives to apply in the ECL emitters.…”

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confidence: 99%

Gradients of a Sandwich-structured Immunosensor Controlled Using Magnetized Masks for Determination of Human Serum Albumin Using Electrochemiluminescence

Huang

Chang

Huang

et al. 2021

Preprint

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Background: Separation of macromolecules or particles from a colloid system to from gradient structure on the surface has been employed for biosensing systems, suggesting an enhancement of the chemical and physical features of particles. Performance of an electrochemiluminescence (ECL) immunosensor was employed to improve with a particle gradient.Results: Magnetic beads with silicon dioxide coating were adopted as nanocarriers for gradient manipulation and immobilized with the primary antibody. Cadmium telluride quantum dots (CdTe QDs) were coated with a layer of protein G for conjugation and orientation of secondary antibody as signal labels. ECL immunosensor gradients upon the electrode were formed by magnetolithography with magnetized nickel masks of column and stripe arrays at various scales. The immunosensor generally aggregated as island on the substrate through a dry process of water evaporation leading to a decrease of efficiency in the characteristic signals. Stripe arrays of magnetized nickel were designed to generate cylindrical magnetic flux on the substrate to improve the particle manipulation with the gradient. Various gradients of the sandwich-structured immunosensor substantially affected the electrochemical performance. Compared to the gradient-free immunosensor, the gradient of the immunosensor generated using the 3-μm-stripe array mask of magnetolithography enhanced the ECL intensity ~2.2 times. Conclusions: The results of quantification of human serum albumin (HSA) with the gradient immunosensor showed a broad linear range (15–420 ng mL−1), a low limit of detection (8 ng mL−1) and high reliability for HSA-spiked serum samples, indicating that the immunosensor gradient substantially enhances the performance of the ECL assay.

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Red-shifted electrochemiluminescence of CdTe nanocrystals via Co2+-Doping and its spectral sensing application in near-infrared region

Cited by 42 publications

References 58 publications

Near-Infrared Electrochemiluminescence Immunoassay with Biocompatible Au Nanoclusters as Tags

Near-Infrared Electrochemiluminescence Immunoassay with Biocompatible Au Nanoclusters as Tags

Progress in spectrum-based electrochemiluminescence quantitative analysis

Gradients of a Sandwich-structured Immunosensor Controlled Using Magnetized Masks for Determination of Human Serum Albumin Using Electrochemiluminescence

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