Fluorescent biosensor for the selective determination of dopamine by TGA-capped CdTe quantum dots in human plasma samples

Pourghobadi, Zeinab; Mirahmadpour, Pari; Zare, Hakimeh

doi:10.1016/j.optmat.2018.08.003

Cited by 26 publications

(9 citation statements)

References 46 publications

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“…The XRD results showed re ection planes at (111), (220) and, (311) for CdTe and CdTe-X. We obtained almost similar patterns for all samples indicating similar cubic crystal structures for CdTe, and CdTe-X [57]. The mean crystalline size of CdTe and CdTe-X were determined according to FWHM of diffraction peak based on the Scherer's equation 3nm, which is consistent with the results of the HRTEM.…”

Section: Resultssupporting

confidence: 83%

“…3(A) shows the FTIR spectra of TGA, TGA-caped QDs, and CdTe-X in the range of 200-4000 cm −1 . The characteristic peaks of CdTe and CdTe-X bands at 2563 cm −1 can be attributed to the Vibration band of S-H that is observed in the free TGA molecules disappeared on the coordination of these molecules with colloidal CdTe and CdTe-X [57,58]. This is evidence of the formation of the S-Cd bond between TGA ligand molecule and QDs.…”

Section: Resultsmentioning

confidence: 86%

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Synthesis of Magnetic Ions-Doped QDs Synthesized Via a Facial Aqueous Solution Method for Optical/MR Dual-Modality Imaging Applications

et al. 2021

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This research reports the preparation and examination of Cadmium Telluride (CdTe) Quantum Dots and doping CdTe QDs with Europium (Eu), Gadolinium (Gd), and Manganese (Mn) prepared in aqueous solution using TGA as a capping agent. Magnetic QDs (MQDs) are important agents for uorescence (FL) /magnetic resonance (MR) dual-modal imaging due to their excellent optical and magnetic properties.Herein, the chemical bonds, structural, uorescence, and magnetized properties of CdTe QDs and effect of Mn, Eu, and Gd ions doping on their properties were examined by X-ray powder diffraction (XRD), highresolution transmission electron microscopy (HRTM), Energy-dispersive X-ray spectroscopy (EDX), Fourier-transform infrared spectroscopy (FTIR), photoluminescence spectroscopy (PL), Ultraviolet-visible spectroscopy (UV-Vis), and vibrating sample magnetometer measurements (VSM). Almost similar X-Ray patterns with the absence/presence of ions for all samples with cubic crystal structures were obtained which indicates that the introduction of ions into CdTe QDs could not alteration the cubic primary structure of CdTe. Monodisperse size distribution with seemingly-spherical shapes, and also, the estimated mean diameters about 3 and less than 3 nm of QDs Were obtained. The effect of X ions injection on the uorescence and UV-Vis properties of the QDs were also investigated. Optical studies showed the decreases in bandgap with the heating time increases during synthesis, and they undergo red-shift. The CdTe nanocrystals with high PL quantum yields were achieved in more than 6 h of heating. Also, investigations have shown the quenching of uorescence by the existence of ions in the CdTe QDs.And Also, all the ions doped QDs exhibited ferromagnetic behavior at room temperature by a vibrating sample magnetometer which con rmed the success of the presentation of ions into CdTe cubic crystal structure. They can have been employed as a suitable contrast agent successfully for biological applications such as FL/MR dual-modal imaging.

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 86%

Synthesis of Magnetic Ions-Doped QDs Synthesized Via a Facial Aqueous Solution Method for Optical/MR Dual-Modality Imaging Applications

et al. 2021

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“…Excessive exposure to this ion can cause adverse physiological reactions (such as vomiting, diarrhea, headache, and nausea). Prolonged exposure can lead to kidney failure, liver poisoning, and damage to the human central nervous system. − With the advancement of industrial technology, increasing amounts of Hg 2+ are being used, which inevitably pollute water sources and soil. − Therefore, it is important to detect Hg 2+ present in the environment. − At present, atomic absorption spectroscopy, atomic fluorescence spectrometry, and inductively coupled plasma mass spectrometry (ICP-MS) techniques are used to detect Hg 2+ . − Although these instruments are very accurate and sensitive, they are expensive and complex . These factors limit their widespread use.…”

Section: Introductionmentioning

confidence: 99%

Detection of Hg²⁺ by a Dual-Fluorescence Ratio Probe Constructed with Rare-Earth-Element-Doped Cadmium Telluride Quantum Dots and Fluorescent Carbon Dots

et al. 2021

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Quantum dots (QDs) and carbon quantum dots (CDs) are classes of zero-dimensional materials whose sizes can be ≤10 nm. They exhibit excellent optical properties and are widely used to prepare fluorescent probes for qualitative and quantitative detection of test objects. In this article, we used cerium chloride as the cerium source and used the in situ doped cerium (rare-earth element) to develop cadmium telluride (CdTe) quantum dots following the aqueous phase method. CdTe: Ce quantum dots were successfully synthesized. The solution of CdTe:Ce QDs was mixed with the CD solution prepared following the green microwave method to form a ratio fluorescence sensor that can be potentially used for the selective detection of mercury ions (Hg 2+ ). We used transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and other microscopy and spectral characterization techniques to validate that Ce had been successfully doped. The test results on the fluorescence performance revealed that Ce doping enhances the predoped fluorescence performance of the CdTe QDs. We have quantitatively detected Hg 2+ using a ratiometric fluorescence sensor to show that in the range of 10–60 nM, the fluorescence quenching efficiency increases linearly with the increase in Hg 2+ concentration. The linear correlation coefficient R 2 = 0.9978, and its detection limit was found to be 2.63 nM L –1 . It was observed that other interfering ions do not significantly affect the fluorescence intensity of the probe. According to the results of the blank addition experiment, the developed proportional fluorescence probe can be used for the detection of Hg 2+ in actual samples.

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“…At present, the QD sensors commonly used for cadmium measurement are based on Cd 2+ , especially cadmium telluride (CdTe) and cadmium selenide (CdSe) QDs, and are all single-core QDs [30][31][32]. Most of these reported QDs use the turn-off mode for Cd 2+ detection; only a few use the turn-on mode, which has a lower false positive rate than the turn-off mode and a limit of detection (LOD) in the range of 11-62 µg/L (0.097-0.552 µmol/L) [33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Ammonium Pyrrolidine Dithiocarbamate-Modified CdTe/CdS Quantum Dots as a Turn-on Fluorescent Sensor for Detection of Trace Cadmium Ions

Yin

Yang

Liu

2020

Sensors

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In this work, ammonium pyrrolidine dithiocarbamate (APDC) was used as a surface etchant to modify CdTe/CdS core-shell quantum dots (QDs). The APDC etchant combines with the cadmium ions (Cd2+) on the surface of the QDs, resulting in the formation of surface holes. The formation of these holes changes the QD surface structure, which leads to fluorescence quenching of the QDs. Newly added Cd2+ can selectively recognize and combine with these holes; thus, the fluorescence intensity of the QDs can be restored. The linear response of this turn-on fluorescent sensor was found to be 0–100 μg/L and 100–600 μg/L under the determined optimal conditions, and its limit of detection (LOD) for Cd2+ was 2.642 μg/L (23.5 nmol/L).

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Fluorescent biosensor for the selective determination of dopamine by TGA-capped CdTe quantum dots in human plasma samples

Cited by 26 publications

References 46 publications

Synthesis of Magnetic Ions-Doped QDs Synthesized Via a Facial Aqueous Solution Method for Optical/MR Dual-Modality Imaging Applications

Synthesis of Magnetic Ions-Doped QDs Synthesized Via a Facial Aqueous Solution Method for Optical/MR Dual-Modality Imaging Applications

Detection of Hg²⁺ by a Dual-Fluorescence Ratio Probe Constructed with Rare-Earth-Element-Doped Cadmium Telluride Quantum Dots and Fluorescent Carbon Dots

Ammonium Pyrrolidine Dithiocarbamate-Modified CdTe/CdS Quantum Dots as a Turn-on Fluorescent Sensor for Detection of Trace Cadmium Ions

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Fluorescent biosensor for the selective determination of dopamine by TGA-capped CdTe quantum dots in human plasma samples

Cited by 26 publications

References 46 publications

Synthesis of Magnetic Ions-Doped QDs Synthesized Via a Facial Aqueous Solution Method for Optical/MR Dual-Modality Imaging Applications

Synthesis of Magnetic Ions-Doped QDs Synthesized Via a Facial Aqueous Solution Method for Optical/MR Dual-Modality Imaging Applications

Detection of Hg2+ by a Dual-Fluorescence Ratio Probe Constructed with Rare-Earth-Element-Doped Cadmium Telluride Quantum Dots and Fluorescent Carbon Dots

Ammonium Pyrrolidine Dithiocarbamate-Modified CdTe/CdS Quantum Dots as a Turn-on Fluorescent Sensor for Detection of Trace Cadmium Ions

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Detection of Hg²⁺ by a Dual-Fluorescence Ratio Probe Constructed with Rare-Earth-Element-Doped Cadmium Telluride Quantum Dots and Fluorescent Carbon Dots