S doped silicon quantum dots with high quantum yield as a fluorescent sensor for determination of Fe3+ in water

Zhang, Xiaoshuo; Li, Chunhua; Zhao, Sheliang; Pang, Huiyun; Han, Yong; Luo, Xueli; Tang, Wenzhi; Li, Zhonghong

doi:10.1016/j.optmat.2020.110461

Cited by 31 publications

(13 citation statements)

References 49 publications

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“… , Three peaks were displayed by the XPS spectrum of O 1s at 530.7 eV (Si–O), 531.7 eV (Si–O), and 532.3 eV (C–O–C/C–OH) (Figure S4C). , The XPS spectrum of Si 2p also presented three peaks at 101.3 eV (Si–C), 102.0 eV (Si–N), and 102.4 eV (Si–O) (Figure S4D). The FTIR study is another efficient way to characterize the surface composition of Si CNPs.…”

Section: Results and Discussionmentioning

confidence: 99%

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α-Glucosidase-Triggered Reaction for Fluorometric and Colorimetric Assays Based on the Formation of Silicon-Containing Nanoparticles

et al. 2021

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Designing analytical approaches for enzymatic activity monitoring with high sensitivity and selectivity is of critical value for the diagnosis of diseases and biomedical studies. In this study, we have created a facile one-step synthetic route to prepare orange-red color and yellow fluorescent silicon-containing nanoparticles (Si CNPs) by mixing 3(2-aminoethylamino) propyl (dimethoxymethylsilane) and hydroquinone (HQ) in an aqueous solution. Inspired by the HQ-regulated facile synthetic step and the generation of HQ from α-glucosidase (α-Glu)-catalyzed hydrolysis of 4hydroxyphenyl-α-D-glucopyranosyl (4-HPαDG), we have designed a straightforward colorimetric and fluorometric α-Glu activity assay using a commercially available 4-HPαDG as the α-Glu substrate. Fluorescent and colorimetric assays for α-Glu activity measurement have been thereby established and exhibited detection limits as low as 0.0032 and 0.0046 U/mL, respectively. Under single excitation at 370 nm, the prepared Si CNPs emitted yellow fluorescence at 520 nm and exhibited an absorbance peak at 390 nm. In addition, the proposed approach reveals various advantages including easy operation, time-saving, and good anti-interference ability. Hence, it could improve the progress of fluorometric and colorimetric enzymatic activity assays with high sensitivity and simplicity. Moreover, the proposed approach was applied for α-Glu inhibitor screening, and its feasibility in real samples was measured by detecting the α-Glu activity in human serum samples.

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Section: Results and Discussionmentioning

confidence: 99%

“…S4C). 23,25 The XPS spectrum of Si 2p also presented three peaks at 101.3 eV (Si−C), 102.0 eV (Si−N), and 102.4 eV (Si−O) (Figure S4D). 26 The FTIR study is another efficient way to characterize the surface composition of Si CNPs.…”

Section: Synthesis and Purification Of Si Cnpsmentioning

confidence: 99%

α-Glucosidase-Triggered Reaction for Fluorometric and Colorimetric Assays Based on the Formation of Silicon-Containing Nanoparticles

et al. 2021

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“…However, the US Environmental Protection Agency has reported that the limit of detection was lower than the maximum level (0.3 mg/ L, equivalent to 5.4 μmol/L) of Fe 3+ permitted in drinking water. 18 If Fe 3+ is intentionally used as ferricyanide ([Fe-(CN) 6 ] 3− ), then it can be found in water reservoirs as a highly stable complex is formed. Substances toxic to human beings and/or the environment and physiological systems are formed.…”

Section: Introductionmentioning

confidence: 99%

“…Iron deficiency is attributed to coronary heart disease, cancer, immune system dysfunction, and diabetes. − Moreover, in the field of environmental quality assessment, the content of Fe 3+ is an important indicator of water quality as the iron ions are present in their stable forms in solution (present as Fe 2+ , Fe 3+ , complex anions, and/or other organo-iron complexes). However, the US Environmental Protection Agency has reported that the limit of detection was lower than the maximum level (0.3 mg/L, equivalent to 5.4 μmol/L) of Fe 3+ permitted in drinking water . If Fe 3+ is intentionally used as ferricyanide ([Fe(CN) 6 ] 3– ), then it can be found in water reservoirs as a highly stable complex is formed.…”

Section: Introductionmentioning

confidence: 99%

A Fluorescence Switching Sensor for Sensitive and Selective Detections of Cyanide and Ferricyanide Using Mercuric Cation-Graphene Quantum Dots

et al. 2021

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This study aims to use graphene quantum dots (GQDs) as a fluorescence switching sensor (turn on–off) for the simultaneous detection of cyanide (CN–) and ferricyanide [Fe(CN)6]3– in wastewater samples. The GQDs were synthesized by pyrolyzing solid citric acid. The intrinsic blue color of the solution was observed under ultraviolet irradiation. The fluorescence spectrum was maximized at both excitation and emission wavelengths of 370 and 460 nm, respectively. The fluorescence intensity of GQDs decorated with Hg2+ (turn-off mode as the starting baseline) could be selectively turned on in the presence of CN– and once back to turn-off mode by [Fe(CN)6]3–. The fluorescence switching properties were used to develop a fluorescence turn-on–off sensor that could be used to detect trace amounts of CN– and [Fe(CN)6]3– in water samples. For highly sensitive detection under optimum conditions (Britton–Robinson buffer solution in the pH range of 8.0–9.0, linearity ranges of 5.0–15.0 μM (R 2 = 0.9976) and 10.0–50.0 μM (R 2 = 0.9994), respectively, and detection limits of 3.10 and 9.48 μM, respectively), good recoveries in the ranges of 85.89–112.66% and 84.88–113.92% for CN– and [Fe(CN)6]3–, respectively, were recorded. The developed methods were successfully used for the simultaneous and selective detection of CN– and [Fe(CN)6]3– in wastewater samples obtained from local municipal water reservoirs.

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“…Various uorescent nanomaterials have also been developed for the analysis of Fe 3+ , e.g., quantum dots, small molecule probes, metal-organic frameworks, and metal nanoclusters etc. [20][21][22][23][24] However, it is worthy to be mentioned that the existing sensitivity and selectivity remain signi cant challenges for in-situ and portable detection. The research and development of direct, fast, and highly sensitive probes for Fe 3+ is still desirable and important.…”

Section: Introductionmentioning

confidence: 99%

N, N-Dimethyl Formamide Regulating Fluorescence of MXene Quantum Dots for the Sensitive Determination of Fe3+

Gao

Shao

Qin

et al. 2021

Preprint

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Due to widely use of iron in all kinds of areas, the design and construction of direct, fast, and highly sensitive sensor for Fe3+ is highly desirable and important. In the present work, a kind of fluorescent MQDs were synthesized via an intermittent ultrasound process with N,N-dimethyl formamide as solvent. The prepared MQDs were characterized via a combination of UV-Vis absorption, fluorescence spectra, X-ray photoelectron energy spectra, and Fourier transform infrared spectroscopy. Based on the electrostatic induced aggregation quenching mechanism, the fluorescent MQDs probes exhibited excellent sensing performance for the detection of Fe3+, with a sensitivity of 0.6377 mM− 1 and the detection limit of 1.4 µM, superior to those reported in literatures. The present MQDs-based probes demonstrate potential promising applications as the sensing device of Fe3+.

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S doped silicon quantum dots with high quantum yield as a fluorescent sensor for determination of Fe3+ in water

Cited by 31 publications

References 49 publications

α-Glucosidase-Triggered Reaction for Fluorometric and Colorimetric Assays Based on the Formation of Silicon-Containing Nanoparticles

α-Glucosidase-Triggered Reaction for Fluorometric and Colorimetric Assays Based on the Formation of Silicon-Containing Nanoparticles

A Fluorescence Switching Sensor for Sensitive and Selective Detections of Cyanide and Ferricyanide Using Mercuric Cation-Graphene Quantum Dots

N, N-Dimethyl Formamide Regulating Fluorescence of MXene Quantum Dots for the Sensitive Determination of Fe3+

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