MoS2‐QD‐Based Dual‐Model Photoluminescence Sensing Platform for Effective Determination of Al3+ and Fe3+ Simultaneously in Various Environment

Wu, Qian; Wang, Xiaojie; Jiang, Yingnan; Sun, Weiyi; Wang, Chuanxi; Yang, Minghui; Zhang, Chi

doi:10.1002/slct.201702193

Cited by 22 publications

(15 citation statements)

References 58 publications

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“…Further, this coordination will support the electron transfer from the excited state S 1 of the f-WS 2 -QDs to the half-filled 3d orbitals of Fe 3+ . Now, since electron transfer from 3d orbitals of Fe 3+ to the S 0 orbitals of f-WS 2 -QDs is forbidden according to the selection rule, this leads to significant fluorescence quenching of f-WS 2 -QDs …”

Section: Resultsmentioning

confidence: 99%

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In Situ Functionalized Fluorescent WS₂-QDs as Sensitive and Selective Probe for Fe³⁺ and a Detailed Study of Its Fluorescence Quenching

Singh

Mishra

Ali

et al. 2018

ACS Appl. Nano Mater.

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Most of the reports suggest that liquid exfoliated WS2-QDs are unstable; therefore the need of present day is to develop a novel synthesis route for producing long-term stable WS2-QDs. Herein, we report a bottom-up single-step hydrothermal growth of in situ functionalized blue fluorescent WS2-QDs with stable fluorescence in aqueous media without subsequent treatments. Presence of various functional groups over the surface of f-WS2-QDs provides high solubility and stability to f-WS2-QDs in aqueous media preserving its fluorescence. Further, photoluminescence property of f-WS2-QDs has been employed to devise an optical sensor with a high sensitivity (K D ∼ 104 M–1) and selectivity for ferric (Fe3+) ions. Under the optimal condition, response of the sensor is found to be linear in the range of 0–55 μM with a limit of detection (LOD) of 1.32 μM, which is within the maximum permissible level of Fe3+ (∼5.4 μM) in human drinking water by the USEPA. Further, we have also carried out a detailed evaluation on fluorescence quenching kinetics of f-WS2-QDs. Nonlinear behavior of S–V plot and TRPL measurements suggest that quenching is a mixed phenomenon of dynamic as well as static processes. Finally we have proposed a mechanism for fluorescence quenching of f-WS2-QDs in the presence of Fe3+.

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Section: Resultsmentioning

confidence: 99%

“…Now, since electron transfer from 3d orbitals of Fe 3+ to the S 0 orbitals of f-WS 2 -QDs is forbidden according to the selection rule, this leads to significant fluorescence quenching of f-WS 2 -QDs. 47…”

Section: ■ Results and Discussionmentioning

confidence: 99%

In Situ Functionalized Fluorescent WS₂-QDs as Sensitive and Selective Probe for Fe³⁺ and a Detailed Study of Its Fluorescence Quenching

Singh

Mishra

Ali

et al. 2018

ACS Appl. Nano Mater.

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“…Lin et al prepared MoS 2 QDs with different functionalizations through surface modification of MoS 2 QDs with thiol-containing capping agents using a simple hydrothermal method [ 15 ]. Wu et al [ 16 ] synthesized cysteine-functionalized MoS 2 quantum dots (Cys-MoS 2 QDs) by a simple amidation reaction, finding that Cys-MoS 2 QDs had stable fluorescence. Roy et al [ 17 ] synthesized water-soluble MoS 2 QDs using a simplistic bottom-up hydrothermal method.…”

Section: Introductionmentioning

confidence: 99%

MoS2 QDs/8-Armed Poly(Ethylene Glycol) Fluorescence Sensor for Three Nitrotoluenes (TNT) Detection

Zhang

2021

Biosensors

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In this work, ammonia cross-linked 8-armed polyethylene glycol hydrogel material was successfully synthesized and used as a template for synthesizing nanoparticles with fluorescent properties. The 8-armed polyethylene glycol hydrogel template was used to prepare molybdenum disulfide quantum dots (MoS2 QDs). The ammonium tetrathiomolybdate functioned as a molybdenum source and hydrazine hydrate functioned as a reducing agent. The fluorescence properties of the as-prepared MoS2 QDs were investigated. The bursting of fluorescence caused by adding different concentrations of explosive TNT was studied. The study indicated that the synthesized MoS2 QDs can be used for trace TNT detection with a detection limit of 6 nmol/L and a detection range of 16–700 nmol/L. Furthermore, it indicated that the fluorescence-bursting mechanism is static bursting.

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“…In this experiment, we have introduced a two-step sequential on–off strategy. Cu 2+ /EDTA was used as a quencher/masker pair for AuNCs, , while the Fe 3+ /F – pair served the purpose for MQD and WQD (Figure a). In this way, nine different nitroaromatics at 0.1 mM concentration were detected with 100% classification accuracy.…”

Section: Introductionmentioning

confidence: 99%

Functionalized Fluorescent Nanodots for Discrimination of Nitroaromatic Compounds

Behera

Mohanty

2020

ACS Appl. Nano Mater.

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Multiplexing the sensor array can save the time and sensor elements in detection of various unknowns. However, sometimes, that method compromises the sensitivity of a sensor system. Alternatively, a sequential on−off strategy can be applied in a sensor array to enhance the sensitivity. In this strategy, instead of separating individual sensor elements, sequential addition of quenching and masking agents to the pre-established sensor array can enhance the signal output information, sensitivity, and classification accuracy. Herein, three different quantum dots, that is, gold nanoclusters (AuNCs), MoS 2 quantum dots (MQD) and WS 2 quantum dots (WQD) were used as fluorescent receptors for the sensing of nitroaromatic compounds. These electron-rich quantum dots with versatile surface property provide an array based on the quenching efficiency of nitroaromatic compounds. By using standard array-based sensing, we were not able to classify a large number of nitroaromatic compounds, whereas 100% classification was achieved by employing the suitable surface functionality and sequential on−off strategy. Furthermore, we have studied the mechanism of sequential sensing. According to the optical study, the primary inner-filter effect plays an important role in the quenching of fluorescence intensity of quantum dots. Fluorescence lifetime measurement suggests that AuNCs exhibit the dynamic mode of quenching and transition-metal dichalcogenide quantum dots (MQD and WQD) exhibit the static mode of quenching. This developed methodology can be extended to sensing of other analytes.

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MoS₂‐QD‐Based Dual‐Model Photoluminescence Sensing Platform for Effective Determination of Al³⁺ and Fe³⁺ Simultaneously in Various Environment

Cited by 22 publications

References 58 publications

In Situ Functionalized Fluorescent WS₂-QDs as Sensitive and Selective Probe for Fe³⁺ and a Detailed Study of Its Fluorescence Quenching

In Situ Functionalized Fluorescent WS₂-QDs as Sensitive and Selective Probe for Fe³⁺ and a Detailed Study of Its Fluorescence Quenching

MoS2 QDs/8-Armed Poly(Ethylene Glycol) Fluorescence Sensor for Three Nitrotoluenes (TNT) Detection

Functionalized Fluorescent Nanodots for Discrimination of Nitroaromatic Compounds

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MoS2‐QD‐Based Dual‐Model Photoluminescence Sensing Platform for Effective Determination of Al3+ and Fe3+ Simultaneously in Various Environment

Cited by 22 publications

References 58 publications

In Situ Functionalized Fluorescent WS2-QDs as Sensitive and Selective Probe for Fe3+ and a Detailed Study of Its Fluorescence Quenching

In Situ Functionalized Fluorescent WS2-QDs as Sensitive and Selective Probe for Fe3+ and a Detailed Study of Its Fluorescence Quenching

MoS2 QDs/8-Armed Poly(Ethylene Glycol) Fluorescence Sensor for Three Nitrotoluenes (TNT) Detection

Functionalized Fluorescent Nanodots for Discrimination of Nitroaromatic Compounds

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Product

Resources

About

MoS₂‐QD‐Based Dual‐Model Photoluminescence Sensing Platform for Effective Determination of Al³⁺ and Fe³⁺ Simultaneously in Various Environment

In Situ Functionalized Fluorescent WS₂-QDs as Sensitive and Selective Probe for Fe³⁺ and a Detailed Study of Its Fluorescence Quenching

In Situ Functionalized Fluorescent WS₂-QDs as Sensitive and Selective Probe for Fe³⁺ and a Detailed Study of Its Fluorescence Quenching