Synthesis and characterization of two-dimensional carbon dots decorated with molybdenum oxide nanoflakes with various phases

Aqueous aluminum‐ion batteries are at an early development stage and there is a need to discover new electrode materials for the fabrication of high energy density devices. To address this issue, we investigate MoO3 nanowires as a possible electrode material for use in rechargeable Al‐ion batteries that can operate in aqueous conditions. We present a hexagonal structure of MoO3 microrods as an Al‐ion intercalation host material and show its first‐time use as a potential electrode for an aqueous Al‐ion battery system. This yields a discharge capacity of approximately 300 mAh g−1 for 150 cycles and around 90 % retention after 400 cycles at a current density of 3 A g−1. The utilization of this type of material and aqueous electrolytes guarantees both safety during operation and simple recycling of spent batteries.

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“…The obtained dark blue powder was used for further characterization. This blue color has been seen previously for nanosized MoO 3 …”

Section: Methodsmentioning

confidence: 99%

Hexagonal Molybdenum Trioxide (h‐MoO₃) as an Electrode Material for Rechargeable Aqueous Aluminum‐Ion Batteries

2019

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“…Carbon quantum dots were prepared by an eco-friendly microwave-assisted method, which is analogous to the CD synthesis in previous reports [47, 48]. In a typical production, 17.1 g of sucrose was dissolved in deionized water to prepare 1 M sucrose solution.…”

Section: Methodsmentioning

confidence: 99%

Facile Bottom-up Preparation of WS2-Based Water-Soluble Quantum Dots as Luminescent Probes for Hydrogen Peroxide and Glucose

et al. 2019

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Photoluminescent zero-dimensional (0D) quantum dots (QDs) derived from transition metal dichalcogenides, particularly molybdenum disulfide, are presently in the spotlight for their advantageous characteristics for optoelectronics, imaging, and sensors. Nevertheless, up to now, little work has been done to synthesize and explore photoluminescent 0D WS 2 QDs, especially by a bottom-up strategy without using usual toxic organic solvents. In this work, we report a facile bottom-up strategy to synthesize high-quality water-soluble tungsten disulfide (WS 2 ) QDs through hydrothermal reaction by using sodium tungstate dihydrate and l -cysteine as W and S sources. Besides, hybrid carbon quantum dots/WS 2 QDs were further prepared based on this method. Physicochemical and structural analysis of QD hybrid indicated that the graphitic carbon quantum dots with diameters about 5 nm were held onto WS 2 QDs via electrostatic attraction forces. The resultant QDs show good water solubility and stable photoluminescence (PL). The excitation-dependent PL can be attributed to the polydispersity of the synthesized QDs. We found that the PL was stable under continuous irradiation of UV light but can be quenched in the presence of hydrogen peroxide (H 2 O 2 ). The obtained WS 2 -based QDs were thus adopted as an electrodeless luminescent probe for H 2 O 2 and for enzymatic sensing of glucose. The hybrid QDs were shown to have a more sensitive LOD in the case of glucose sensing. The Raman study implied that H 2 O 2 causes the partial oxidation of QDs, which may lead to oxidation-induced quenching. Overall, the presented strategy provides a general guideline for facile and low-cost synthesis of other water-soluble layered material QDs and relevant hybrids in large quantity. These WS 2 -based high-quality water-soluble QDs should be promising for a wide range of applications in optoelectronics, environmental monitoring, medical imaging, and photocatalysis. Electronic supplementary material The online version of this article (10.1186/s11671-019-3109-5) contains supplementary material, which is available to authorized users.

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“…[28][29][30] Research work have indicated that molybdenum oxide (MoO 3 ) has various forms: one of them is the thermodynamic and stable phase of orthorhombic α-MoO 3 , [11][12][13] and the others are metastable phases of monoclinic β-MoO 3 , [31] hexagonal h-MoO 3 . [32,33] The conversion of the stoichiometric MoO 3 into nonstoichiometric oxygen deficiency molybdenum oxide (MoO 3-x ) since that the becoming of heterovalent heteroatoms or lattice vacancies or lattice vacancies [34,35] have excellent advantages, such as electrical conductivity, catalytic properties, optical properties and so on, to be achieved by controlling and adjusting the valence state of molybdenum element [36,37] which will be applied in various science fields. Furthermore, increased with oxygen hole, the color of MoO 3-x arrange from blank to obvious blue with an valid LSPR absorption in NIR.…”

Section: Introdutionmentioning

confidence: 99%

Morphology‐controlled Synthesis of Molybdenum Oxide with Tunable Plasmon Absorption for Phothermal Therapy of Cancer

Zhang

Guo

et al. 2020

ChemNanoMat

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Semiconductor nanocrystals showing surface plasmonic absorption features can be used as prospective substitutes for noble metallic nanoparticles. Herein, a creative one‐pot hydrothermal route without template is used to synthesize plasmonic oxygen deficiency molybdenum oxide (MoO3‐x) nanoparticles. The morphologies of as‐prepared MoO3‐x nanomaterials arranged from amorphous to crystalline with the reaction temperature varied from 160 °C, 180 °C to 200 °C, namely MoO3‐x quantum dots (QDs), MoO3‐x nanosheets, and MoO2 nanospheres. Simultaneously, in the near‐infrared region (NIR), MoO3‐x nanomaterials exhibit gradually enhanced localized surface plasmon resonance (LSPR) absorption, of which MoO2 nanospheres exhibit intense NIR absorption with a photothermal conversion efficiency up to 72.5% under 808 nm NIR laser irradiation. Moreover, the toxicity and cancer therapy efficacy of MoO2 nanospheres have been systematically assessed in vitro and in vivo, respectively. The results revealed that MoO2 nanospheres exhibit low toxicity and high therapeutic efficiency, making it an promising and effective photothermal agent in photothermal therapy

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Synthesis and characterization of two-dimensional carbon dots decorated with molybdenum oxide nanoflakes with various phases

Abstract: Demonstrated novel synthesis of two dimensional MoO3 nanoflakes decorated by C-dots. Unique optoelectronic properties revealed at longer wavelength (850 nm).

Cited by 9 publications

References 24 publications

Hexagonal Molybdenum Trioxide (h‐MoO₃) as an Electrode Material for Rechargeable Aqueous Aluminum‐Ion Batteries

Hexagonal Molybdenum Trioxide (h‐MoO₃) as an Electrode Material for Rechargeable Aqueous Aluminum‐Ion Batteries

Facile Bottom-up Preparation of WS2-Based Water-Soluble Quantum Dots as Luminescent Probes for Hydrogen Peroxide and Glucose

Morphology‐controlled Synthesis of Molybdenum Oxide with Tunable Plasmon Absorption for Phothermal Therapy of Cancer

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Synthesis and characterization of two-dimensional carbon dots decorated with molybdenum oxide nanoflakes with various phases

Abstract: Demonstrated novel synthesis of two dimensional MoO3 nanoflakes decorated by C-dots. Unique optoelectronic properties revealed at longer wavelength (850 nm).

Cited by 9 publications

References 24 publications

Hexagonal Molybdenum Trioxide (h‐MoO3) as an Electrode Material for Rechargeable Aqueous Aluminum‐Ion Batteries

Hexagonal Molybdenum Trioxide (h‐MoO3) as an Electrode Material for Rechargeable Aqueous Aluminum‐Ion Batteries

Facile Bottom-up Preparation of WS2-Based Water-Soluble Quantum Dots as Luminescent Probes for Hydrogen Peroxide and Glucose

Morphology‐controlled Synthesis of Molybdenum Oxide with Tunable Plasmon Absorption for Phothermal Therapy of Cancer

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Product

Resources

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Hexagonal Molybdenum Trioxide (h‐MoO₃) as an Electrode Material for Rechargeable Aqueous Aluminum‐Ion Batteries

Hexagonal Molybdenum Trioxide (h‐MoO₃) as an Electrode Material for Rechargeable Aqueous Aluminum‐Ion Batteries