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Water-soluble molybdenum trioxide up-conversion nanometer material and preparation method thereof

A molybdenum trioxide and nanomaterial technology, applied in the field of nanomaterials, can solve the problem that nanocomposites are not water-soluble, and achieve the effects of good application prospects, improved spectral absorption range, and high luminous intensity.

Active Publication Date: 2015-02-25
启东市昌隆蔬果专业合作社
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the MoO prepared by the literature 3 :Yb / Er nanocomposites are not water soluble and can only be used in the field of photovoltaic cells

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 0.78mmol ammonium heptamolybdate (NH 4 ) 6 Mo 7 o 24 , 0.2mmol of Yb (CF 3 COO) 3 and 0.02mmol of Er(CF 3 COO) 3 Dissolve in deionized water, bath ratio 1:10, sonicate for 1h, add trifluoroacetic acid to adjust the pH value to 2, heat in an oil bath at 100°C for 1h, cool to room temperature naturally, add absolute ethanol, centrifuge to obtain a precipitate, repeat with water and ethanol, and finally the precipitate obtained by centrifugation was annealed at 800 °C for 4 h.

[0021] Mix 1 g / L of 5 mL of molybdenum trioxide upconversion nanoparticles in hexane with 0.1 g / L of 5 mL of nitrosonium tetrafluoroborate NOBF 4 The dichloromethane solution was mixed at room temperature, and the mixture was shaken gently until the UCNPs precipitated, then centrifuged, the supernatant was removed, and redispersed in water, with a volume ratio of 1:10, adding 5 g / L of amino-terminated hyperbranched The polymer aqueous solution was ultrasonically reacted for 20 minutes, cent...

Embodiment 2

[0023] 0.69mmol ammonium heptamolybdate (NH 4 ) 6 Mo 7 o 24 , 0.3mmol of Yb (CF 3 COO) 3 and 0.01mmol of Er(CF 3 COO) 3 Dissolve in deionized water, bath ratio 1:10, sonicate for 5 hours, add trifluoroacetic acid to adjust the pH value to 3, heat in an oil bath at 110°C for 2 hours, cool to room temperature naturally, add absolute ethanol, centrifuge to obtain a precipitate, and repeatedly use water and ethanol, and finally the centrifuged precipitate was annealed at 800 °C for 6 h.

[0024]Mix 2g / L of 5mL molybdenum trioxide upconversion nanoparticle hexane dispersion solution with 0.3g / L of 5mL nitrosonium tetrafluoroborate NOBF 4 The dichloromethane solution was mixed at room temperature, and the mixture was shaken gently until the UCNPs precipitated, then centrifuged, the supernatant was removed, and then redispersed in water, with a volume ratio of 1:5, adding 10 g / L carboxyl-terminated hyperbranched The polymer aqueous solution was ultrasonically reacted for 60 m...

Embodiment 3

[0026] 0.78 mmol of ammonium heptamolybdate (NH 4 ) 6 Mo 7 o 24 , 0.2mmol of Yb (CF 3 COO) 3 and a Tm of 0.02mmol (CF 3 COO) 3 Dissolve in deionized water, bath ratio 1:10, sonicate for 10 hours, add trifluoroacetic acid to adjust the pH value to 4, heat in an oil bath at 120°C for 3 hours, cool to room temperature naturally, add absolute ethanol, centrifuge to obtain a precipitate, and repeatedly use water and ethanol, and finally the centrifuged precipitate was annealed at 800 °C for 8 h.

[0027] Mix 3g / L of 5mL molybdenum trioxide upconversion nanoparticle hexane dispersion solution with 0.3g / L of 5mL nitrosonium tetrafluoroborate NOBF 4 The dichloromethane solution was mixed at room temperature, and the mixture was shaken gently until the UCNPs precipitated, then centrifuged, the supernatant was removed, and then redispersed in water, with a volume ratio of 1:1, adding 20 g / L of hydroxyl-terminated hyperbranched The polymer aqueous solution was ultrasonically reac...

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Abstract

The invention discloses a water-soluble molybdenum trioxide up-conversion nanometer material and a preparation method thereof. The preparation method includes steps of firstly adopting the high-temperature thermal decomposition method to synthesize up-conversion nanoparticles (UCNPs) based on molybdenum trioxide, adopting NOBF4 to treat the UCNPs for replacing oleic acid molecules on the surface of the UCNPs, finally subjecting the UCNPs to reaction with hydrophilic hyperbranched polymers to obtain the water-soluble molybdenum trioxide up-conversion nanometer material. By the water-soluble MoO3:Yb, Er / Tm nanometer material prepared, the optical performance of molybdenum trioxide is improved. The nanometer material can be used for solar cells, so that the spectral absorption range of the solar cells can be enlarged. Meanwhile, the water-soluble molybdenum trioxide up-conversion nanometer material has promising application prospect in bioimaging, fluorescent labelling, drug carriers and the like as being good in water solubility and high in light intensity and being provided with active groups such as amino, carboxyl and hydroxyl available for coupling biomacromolecules.

Description

technical field [0001] The invention relates to a water-soluble molybdenum trioxide up-conversion nano material and a preparation method thereof, belonging to the field of nano materials. Background technique [0002] Rare-earth up-conversion luminescent material Up-conversion (UC) is a luminescent material that emits visible light under near-infrared light excitation, which can convert long-wave radiation into short-wave radiation through a multi-photon mechanism. This material emits light against Stokes' law, so it is also called anti-Stokes' law luminescent material. UC luminescence is based on the transition between 4f electrons of rare earth elements. The luminescence process can be divided into three steps: ① matrix lattice absorbs excitation energy; ② matrix lattice transfers the absorbed excitation energy to excited ions to make them excited; ③ excited rare earth ions emit fluorescence and return to the matrix. There are four main types of upconversion processes: e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/68B82Y40/00
Inventor 赵兵
Owner 启东市昌隆蔬果专业合作社
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