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Titanium dioxide grafted carbon quantum dot loaded spiropyran photochromic material as well as preparation method and application thereof

A technology of color-changing materials and spiropyran, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problem of unobvious photochromic response of spiropyran, and achieve improved solid-state color-changing performance, increased free volume, and photoresponse sensitive effect

Active Publication Date: 2021-06-15
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a titanium dioxide grafted carbon quantum dot loaded spiropyran photochromic material and its preparation method and application, to solve the problems in the prior art above, by loading spiropyran on TiO 2 Composite particles prepared on CQDs can improve the shortcoming of spiropyran’s indistinct photochromic response in the solid state, improve the solid-state photochromic performance of spiropyran, and at the same time, the introduction of fluorescent carbon quantum dots enables the composite particles to achieve double color change

Method used

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  • Titanium dioxide grafted carbon quantum dot loaded spiropyran photochromic material as well as preparation method and application thereof
  • Titanium dioxide grafted carbon quantum dot loaded spiropyran photochromic material as well as preparation method and application thereof
  • Titanium dioxide grafted carbon quantum dot loaded spiropyran photochromic material as well as preparation method and application thereof

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Effect test

Embodiment 1

[0034] Step 1: Add 1.0g of maleic anhydride, 1.0g of urea and 13.0mL of absolute ethanol to a 20mL polytetrafluoroethylene reactor, and place the reactor in a high-temperature furnace at 200°C for hydrothermal reaction for 4 hours to obtain fluorescent Carbon quantum dots (CQDs), after cooling, add 50mL deionized water to dilute, centrifuge and wash at 10000rpm, add 500mL absolute ethanol to make carbon quantum dot ethanol dispersion system;

[0035] Add 10mL of triethanolamine, 30mL of n-butanol and 30mL of deionized water into the reaction vessel and stir well at room temperature, then quickly add 16.3mL of n-butyl titanate and 4.1mL of 3-aminopropyltriethoxysilane n-butyl Alcohol solution (70mL), condensed and refluxed at 60°C and stirred for reaction, centrifuged after the reaction, washed 3 times with absolute ethanol and water to prepare aminated titanium dioxide;

[0036] Aminated titanium dioxide, 1-hydroxybenzotriazole monohydrate, N,N'-dicyclohexylcarbodiimide and ca...

Embodiment 2

[0040] Step 1: Add 1.0g of maleic anhydride, 1.0g of urea and 13.0mL of absolute ethanol to a 20mL polytetrafluoroethylene reactor, and place the reactor in a high-temperature furnace at 200°C for hydrothermal reaction for 4 hours to obtain fluorescent Carbon quantum dots (CQDs), after cooling, add 50mL deionized water to dilute, centrifuge and wash at 10000rpm, add 500mL absolute ethanol to make carbon quantum dot ethanol dispersion system;

[0041] Add 10mL of triethanolamine, 30mL of n-butanol and 30mL of deionized water to the reaction vessel and stir well at room temperature, then quickly add 16.3mL of n-butyl titanate and 4.1mL of 3-aminopropyltriethoxysilane n-butyl Alcohol solution (70mL), condensed and refluxed at 60°C and stirred for reaction, centrifuged after the reaction, washed 3 times with absolute ethanol and water to prepare aminated titanium dioxide;

[0042] Aminated titanium dioxide, 1-hydroxybenzotriazole monohydrate, N,N'-dicyclohexylcarbodiimide and carb...

Embodiment 3

[0046] Step 1: Add 1.0g of maleic anhydride, 1.0g of urea and 13.0mL of absolute ethanol to a 20mL polytetrafluoroethylene reactor, and place the reactor in a high-temperature furnace at 200°C for hydrothermal reaction for 4 hours to obtain fluorescent Carbon quantum dots (CQDs), after cooling, add 50mL deionized water to dilute, centrifuge and wash at 10000rpm, add 500mL absolute ethanol to make carbon quantum dot ethanol dispersion system;

[0047] Add 10mL of triethanolamine, 30mL of n-butanol and 30mL of deionized water to the reaction vessel and stir well at room temperature, then quickly add 16.3mL of n-butyl titanate and 4.1mL of 3-aminopropyltriethoxysilane n-butyl Alcohol solution (70mL), condensed and refluxed at 60°C and stirred for reaction, centrifuged after the reaction, washed 3 times with absolute ethanol and water to prepare aminated titanium dioxide;

[0048] Aminated titanium dioxide, 1-hydroxybenzotriazole monohydrate, N,N'-dicyclohexylcarbodiimide and carb...

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Abstract

The invention discloses a titanium dioxide grafted carbon quantum dot loaded spiropyran photochromic material as well as a preparation method and application thereof, and belongs to the field of organic solid photochromic materials. Spiropyrane is loaded on titanium dioxide grafted fluorescent carbon quantum dots TiO2-CQDs, and the molecular space free volume of spiropyrane is increased through the aperture effect of composite particles, so that spiropyrane has enough space in a solid state to carry out ring opening-ring closing reaction, and the color changing performance is improved. And the fluorescence emission wavelength range of the carbon quantum dots and the open-loop absorption wavelength range of the spiropyrane are greatly overlapped, and energy transfer can occur between the carbon quantum dots and the spiropyrane, so that the fluorescence discoloration performance of the material is improved, the dual discoloration response of the material is further realized, and the material has a wide application prospect in the anti-counterfeiting field.

Description

technical field [0001] The invention relates to the field of organic solid-state photochromic materials, in particular to a titanium dioxide-grafted carbon quantum dot-supported spiropyran photochromic double photochromic material and its preparation method and application. Background technique [0002] Photochromism means that after a compound is stimulated by light of a specific wavelength, the structure of the compound changes, resulting in a change in the absorption wavelength of the compound and the change is reversible. As a new type of smart material, photochromic materials can be applied in the fields of optical information storage, anti-counterfeiting materials, decoration and national defense, so photochromic materials have gradually become a research hotspot. At present, the photochromic materials that can be commercially applied in the solid state are mainly inorganic materials. Organic photochromic materials generally need to be used in solvents or blended with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/65C09K11/06
CPCC09K11/025C09K11/65C09K11/06C09K2211/1033
Inventor 杨玉慧何钧照王朝辉赵慧敏何哲江国华
Owner ZHEJIANG SCI-TECH UNIV
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