Chitosan/quantum dot nanocomposite film and preparation method and application thereof

A nano-composite, chitosan technology, applied in the fields of optics and polymer chemistry, can solve the problems of uneven distribution, many surface defects, agglomeration, etc., to achieve improved quantum efficiency, clean preparation process, excellent mechanical properties and processability Effect

Active Publication Date: 2012-07-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inert compounding of nanomaterials and substrate materials can easily lead to problems such as agglomeration, uneven distribution, and many surface defects.

Method used

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  • Chitosan/quantum dot nanocomposite film and preparation method and application thereof
  • Chitosan/quantum dot nanocomposite film and preparation method and application thereof
  • Chitosan/quantum dot nanocomposite film and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Weigh 0.186g Dy 2 o 3 Add 1ml of concentrated hydrochloric acid and heat in an electric furnace until the oxides are completely dissolved and all the hydrochloric acid volatilizes to leave white crystals to make 10 -3 M solution of rare earth chloride (DyCl 3 solution). Cd(AC) 2 Dissolve in hot ethanol to obtain a supersaturated solution, then stand for recrystallization, filter and dry to obtain a pure product. Configuration 5mg / ml chitosan dilute acetic acid solution 50ml (the concentration of acetic acid solution is 2%, V / V; The molecular weight of chitosan is 200,000), adds 10 -1 mol / l purified cadmium acetate solution 2ml, DyCl 3 Solution (10 -3 M) 8ml, stirred overnight to reach coordination equilibrium. will contain Cd 2+ The chitosan solution degassed under reduced pressure (reducing the pressure is helpful for degassing), cast on a clean glass plate placed horizontally, dried at room temperature to form a film, and then placed the film in a concentratio...

Embodiment 2

[0035] Weigh 0.187g Tb 4 o 7 Add 1ml of concentrated hydrochloric acid and heat in an electric furnace until the oxides are completely dissolved and all the hydrochloric acid volatilizes to leave white crystals to make 10 -3 Dilute solutions of M rare earth chlorides (TbCl 3 solution). Configuration 5mg / ml chitosan dilute acetic acid solution 50ml (the concentration of acetic acid solution is 2%, V / V; Chitosan molecular weight is 200,000), adds 10 -1 mol / l purified cadmium acetate solution 2ml, TbCl 3 Solution (10 -3 M) 8ml, stirred overnight to reach coordination equilibrium. will contain Cd 2+ The chitosan solution was defoamed under reduced pressure, cast on a clean glass plate placed horizontally, dried at room temperature to form a film, and then the film was placed in a concentration of 5×10 -3 Na of M 2 In the S solution, take it out after reacting for 2 minutes, the appearance of the film changes from colorless to yellow, wash it with a large amount of saturate...

Embodiment 3

[0037] Weigh 0.185Eu 2 o 3 Add 1ml of concentrated hydrochloric acid and heat in an electric furnace until the oxides are completely dissolved and all the hydrochloric acid volatilizes to leave white crystals to make 10 -3 Dilute solutions of M rare earth chlorides (EuCl 3 solution). Cd(AC) 2 Dissolve in hot ethanol to obtain a supersaturated solution, then stand for recrystallization, filter and dry to obtain a pure product. Configuration 5mg / ml chitosan dilute acetic acid solution 50ml (concentration of acetic acid solution is 2%, V / V; Chitosan molecular weight is 200,000), adds 10 -1 mol / l purified cadmium acetate solution 2ml, EuCl 3 Solution (10 -3 M) 8ml, stirred overnight to reach coordination equilibrium. will contain Cd 2+ The chitosan solution was defoamed under reduced pressure, cast on a clean glass plate placed horizontally, dried at room temperature to form a film, and then the film was placed in a concentration of 5×10 -3 Na of M 2 In the S solution, t...

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Abstract

The invention discloses a method for preparing a chitosan / quantum dot nanocomposite film. The method comprises the following steps of: (1) preparing 50 milliliters of dilute acetic acid solution of chitosan, adding cadmium acetate or zinc acetate into the dilute acetic acid solution of chitosan and stirring the solution for a night to reach coordination equilibrium, wherein per ml of the dilute acetic acid solution of the chitosan comprises 5 milligrams of the chitosan; and in the cadmium acetate or zinc acetate, the concentration is 0.1 mol / L and the volume is 1 to 10 ml; (2) defoaming the Zn<2+> or Cd<2+>-containing dilute acetic acid solution of the chitosan under reduced pressure, curtain coating the Zn<2+> or Cd<2+>-containing dilute acetic acid solution of the chitosan on a horizontal clean glass plate and drying the Zn<2+> or Cd<2+>-containing dilute acetic acid solution of the chitosan in the air at room temperature to form a film; (3) placing the film in the solution of sodium sulfide (Na2S) with the concentration of 5*10<-3> to 2*10<-2> M to perform a reaction for 2 to 5 minutes and taking out the film; and (4) cleaning the film with a great deal of saturated solution ofsodium chloride (NaCl) and then performing vacuum drying to obtain the chitosan / quantum dot nanocomposite film. The chitosan / quantum dot nanocomposite film has the advantages of excellent photoluminescence and three-stage nonlinear optical properties and wide application in the fields of all-optical conversion, optical storage and optical communication.

Description

technical field [0001] The invention relates to a chitosan / quantum dot nanocomposite film used for third-order nonlinear optical materials and a bionic preparation method and application thereof, belonging to the fields of optics and polymer chemistry. Background technique [0002] Nonlinear optical materials are of great significance in the fields of optical communication, optical storage, optical conversion, and photonic computers. In recent years, semiconductor quantum dots have become a hotspot in the research of nonlinear optical materials due to their ultrafast response time and large third-order nonlinear susceptibility. However, because nanoparticles are very active in chemical properties, it is difficult to preserve them for a long time. On the other hand, due to the huge surface energy of nanoparticles, they tend to aggregate and reduce their surface energy. This instability limits the application of quantum dots. Therefore, how to transform quantum dots from a so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L5/08C08K3/30C08J5/18G02F1/361
Inventor 王小慧李栋孙润仓
Owner SOUTH CHINA UNIV OF TECH
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