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Quantum dot/titanium dioxide composite nanodot array having visible-light response and preparation method of quantum dot/titanium dioxide composite nanodot array

A nano-dot array, titanium dioxide technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of cytotoxic genes, mutations, etc., and achieve a simple and easy-to-implement preparation method Effect

Active Publication Date: 2015-03-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ultraviolet light has certain toxicity to cells and may cause gene mutation, so this method also has certain defects.

Method used

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  • Quantum dot/titanium dioxide composite nanodot array having visible-light response and preparation method of quantum dot/titanium dioxide composite nanodot array
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  • Quantum dot/titanium dioxide composite nanodot array having visible-light response and preparation method of quantum dot/titanium dioxide composite nanodot array

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Add 62 μL of acetylacetone, 36 μL of deionized water, 100 μL of tetrabutyl titanate, and 0.4 g of polyvinylpyrrolidone to 5 mL of ethanol in sequence, stir at room temperature, and dilute to 10 mL in ethanol to obtain a precursor sol.

[0028] 2) Spin-coat 20 μL of the above precursor sol on the surface of quartz glass at a speed of 8000 rpm; place the sample in a muffle furnace, keep it at 500 °C for 1 h, take it out, rinse with deionized water, and dry to obtain titanium dioxide nanodots array (see figure 1 ). Its UV-Vis curve see Figure 4 Solid line, absorption limit at 401 nm.

Embodiment 2

[0030] 1) Add 100 μL of acetylacetone, 1 μL of deionized water, 36 μL of C quantum dots with an excitation wavelength of 360 nm and a concentration of 5 μg / mL in 5 mL of ethanol, 680 μL of tetrabutyl titanate, 0.1 g of poly Vinylpyrrolidone was stirred at room temperature, and the volume was adjusted to 10 mL with ethanol to obtain a precursor sol.

[0031] 2) Spin-coat 15 μL of the above precursor sol on the surface of the silicon metal substrate at a speed of 6000 rpm; place the sample in a muffle furnace, keep it at 700 °C for 0.5 h, take it out, rinse it with deionized water, and dry it to obtain C quantum dot / titania composite nanodot array (see figure 2 ). The titanium dioxide nanodots range in size from 70 to 200 nm. Figure 4 The dashed line is the UV-Vis curve of the C quantum dot / titanium dioxide composite nanodot array with an excitation wavelength of 360 nm, and its absorption limit is 419 nm, compared with the titanium dioxide nanodot array without visible ligh...

Embodiment 3

[0033] 1) Add 62 μL of acetylacetone, 100 μL of deionized water, 30 μL of C quantum dots with an excitation wavelength of 470 nm and a concentration of 5 μg / mL in 5 mL of ethanol, 1000 μL of tetrabutyl titanate, 0.5 g of poly Vinylpyrrolidone was stirred at room temperature, and the volume was adjusted to 10 mL with ethanol to obtain a precursor sol.

[0034] 2) Spin-coat 10 μL of the above precursor sol on the surface of the tantalum metal substrate at a speed of 10,000 rpm; place the sample in a muffle furnace, keep it at 400°C for 10 h, take it out, rinse it with deionized water, and dry it to obtain C quantum Dot / TiO2 composite nanodot array ( image 3 ). The titanium dioxide nanodots range in size from 70 to 200 nm. Figure 4 The dotted line is the UV-Vis curve of the C quantum dots / titanium dioxide composite nanodot array with an excitation wavelength of 470 nm, and its absorption limit is 431 nm, which is obviously red-shifted compared with the titanium dioxide nanodo...

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Abstract

The invention discloses a quantum dot / titanium dioxide composite nanodot array having visible-light response. On the surface of a substrate, each nanodot in the composite nanodot array is composed of titanium dioxide covered visible-light response quantum dots; the dimension of the composite nanodots ranges from 50-200nm and the density of the composite nanodots ranges from 0.31*10<10> to the power of 10 to 3.01*10<10> to the power of 10 cm<-2>. The preparation process is a one-step method and specifically comprises the following steps: adding the quantum dots while preparing a spin-coating solution, applying the spin-coating solution to the surface of the substrate by use of a sol-gel spin-coating method, and preparing the quantum dot / titanium dioxide composite nanodot array by use of a hydrothermal method or direct annealing; the process is simple and easy to implement. The response and the utilization rate of the composite nanodot array to light can be regulated by regulating the types of the quantum dots and the excitation waveforms of the quantum dots; besides, the hydrophobicity and the hydrophilicity of the surface of the material can be changed by use of visible light different in wavelength, and therefore, later cell detachment is realized and the visible light can be possibly used for cell detachment.

Description

technical field [0001] The invention belongs to the field of biomedical thin films, and in particular relates to a quantum dot / titanium dioxide composite nano-dot array with visible light response performance and a preparation method thereof. Background technique [0002] In recent years, due to the limitations of existing tissue engineering methods, cell sheet tissue engineering technology has attracted widespread attention. The traditional temperature-sensitive system obtains cell sheets by changing the temperature, and the technology develops rapidly, but the disadvantage is that there may be residues of toxic chemicals. Cell detachment can be achieved by changing the charge and hydrophobicity of the surface. Therefore, using light to change the hydrophilicity and hydrophobicity of the surface of a certain material is a more excellent method to obtain cell sheets. Titanium dioxide is non-toxic, has excellent biocompatibility and chemical stability. The band gap of anat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C09K11/56C09K11/88B82Y30/00B82Y20/00B82Y40/00
Inventor 程逵王小召翁文剑
Owner ZHEJIANG UNIV
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