In-situ biomimetic preparation method and application of composite titanium dioxide nano material

A technology of nanomaterials and titanium dioxide, which is applied in the fields of nanoscience, material science, and electrochemical sensing, and can solve problems such as complex preparation steps

Active Publication Date: 2017-05-31
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the purposes of the present invention is to provide a general method for preparing composite titanium dioxide nanomaterials, which solves problems such as complicated steps of traditional preparation methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1 In-situ preparation of titanium dioxide / graphene composite nanomaterials

[0019] (1) Add 200 µL of 10 mg·mL -1 Graphene oxide aqueous solution with 200 µL mass fraction is 30 mg·mL -1 The aqueous solution of tannic acid was mixed, ultrasonically oscillated for 5 minutes, and the concentration was 1 mol L with 50 µL -1 The sodium hydroxide solution adjusts the pH to 7;

[0020] (2) Mix the above mixed solution with 26 µL of an aqueous solution of di(2-hydroxypropionic acid) diammonium dihydroxide titanium with a mass fraction of 40%, and vortex for 1 minute to obtain a precursor sol doped with nanomaterials ;

[0021] (3) Drop 20 µL of the precursor sol prepared in step (2) on the ITO conductive glass, place it in a tube furnace after 30 minutes, and heat it up to 140°C at a rate of 3°C / min in a nitrogen atmosphere and then keep it warm 1 to 2 h, then heated up to 400 °C and kept warm for 2 to 3 h, and cooled to room temperature to obtain an ITO electrode ...

Embodiment 2

[0022] Example 2 In-situ preparation of titanium dioxide / ferric oxide composite nanomaterials

[0023] (1) Mix 100 µL of 20 mg·mL -1 100 mg·mL of Fe3O4 nanoparticles aqueous solution with 400 µL mass fraction -1 The dimethyl sulfoxide solution of tannic acid was mixed and ultrasonically oscillated for 5 minutes;

[0024] (2) Mix the above mixed solution with 70 µL of an aqueous solution of bis(2-hydroxypropionic acid) diammonium dihydroxide titanium with a mass fraction of 20%, and vortex for 1 minute to obtain a precursor sol doped with nanomaterials ;

[0025] (3) Drop 20 µL of the precursor sol prepared in step (2) on the ITO conductive glass, place it in a tube furnace after 30 minutes, and heat it up to 140°C at a rate of 3°C / min in a nitrogen atmosphere and then keep it warm 1-2 h, then heated up to 400°C, kept warm for 2-3 h, and cooled to room temperature to obtain an ITO electrode modified with titanium dioxide / ferric oxide composite nanomaterials.

Embodiment 3

[0026] Example 3 Titanium dioxide / carbon nitride composite nanomaterial modified ITO electrode is used to construct a photoelectrochemical sensor for detecting copper ions

[0027] The ITO electrode modified with titanium dioxide / carbon nitride composite nanomaterials was used as the working electrode, immersed in the sample solution containing copper ions for 10 minutes, then the Ag / AgCl electrode was used as the reference electrode, the Pt electrode was used as the counter electrode, and the pH was 7.4 50 mmol·mL prepared in PBS buffer solution -1 The ascorbic acid solution was used as the bottom solution, and the 200w LED lamp was used as the light source, and the photocurrent signal at the potential of 0.2V was measured on the electrochemical workstation in the instant current mode to realize the detection of copper ions.

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PUM

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Abstract

The invention discloses an in-situ biomimetic preparation method and application of a composite titanium dioxide nano material, and relates to the field of nanoscience, material science, electrochemical sensing and the like. The in-situ biomimetic preparation method is characterized in that the composite titanium dioxide nano material is prepared in situ on the surface of a glass electrode by taking supramolecular metallogel formed by gallotannic acid and transition metal ions as precursors. The supramolecular metallogel formed by the gallotannic acid has good load capacity, so that various nano materials can be compounded with titanium dioxide; and in-situ modification, on the surface of the glass electrode, of the composite titanium dioxide nano material has a wide application prospect in the fields such as electrochemical luminescence and photoelectrochemical sensors.

Description

technical field [0001] The invention relates to the fields of nanoscience, material science, electrochemical sensing and the like, in particular to an in-situ biomimetic preparation method and application of a composite titanium dioxide nanomaterial. Background technique [0002] In recent years, photoelectrochemical sensors using light as the excitation signal and photocurrent as the detection signal have received extensive attention in the fields of biological and environmental analysis. Photoelectrochemical sensors combine traditional electrochemical sensors and photoelectrochemical sensors, and have the advantages of both electrochemical and photochemical sensors. The photoelectric layer modified on the electrode surface is excited after absorbing photons, and the generated carriers undergo charge separation and electron migration, thereby generating photocurrent. By using different forms of energy as the excitation signal and detection signal, the excitation and detect...

Claims

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Application Information

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IPC IPC(8): G01N21/76G01N27/30C01G23/053C01G49/08C03C17/00
CPCC01G23/053C01G49/08C03C17/006G01N21/76G01N27/30
Inventor 马洪敏魏琴张勇吴丹王欢庞雪辉胡丽华范大伟杜斌
Owner UNIV OF JINAN
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