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Modified silica nanoporous membrane modified electrode, preparation method and application thereof

A technology of silica and nanopores, applied in the direction of nanotechnology, nanotechnology, nanotechnology for sensing, etc., can solve the problems that have not yet been modified, and the research on silica nanoporous electrodes has been reported, reaching The effect of improving detection performance

Active Publication Date: 2019-04-05
东营正诺技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] So far, there has been no report on the use of graphene quantum dots to modify silica nano-porous electrodes.

Method used

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  • Modified silica nanoporous membrane modified electrode, preparation method and application thereof
  • Modified silica nanoporous membrane modified electrode, preparation method and application thereof
  • Modified silica nanoporous membrane modified electrode, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] 1. Preparation of VMSF / ITO electrode and VMSF / Au electrode

[0066] (1) Preparation of VMSF / ITO electrode

[0067] use The VMSF / ITO electrode was prepared on the ITO substrate electrode by the solution growth method.

[0068] (a) Preparation of precursor solution: Add 3.50mmol / L TEOS, 4.39mmol / L CTAB and 0.84mmol / L ammonia water to 100mL water-ethanol solution (v / v, 7:3), and stir for 10min.

[0069] (b) Preparation of VMSF / ITO electrode: Pour the precursor solution into a reactor equipped with a clean ITO electrode, seal the reactor and react at 60 °C for 24 h. After the end, it was rinsed with deionized water, and the obtained electrode was aged at 100°C overnight, and then magnetically stirred in 0.1M HCl-ethanol solution for 10 minutes to obtain a VMSF / ITO electrode.

[0070] (2) Preparation of VMSF / Au electrode

[0071] The VMSF / Au electrode was prepared by using the electrochemical assisted self-assembly method with the gold electrode as the substrate.

[00...

Embodiment 2

[0092] 1. Cu 2+ Establishment of standard curve

[0093] (a) Configure standard solution: configure a series of Cu with pH 5.0 acetic acid-sodium acetate buffer solution 2+ Standard solution, its concentration is 0.01, 0.05, 0.1, 0.2, 0.4, 0.6, 0.8, 1.0, 50, 100, 200, 400, 600, 800, 1000, 1250, 1500nmol / L.

[0094] (b) The GQD@VMSF / ITO electrode prepared in Example 1 was used as the working electrode, the platinum plate electrode was used as the counter electrode, and the saturated silver / silver chloride electrode was used as the reference electrode. The electrode system was placed in the standard solution of copper ions for constant Enrichment at -0.40V for 90s.

[0095] (c) After enrichment, the electrode system was placed in a blank buffer solution with pH 5.0, and the dissolution signal of copper ions was measured by differential pulse voltammetry. The starting potential was -0.40V and the ending potential was 0.15V.

[0096] (d) Establish a standard curve based on the ...

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Abstract

The invention discloses a modified silica nanoporous membrane modified electrode, a preparation method and an application thereof, and belongs to the technical field of novel materials. The preparation method comprises the following steps of: (1) preparing a silica nanoporous membrane having an open pore structure on an electrode substrate; and (2) inserting graphene quantum dots into pores to modify the silica nanopores to prepare the modified silica nanoporous membrane modified electrode by using a electrophoresis method, an electrostatic adsorption method, or a covalent immobilization method. The modified electrode, the preparation method and the application thereof insert small-sized GQDs as a functional block into pores to modify a VMSF electrode to prepare a variety of sensing interfaces. The electrode can realize a pre-enrichment effect on an object to be detected due to the electronegativity of the pores, and the coordination effect on metal ions and the pi-pi stacking action on the dopamine of the graphene quantum dots, so that the detection property of the object to be detected is remarkably improved. The great application prospects are achieved in direct and high-sensitivity electrochemical detection of multiple types of active compositions in complex samples combined with the anti-staining / anti-interference ability of the VMSF.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a modified silicon dioxide nanoporous membrane modified electrode, a preparation method and application thereof. Background technique [0002] With the rapid development and progress of society, people's needs in terms of environment and health have increased significantly. Direct and highly sensitive detection of complex samples is still a difficult point in current analytical chemistry. Electrochemical sensors can be combined with nanomaterial signal amplification technology to achieve high-sensitivity or even ultra-high-sensitivity detection, and the detection is fast, easy to operate, and inexpensive. [0003] Recent studies have shown that the silica nanochannel electrode is prepared by growing a vertically-ordered mesoporous silica-nanochannel film on the surface of the substrate electrode, which can introduce nanochannels into the substrate electrode at the molecula...

Claims

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Application Information

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IPC IPC(8): G01N27/327G01N27/48B82Y15/00B82Y40/00
CPCB82Y15/00B82Y40/00G01N27/3271G01N27/3277G01N27/3278G01N27/48
Inventor 刘吉洋马欣妤黄洁廖敏筠
Owner 东营正诺技术服务有限公司
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