Gold nano particle-titanium dioxide nano wire array composite material as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of photoelectrochemical sensors, and in particular relates to a gold nano particle-titanium dioxide nano wire array composite material as well as a preparation method and application thereof. The preparation method comprises the steps of adjusting the hydrolysis reaction rate through concentrated hydrochloric acid, wherien tetra-n-butyl titanate is taken as a titanium source and water is taken as a solvent under a hydrothermal system, and growing a titanium dioxide nano wire array on an FTO conductive glass-containing substrate; immersing the titanium dioxide nano wire array in a chloroauric acid solution, and heating and roasting the titanium dioxide nano wire array in air to obtain a gold nano particle-titanium dioxide nano wire composite structure; and performing chemical group and specific acceptor modification on the surfaces of gold nano particles to obtain the gold nano particle-titanium dioxide nano wire composite material. The composite material can be used for performing high-sensitivity bacterial toxin detection. The prepared photoelectrochemical sensor is low in cost, high in stability, high in photoelectric conversion efficiency and suitable for large-area production.

Description

technical field [0001] The invention belongs to the technical field of photoelectrochemical sensors, and in particular relates to a gold nanoparticle-titanium dioxide nanowire array composite material and its preparation method and application. Background technique [0002] Highly sensitive detection of chemical substances and biomolecules is of great significance in biomedicine, early disease diagnosis, rapid drug screening and biosafety. The key to high-sensitivity detection lies in the specific identification of the molecule to be tested and the establishment of an effective signal generation and transformation system. In recent years, in order to realize rapid, high-sensitivity, large-scale and low-cost biochemical detection, many optical, electrical and mechanical detection and analysis methods have been greatly developed. Among these methods of analysis and detection, the photoelectrochemical sensor represents a unique signal transduction mode, which combines photoele...

AI Technical Summary

Problems solved by technology

However, titanium dioxide is a wide-bandgap semiconductor (band gap of 3.2 eV), which mainly absorbs ultraviolet light. In addition, it also has the disadvantages of short lifetime of photogenerated electron-hole pairs and low quantum efficiency of photocatalytic process.

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