3D flexible electrode or 3D flexible catalyst as well as preparation method and application thereof

Abstract

The invention discloses a 3D flexible electrode or a 3D flexible catalyst as well as a preparation method and an application thereof. The preparation method comprises steps as follows: (1) a zinc oxide crystal array grows on carbon fibers; (2) a carbon fiber / zinc oxide@polydopamine composite material is synthesized; (3) a carbon fiber / zinc oxide@polydopamine-precious metal composite material is prepared. The method can further comprise the step as follows: (4) a carbon fiber@nitrogen-doped carbon tube-precious metal composite material is prepared. The whole process design of key preparation processes, the reaction condition of each step and the like are improved, the problems of limited carbon fiber surface area and low loading nanomaterial activity can be effectively solved, the prepared carbon fiber / zinc oxide@polydopamine-precious metal composite material and the prepared carbon fiber@nitrogen-doped carbon tube-precious metal composite material serve as the 3D flexible electrode and the 3D flexible catalyst, have a good catalytic effect and are particularly applicable to detection of reactive oxygen free radicals in cancer cells.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a three-dimensional flexible electrode or a three-dimensional flexible catalyst and their preparation and application. Background technique [0002] Under the market demand for easy portability and miniaturization of commodities, along with the development and innovation of the electronics industry, the electrochemical devices integrated with flexible micro-scales have revolutionized electrochemical sensors. Such products have the ability to enable real-time monitoring of chemical information in vivo and improve its stability. Carbon fiber electrodes can not only meet the special needs of electrode systems in the micron size range, but also meet the requirements of easy portability due to their special flexibility. Specifically, carbon fibers exhibit a promising set of features, such as small size (5–30 μm in diameter), high strength and elastic modulus, good biocompatibilit...

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the object of the present invention is a three-dimensional flexible electrode and its preparation and application, wherein through the overall process design of its key preparation process, the reaction conditions of each step (such as reactant concentration, Reaction time, reaction temperature, etc.) etc. are improved, compared with the prior art, can effectively solve the problem of limited carbon fiber surface area and low activity of loaded nanomaterials. The present invention first forms zinc oxide arrays on the surface of carbon fibers to increase the surface area of ​​carbon fibers. Then polydopamine is coated on the outside of zinc oxide, and precious metal particles are loaded on polydopamine, which greatly improves the loading capacity of carbon fiber; the prepared carbon fiber / zinc oxide@polydopamine-noble metal composite material and carbon fiber@nitrogen doping The carbon tube-noble metal composite material is not only a three-dimensional flexible electrode, but also a three-dimensional flexible catalyst with good catalytic effect, especially suitable for the detection of active oxygen radicals (ie ROS, such as hydrogen peroxide, etc.) in cancer cells; due to the hydrophilicity of polydopamine , noble metal salts will also be uniformly attached to the surface of polydopamine, which can achieve a more efficient catalytic effect; and, since polydopamine is carbonized to form equivalent nitrogen-doped carbon microtubes and carbon nanotubes, it can further improve the three-dimensional Catalytic effect of flexible catalysts (i.e. three-dimensional flexible electrodes)

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