Novel carbon fiber nanocone electrode as well as preparation method and application thereof

Abstract

The invention discloses a novel carbon fiber nanocone electrode as well as a preparation method and application thereof, belonging to the field of electrochemistry and material science. The novel carbon fiber nanocone electrode comprises a carbon fiber, an electrode lead and a glass capillary tube, wherein the carbon fiber is connected with the electrode lead through a conductive adhesive; the front part, as long as 50-100 microns, of the carbon fiber is etched to be of a needle shape, and the tip end of the needle-shaped part has the diameter of 100nm-300nm; one end of the glass capillary tube is pulled to form a tip end with the diameter less than or equal to 1micron; the carbon fiber connected with the electrode lead penetrates into the pulled tip of the glass capillary tube, and is exposed out of the tip end of the glass capillary tube; the electrode lead is exposed out of the other end of the glass capillary tube, and the end is sealed by an AB adhesive. According to the invention, the problem that after a nano electrode is insulated, the tip end cannot be exposed easily is solved radically. The carbon fiber nanocone electrode provided by the invention has the advantages of low noise, high sensitivity and high temporal-spatial resolution, and can be applied to real-time detection on neurotransmitter in synaptic cleft in neuroscience research.

Description

technical field [0001] The invention belongs to the field of electrochemistry and material science, and relates to a novel carbon fiber nano-cone electrode and its preparation method and application. Background technique [0002] The current methods for constructing nanoelectrodes are generally divided into one-step method and two-step method. The one-step method is to insulate the part other than the tip of the electrode, mainly to pass the etched metal wire through or dip the molten insulating material such as paraffin, glass and other insulating materials. Due to the thick insulating layer, although the prepared nanoelectrode has a small active surface, its geometric size is large, which limits the application of the electrode in the nanoscale range. The two-step method first fully insulates the electrode, and then removes the insulation from the electrode tip by various methods. However, this method is complicated in technology, difficult in operation and poor in repea...

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Problems solved by technology

However, this method is complex in technology, difficult to operate, and the electrode repeatability is not good.

So far, various methods such as chemical and flame etching have been used to fabricate needle-shaped carbon fiber nanoelectrodes, but it is very difficult to insulate the active surface of the electrode and expose the extremely small nanotips.

Although it has been reported in the literature that a variety of methods are used to expose nanoscale tips, there are still problems such as cumbersome operation and difficulty in batch preparation.

The development of a nano-conical electrode with simple fabrication method, easy mass production, excellent electrochemical performance, high temporal and spatial resolution, and can be used for real-time dynamic monitoring of neurotransmitter secretion dynamics in the nanoscale synaptic cleft has won international recognition. No breakthrough yet

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