Method for processing microelectrode on PDMS substrate based on inkjet printing technology

Abstract

The invention relates to a method for processing a microelectrode on a PDMS substrate based on an inkjet printing technology. The method comprises: preparing a PDMS substrate, wherein a PDMS monomer and a curing agent are uniformly mixed according to a mass ratio of 10:1, gas bubbles are removed, the PDMS mixed with the curing agent is poured onto the surface of a polished silicon wafer, and the obtained material is placed into a constant temperature oven for 2 h to cure; increasing adhesion of the PDMS on the metal electrode; and carrying out splitting and re-combination on the effective pixel part in the original electrode pattern by using a digital image treatment method, and then carrying out spray printing in a one-by-one manner according to the effective pixel in the new pattern. According to the present invention, the problem of poor electrode continuity caused by the surface tension of the liquid droplet is overcome, the hydrophobic property of the PDMS surface is improved, the processing efficiency is improved, and the poor adhesion of the silver electrode on the PDMS surface is solved; and the method has characteristics of high efficiency, convenience and high automation degree, and the processed electrode has characteristics of good PDMS surface adhesion and high quality.

Description

technical field [0001] The invention relates to a micro-electrode processed on PDMS. In particular, it involves a pixel-level jet printing method and the use of chemical coupling agent MPTMS to modify the surface of PDMS to improve its surface hydrophobicity and adhesion to silver electrodes. Processing microelectrodes on PDMS substrates based on inkjet printing technology Methods. Background technique [0002] Microfluidic chips based on PDMS (polydimethylsiloxane) have been widely used in biomacromolecule detection, electrochemical sensing, medical instrument manufacturing, and wearable devices. As a flexible material, PDMS is the material of choice for manufacturing integrated on-chip sensing systems due to its non-toxicity, transparency, ease of processing, and good biocompatibility. However, integrating microelectrodes in microfluidic channels to form functional biosensors is still a challenge in the scientific community, because processing microelectrodes on PDMS has...

AI Technical Summary

Problems solved by technology

[0005] like Figure 2a , Figure 2b As shown, the surface of PDMS is extremely hydrophobic, resulting in a small droplet diameter, which cannot be dispersed on the substrate, which is not conducive to the evaporation of the droplet solvent, because the working speed of the jet printing system and the droplet distance (by Figure 2a , Figure 2b It can be seen that the smaller droplet diameter needs to be set smaller droplet spacing) is proportional to, so the hydrophobic characteristics of the PDMS surface lead to a longer processing time

[0006] like image 3 as shown, Figure 2a , Figure 2b The problem shown also leads to the formation of larger circular droplets due to surface tension mutual attraction and displacement between adjacent wet droplets, which makes the original printing area appear blank, which is not conducive to the formation of electrodes with better continuity

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