PEDOT:PSS-coated microchannels: a selective filter for volatile organic compounds

Client: K. N. Toosi University of Technology

Date: 2015-2018

Director project: Prof. Faramarz Hossein-Babaei

Project type: Laboratory implementation

Project collaborator: Dr. Ali Hooshyar Zare

Summary of project:

In this project, a sharply selective filter for volatile organic compounds is designed and fabricated. The device is a microchannel with Poly(3, 4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS)-coated walls which can be used to separate ppm-level contaminations from background gases in a microfluidic circuit. This behavior stems from the physicochemical properties of the surface of the functional coating applied to the channel walls, which are amplified by the physics of the microfluidic channel; the filtering action disappears in large cross-section channels. The coated channel transports hydrogen, carbon monoxide, hexane and benzene similar to the uncoated while effectively blocking both diffusion and drift of methanol and ethanol. Separation factor between n-hexane and ethanol is larger than 103. These microchannels coupled to appropriate sensors can be considered for numerous applications in selective chemical sensing and biomarker detection. At its present configuration, the introduced device can be utilized for detecting low levels of carbon monoxide or benzene in highly alcohol-contaminated background atmosphere.

The fabricated PEDOT:PSS-coated microfluidic channel integrated with a gas sensor


The selective flow of contaminants through the uncoated (a) and PEDOT:PSS-coated microchannels

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