Printed Carbon Nanotubes and Conducting Polymer Nanowires for Chemical and Biological Sensing

Orateur : Jin-Woo CHOI (Associate Professor, School of Electrical Engineering and Computer Science)

Nanomaterials including conductive polymer nanowires and carbon nanotubes have recently been widely used in various sensors applications utilizing their unique properties. Printing also becomes an emerging manufacturing technology for mechanics, electronics, sensors, and consumer products. Printed electrodes and conductive traces particularly offer versatility of fabricating low-cost, disposable, and flexible sensors and devices. This presentation will cover the speaker’s recent developments emphasizing application aspects of carbon nanotubes and conductive polymer nanowires for chemical, biological, and medical sensing. Specifically, inkjet printing of carbon nanotubes and conductive polymer nanowires has been used for creating printed electrodes and sensing electrodes. Both multi-walled and singlewalled carbon nanotubes have been tested for printed electrodes in an electrochemical cell. Ink optimization is a key challenge for a reliable printed sensor. Since carbon nanotubes agglomerate in an aqueous solution, dispersion of carbon nanotubes is critical while maintaining a high concentration. Sodium dodecyl sulfate (SDS) acts as a surfactant to disperse carbon nanotubes and reduces surface tension of carbon nanotube ink for printing. Welldispersed carbon nanotube ink helps forming highly conductive electrodes having low sheet resistance. Printing-based rapid and on-demand fabrication enables low-cost electrochemical and chemiresistive sensors on flexible substrates. Materials preparation, sensor development, and characterization will be demonstrated and discussed. Topics including multi-analyte chemical sensing, printed nanowire and nanotube sensors, and polymer MEMS sensors will be covered in the presentation. Finally, the speaker will conclude the presentation with other recent achievements including novel neural stimulators and portable optical detection systems.

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