122nd General Meeting of the KCS

Type Poster Presentation
Area Material Chemistry
Room No. Grand Ballroom
Time 10월 18일 (목요일) 11:00~12:30
Code MAT.P-372
Subject Integration of heater and temperature sensor on paper-based DMF chip by using material inkjet printer
Authors Yunpyo Kim, Veasna Soum, Mary Chuong, Sooyong Park, Oh-Sun Kwon*, Kwanwoo Shin*
Department of Chemistry, Sogang University, Korea
Abstract Integration of heaters and a temperature sensor on top of a digital microfluidic (DMF) paper-based lab-on-a-chip (p-chip) has been performed by using a simple printing technique. Behalf of advantages of printing technique, such as easy, quick and affordable deposition of materials on flexible paper, we can fabricate a film type of micro heater and temperature sensor to achieve an integrated p-chip. Firstly, by using an inkjet printer, Dimatix, silver nanoparticle (AgNP) ink was printed to obtain a rail pattern of guide electrodes, which was used for the dynamic actuation of DMF droplets driven by electrowetting force. Secondly, to provide a heat system on the p-chip surface, the AgNP ink was printed, forming a heat zone, which is composed of a pair of heaters enclosing a temperature sensor. The temperature sensor was a thermocouple type composed of the interfacial junction of overlapped layers of the thermoelectric (TE) material, p-type PEDOT:PSS over the metallic AgNP. The sensor showed a linear response with a Seebeck coefficient of 18.873 V/K in a range of 25 - 80 oC, demonstrating good usage as a self-powered temperature sensor especially for a DMF drop with on-chip monitoring. This micro thin-film heating and sensing system embedded on p-chip enables us to manage not only the heating a droplet easily capable of the endothermic reaction, but also dynamic operations of droplet, such as merging, mixing and transporting. A biochemical experiment will be performed on this integrated heater-sensor DMF chip, promising a stand-alone potable chip for POC device which is an ultimate goal in this research. Keywords: Electrowetting, paper DMF, inkjet printing, Seebeck coefficient, heater, temperature sensor
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