Analytical Sciences

PM_2.5 Particle Detection in a Microfluidic Device by Using Ionic Current Sensing

Taisuke SHIMADA,*1,*2 Hirotoshi YASAKI,*1,*2 Takao YASUI,*1,*2,*3 Takeshi YANAGIDA,*4,*5 Noritada KAJI,*6 Masaki KANAI,*4 Kazuki NAGASHIMA,*4 Tomoji KAWAI,*5 and Yoshinobu BABA*1,*2,*7

*1 Department of Biomolecular Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan
*2 ImPACT Research Center for Advanced Nanobiodevices, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan
*3 Japan Science and Technology Agency (JST), PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
*4 Laboratory of Integrated Nanostructure Materials Institute of Materials Chemistry and Engineering, Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan
*5 Institute of Scientific and Industrial Research, Osaka University, Mihogaoka, Ibaraki 567-0047, Osaka, Japan
*6 Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi, Fukuoka 819-0395, Japan
*7 Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Takamatsu 761-0395, Japan

We have demonstrated a PM_2.5 analysis method that adds information on the number concentration and size by using microfluidic-based ionic current sensing with a bridge circuit. The bridge circuit allows for suppression of the background current and the detection of small PM_2.5 particles, even if a relatively large micropore is used. This is the first demonstration of the detection of PM_2.5 particles via ionic current sensing; our method enables analyses of both the number concentration and size.

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