P2AR.1 - Development of Multichannel Interdigitated Capacitor Based Sourness Sensor

17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria
P-2 - Sensor Arrays
R. Rahaman Khan, H. Jeong, S. Kim, J. Kwon, S. Kang - School of Electronics Engineering, Kyungpook National University, Daegu (South Korea)
903 - 903


In our study, we designed and developed a multichannel interdigitated capacitor (IDC) based sourness sensor, that is based on the principle of capacitance variation. Four different types of solvatochromic dyes namely, Nile-red, Reinchardt-dye, (R-dye), auramine-O, and rhodamine-B were individually mixed with polyvinylchloride (PVC) polymer and dimethylacetamide (DMAC) solution to make four different types of sourness sensitive sensing solutions. Thoes solutions were individually inserted into four interdigitated electrodes by a spin coater and dry at the room temperature to get four IDC sourness sensors of the array. In our study, when the IDC sensor comes in to contact with any sour-solution then the dielectric constant of the sensing embrane change, which in turn change the capacitance of IDC sensor. The sensitivity of the sensor was approximately 3 nF/decade. The proposed multichannel IDC sensor can detect sourness of any sour-solution from 1μM to 1M with fast response and recovery time. The response and recovery time of the proposed sensor was approximately 20 s and 23 s, respectively. We compared the sensing performance of the designed multichannel IDC sensor with a potentiometric sensor with respect to dynamic range width, and response time, we found that the proposed IDC sensor has better sensing performance.