In this study, we propose a multichannel interdigitated capacitor (IDC) sensor for detecting the bitterness of coffee. The operating principle of the device is based on the variation in capacitance of a sensing membrane in contact with a bitter solution. Four solvatochromic dyes, namely, Nile red, R...
In this study, we propose a multichannel interdigitated capacitor (IDC) sensor for detecting the bitterness of coffee. The operating principle of the device is based on the variation in capacitance of a sensing membrane in contact with a bitter solution. Four solvatochromic dyes, namely, Nile red, Reichardt's dye, auramine-O, and rhodamine-B, were mixed with polyvinylchloride (PVC) and N,N-dimethylacetamide (DMAC), to create four different types of bitter-sensitive solutions. These solutions were then individually inserted into four interdigitated electrodes (IDEs) using a spin coater, to prepare four distinct IDC sensors. The sensors are capable of detecting bitterness-inducing chemical compounds in any solution, at concentrations of approximately $1{\mu}M$ to 1 M. The sensitivity of the IDC bitterness sensor containing the Reichardt's dye sensing-membrane was approximately 1.58 nF/decade. The multichannel sensor has a response time of approximately 6 s, and an approximate recovery time of 5 s. The proposed sensor offers a stable sensing response and linear sensing performance over a wide measurement range, with a correlation coefficient ($R^2$) of approximately 0.972.
In this study, we propose a multichannel interdigitated capacitor (IDC) sensor for detecting the bitterness of coffee. The operating principle of the device is based on the variation in capacitance of a sensing membrane in contact with a bitter solution. Four solvatochromic dyes, namely, Nile red, Reichardt's dye, auramine-O, and rhodamine-B, were mixed with polyvinylchloride (PVC) and N,N-dimethylacetamide (DMAC), to create four different types of bitter-sensitive solutions. These solutions were then individually inserted into four interdigitated electrodes (IDEs) using a spin coater, to prepare four distinct IDC sensors. The sensors are capable of detecting bitterness-inducing chemical compounds in any solution, at concentrations of approximately $1{\mu}M$ to 1 M. The sensitivity of the IDC bitterness sensor containing the Reichardt's dye sensing-membrane was approximately 1.58 nF/decade. The multichannel sensor has a response time of approximately 6 s, and an approximate recovery time of 5 s. The proposed sensor offers a stable sensing response and linear sensing performance over a wide measurement range, with a correlation coefficient ($R^2$) of approximately 0.972.
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제안 방법
In preliminary tests, we applied reference signals of different frequencies, to observe the sensitivity and linearity of the IDC sensors. These experimental observations indicated that overall, we obtained better sensitivity and linearity responses from the sensors at a frequency of 500 kHz.
In this study, we designed and fabricated a multichannel IDC-based sensor to detect different concentrations of bitterness-inducing chemical compounds in solution. Four solvatochromic dyes, namely Nile red, Reichardt’s dye, auramine-O, and rhodamine-B, were individually mixed with PVC and DMAC, to yield four different kinds of bitter-sensitive dielectric solutions.
In this study, we designed a multichannel interdigitated capacitor (IDC)-based sensor, to detect 1 µM to 1 M concentrations of bitterness-inducing chemical compounds in solution.
대상 데이터
2. The system consists of a sine wave generator, two buffer amplifiers, a constant current source, four IDC bitterness sensors, a peak detector [18], a data acquisition module (NI USB-6216 BNC), and a computer. The sine wave generator produces a signal at a frequency of approximately 500 KHz, which was fed to the input of the constant current source via buffer amplifier-1.
이론/모형
In this study, we designed a multichannel interdigitated capacitor (IDC)-based sensor, to detect 1 µM to 1 M concentrations of bitterness-inducing chemical compounds in solution. The operation of this sensor is based on the capacitance variation principle [10-12]. Four different solvatochromic dyes [16-20] were mixed individually with a polyvinylchloride (PVC) and N,N-dimethylacetamide (DMAC) solution.
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