CMOS Image Sensor for Rapid Chemical Detection
نویسندگان
چکیده
Toxic chemicals are one of the major global issues due to their adverse effect to human health and biosystems. This present study demonstrated a CMOS image sensor based highly sensitive colorimetric sensing system for the detection various pH ranges (pH1 to 13). For the reaction, pH indicator blended with polyvinyl alcohol (PVA) and titanium (TiO2) nanoparticle; and developed the thin hydrogel films, which was suitable chip to carry out the chemical interaction and detection by CMOS image sensor. Various pH solutions were applied on the hydrogel films, and the chemicals were reacted with pH indicator, and reactions produced the color changes based on their pH range within 30 seconds. Each film produced different color (red to blue) based on their pH range, which is useful to identify the pH range as qualitatively and the color development was quantitatively analyzed by the CMOS image sensor. The CMOS image sensor absorbed the color and displayed the red, green, and blue (RGB) color value as a digital number with the aid of an analog-to-digital converter. The sensor produced the highly sensitive results for each individual pH range based on color developed in the film. This novel method of pH detection will produce an excellent chemical sensor with rapid, cheaper, selective and user-friendly for smart on-site toxic detection.
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