Adulterated Fish Recognition Employing SnO2 Nanostructure-Based Chemiresistive Sensor

The letter reports a flowerlike SnO2 nanostructure-based chemiresistive type formaldehyde sensor to detect formalin adulteration in fish. A low-temperature hydrothermal technique was adopted to prepare the sensing material. The structural and morphological characterizations of the synthesized material were performed using X-ray diffraction (XRD) and a field emission scanning electron microscope (FESEM), respectively. Using a micropipette, the sensing material was drop casted over interdigitated electrodes built on an alumina substrate to fabricate the sensor device. The gas sensing study showed that the sensor was notably sensitive toward formaldehyde. The theoretical limit of detection of the sensor was found to be 870 ppb. The sensing behavior was studied toward the fish emitted vapors, where the sensor offered significant distinction among the fresh and adulterated fish samples.

Automated summary

The letter describes a chemiresistive formaldehyde sensor based on flowerlike SnO2 nanostructure for detecting formalin adulteration in fish. The sensing material was prepared using a low-temperature hydrothermal technique and characterized using XRD and FESEM. The sensor device was fabricated by drop casting the sensing material on interdigitated electrodes built on an alumina substrate using a micropipette. The sensor exhibited notable sensitivity towards formaldehyde with a theoretical limit of detection of 870 ppb. It also demonstrated significant distinction between fresh and adulterated fish samples when exposed to fish-emitted vapors.