Integrated molybdenum single atom array sensors with multichannels for nitrite detection in foods.

Nitrite (NO ₂ ^- ) is present in a variety of foods, but the excessive intake of NO ₂ ^- can indirectly lead to carcinogenic, teratogenic, mutagenicity and other risks to the human body. Therefore, the detection of NO ₂ ^- is crucial for maintaining human health. In this study, an integrated array sensor for NO ₂ ^- detection is developed based on molybdenum single atom material (IMS _Mo-SAC ) using high-resolution electrohydrodynamic (EHD) printing technology. The sensor comprises three components: a printed electrode array, multichannels designed on polydimethylsiloxane (PDMS) and an electronic signal process device with bluetooth. By utilizing Mo-SAC to facilitate electron transfer during the redox reaction, rapid and efficient detection of NO ₂ ^- can be achieved. The sensor has a wide linear range of 0.1 μM-107.8 mM, a low detection limit of 33 nM and a high sensitivity of 0.637 mA ^-1 mM ^-1 cm ^-2 . Furthermore, employing this portable array sensor allows simultaneously measurements of NO ₂ ^- concentrations in six different foods samples with acceptable recovery rates. This array sensor holds great potential for detecting of small molecules in various fields.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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