Nitrite detection with trapping in rGO/Fe₂O₃ composite based on surface plasmon resonance

Nitrite is a commonly used ingredient in food products despite its known negative impact on human health. Therefore, the development of a reliable and efficient method for detecting NIT is crucial. In this research, we have designed and assessed a Nitrite sensor utilizing rGO/Fe₂O₃ composite materials. Through analysis using field emission scanning electron microscopy and powder X-ray diffraction, we confirmed the successful bonding of Fe₂O₃ nanoparticles to rGO nanosheets. The effectiveness of rGO/Fe₂O₃ sensor in detecting Nitrite was evaluated using surface plasmon resonance, showing a linear response within the range of 0.01–800 μM and a detection limit of 10 nM. Furthermore, the sensor's performance was assessed using Langmuir and SIPS isotherms, as well as tested for interference from other substances. The sensor's stability was monitored over a 15-day period. Finally, the sensor's performance in detecting Nitrite in food samples was validated using HPLC.