Platinum diselenide (PtSe₂) mediated heterostructure based SPR sensor for the detection of formalin: a theoretical analysis

Abstract Formalin adulteration and mixing is a serious problem in tropical countries because of its adverse impact on human health. In current study, SPR based sensor is designed and modelled analytically to achieve the maximum sensitivity with good selectivity. To achieve this, a heterostructure of (BP/PtSe 2 /BP) in SPR sensor has played significant role to enhance the sensor performance due to their better charge carrier confinement and high charge carrier transfer efficiency to metal interface. Analysed designs ensures the maximum sensitivity of 273.05 °/RIU and detection accuracy of 0.204 /°. Distribution of electric field is also estimated to analyse the field enhancement at the interfaces of several material layers. Penetration depth (PD) of 190.94 nm indicating distance between positions from peak field intensity to 37% strength of the maximum electric field intensity is achieved. The proposed sensor demonstrates the potential for detection of formalin in food industry.