An ultrasensitive solid-state electrochemiluminescence sensor based on Ni-MOF@Ru(bpy)32+ and Au NPs@TiO2 for determination of permethrin

The novel TiO2 and Ni-MOF materials were synthesized and utilized for the detection of permethrin (PET). A highly sensitive solid-state electrochemiluminescence (ECL) sensor was developed based on Ni-MOF@Ru(bpy)32+ and Au NPs@TiO2. In this sensing platform, Ru(bpy)32+-Tripropyl Amine (TPrA) was used as a luminescent signal, Ni-MOF acted as a carrier to carry more luminescent reagents Ru(bpy)32+. Au NPs acted as promoters facilitated electron transport and TiO2 could further enhance the luminescence intensity of the system by synergistical interaction with Au NPs. The possible mechanisms of signal amplification were investigated. The ECL intensity decreased significantly with increasing PET concentration, enabling the determination of PET amount through the observation of the change in ECL signal intensity (ΔI). Under optimal experimental conditions, the linear range of PET concentration from 1.0 × 10−11 mol L−1 to 1.0 × 10−6 mol L−1, with a detection limit of 3.3 × 10−12 mol L−1 (3S/N). This method was successfully applied to determine PET in various vegetable samples. Ni-MOF can host a higher amount of the luminescent reagent Ru(bpy)32+. Au NPs can facilitate electron transport, TiO2 as a luminescent substance, can with AuNPs to increase the luminescence intensity. [Display omitted] •A solid-state electrochemiluminescent sensor for permethrin detection was developed.•The novel TiO2 and Ni-MOF materials were prepared.•The synergistic effect of Au NPs@TiO2 and Ni-MOF@Ru(bpy)32+ enhanced the ECL signal.•The electrochemiluminescence sensor had good stability and low detection limit.