A simple and sensitive approach to monitor the spectrum change during the electrochemiluminescence process and reveal the mutual promotion between g-C3N4 and co-reactant of S2O82

• Published in: Sensors and actuators. B, Chemical Chemical, 2022-06, Vol.360, p.131679, Article 131679
• Main Authors: Ma, Xuemei, Li, Mengmeng, Kang, Qi, Huang, Yuan, Ma, Cheng, Shen, Dazhong
• Format: Article
• Language: English
• Subjects: Bandpass filters; Carbon nitride; Corrected intensity; ECL of co-reactant; ECL spectrum; Electrochemiluminescence; Emitters; Modulation strategy; Mutual promotion; Polynomials; Turntables
• ISSN: 0925-4005; 1873-3077
• DOI: 10.1016/j.snb.2022.131679

Herein, we develop a high sensitive platform which is able to measure the electrochemiluminescence (ECL) spectrum of ultra-weak emitter (eg. S2O82-) and to monitor ECL spectrum change during ECL process. The rapid change in ECL intensity over detection time, which is the main obstacle in ECL spectrum measurement in wavelength scan model, is predicted by a cubic polynomial model based on the intensities in four adjacent indicator channels in a band-pass filter (BPF) turntable and normalized to stable ECL intensity in a measurement period. The potential dependent ECL spectrum of g-C3N4-S2O82- system reveals the mutual promotion in the ECL intensity between the emitter of g-C3N4 and co-reactant of S2O82-. At the g-C3N4 loading of 5.1 μg/cm2, a new ECL peak for S2O82- appeared at the potential of −1.084 V, with the ECL intensity of S2O82- enhanced 691 times and contributed 3.6% to the total ECL intensity of g-C3N4-S2O82- system at this potential. At the potential of −1.284 V, the proportion of the ECL intensity from S2O82- in total ECL intensity is reduced to 0.16%, because the weak-self ECL of g-C3N4 is enhanced 9280-folds with the help from S2O82- (100 mM) as the co-reactant. A filter turntable was placed in the chamber of an electrochemiluminescence (ECL) analyzer to measure the ECL spectrum. The ECL intensity-time curve is conversed to stable ECL intensity according to the intensities in indicator channels. [Display omitted] •Ultra-weak ECL spectrum is measured rapidly by single PMT in wavelength scan model.•Time depended ECL intensity is monitored and converted to stable signal in a period.•The mutual enhancement in ECL between ECL emitter and its co-reactant is reported.