An electrochemiluminescent sensor based on hydrophilic CsPbBr3/TDPA nanocrystals for sensitive detection of nitrobenzene

Abstract

The extreme sensitivity of perovskite nanoparticles to water has seriously hindered their application. At present, all inorganic perovskite nanocrystals (NCs) have received extensive attention due to their excellent photoelectric properties. A highly hydrophilic composite CsPbBr₃/TDPA NCs was synthesized in the presence of oleylamine molecules, which greatly enhanced its water stability. The electrochemiluminescence (ECL) intensity and stability of the composites are much higher than those of single CsPbBr₃ quantum dots (QDs). For the first time, we have developed a sensor for the specific detection of nitrobenzene using the ECL method. It was found that nitrobenzene could significantly enhance the ECL signal of CsPbBr₃/TDPA NCs. The ECL sensor showed a good linear relationship with the concentration of nitrobenzene in the range of 1 mM to 0.1 μM, and the detection limit was as low as 0.05 μM (S/N = 3). This work provides a new idea for the development of nitrobenzene ECL sensors.