Sensitive detection of H2S in the environment with electrochemiluminescence and fluorescence double-mode sensor constructed by Eu2O3@CDs NPs

In this work, an eco-friendly and rapid dual-mode detection method for H 2 S based on europium oxide doped with carbon quantum dots nanocomposites (Eu 2 O 3 @CDs NPs) is proposed. An efficient electrochemiluminescence (ECL) sensor and dual emission ratio type fluorescence (FL) sensor was constructed by Eu 2 O 3 @CDs NPs, which exhibit excellent ECL and FL properties. It successfully realized the precise quantitative detection of H 2 S due to the influence of the sulfion (S 2- ) to resonance energy transfer mechanism in Eu 2 O 3 @CDs NPs and the extremely short response time greatly improves the analysis efficiency. Ultimately, a good linear relationship in the concentration range of 1 pM to 10 mM and 50 nM to 0.5 mM of H 2 S was acquired, respectively, and the detection limit was as low as 0.0537 pM and 4.88 nM (S/N = 3). In addition, both sensors show excellent selectivity, and stability, and provide a novel idea for establishing H 2 S sensors.