This work presented a ratiometric sensor for hydrogen sulfide (H₂S) based on Cu²⁺-mediated fluorescence of lanthanide coordination polymers (LnCPs) doped with carbon dots (CDs). The ratiometric sensor ([email protected]@GMP/Tb) is fabricated by the self-assembly of terbium ion (Tb³⁺) and guanosine monophosphate (GMP) on the surface of zeolitic imidazolate framework-8 loaded with CDs ([email protected]). In this ratiometric sensor, GMP/Tb moiety was employed as response signal due to the ON-OFF-ON behaviors of Tb³⁺ fluorescence upon the sequential addition of Cu²⁺ and H₂S, while [email protected] served as reference signal because of the good stability of CDs fluorescence in the presence of Cu²⁺ or/and H₂S. The ratiometric sensor can sensitively detect H₂S with a detection limit of 150 nM by fluorescent spectrum method and 3 μM by naked eyes. Owing to the ultrastrong binding ability of H₂S and Cu²⁺, the ratiometric sensor not only exhibits high selectivity to H₂S against other anions, thiols and biological species, which allows detection of H₂S in serum sample with satisfied recovery, but also possesses the distinct feature of reversible sensing. We believe that the present study will provide a new insight into the design and application of LnCPs-based ratiometric fluorescent sensors.

这项工作提出了一种基于Cu ²⁺介导的掺杂有碳点（CDs）的镧系元素配位聚合物（LnCPs）荧光的硫化氢（H ₂ S）比例传感器。比例传感器（[受电子邮件保护] @ GMP / Tb）是通过loaded离子（Tb ³⁺）和鸟苷一磷酸（GMP）在装有CD的咪唑酸盐沸石骨架8的表面上的自组装而制成的（受[电子邮件保护] ]）。在该比例式传感器中，由于在顺序添加Cu ²⁺和H ₂时Tb ³⁺荧光的开-关-开行为，因此GMP / Tb部分用作响应信号S，而[受电子邮件保护]作为参考信号是因为在Cu ²⁺或/和H ₂ S存在下CD荧光具有良好的稳定性。比率传感器可以灵敏地检测H ₂ S，其检测限为150 nM。荧光光谱法和裸眼3μM。由于H ₂ S和Cu ²⁺具有超强的结合能力，该比例传感器不仅对H ₂ S表现出对其他阴离子，硫醇和生物物种的高选择性，因此可以检测H ₂血清样品中的S具有令人满意的回收率，但也具有可逆传感的独特功能。我们相信，本研究将为基于LnCPs的比例荧光传感器的设计和应用提供新的见解。