Herein, we synthesized a conjugated microporous polymer (CMP) decorated C₆₀ (CMP@C₆₀) with high photoelectric conversion efficiency, in which continuously repeated donor-acceptor (D-A) π electron unit within one molecule of CMP on C₆₀ could not only effectively increase the mobility of photogenerated carriers with improved electron transmission, but also constitute the cascade energy band matching with reduced electron-hole recombination. Based on the high-performance of CMP@C₆₀ for producing exciting initial photoelectrochemical (PEC) signal, a sensitive signal-off sensing platform was designed for lead ion (Pb²⁺) assay by coupling with quencher methylene blue (MB) interacting on efficient long tailed Y-triangular DNA structure (LYTD). The proposed LYTD with a tripod structure could generate six long tails in situ on its side at the same time via a simple hybridization chain reaction (HCR), providing notably grooves on electrode to accommodate quencher MB to significantly depress the signal for sensitive detection of Pb²⁺. As a result, the proposed PEC biosensor revealed excellent analysis capability with a low detection limit of 0.3 fM (S/N = 3). Additionally, it also showed satisfactory stability in the detection of tap water samples, lake water samples and clinical serum samples, manifesting great application prospect in the areas of environmental pollutant detection.

在此，我们合成了一种具有高光电转换效率的共轭微孔聚合物（CMP）修饰的C ₆₀（CMP@C ₆₀），其中C ₆₀上一个CMP分子内连续重复的供体-受体（DA）π电子单元不仅可以有效提高光生载流子的迁移率，改善电子传输，同时也构成级联能带匹配，减少电子空穴复合。_{基于CMP@C 60}产生令人兴奋的初始光电化学（PEC）信号的高性能，设计了针对铅离子（Pb ²⁺) 通过与猝灭剂亚甲蓝 (MB) 偶联，与有效的长尾 Y 三角 DNA 结构 (LYTD) 相互作用进行测定。所提出的具有三脚架结构的LYTD可以通过简单的杂交链式反应（HCR）在其侧面同时原位产生六个长尾，在电极上提供显着的凹槽以容纳猝灭剂MB以显着抑制信号以灵敏地检测Pb ²⁺。因此，所提出的 PEC 生物传感器显示出出色的分析能力，检测限低至 0.3 fM (S/N = 3)。此外，它在自来水样品、湖水样品和临床血清样品的检测中也表现出良好的稳定性，在环境污染物检测领域显示出巨大的应用前景。