Chloroalkanes have long been a threat to environmental protection and human health, however, rapid and efficient detection of chloroalkanes remains challenging. Herein, 3-dimensional photonics crystals (3-D PCs) based on bimetallic materials of institute lavoisier frameworks-127 (MIL-127, Fe₂M, M = Fe, Ni, Co, Zn) demonstrate the great potential of chloroalkanes sensing. Particularly, at temperature of 25 °C and dry conditions, the 3-D PC consisting of MIL-127 (Fe₂Co) shows optimal selectivity and high concentration sensitivity of 0.0351 ± 0.00007 nm ppm⁻¹ to carbon tetra-chloride (CCl₄), and the limit of detection (LOD) can reach 2.85 ± 0.01 ppm. Meanwhile, MIL-127 (Fe₂Co) 3-D PC sensor presents a rapid response of 1 s and recovery time of 4.5 s for CCl₄ vapor, and can maintain excellent sensing performance under heat-treatment of 200 °C or in the long-term storage (30 days). Mechanism studies indicated that the excellent sensing property derived from the doping of transition metals. Moreover, the moisture-enhanced adsorption of CCl₄ for the MIL-127 (Fe₂Co) 3-D PC sensor is also observed. H₂O molecule can remarkably enhance the adsorption of MIL-127 (Fe₂Co) to CCl₄. The MIL-127 (Fe₂Co) 3-D PC sensor shows the highest concentration sensitivity of 0.146 ± 0.00082 nm ppm⁻¹ to CCl₄ and the lowest limit of detection (LOD) of 685 ± 4 ppb under the pre-adsorption of 75 ppm H₂O. Our results provide an insight for a trace gas detection using metal-organic frameworks (MOFs) in the optical sensing field.

氯代烷烃长期以来一直威胁着环境保护和人类健康，然而，快速有效地检测氯代烷烃仍然具有挑战性。_{在此，基于 lavoisier frameworks-127 (MIL-127, Fe 2} M, M = Fe, Ni, Co, Zn)双金属材料的三维光子晶体 (3-D PC)展示了氯代烷烃传感的巨大潜力。_{特别是，在 25 °C 的温度和干燥条件下，由 MIL-127 (Fe 2} Co)^组成的 3-D PC对四氯化碳 (CCl ₄ ), 检测限 (LOD) 可达 2.85 ± 0.01 ppm。同时，MIL-127（Fe _{2Co) 3-D PC传感器对CCl 4}蒸气具有1秒的快速响应和4.5秒的恢复时间，在200℃的热处理或长期储存（30天）下仍能保持优异的传感性能. 机理研究表明，优异的传感性能源于过渡金属的掺杂。此外，还观察到MIL-127 (Fe _{2 Co) 3-D PC 传感器对 CCl 4}的水分增强吸附。H _{2 O分子可以显着增强MIL-127(Fe 2} Co)对CCl ₄的吸附。MIL-127 (Fe ₂ Co) 3-D PC 传感器对 CCl ₄的最高浓度灵敏度为 0.146 ± 0.00082 nm ppm ^-1_{在 75 ppm H 2} O的预吸附下，最低检测限 (LOD) 为 685 ± 4 ppb。我们的结果为在光学传感领域使用金属有机框架 (MOF) 进行痕量气体检测提供了见解。