Geng Xin, Li Shuwei, Mawella-Vithanage Lalani, Ma Tao, Kilani Mohamed, Wang Bingwen, Ma Lu, Hewa-Rahinduwage Chathuranga C, Shafikova Alina, Nikolla Eranda, Mao Guangzhao, Brock Stephanie L, Zhang Liang, Luo Long
Department of Chemistry, Wayne State University, Detroit, MI, USA.
Center for Combustion Energy, Tsinghua University, Beijing, China.
Nat Commun. 2021 Aug 12;12(1):4895. doi: 10.1038/s41467-021-25192-4.
Atmospheric NO is of great concern due to its adverse effects on human health and the environment, motivating research on NO detection and remediation. Existing low-cost room-temperature NO sensors often suffer from low sensitivity at the ppb level or long recovery times, reflecting the trade-off between sensor response and recovery time. Here, we report an atomically dispersed metal ion strategy to address it. We discover that bimetallic PbCdSe quantum dot (QD) gels containing atomically dispersed Pb ionic sites achieve the optimal combination of strong sensor response and fast recovery, leading to a high-performance room-temperature p-type semiconductor NO sensor as characterized by a combination of ultra-low limit of detection, high sensitivity and stability, fast response and recovery. With the help of theoretical calculations, we reveal the high performance of the PbCdSe QD gel arises from the unique tuning effects of Pb ionic sites on NO binding at their neighboring Cd sites.
大气中的一氧化氮（NO）因其对人类健康和环境的不利影响而备受关注，这推动了对NO检测和修复的研究。现有的低成本室温NO传感器在ppb水平下往往灵敏度较低或恢复时间较长，这反映了传感器响应和恢复时间之间的权衡。在此，我们报告一种原子分散金属离子策略来解决这一问题。我们发现，含有原子分散Pb离子位点的双金属PbCdSe量子点（QD）凝胶实现了强传感器响应和快速恢复的最佳组合，从而得到一种高性能的室温p型半导体NO传感器，其特点是具有超低检测限、高灵敏度和稳定性、快速响应和恢复。借助理论计算，我们揭示了PbCdSe QD凝胶的高性能源于Pb离子位点对其相邻Cd位点处NO结合的独特调节作用。
