Ma Wei, Ma Hui, Chen Jian-Fu, Peng Yue-Yi, Yang Zhe-Yao, Wang Hai-Feng, Ying Yi-Lun, Tian He, Long Yi-Tao
Key Laboratory for Advanced Materials , Institute of Fine Chemicals , East China University of Science and Technology , Shanghai , P. R. China . Email:
State Key Laboratory of Chemical Engineering Centre for Computational Chemistry , Research Institute of Industrial Catalysis , East China University of Science and Technology , Shanghai , P. R. China.
Chem Sci. 2017 Mar 1;8(3):1854-1861. doi: 10.1039/c6sc04582k. Epub 2016 Dec 12.
Single nanoparticle (NP) electrochemical measurements are widely described, both theoretically and experimentally, as they enable visualization of the electrochemical signal of a single NP that is masked in ensemble measurements. However, investigating the behavior of individual NPs using electrochemical signals remains a significant challenge. Here we report experiments and simulations demonstrating that multiple distinct motion trajectories could be discerned from time-resolved current traces by dynamic Monte Carlo simulations. We show that continuous monitoring and quantification of electrochemical oxidation of individual AgNPs using a low-noise electrochemical measurement platform produce significantly distinguished current traces due to the size-dependent motions of AgNPs. Our findings offer a view of the electrochemical signals of individual NPs that are largely different from that in the literature, and underscore the significance of motion behaviors in single NP electrochemistry.
单纳米颗粒（NP）的电化学测量在理论和实验方面都有广泛的描述，因为它们能够可视化单个NP的电化学信号，而该信号在整体测量中会被掩盖。然而，利用电化学信号研究单个NP的行为仍然是一项重大挑战。在此，我们报告实验和模拟结果，证明通过动态蒙特卡罗模拟可以从时间分辨电流迹线中辨别出多个不同的运动轨迹。我们表明，使用低噪声电化学测量平台对单个AgNP的电化学氧化进行连续监测和定量，由于AgNP的尺寸依赖性运动，会产生明显不同的电流迹线。我们的研究结果提供了一种与文献中截然不同的单个NP电化学信号观点，并强调了单个NP电化学中运动行为的重要性。
