Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, Frontiers Science Center for Materiobiology and Dynamic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China.
Anal Chem. 2023 Feb 21;95(7):3613-3620. doi: 10.1021/acs.analchem.2c04309. Epub 2023 Feb 12.
Understanding the basic physicochemical properties of gas molecules confined within nanobubbles is of fundamental importance for chemical and biological processes. Here, we successfully monitored the nanobubble-confined electrochemical behaviors of single platinum nanoparticles (PtNPs) at a carbon fiber ultramicroelectrode in HClO and HO solution. Due to the catalytic decomposition of HO, a single oxygen nanobubble was formed on individual PtNPs to block the active surface of particles for proton reduction and to suppress their stochastic motion, resulting in significantly distinguished current traces. Furthermore, the combination of theoretical calculations and high-resolution electrochemical measurements allowed the nanobubble size and the oxygen gas density inside a single nanobubble to be quantified. Moreover, the ultrahigh oxygen density inside (1046 kg/m) was revealed, indicating that gas molecules in a nanosized space existed with a high state of aggregation. Our approach sheds light on the gas aggregation behaviors of nanoscale bubbles using single-entity electrochemical measurements.
理解受限在纳米气泡中的气体分子的基本物理化学性质对于化学和生物过程至关重要。在这里，我们成功地在 HClO 和 HO 溶液中在碳纤维超微电极上监测了单个铂纳米粒子 (PtNP) 的纳米气泡限制的电化学行为。由于 HO 的催化分解，单个氧纳米气泡在单个 PtNP 上形成，从而阻止了颗粒的活性表面进行质子还原，并抑制了它们的随机运动，导致电流轨迹明显不同。此外，理论计算和高分辨率电化学测量的结合允许定量纳米气泡的大小和单个纳米气泡内的氧气密度。此外，还揭示了内部超高的氧气密度（1046 kg/m），表明纳米尺寸空间中的气体分子以高聚集状态存在。我们的方法使用单实体电化学测量揭示了纳米气泡中气体聚集行为。
