在Au140(+/0) 纳米颗粒之间的电子自我交换比在固态混合价值薄膜中的Au38(+/0) 之间的电子自我交换更快
1Contribution from the Kenan Laboratories of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290.
Journal of the American Chemical Society
|August 10, 2006
概括
这项研究揭示了金属纳米粒子电子转移动态中的显著尺寸效应. 较小的金纳米粒子 (Au38) 与较大的 (Au140) 相比,由于更高的能量障碍,具有较慢的电子自我交换率.
科学领域:
- 纳米技术 纳米技术
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
背景情况:
- 研究了具有明确电化学特性的金纳米粒子 (Au38和Au140).
- 从这些纳米颗粒的溶液中制备混合价值片,以受控比例.
研究的目的:
- 为了研究混合价值金纳米粒子薄膜中的电子转移动力学.
- 为了确定纳米粒子大小对电子自我交换率的影响.
主要方法:
- 电压测量用于制备具有已知的相对比例的金纳米颗粒溶液.
- 从这些溶液中造出混合价值的片.
- 测量了电子导电和电子自我交换率.
主要成果:
- 混合膜中的电子导电通过双分子电子自我交换发生.
- Au38纳米粒子的速率常数显著较慢 (2 x 10^6 M^-1 s^-1),而不是Au140 (4 x 10^9 M^-1 s^-1).
- 对于Au38电子转移的更高的能量障碍 (约. 20kJ/mol与Au140的7kJ/mol相比) 被确定为速率差异的主要原因.
结论:
- 这项工作证明了金属纳米粒子电子转移动态中第一个显著的尺寸效应.
- 纳米粒子大小极大地影响了电子跳跃导电性.
- 能源障碍和道距离是影响这些系统中电子传输速率的关键因素.
更多相关视频
11:33All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
Published on: January 19, 2018
08:18Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry
Published on: March 4, 2021
相关概念视频
01:19Thomson's e/m Experiment
In a beam of charged particles created by a heated cathode, the particles move at different speeds. However, many applications need a beam with uniform particle speeds. An arrangement known as a velocity selector uses electric and magnetic fields to pick particles with a particular speed from the beam.
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The magnetic...
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The magnetic...
01:30The Electrical Double Layer
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...