Transducers Science and Technology Group, MESA+ Research Institute for Nanotechnology, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands.
Nanotechnology. 2011 Jul 8;22(27):275201. doi: 10.1088/0957-4484/22/27/275201. Epub 2011 May 20.
We visualized individual quantum dots using a combination of a confining nanochannel and an ultra-sensitive microscope system, equipped with a high numerical aperture lens and a highly sensitive camera. The diffusion coefficients of the confined quantum dots were determined from the experimentally recorded trajectories according to the classical diffusion theory for Brownian motion in two dimensions. The calculated diffusion coefficients were three times smaller than those in bulk solution. These observations confirm and extend the results of Eichmann et al (2008 Langmuir 24 714-21) to smaller particle diameters and more narrow confinement. A detailed analysis shows that the observed reduction in mobility cannot be explained by conventional hydrodynamic theory.
我们使用限制纳米通道和超灵敏显微镜系统组合来可视化单个量子点，该系统配备了高数值孔径透镜和高灵敏度相机。根据二维布朗运动的经典扩散理论，根据实验记录的轨迹确定受限量子点的扩散系数。计算出的扩散系数比在体相溶液中的小三倍。这些观察结果证实并扩展了 Eichmann 等人（2008 Langmuir 24 714-21）的结果，使其适用于更小的粒径和更窄的限制。详细分析表明，观察到的迁移率降低不能用传统的流体力学理论来解释。
