Miethe Jan F, Lübkemann Franziska, Bigall Nadja C, Dorfs Dirk
Institute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover, Hannover, Germany.
Front Chem. 2019 Apr 10;7:207. doi: 10.3389/fchem.2019.00207. eCollection 2019.
The evolution of systems based on nanoparticles as the main component seems to be a self-accelerating process during the last five decades. Hence, an overview across this field gets more and more challenging. It is sometimes rewarding to focus on the fundamental physical phenomenon of the electronic interconnection between the different building blocks of the obtained devices. Therefore, the investigation of charge transport among the utilized particles and their substrate is one of the mandatory steps in the development of semiconductor nanoparticle based devices like e.g., sensors and LEDs. The investigation of the influence of tunneling barriers on the properties of nanoparticle-functionalized surfaces is a challenging task. The different basic influences on the charge transport dynamics are often difficult to separate from each other. Non-invasive and easily viable experiments are still required to resolve the charge distributing mechanisms in the systems. In the presented work, we want to focus on thin and transparent indium tin oxide (ITO) layers covered glass slides since this substrate is frequently utilized in nanoelectronics. CdSe/CdS nanorods (NRs) are applied as an optically addressable probe for the electronic surface states of the conductive glass. The presented experimental design provides the proof of electronic interconnections in ITO coated glass/linker/NR electrodes via easy reproducible functionalization and polishing experiments. UV/Vis absorption and photoluminescence (PL) lifetime measurements revealed changes in the optical properties caused by differences in the charge carrier dynamics between the system. Our work is focused on the modification of charge carrier dynamics due to the application of linker molecules with different functional groups like (3-mercaptopropyl)methoxysilane (MPTMS) and (3-aminopropyl)trimethoxysilane (APTMS). The presented observations are explained with a simple kinetic model.
在过去的五十年里，以纳米颗粒为主要成分的系统的发展似乎是一个自我加速的过程。因此，对这一领域进行全面概述变得越来越具有挑战性。关注所得器件不同组成部分之间电子互连的基本物理现象有时是有意义的。因此，研究所用颗粒与其基底之间的电荷传输是开发基于半导体纳米颗粒的器件（如传感器和发光二极管）的必要步骤之一。研究隧道势垒对纳米颗粒功能化表面性质的影响是一项具有挑战性的任务。对电荷传输动力学的不同基本影响往往难以相互区分。仍需要非侵入性且易于实施的实验来解析系统中的电荷分布机制。在本工作中，我们将重点关注覆盖有薄而透明的氧化铟锡（ITO）层的载玻片，因为这种基底在纳米电子学中经常被使用。CdSe/CdS纳米棒（NRs）被用作导电玻璃电子表面态的光学可寻址探针。所提出的实验设计通过易于重复的功能化和抛光实验，证明了ITO涂层玻璃/连接体/NR电极中的电子互连。紫外/可见吸收和光致发光（PL）寿命测量揭示了由于系统间电荷载流子动力学差异而导致的光学性质变化。我们的工作重点是通过应用具有不同官能团的连接分子（如（3 - 巯基丙基）甲氧基硅烷（MPTMS）和（3 - 氨丙基）三甲氧基硅烷（APTMS））来改变电荷载流子动力学。用一个简单的动力学模型解释了所呈现的观察结果。
