Stepwise Growth of Ruthenium Terpyridine Complexes on Au Surfaces
Stepwise Growth of Ruthenium Terpyridine Complexes on Au Surfaces
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DOI：
10.1021/acs.jpcc.8b12039
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发表时间：
2019-03-21
影响因子：
3.7
通讯作者：
Simon, Ulrich
中科院分区：
文献类型：
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作者：
Peter, Sophia Katharina;Kaulen, Corinna;Simon, Ulrich
在固体表面自组装的单分子膜在光电和纳米电子领域有着广泛的应用。在这里，我们提出了一种新的反应性钌前体，这使我们能够生长自组装膜的钌络合物线上Au表面，即使在室温下。因此，可以通过反应性Ru前体与三联吡啶配体的顺序反应容易地进行Ru络合物线生长，而无需另外需要的苛刻反应条件。随后，我们使用红外反射吸收光谱（IRRAS）和表面增强拉曼光谱（Sers）监测逐步生长。IRRAS和Sers数据与理论光谱的比较，来自密度泛函理论计算，使我们能够验证每个单独的生长步骤的形成。此外，我们使用这些数据来确定相对于Au表面的Ru基分子线的取向。变角椭圆偏振光谱法获得的生长台阶相关的层厚度验证了光谱结果。因此，我们提供了一种室温下的方法来实现钌络合物线生长的基础上的反应性钌前体。
Self-assembled monolayers (SAMs) of ruthenium-based molecular wires on solid surfaces are of great interest for optoelectronic and nanoelectronic applications. Here, we present a novel reactive Ru precursor, which enabled us to grow SAMs of Ru complex wires on Au surfaces even at room temperature. Thus, the Ru complex wire growth can be performed easily by sequential reaction of the reactive Ru precursor with terpyridine ligands without the harsh reaction conditions needed otherwise. Subsequently, we monitored the stepwise growth using infrared reflection absorption spectroscopy (IRRAS) and surface-enhanced Raman spectroscopy (SERS). A comparison of IRRAS and SERS data with theoretical spectra, derived from density functional theory calculations, enabled us to verify the formation of each individual growth step. Furthermore, we used these data to determine the orientation of the Ru-based molecular wires with respect to the Au surface. Growth step-dependent layer thicknesses obtained from variable angle spectroscopic ellipsometry verify the spectroscopic results. Thus, we provide a room-temperature method to realize Ru complex wire growth based on a reactive Ru precursor.