De Luca Oreste, Caruso Tommaso, Grimaldi Ilenia, Policicchio Alfonso, Formoso Vincenzo, Fujii Jun, Vobornik Ivana, Pacilé Daniela, Papagno Marco, Agostino Raffaele Giuseppe
Dipartimento di Fisica, Università della Calabria, 87036, Arcavacata di Rende(CS), Italy. CNR-Nanotec, UoS di Cosenza, Dipartimento di Fisica, Università della Calabria, 87036, Arcavacata di Rende (CS), Italy.
Nanotechnology. 2020 Sep 4;31(36):365603. doi: 10.1088/1361-6528/ab95ba. Epub 2020 May 22.
Porphyrins are a versatile class of molecules, which have attracted attention over the years due to their electronic, optical and biological properties. Self-assembled monolayers of porphyrins were widely studied on metal surfaces in order to understand the supramolecular organization of these molecules, which is a crucial step towards the development of devices starting from the bottom-up approach. This perspective could lead to tailor the interfacial properties of the surface, depending on the specific interaction between the molecular assembly and the metal surface. In this study, we revisit the investigation of the assembly of zinc-tetraphenylporphyrins on Au(111) in order to explore the adsorption of the molecular network on the noble metal substrate. The combined analysis of scanning tunneling microscopy (STM) imaging and core levels photoemission spectroscopy measurements support a peculiar arrangement of the ZnTPP molecular network, with Zn atoms occupying the bridge sites of the Au surface atoms. Furthermore, we prove that, at few-layers coverage, the interaction between the deposited layers allows a relevant molecular mobility of the adlayer, as observed by STM and supported by core levels photoemission analysis.
卟啉是一类用途广泛的分子，多年来因其电子、光学和生物学特性而备受关注。为了理解这些分子的超分子组织，卟啉自组装单分子层在金属表面得到了广泛研究，这是从自下而上的方法开发器件的关键一步。根据分子组装体与金属表面之间的特定相互作用，这种观点可能导致定制表面的界面性质。在本研究中，我们重新审视了四苯基卟啉锌在Au(111)上的组装研究，以探索分子网络在贵金属基底上的吸附。扫描隧道显微镜(STM)成像和芯能级光发射光谱测量的联合分析支持了ZnTPP分子网络的一种特殊排列，其中Zn原子占据Au表面原子的桥位。此外，我们证明，在几层覆盖度下，如STM所观察到的并得到芯能级光发射分析支持的那样，沉积层之间的相互作用使得吸附层具有相当大的分子迁移率。
