Lecture Alexandr Marchenko---CANCELLED
|29 november 2004||FWN-Building 5113.0202, Nijenborgh 4, 9747 AG, Groningen|
|Affiliation:||L.R.C. Semi-conducteurs organiques, DSM/DRECAM/SPCSI, CEA-Saclay, Gif-sur-Yvette, France|
|Title:||Scanning tunneling microscopy of organic molecules in liquid-solid interfaces|
|Date:||Mon Nov 29, 2004|
|Host:||P. Rudolf / I. Arfaoui|
|Telephone:||+31 50 363 4736 / 4705|
Due to the recent events in Ukrain, this seminar has been postponed to a date to be announced.
Self-assembled monolayers (SAMs) of organic molecules on atomically flat surfaces have attracted great interest over the last decade in view of both the theoretical aspects and the potential applications. Since the discovery of scanning tunneling microscopy (STM) this method has been a unique tool for the investigations of such systems with molecule resolution in ultra-high vacuum. An alternative to vacuum deposition in the preparation of well-defined molecular architectures is based on self-assembly of molecules at the liquid-solid interface under ambient conditions. In this talk we present the systematic comparative STM study of different nanostructured molecular self-assemblies at the liquid/Au(111) and liquid/graphite interface. We show that Au(111) and graphite surfaces modified by organic template can serve as new subtrates for formation of new organic SAM's.
Investigated molecules: -
- long n-alkanes, CnH2n+2 (n = 10 - 50);
- discotic liquid crystals (triphenylenes, hexabenzocoronenes, triazaternaphtylenes);
- trimethylsilyl-acetylene derivatives (as alternative to thiole SAM's);
- fullerenes, C60 and C70.
The results of observation of phase transitions, single-molecule and single-nanocluster manipulations will be presented. The observed structures are discussed in terms of commensurability and interfacial interactions.
|Laatst gewijzigd:||22 oktober 2012 14:30|