Scanning probe microscopy of poly-atomic molecules

[摘要] This thesis presents studies on the adsorption of chlorobenzene using STS, non-local desorption of chlorobenzene and the atomic manipulation of the PCB molecule using STM. The atomic manipulation of the mucin molecule on HOPG surfaces under different conditions has also been investigated. Chlorobenzene adsorbate on the Si(111)-(7×7) surface has been investigated using STS. The missing rest atom state at -0.8 V confirmed the rest atom involvement in the bonding geometry. Two adsorbate states located at -1.3 V and +1 to +2 V have been identified. The effect of the surface step and the temperature on the non-local chlorobenzene desorption process has been investigated.Different reactions generated by STM of the PCB molecule on the Si(111)-(7×7) surface have been studied. While molecular desorption is maximized by electron injection into the chemisorbed molecular ring at low voltage, injection into the physisorbed molecular ring at high voltage favours the reconfiguration of the bonding. The mucin molecule has been studied by AFM and STM. An unraveling manipulation has been achieved over a folded mucin polymer on the bare HOPG surface. Enhanced mucin-substrate binding has also been achieved in the liquid state on the size-selected Au55 cluster-decorated HOPG surface.

[发布机构] University:University of Birmingham;Department:School of Physics and Astronomy

[关键词] Q Science;QC Physics