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2D nano-structured materials
time:2013-07-17 Browse:

Self-assembly is feasible and effective to achieve the controllable construction of surface nanostructures and have showed great application prospects in molecular electronics, surface patterning, molecular and biological sensors, etc. The traditional force driving molecular self-assembly on surface includes van der Waals’ force, hydrogen bond, dipole-dipole interaction, coordination interaction, and so on. However, nanostructures driven by these weak interactions often lack the necessary thermodynamic and chemical stability. On the contrast, nanostructures connected by covalent bond have strong interaction and usually have good stability. In addition, conjugated molecules connected by covalent bond have good electron-transporting properties and have showed great application prospects in molecular electronics. In this thesis, a series of novel nanostructures on solid surface connected by covalent bond were fabricated. By chemical structure design and assembly environment change, the diverse assembly structures can be precisely controlled. Combining scanning tunneling microscopy (STM) experimental data and density functional theory (DFT) calculation,  representative molecules were chosen to study in detail, especially for the influence of chemical structure and environment factors.


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