Hydrogen bonds and two dimensional materials investigated using noncontact atomic force microscopy

Speaker: 
Bingkai Yuan, China Academy of Engineering Physics
Event Date and Time: 
Wed, 2015-08-05 14:00 - 15:00
Location: 
AMPEL 311
Local Contact: 
Sarah Burke
Intended Audience: 
Graduate

 

Noncontact atomic force microscopy (NC-AFM) and scanning tunneling microscopy based on qPlus sensor were used to investigate the intermolecular hydrogen bonding (H-bonding) interaction and the structure of two dimensional materials on metal substrates. Using NC-AFM and CO functionalized tips, a real-space identification of the H-bonding interaction between molecules adsorbed on metal substrate was demonstrated. Through the imaging of heterocyclic skeleton and the intermolecular H-bonds, the different tautomers of guanine and the corresponding H-bonding networks were determined. For the water clusters on Cu(111) surface, small to medium sized clusters, including non-cyclic multimers and large clusters with a cyclic polygonal center, were identified. Through the combined atomic resolved image and site-specific force spectroscopy, the boron, nitride and carbon atoms were distinguished and the structure of in-plane hexagonal graphene-boron nitride (h-BN) interface and the defects in (h-BN) were determined. Finally, we identified the adsorption configurations of non-planar molecules on metal surfaces and measured the dipole directions above individual molecules with different configurations using a combined NC-AFM and Kelvin probe force spectroscopy. 

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