Direct Measurements of the Interaction between Pyrene and Graphite in Aqueous Media by Single Molecule Force Spectroscopy: Understanding the π−π Interactions
2007; American Chemical Society; Volume: 23; Issue: 15 Linguagem: Inglês
10.1021/la700876d
ISSN1520-5827
AutoresYiheng Zhang, Chuanjun Liu, Weiqing Shi, Zhiqiang Wang, Liming Dai, Xi Zhang,
Tópico(s)Mechanical and Optical Resonators
ResumoPyrene derivatives can absorb onto the surface of carbon nanotubes and graphite particles through pi-pi interactions to functionalize these inorganic building blocks with organic surface moieties. Using single molecule force spectroscopy, we have demonstrated the first direct measurement of the interaction between pyrene and a graphite surface. In particular, we have connected a pyrene molecule onto an AFM tip via a flexible poly(ethylene glycol) (PEG) chain to ensure the formation of a molecular bridge. The pi-pi interaction between pyrene and graphite is thus indicated to be approximately 55 pN with no hysteresis between the desorption and adhesion forces.
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