응용화학과 > 교육과정 및 세미나 > 세미나 및 학술행사

Accurate defining of carbon nanostructures such as carbon nanotube and graphene is a pivotal step to understand physical properties of such materials and their application. In this lecture, I want to deliver a series of endeavor to define in both ensemble and individual level of carbon nanostructures. By defining carbon nanotubes with surfactant, we were able to separate single chirality and boost quantum efficiency. For this, we developed self-assembled structure of flavin mononucleotide (FMN) onto carbon nanotube. The hydrogen bonding and p-p interactions of FMN makes this self-assembled monolayer onto the carbon nanotubes. In the presence of other surfactant, the FMN assembly is disrupted and replaced without precipitation by a surfactant micelle. The significantly higher affinity of the FMN assembly for (8,6)-SWNT results in an chirality enrichmentⁱ. By changing tail group of FMN with alkyl group, this seamless self-assembled structure is further utilized to produce bright carbon nanotube which leads to quantum yields as high as 20%. Toluene-dispersed, FC12-wrapped nanotubes exhibit an absorption spectrum with ultrasharp peaks (widths of 12 to 25 meV) devoid of the characteristic background absorption of most nanotube dispersionsⁱⁱ. As efforts to understand individual carbon nanostructures, we also developed new Rayleighⁱⁱⁱ and widefield Raman^iv technique. This technique allows us to probe array of carbon nanotube and graphene with high spatial and spectral resolution. With this, we can also probe the interaction between carbon nanotubes precisely. Another ongoing project on large production of graphene nanoribbons will be shortly discussed. These combined methodologies can find many applications such as real-time carbon nanotube growth and regrowth, photovoltaics, ultracapacitor, drug delivery, and biosensors applications.

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