Characterization, Doping And Adsorption Study Of Several Exotic Nanocarbons

[n]cycloparaphenylenes are the simplest structural unit of armchair carbon nanotubes, theycan be used as seeds to synthesize highly uniform CNT from bottom-up method. What’s more,[n]CPP are composed of aromatic subunits with radically oriented p orbital, they can supportmobile charge carriers on the delocalized valence and conduction orbital along the chain. As aresult, they may be used as conducting materials in molecular electronics. As a novel porousorganic molecule,[n]CPP may have interesting adsorption performance whose porous sizecan be adjusted through the synthesis of different cycloparaphenylene. Therefore, it is animportant complement to study the properties of [n]CPP to know better about the nano-carbonmaterial science.[12]CPP and [9]CPP were characterized by Raman spectroscopy, FTIR, UV/VISabsorption and fluorescence spectroscopy. Iodine and bromine doped [12]CPP and [9]CPPwere also characterized and compared with the sample without doping. It turned out that therewas almost no change in iodine doped [12]CPP and [9]CPP, but for bromine doped one, thechange was dramatic.[9]CPP is more active than [12]CPP, it formed C-Br bond with bromine.The properties of [n]CPP family were studied and explained through length effect,bending effect, torsion effect and odd/even effect of n. The results showed different peaks inRaman spectroscopy of [n]CPP have different change tendency because different peaks wereaffected by different effects. In UV/VIS adsorption, the strongest adsorption peak of all[n]CPP are localized around339nm despite of n, while the tail of the strongest adsorptionpeak showed blue shift as n getting bigger. Fluorescence emitted by [n]CPP also showed blueshift as n getting bigger.In Situ FTIR technique was used to research the adsorption during [12]CPP absorbedmethanol or ethanol. By analyzing the position of hydrogen bond in methanol I came to aconclusion that there were two stages in the adsorption process: the driving force in the firststage were the interaction between methanol (ethanol) molecule and [12]CPP, and hydrogenbond between methanol (ethanol) molecules; while the second stage was caused by the crystalstructure change in [12]CPP.Surface enhanced Raman scattering was applied to study [4]nanocage and [6]nanocage, because they were very scarce due to the existing synthesis methods. FTIR and fluorescencewere also used to characterize [n]nanocage. The results indicated that Raman andfluorescence of [n]nanocage and [12]CPP were very similar, but UV/VIS showed differenttendency.