کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1441911 | 1509421 | 2012 | 11 صفحه PDF | دانلود رایگان |
Selected acenes, cyclic acenes and model zigzag (4,0) single wall carbon nanotubes (SWCNTs) with one hydroxylic group at the open end were fully optimized at the B3LYP/6-31G* level of theory. The impact of molecule size on the B3LYP/pcS-2 calculated 13C NMR chemical shifts was studied to characterize pristine and tip-monofunctionalized ultra narrow SWCNTs. The harmonic frequency of Raman radial breathing mode (RBM) was determined for monohydroxylated cyclic acenes and correlated with their diameter. A regular convergence of selected CC bond lengths, RBM frequency and carbon chemical shifts upon increasing the size of the systems was observed and fitted toward very large systems with two-parameter mathematical formula. The observed values of selected structural, Raman and 13C NMR chemical shifts in the studied models point out toward a feasibility of NMR technique as a tool for characterization of pristine and OH functionalized SWCNT materials.
Figure optionsDownload as PowerPoint slideHighlights
► Selected acenes, cyclacenes and zigzag (4,0) single wall carbon nanotubes (SWCNTs).
► OH functionalized at one end optimized using B3LYP/6-31G*.
► The impact of model molecule size on 13C NMR chemical shifts.
► The harmonic frequency of Raman radial breathing mode (RBM).
► RBM in monohydroxylated cyclic acenes correlated with their diameter.
Journal: Synthetic Metals - Volume 162, Issues 7–8, May 2012, Pages 573–583