Raman spectroscopy of carbon nanohoops
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چکیده
We present the Raman spectra for [n]Cycloparaphenylenes ([n]CPPs) of different sizes. A plethora of Raman modes are observed in these spectra, including modes that are analogous to those of the carbon nanotubes (CNTs) such as G-band, as well as Raman peaks that are unique for carbon nanohoops. In addition, we have calculated the theoretical Raman spectra of [n]CPPs for n = 4–20 using density functional theory (DFT), which are then compared to the experimental results for the assignment of different modes. The Raman peak positions are seen to be dependent on the size of the nanohoop from both the experimental and the calculated results. 2013 Elsevier Ltd. All rights reserved.
منابع مشابه
Raman-Active Modes of Even-Numbered Cycloparaphenylenes: Comparisons between Experiments and Density Functional Theory (DFT) Calculations with Group Theory Arguments
[6]-, [8]-, [10]-, and [12]cycloparaphenylenes (CPPs), the smallest even-numbered carbon nanohoops synthesized to date, are probed by Raman spectroscopy. For the highly symmetric even [n]CPPs, group theory predicts that there are 133 Raman-active modes in total for n ≥ 8, 73 for [6]CPP, and 100 for [4]CPP. The Raman-active modes of these even-numbered CPPs are identified by comparing experiment...
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تاریخ انتشار 2013