Raman Analysis of trans-Polyacetylene Chains in Hydrogenated Amorphous Carbon Films

概要

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Hydrogenated amorphous carbon (a-C:H) films were deposited using a RF magnetron sputtering system in H2/He plasma. The bonding hydrogen concentration ($n_{\text{H}}$), optical gap, hardness and Raman spectrum of these a-C:H films were measured. Two significant peaks centered at ${\sim}1150$ and ${\sim}1450$ cm-1 were observed in the Raman spectra of the a-C:H films with a high $n_{\text{H}}$. The two Raman peaks are attributed to the vibration modes of trans-polyacetylene (trans-PA), and the ${\sim}1150$ cm-1 peak is used to analyze the trans-PA chaining configuration. As a result, it is found that as the $n_{\text{H}}$ increases, the relative intensity of this peak increases and its peak position downshifts. These results indicate that the trans-PA chain content and its conjugate length increase with $n_{\text{H}}$. In this paper, we show that the chaining configuration of the a-C:H films can be analyzed using the ${\sim}1150$ cm-1 peak in the Raman spectrum.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2007-02-15