Nano-graphitic clustering and break down of phonon selection rule in diamond-like carbon films
✍ Scribed by S. Kataria; Satyaprakash Sahoo; S.A. Barve; S. Dash; D.S. Patil; A.K. Tyagi; A.K. Arora
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 1005 KB
- Volume
- 149
- Category
- Article
- ISSN
- 0038-1098
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✦ Synopsis
Diamond-like carbon films are deposited on silicon substrates at different substrate bias using ECR-CVD technique. Raman spectroscopic studies show the presence of broad G and D peaks. In contrast to the position of D peak, the G peak shows a systematic red-shift with increase in the bias voltage. From the analysis it is found that an increase in bias voltage decreases the sp 2 cluster diameter. Furthermore, two additional Raman peaks at around 690 and 880 cm -1 are also observed. These peaks, forbidden in the first order Raman scattering, arise due to the breakdown of phonon selection rule in graphitic nanoclusters.