Vibrational spectroscopy of diamond films, Langmuir and Langmuir-Blodgett films and aromatic polyethers
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Case Western Reserve University School of Graduate Studies / OhioLINK
1992
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ndltd-OhioLink-oai-etd.ohiolink.edu-case10565535532021-08-03T05:30:45Z Vibrational spectroscopy of diamond films, Langmuir and Langmuir-Blodgett films and aromatic polyethers Yu, Lisha Vibrational spectroscopy diamond films Langmuir Langmuir-Blodgett films aromatic polyethers This dissertation describes a three part research effort on diamond films, monolayers, and polymers. The first part deals with diamond thin films, it directly addresses three closely related subjects. The first subject addresses the surface, interface, and bulk properties of the CVD thin films by using various techniques, such as XPS (X-ray photoelectron spectroscopy), SEM (scanning electron microscopy), FTIR-ATR (Fourier transform infrared-attenuated total reflection), spectra subtraction, and Raman spectroscopy. To the author's best knowledge, the diamond two phonon mode has been observed in a film microns thick for the first time by using FTIR spectra subtraction. The optical contact (between the sample and the prism) problem was overcome, and the FTIR-ATR spectra were obtained. C-H, C=O, and Si-C bondings were also observed. Secondly, a method of measuring the optical constant n and the CVD diamond film thickness on a metallic substrate was used easily without destroying the sample. This method is called FTIR-RAS (reflection absorption spectroscopy). Raman spectroscopy and computer simulations of RAS were also used to help understand and interpret the RAS spectra. Finally, the effect of planar growth defects (stacki ng faults) in diamond films on both Raman and infrared spectra is examined. The empirical formula for the sp2/sp<sup>3</sup> site ratio was experimentally determined by Raman spectroscopy. Preliminary results also show a correlation between the Raman band shape and the morphology of the CVD thin films. The second part of this thesis deals with the Raman spectroscopy of monolayers. The first unperturbed Raman spectrum of a Phthalocyanine monolayer at the air water interface was obtained with a satisfactory signal to noise ratio. Raman spectroscopy was also used to measure the degree of ordering of the monolayers. The last part concerns the synthesis and characterization of aromatic polyethers. The cation radical polymerization of 1,5-bis(1-naphthoxy)-3-oxapentane is a Scholl reaction. This monomer contains a flexible diethylene oxide unit between the two 1-naphthalene rings. The FTIR-DRIFT analysis of the polymers indicates that the polymers contain a 1,4-disubstituted naphthalene structure, i.e. the 4,4′-disubstituted-1,1′-binaphthalene unit. The polymer is semicrystalline with a melting point of 196°C. The resulting polymers have an inherent viscosity up to 0.53 dl/g. 1992 English text Case Western Reserve University School of Graduate Studies / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=case1056553553 http://rave.ohiolink.edu/etdc/view?acc_num=case1056553553 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
| collection |
NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Vibrational spectroscopy diamond films Langmuir Langmuir-Blodgett films aromatic polyethers |
| spellingShingle |
Vibrational spectroscopy diamond films Langmuir Langmuir-Blodgett films aromatic polyethers Yu, Lisha Vibrational spectroscopy of diamond films, Langmuir and Langmuir-Blodgett films and aromatic polyethers |
| author |
Yu, Lisha |
| author_facet |
Yu, Lisha |
| author_sort |
Yu, Lisha |
| title |
Vibrational spectroscopy of diamond films, Langmuir and Langmuir-Blodgett films and aromatic polyethers |
| title_short |
Vibrational spectroscopy of diamond films, Langmuir and Langmuir-Blodgett films and aromatic polyethers |
| title_full |
Vibrational spectroscopy of diamond films, Langmuir and Langmuir-Blodgett films and aromatic polyethers |
| title_fullStr |
Vibrational spectroscopy of diamond films, Langmuir and Langmuir-Blodgett films and aromatic polyethers |
| title_full_unstemmed |
Vibrational spectroscopy of diamond films, Langmuir and Langmuir-Blodgett films and aromatic polyethers |
| title_sort |
vibrational spectroscopy of diamond films, langmuir and langmuir-blodgett films and aromatic polyethers |
| publisher |
Case Western Reserve University School of Graduate Studies / OhioLINK |
| publishDate |
1992 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=case1056553553 |
| work_keys_str_mv |
AT yulisha vibrationalspectroscopyofdiamondfilmslangmuirandlangmuirblodgettfilmsandaromaticpolyethers |
| _version_ |
1719421118149820416 |