Effect of Disorder on the Optical Spectra of Polygermane Films and Nanocomposites

• Published in: Molecular crystals and liquid crystals (Philadelphia, Pa. : 2003) Vol. 497; no. 1; pp. 20/[352] - 29/[361]
• Main Authors: Ostapenko, N., Kozlova, N., Suto, S., Nanjo, M., Mochida, K.
• Format: Journal Article
• Language: English
• Published: Taylor & Francis Group 01.01.2008
• Subjects: mesoporous silica; nanocomposites; optical spectra; poly(di-n-hexylgermane); poly(di-n-hexylsilane)
• ISSN: 1542-1406; 1563-5287; 1543-5318
• DOI: 10.1080/15421400802458209

The fluorescence and fluorescence excitation spectra, as well as the absorption spectra of a poly(di-n-hexylgermane) film and a nano-sized polymer confined into nanopores of SBA-15 with pore diameters of 6 and 10 nm, were measured in the temperature range from 5 to 250 K. The observed data were compared with those obtained for poly(di-n-hexylsilane). The optical spectra of nano-sized poly(di-n-hexylgermane) differ significantly from those of a bulk film and depend on the pore diameters. These spectra correspond to the polymer chains with even less ordered segments and interchain aggregates. This is confirmed by the absence of the thermochromic transition in the composites contrary to the film. The poly(di-n-hexylgermane) polymer chain conformation in the restricted pore volume becomes disordered with a decrease of the nanopore size from 10 to 6 nm.