Ostapenko N, Gulbinas V, Augulis R, Boiko A, Chursanova M, Volkov A, Telbiz G. Fluorescence relaxation kinetics of poly(methylphenylsilane) film and nanocomposites.
NANOSCALE RESEARCH LETTERS 2016;
11:185. [PMID:
27067733 PMCID:
PMC4828352 DOI:
10.1186/s11671-016-1368-y]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Accepted: 03/10/2016] [Indexed: 06/05/2023]
Abstract
A comparative study of fluorescence relaxation kinetics of σ-conjugated poly(methylphenylsilane) (PMPS) polymer film and nanocomposites has been performed by ultrafast time-gated fluorescence measurements at various temperatures. Investigations have revealed a fine structure of excitonic σ-σ* band. We attribute this structure to emission from two spatially independent states with different ordering of the polymer chain segments, type gauche and trans conformations. In contrary to a more ordered polymer poly(di-n-hexylsilane), no clear thermochromic transition has been detected in PMPS film; however, the trans band intensity increases with temperature and with excitation wavelength, but it is absent when polymer is incorporated into nanopores of small diameter.
Collapse