Synthesis of Mesoporous Aromatic Silica Thin Films and Their Optical Properties

Autor:	Yasutomo Goto, Toyoshi Shimada, Shinji Inagaki, Norihiro Mizoshita, Tadashi Okada, Takao Tani, Osamu Ohtani
Rok vydání:	2008
Předmět:	Materials science Absorption spectroscopy General Chemical Engineering Quantum yield General Chemistry Excimer Photochemistry Mesoporous organosilica Excited state Materials Chemistry Organic chemistry Thin film Ground state Mesoporous material
Zdroj:	Chemistry of Materials. 20:4495-4498
ISSN:	1520-5002 0897-4756
DOI:	10.1021/cm800492s
Popis:	Various aromatic-bridged periodic mesoporous organosilica (PMO) thin films were prepared from 100% organosilane precursors containing bridging organics of 1,4-phenylene (Ph), 4,4′-biphenylylene (Bp), 2,6-naphthylene (Nph), and 9,10-anthrylene (Ant) by an evaporation-induced self-assembly approach. Structural and optical properties of the films were characterized. Transparent films with periodic mesostructures were successfully obtained for all the compositions. The absorption spectra of the PMO films were similar to those of their precursors, indicating little interaction between the aromatic groups in the frameworks in the ground state, whereas the fluorescence spectra of the PMO films significantly red-shifted and also broadened compared with those of their precursors, suggesting excimer formation in the excited state. The quantum yields of the Ph-, Nph-, and Ant-PMO films were lower than those of their precursors by solid-state quenching. Exceptionally, the quantum yield increased above that of the pre...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3a9f663c101c6c04da0135db5bdd17be https://doi.org/10.1021/cm800492s Zobrazit plný text záznamu