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J Nanosci Nanotechnol

Title:		Nanospherical aggregation of isothiouronium-terminated amphiphilic polythiophene: preparation and vapor-phase detection of volatile organic compounds
Author(s):		Ozawa S; Nishiyabu R; Kubo Y;
Address:
Journal Title:		J Nanosci Nanotechnol
Year:		2014
Volume:		14
Issue:		9
Page Number:		6624 - 6631
DOI:		10.1166/jnn.2014.9343
ISSN/ISBN:		1533-4880 (Print) 1533-4880 (Linking)
Abstract:		"Cationic isothiouronium-terminated amphiphilic poly(3-octylthiophene) IPOT has been synthesized by the reaction of bromoethylene-terminated poly(3-octylthiophene) with 1-(2-(2-methoxyethoxy)ethyl)-3-methylthiourea. By performing gel-permeation chromatography analysis, we estimated the number-average molecular weight (M(n)) and the polydispersity index (PDI) to be 1.07 x 10(4) and 1.48, respectively. The incorporation of an isothiouronium unit at the terminal position renders the polymer amphiphilic. Well-dispersed spherical aggregates were formed with increasing H2O content in the THF solution and were characterized by FE-SEM and powder XRD measurements. We thus proposed a core/shell-type micelle with a poly(3-octylthiophene) segment as the core and an isothiouronium segment as the shell, exposing the hydrophilic methoxyethoxy pendant. The change in morphology to a spherical shape led to a bathochromic shift of the absorption band with decreasing fluorescence intensity, enabling us to use it as a fluorimetric 'off-on' sensor for volatile organic compounds (VOCs) where a quick response to THF was observed on the IPOT aggregate-coated TLC plate"
Keywords:		"Chromatography, Thin Layer Fluorometry Isothiuronium/*chemistry Nanostructures/*chemistry Polymers/*chemistry Thiophenes/*chemistry Volatile Organic Compounds/*analysis;"
Notes:		"MedlineOzawa, Shunsuke Nishiyabu, Ryuhei Kubo, Yuji eng 2015/05/01 J Nanosci Nanotechnol. 2014 Sep; 14(9):6624-31. doi: 10.1166/jnn.2014.9343"