About: In-situ prepared polyaniline-silver composites: Single- and two-step strategies

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Attributes	Values
rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://dx.doi.org/10.1016/j.electacta.2013.10.001
Description	Conducting polymer-metal composites, such as polyaniline-silver, can efficiently be prepared by two ways: (1) by the oxidation of aniline with silver ions or (2) by the reduction of silver ions with polyaniline. Both approaches yield the composites with limited conductivity. In order to increase the content of silver, and thus increase the conductivity, two strategies are proposed: (1) an increase of oxidant-to-aniline mole ratio in the oxidation of aniline with silver nitrate above stoichiometric value in a single step, and thus reduce excess silver ions to silver metal with produced polyaniline, or (2) in two steps, by preparing polyaniline-silver composite at first and then using polyaniline for the reduction of silver ions. The second approach yields the composites of higher conductivity of the order 100 S cm(-1). The role of aniline oligomers and interfacial barriers is discussed on the basis of UV-vis and FTIR spectra, and on morphology assessment. The changes in conductivity of composites after deprotonation and reprotonation of polyaniline part are also reported. Surprisingly, the conversion of conducting polyaniline salt to a non-conducting polyaniline base may be associated with an increase of composite conductivity. Conducting polymer-metal composites, such as polyaniline-silver, can efficiently be prepared by two ways: (1) by the oxidation of aniline with silver ions or (2) by the reduction of silver ions with polyaniline. Both approaches yield the composites with limited conductivity. In order to increase the content of silver, and thus increase the conductivity, two strategies are proposed: (1) an increase of oxidant-to-aniline mole ratio in the oxidation of aniline with silver nitrate above stoichiometric value in a single step, and thus reduce excess silver ions to silver metal with produced polyaniline, or (2) in two steps, by preparing polyaniline-silver composite at first and then using polyaniline for the reduction of silver ions. The second approach yields the composites of higher conductivity of the order 100 S cm(-1). The role of aniline oligomers and interfacial barriers is discussed on the basis of UV-vis and FTIR spectra, and on morphology assessment. The changes in conductivity of composites after deprotonation and reprotonation of polyaniline part are also reported. Surprisingly, the conversion of conducting polyaniline salt to a non-conducting polyaniline base may be associated with an increase of composite conductivity. (en)
Title	In-situ prepared polyaniline-silver composites: Single- and two-step strategies In-situ prepared polyaniline-silver composites: Single- and two-step strategies (en)
skos:prefLabel	In-situ prepared polyaniline-silver composites: Single- and two-step strategies In-situ prepared polyaniline-silver composites: Single- and two-step strategies (en)
skos:notation	RIV/00216208:11320/14:10282221!RIV15-MSM-11320___
http://linked.open...avai/riv/aktivita	I P
http://linked.open...avai/riv/aktivity	I, P(GA13-00270S)
http://linked.open...iv/cisloPeriodika	March
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Prokeš, Jan
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Karlova v Praze / Matematicko-fyzikální fakulta
http://linked.open...dnocenehoVysledku	22050
http://linked.open...ai/riv/idVysledku	RIV/00216208:11320/14:10282221
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Silver; Polyaniline; Conducting polymer; Composites (en)
http://linked.open.../riv/klicoveSlovo	Conducting polymer Polyaniline Composites Silver
http://linked.open...odStatuVydavatele	GB - Spojené království Velké Británie a Severního Irska
http://linked.open...ontrolniKodProRIV	[9B66835B4835]
http://linked.open...i/riv/nazevZdroje	Electrochimica Acta
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	4 (xsd:int)
http://linked.open...vavai/riv/projekt	Hybrid composites based on conducting polymers
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	122
http://linked.open...iv/tvurceVysledku	Stejskal, Jaroslav Prokeš, Jan Bober, Patrycja Trchova, Miroslava
http://linked.open...ain/vavai/riv/wos	000334007900032
issn	0013-4686
number of pages	8 (xsd:int)
http://bibframe.org/vocab/doi	10.1016/j.electacta.2013.10.001
http://localhost/t...ganizacniJednotka	11320

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