{"id":{"repo_id":"aachen","oai_identifier":"oai:publications.rwth-aachen.de:59901"},"canonical_url":"https://search.dev.ndltd.org/etd/aachen/oai:publications.rwth-aachen.de:59901","repository":{"repo_id":"aachen","name":"RWTH Aachen University","base_url":"https://publications.rwth-aachen.de/oai2d"},"display":{"title":"Poly-N-vinylamid-modifizierte Elektrode als Komponente eines spektroelektrochemischen Sensors für Catecholderivate","abstract":"A series of poly(N-vinyl amide) copolymers have been synthesised by radical polymerisation from N-vinylpyrrolidone (NVP) and N-vinylphthalimide (NVPH). The suitability of the copolymers for a permselective membrane for a spectroelectrochemical sensor was studied with the goal to detect catechol derivatives. A copolymer with a NVP-NVPH ratio of 3:1 exhibited the required balance of hydrophobic and hydrophilic behaviour. The copolymer was transparent to wavelengths > 300 nm. The copolymer was applied to electrodes of different materials (glassy carbon, graphite, indium tin oxide) using the spin-coating method. The copolymer adhered well to all tested materials. The resulting films were water-insoluble, flexible, colourless and thin. The film thickness was 400 – 700 nm. From the tested catechol derivatives, caffeic acid proved to be an adequate model compound for the poly(N-vinyl amide) modified spectroelectrochemical sensor. The electrochemically derived quinone of caffeic acid was detected by its pi-pi* transition at 400 nm. The hydrophobic caffeic acid was pre-concentrated in the copolymerfilm. At pH 1 the limit of detection was 25 µM for the electrochemical signal and 250 µM for the optical signal. Both detection modes exhibited a linear behaviour up to 1 mM. For the hydrophilic ferrocyanide, the copolymer film acted at pH 1 as a partial diffusion barrier and at pH 7.4 as a complete diffusion barrier. The selectivity of the copolymer was mainly based on hydrophobic interactions and the formation of hydrogen bonds rather than on electrostatic interactions.","abstract_html":"A series of poly(N-vinyl amide) copolymers have been synthesised by radical polymerisation from N-vinylpyrrolidone (NVP) and N-vinylphthalimide (NVPH). The suitability of the copolymers for a permselective membrane for a spectroelectrochemical sensor was studied with the goal to detect catechol derivatives. A copolymer with a NVP-NVPH ratio of 3:1 exhibited the required balance of hydrophobic and hydrophilic behaviour. The copolymer was transparent to wavelengths > 300 nm. The copolymer was applied to electrodes of different materials (glassy carbon, graphite, indium tin oxide) using the spin-coating method. The copolymer adhered well to all tested materials. The resulting films were water-insoluble, flexible, colourless and thin. The film thickness was 400 – 700 nm. From the tested catechol derivatives, caffeic acid proved to be an adequate model compound for the poly(N-vinyl amide) modified spectroelectrochemical sensor. The electrochemically derived quinone of caffeic acid was detected by its pi-pi* transition at 400 nm. The hydrophobic caffeic acid was pre-concentrated in the copolymerfilm. At pH 1 the limit of detection was 25 µM for the electrochemical signal and 250 µM for the optical signal. Both detection modes exhibited a linear behaviour up to 1 mM. For the hydrophilic ferrocyanide, the copolymer film acted at pH 1 as a partial diffusion barrier and at pH 7.4 as a complete diffusion barrier. The selectivity of the copolymer was mainly based on hydrophobic interactions and the formation of hydrogen bonds rather than on electrostatic interactions.","abstract_has_math":false,"creators":["Renner, Karin"],"institution":"Publikationsserver der RWTH Aachen University","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Schäffer, Andreas"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2005,"date_issued":"2005","date_published":"2005","updated_at":"2026-07-30T19:42:48Z","subjects":["info:eu-repo/classification/ddc/540","Optischer Sensor","Elektrochemischer Sensor","Elektrode","Modifizierung","Polyvinylamide","Copolymere","Brenzcatechinderivate","Chemische Analyse","Chemie","N-Vinylpyrrolidon","N-Vinylphthalimid","Dopamin","Kaffeesäure","Spektroelektrochemie","Elektrochemie","polymermodifizierte Elektrode","ITO"],"languages":["ger"],"rights":["info:eu-repo/semantics/openAccess"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-121642%22"],"render_values":[{"text":"https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-121642%22","href":"https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-121642%22","code":true}]}]},"links":{"outbound_url":"https://publications.rwth-aachen.de/record/59901","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Schäffer, Andreas"]},{"key":"dc:creator","label":"Author","values":["Renner, Karin"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:coverage","label":"Dc Coverage","values":["DE"]},{"key":"dc:date","label":"Dc Date","values":["2005"]},{"key":"dc:publisher","label":"Institution","values":["Publikationsserver der RWTH Aachen University"]},{"key":"dc:relation","label":"Dc Relation","values":["info:eu-repo/semantics/altIdentifier/urn/urn:nbn:de:hbz:82-20050773"]},{"key":"dc:type","label":"Dc Type","values":["info:eu-repo/semantics/doctoralThesis","info:eu-repo/semantics/publishedVersion"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["info:eu-repo/classification/ddc/540","Optischer Sensor","Elektrochemischer Sensor","Elektrode","Modifizierung","Polyvinylamide","Copolymere","Brenzcatechinderivate","Chemische Analyse","Chemie","N-Vinylpyrrolidon","N-Vinylphthalimid","Dopamin","Kaffeesäure","Spektroelektrochemie","Elektrochemie","polymermodifizierte Elektrode","ITO"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["ger"]},{"key":"dc:rights","label":"Dc Rights","values":["info:eu-repo/semantics/openAccess"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://publications.rwth-aachen.de/record/59901","https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-121642%22"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["A series of poly(N-vinyl amide) copolymers have been synthesised by radical polymerisation from N-vinylpyrrolidone (NVP) and N-vinylphthalimide (NVPH). The suitability of the copolymers for a permselective membrane for a spectroelectrochemical sensor was studied with the goal to detect catechol derivatives. A copolymer with a NVP-NVPH ratio of 3:1 exhibited the required balance of hydrophobic and hydrophilic behaviour. The copolymer was transparent to wavelengths > 300 nm. The copolymer was applied to electrodes of different materials (glassy carbon, graphite, indium tin oxide) using the spin-coating method. The copolymer adhered well to all tested materials. The resulting films were water-insoluble, flexible, colourless and thin. The film thickness was 400 – 700 nm. From the tested catechol derivatives, caffeic acid proved to be an adequate model compound for the poly(N-vinyl amide) modified spectroelectrochemical sensor. The electrochemically derived quinone of caffeic acid was detected by its pi-pi* transition at 400 nm. The hydrophobic caffeic acid was pre-concentrated in the copolymerfilm. At pH 1 the limit of detection was 25 µM for the electrochemical signal and 250 µM for the optical signal. Both detection modes exhibited a linear behaviour up to 1 mM. For the hydrophilic ferrocyanide, the copolymer film acted at pH 1 as a partial diffusion barrier and at pH 7.4 as a complete diffusion barrier. The selectivity of the copolymer was mainly based on hydrophobic interactions and the formation of hydrogen bonds rather than on electrostatic interactions."]},{"key":"dc:source","label":"Dc Source","values":["Aachen : Publikationsserver der RWTH Aachen University VI, 139 S. : graph. Darst. (2005). = Aachen, Techn. Hochsch., Diss., 2005"]},{"key":"dc:title","label":"Title","values":["Poly-N-vinylamid-modifizierte Elektrode als Komponente eines spektroelektrochemischen Sensors für Catecholderivate"]}]}],"canonical_facts":{"dc:contributor":["Schäffer, Andreas"],"dc:coverage":["DE"],"dc:creator":["Renner, Karin"],"dc:date":["2005"],"dc:description":["A series of poly(N-vinyl amide) copolymers have been synthesised by radical polymerisation from N-vinylpyrrolidone (NVP) and N-vinylphthalimide (NVPH). The suitability of the copolymers for a permselective membrane for a spectroelectrochemical sensor was studied with the goal to detect catechol derivatives. A copolymer with a NVP-NVPH ratio of 3:1 exhibited the required balance of hydrophobic and hydrophilic behaviour. The copolymer was transparent to wavelengths > 300 nm. The copolymer was applied to electrodes of different materials (glassy carbon, graphite, indium tin oxide) using the spin-coating method. The copolymer adhered well to all tested materials. The resulting films were water-insoluble, flexible, colourless and thin. The film thickness was 400 – 700 nm. From the tested catechol derivatives, caffeic acid proved to be an adequate model compound for the poly(N-vinyl amide) modified spectroelectrochemical sensor. The electrochemically derived quinone of caffeic acid was detected by its pi-pi* transition at 400 nm. The hydrophobic caffeic acid was pre-concentrated in the copolymerfilm. At pH 1 the limit of detection was 25 µM for the electrochemical signal and 250 µM for the optical signal. Both detection modes exhibited a linear behaviour up to 1 mM. For the hydrophilic ferrocyanide, the copolymer film acted at pH 1 as a partial diffusion barrier and at pH 7.4 as a complete diffusion barrier. The selectivity of the copolymer was mainly based on hydrophobic interactions and the formation of hydrogen bonds rather than on electrostatic interactions."],"dc:identifier":["https://publications.rwth-aachen.de/record/59901","https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-121642%22"],"dc:language":["ger"],"dc:publisher":["Publikationsserver der RWTH Aachen University"],"dc:relation":["info:eu-repo/semantics/altIdentifier/urn/urn:nbn:de:hbz:82-20050773"],"dc:rights":["info:eu-repo/semantics/openAccess"],"dc:source":["Aachen : Publikationsserver der RWTH Aachen University VI, 139 S. : graph. Darst. (2005). = Aachen, Techn. Hochsch., Diss., 2005"],"dc:subject":["info:eu-repo/classification/ddc/540","Optischer Sensor","Elektrochemischer Sensor","Elektrode","Modifizierung","Polyvinylamide","Copolymere","Brenzcatechinderivate","Chemische Analyse","Chemie","N-Vinylpyrrolidon","N-Vinylphthalimid","Dopamin","Kaffeesäure","Spektroelektrochemie","Elektrochemie","polymermodifizierte Elektrode","ITO"],"dc:title":["Poly-N-vinylamid-modifizierte Elektrode als Komponente eines spektroelektrochemischen Sensors für Catecholderivate"],"dc:type":["info:eu-repo/semantics/doctoralThesis","info:eu-repo/semantics/publishedVersion"]},"updated_at":"2026-07-30T19:42:48Z"}