{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T02:23:44Z","timestamp":1789611824777,"version":"build-2803163510"},"reference-count":45,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2019,3,6]],"date-time":"2019-03-06T00:00:00Z","timestamp":1551830400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100011665","name":"Deanship of Scientific Research, King Saud University","doi-asserted-by":"publisher","award":["RGP-1435-047"],"award-info":[{"award-number":["RGP-1435-047"]}],"id":[{"id":"10.13039\/501100011665","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>Herein, a facile route leading to good single-walled carbon nanotubes (SWCNT) dispersion or poly (3,4-ethylenedioxythiophene)\/poly(styrenesulfonate) (PEDOT\/PSS) based single-piece nanocomposite membrane is proposed for trace determination of Cu2+ ions. The single-piece solid contact Cu2+-selective electrodes were prepared after drop casting the membrane mixture on the glassy-carbon substrates. The prepared potentiometric sensors revealed a Nernstian response slope of 27.8 \u00b1 0.3 and 28.1 \u00b1 0.4 mV\/decade over the linearity range 1.0 \u00d7 10\u22123 to 2.0 \u00d7 10\u22129 and 1.0 \u00d7 10\u22123 to 1.0 \u00d7 10\u22129 M with detection limits of 5.4 \u00d7 10\u221210 and 5.0 \u00d7 10\u221210 M for sensors based on SWCNTs and PEDOT\/PSS, respectively. Excellent long-term potential stability and high hydrophobicity of the nanocomposite membrane are recorded for the prepared sensors due to the inherent high capacitance of SWCNT used as a solid contact material. The sensors exhibited high selectivity for Cu2+ ions at pH 4.5 over other common ions. The sensors were applied for Cu2+ assessment in tap water and different tea samples. The proposed sensors were robust, reliable and considered as appealing sensors for copper (II) detection in different complex matrices.<\/jats:p>","DOI":"10.3390\/molecules24050920","type":"journal-article","created":{"date-parts":[[2019,3,7]],"date-time":"2019-03-07T10:52:22Z","timestamp":1551955942000},"page":"920","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Single-Piece Solid Contact Cu2+-Selective Electrodes Based on a Synthesized Macrocyclic Calix[4]arene Derivative as a Neutral Carrier Ionophore"],"prefix":"10.3390","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1338-706X","authenticated-orcid":false,"given":"Abd El-Galil","family":"E. Amr","sequence":"first","affiliation":[{"name":"Pharmaceutical Chemistry Department, Drug Exploration &amp; Development Chair (DEDC), College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia"},{"name":"Applied Organic Chemistry Department, National Research Centre, Dokki, Cairo 12622, Egypt"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9866-343X","authenticated-orcid":false,"given":"Mohamed A.","family":"Al-Omar","sequence":"additional","affiliation":[{"name":"Pharmaceutical Chemistry Department, Drug Exploration &amp; Development Chair (DEDC), College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7502-6668","authenticated-orcid":false,"given":"Ayman","family":"H. Kamel","sequence":"additional","affiliation":[{"name":"Chemistry Department, Faculty of Science, Ain Shams University, Abbasia, Cairo 11566, Egypt"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4774-4600","authenticated-orcid":false,"given":"Elsayed","family":"A. Elsayed","sequence":"additional","affiliation":[{"name":"Zoology Department, Bioproducts Research Chair, Faculty of Science, King Saud University, Riyadh 11451, Saudi Arabia"},{"name":"Chemistry of Natural and Microbial Products Department, National Research Centre, Dokki, Cairo 12622, Egypt"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2019,3,6]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"542","DOI":"10.1093\/ajcn\/35.3.542","article-title":"Urinary copper losses in infants receiving free amino acid solutions\u200f","volume":"35","author":"Tyrala","year":"1982","journal-title":"Am. J. 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