77124 20191126134635.0 doi 10.1007/s00604-018-2676-y sideral 104560 ART-2018-104560 eng (orcid)0000-0001-6482-1121 Martín-Barreiro, A. Gold nanoclusters as a quenchable fluorescent probe for sensing oxygen at high temperatures 2018 Access copy available to the general public Unrestricted Gold nanoclusters (AuNCs) capped with lipoic acid (LA) or templated with bovine serum albumin (BSA) are shown to be viable fluorescent probes for oxygen (O2) which acts as a collisional quencher. Quenching of fluorescence, with its lifetimes in the order of 123 ± 9 ns (LA) and 153 ± 15 ns (BSA) (in aqueous solution), is best measured at excitation/emission wavelengths of 400/680 nm and 375/650 nm respectively. It follows the Stern-Volmer model, whose quenching constants (Ksv) and quenching efficiencies (¿) are 1400 M-1 and 0.52 for AuNC@LA and 4479 M-1 and 0.90 for AuNC@BSA. The probes were immobilized on a silica support and tested for response to O2 in gas phase using a commercial instrument. The effect of temperature on the fluorescence of AuNC@LA was studied in the range from 30 to 210 °C. Fluorescence intensity slightly decreases with temperature in the first heating cycle but remains constant in further cycles. The AuNC@LA were studied for their response to O2 in the temperature range from 30 to 100 °C, and even at 100 °C they respond to O2, with a Ksv that slightly drops with increasing temperature. Measuring in gas phase at 100 °C, the sensor has a detection limit of 3% (V/V) of O2 at a signal-to-noise ratio of 3. [Figure not available: see fulltext.]. info:eu-repo/grantAgreement/ES/DGA/E74 info:eu-repo/grantAgreement/ES/MINECO/CTQ2016-76846-R info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 5.479 2018 CHEMISTRY, ANALYTICAL 9 / 84 = 0.107 2018 Q1 T1 1.243 2018 Analytical Chemistry 2018 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion (orcid)0000-0002-7902-6005 Marcos, S. de Universidad de Zaragoza (orcid)0000-0002-8973-5104 Galbán, J. Universidad de Zaragoza 2009 750 Universidad de Zaragoza Dpto. Química Analítica Área Química Analítica 185, 3 (2018), 171 [7 pp] Mikrochim. acta Mikrochimica acta 0026-3672 377735 http://zaguan.unizar.es/record/77124/files/texto_completo.pdf Postprint 9176 http://zaguan.unizar.es/record/77124/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:77124 articulos driver 2019-11-26-13:43:29 ARTICLE