000077124 001__ 77124
000077124 005__ 20191126134635.0
000077124 0247_ $$2doi$$a10.1007/s00604-018-2676-y
000077124 0248_ $$2sideral$$a104560
000077124 037__ $$aART-2018-104560
000077124 041__ $$aeng
000077124 100__ $$0(orcid)0000-0001-6482-1121$$aMartín-Barreiro, A.
000077124 245__ $$aGold nanoclusters as a quenchable fluorescent probe for sensing oxygen at high temperatures
000077124 260__ $$c2018
000077124 5060_ $$aAccess copy available to the general public$$fUnrestricted
000077124 5203_ $$aGold nanoclusters (AuNCs) capped with lipoic acid (LA) or templated with bovine serum albumin (BSA) are shown to be viable fluorescent probes for oxygen (O2) which acts as a collisional quencher. Quenching of fluorescence, with its lifetimes in the order of 123 ± 9 ns (LA) and 153 ± 15 ns (BSA) (in aqueous solution), is best measured at excitation/emission wavelengths of 400/680 nm and 375/650 nm respectively. It follows the Stern-Volmer model, whose quenching constants (Ksv) and quenching efficiencies (¿) are 1400 M-1 and 0.52 for AuNC@LA and 4479 M-1 and 0.90 for AuNC@BSA. The probes were immobilized on a silica support and tested for response to O2 in gas phase using a commercial instrument. The effect of temperature on the fluorescence of AuNC@LA was studied in the range from 30 to 210 °C. Fluorescence intensity slightly decreases with temperature in the first heating cycle but remains constant in further cycles. The AuNC@LA were studied for their response to O2 in the temperature range from 30 to 100 °C, and even at 100 °C they respond to O2, with a Ksv that slightly drops with increasing temperature. Measuring in gas phase at 100 °C, the sensor has a detection limit of 3% (V/V) of O2 at a signal-to-noise ratio of 3. [Figure not available: see fulltext.].
000077124 536__ $$9info:eu-repo/grantAgreement/ES/DGA/E74$$9info:eu-repo/grantAgreement/ES/MINECO/CTQ2016-76846-R
000077124 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/
000077124 590__ $$a5.479$$b2018
000077124 591__ $$aCHEMISTRY, ANALYTICAL$$b9 / 84 = 0.107$$c2018$$dQ1$$eT1
000077124 592__ $$a1.243$$b2018
000077124 593__ $$aAnalytical Chemistry$$c2018$$dQ1
000077124 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion
000077124 700__ $$0(orcid)0000-0002-7902-6005$$aMarcos, S. de$$uUniversidad de Zaragoza
000077124 700__ $$0(orcid)0000-0002-8973-5104$$aGalbán, J.$$uUniversidad de Zaragoza
000077124 7102_ $$12009$$2750$$aUniversidad de Zaragoza$$bDpto. Química Analítica$$cÁrea Química Analítica
000077124 773__ $$g185, 3 (2018), 171 [7 pp]$$pMikrochim. acta$$tMikrochimica acta$$x0026-3672
000077124 8564_ $$s377735$$uhttps://zaguan.unizar.es/record/77124/files/texto_completo.pdf$$yPostprint
000077124 8564_ $$s9176$$uhttps://zaguan.unizar.es/record/77124/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint
000077124 909CO $$ooai:zaguan.unizar.es:77124$$particulos$$pdriver
000077124 951__ $$a2019-11-26-13:43:29
000077124 980__ $$aARTICLE