doi:10.1007/s00604-018-2676-yengMartín-Barreiro, A.Marcos, S. deGalbán, J.Gold nanoclusters as a quenchable fluorescent probe for sensing oxygen at high temperaturesART-2018-104560Gold 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.].2018http://zaguan.unizar.es/record/7712410.1007/s00604-018-2676-yhttp://zaguan.unizar.es/record/77124oai:zaguan.unizar.es:77124info:eu-repo/grantAgreement/ES/DGA/E74info:eu-repo/grantAgreement/ES/MINECO/CTQ2016-76846-RMikrochimica acta 185, 3 (2018), 171 [7 pp]All rights reservedhttp://www.europeana.eu/rights/rr-f/info:eu-repo/semantics/openAccess