Reversed oxygen sensing using colloidal quantum wells towards highly emissive photoresponsive varnishes

Monica Lorenzon, Sotirios Christodoulou, Gianfranco Vaccaro, Jacopo Pedrini, Francesco Meinardi, Iwan Moreels () and Sergio Brovelli ()
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Monica Lorenzon: Università degli Studi di Milano-Bicocca
Sotirios Christodoulou: Istituto Italiano di Tecnologia
Gianfranco Vaccaro: Università degli Studi di Milano-Bicocca
Jacopo Pedrini: Università degli Studi di Milano-Bicocca
Francesco Meinardi: Università degli Studi di Milano-Bicocca
Iwan Moreels: Istituto Italiano di Tecnologia
Sergio Brovelli: Università degli Studi di Milano-Bicocca

Nature Communications, 2015, vol. 6, issue 1, 1-9

Abstract: Abstract Colloidal quantum wells combine the advantages of size-tunable electronic properties with vast reactive surfaces that could allow one to realize highly emissive luminescent-sensing varnishes capable of detecting chemical agents through their reversible emission response, with great potential impact on life sciences, environmental monitoring, defence and aerospace engineering. Here we combine spectroelectrochemical measurements and spectroscopic studies in a controlled atmosphere to demonstrate the ‘reversed oxygen-sensing’ capability of CdSe colloidal quantum wells, that is, the exposure to oxygen reversibly increases their luminescence efficiency. Spectroelectrochemical experiments allow us to directly relate the sensing response to the occupancy of surface states. Magneto-optical measurements demonstrate that, under vacuum, heterostructured CdSe/CdS colloidal quantum wells stabilize in their negative trion state. The high starting emission efficiency provides a possible means to enhance the oxygen sensitivity by partially de-passivating the particle surfaces, thereby enhancing the density of unsaturated sites with a minimal cost in term of luminescence losses.

Date: 2015
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms7434

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DOI: 10.1038/ncomms7434

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