Ratiometric pressure sensitive paints (r-PSPs) are all-optical probes for monitoring oxygen flows in the vicinity of complex or miniaturized surfaces. They typically consist of a porous binder embedding mixtures of a reference and a sensor chromophore exhibiting oxygen-insensitive and oxygen-responsive luminescence, respectively. Here, we demonstrate the first example of an r-PSP based on a single two-color emitter that removes limitations of r-PSPs based on chromophore mixtures such as different temperature dependencies of the two chromophores, cross-readout between the reference and sensor signals and phase segregation. In our approach, we utilize a novel "double-sensor" r-PSP that features two spectrally separated emission bands with opposite responses to the O2 pressure, which boosts the sensitivity with respect to traditional reference-sensor pairs. Specifically, we use two-color-emitting dot-in-bulk CdSe/CdS core/shell nanocrystals, exhibiting red and green emission bands from their core and shell states, whose intensities are respectively enhanced and quenched in response to the increased oxygen partial pressure that effectively tunes the position of the nanocrystal's Fermi energy. This leads to a strong and reversible ratiometric response at the single particle level and an over 100% enhancement in the pressure sensitivity. Our proof-of-concept r-PSPs further exhibit suppressed cross-readout thanks to zero spectral overlap between the core and shell luminescence bands and a temperature-independent ratiometric response between 0 and 70 °C

Lorenzon, M., Pinchetti, V., Bruni, F., Bae, W., Meinardi, F., Klimov, V., et al. (2017). Single-Particle Ratiometric Pressure Sensing Based on "Double-Sensor" Colloidal Nanocrystals. NANO LETTERS, 17(2), 1071-1081 [10.1021/acs.nanolett.6b04577].

Single-Particle Ratiometric Pressure Sensing Based on "Double-Sensor" Colloidal Nanocrystals

LORENZON, MONICA
Primo
;
PINCHETTI, VALERIO
Secondo
;
BRUNI, FRANCESCO;MEINARDI, FRANCESCO;BROVELLI, SERGIO
Ultimo
2017

Abstract

Ratiometric pressure sensitive paints (r-PSPs) are all-optical probes for monitoring oxygen flows in the vicinity of complex or miniaturized surfaces. They typically consist of a porous binder embedding mixtures of a reference and a sensor chromophore exhibiting oxygen-insensitive and oxygen-responsive luminescence, respectively. Here, we demonstrate the first example of an r-PSP based on a single two-color emitter that removes limitations of r-PSPs based on chromophore mixtures such as different temperature dependencies of the two chromophores, cross-readout between the reference and sensor signals and phase segregation. In our approach, we utilize a novel "double-sensor" r-PSP that features two spectrally separated emission bands with opposite responses to the O2 pressure, which boosts the sensitivity with respect to traditional reference-sensor pairs. Specifically, we use two-color-emitting dot-in-bulk CdSe/CdS core/shell nanocrystals, exhibiting red and green emission bands from their core and shell states, whose intensities are respectively enhanced and quenched in response to the increased oxygen partial pressure that effectively tunes the position of the nanocrystal's Fermi energy. This leads to a strong and reversible ratiometric response at the single particle level and an over 100% enhancement in the pressure sensitivity. Our proof-of-concept r-PSPs further exhibit suppressed cross-readout thanks to zero spectral overlap between the core and shell luminescence bands and a temperature-independent ratiometric response between 0 and 70 °C
Articolo in rivista - Articolo scientifico
Ratiometric oxygen sensing; core/shell; dot-in-bulk nanocrystals; dual color emission; photocharging; pressure sensitive paints
English
2017
17
2
1071
1081
partially_open
Lorenzon, M., Pinchetti, V., Bruni, F., Bae, W., Meinardi, F., Klimov, V., et al. (2017). Single-Particle Ratiometric Pressure Sensing Based on "Double-Sensor" Colloidal Nanocrystals. NANO LETTERS, 17(2), 1071-1081 [10.1021/acs.nanolett.6b04577].
File in questo prodotto:
File Dimensione Formato  
Lorenzon-2017-Nano Lett-VoR.pdf

Solo gestori archivio

Descrizione: Letter
Tipologia di allegato: Publisher’s Version (Version of Record, VoR)
Dimensione 4.05 MB
Formato Adobe PDF
4.05 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Lorenzon-2017-Nano Lett-AAM.pdf

accesso aperto

Descrizione: Letter
Tipologia di allegato: Author’s Accepted Manuscript, AAM (Post-print)
Dimensione 479.6 kB
Formato Adobe PDF
479.6 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/140641
Citazioni
  • Scopus 25
  • ???jsp.display-item.citation.isi??? 24
Social impact