InP/InGaP surface quantum dots are interesting materials for optical chemical sensors since they present an intense emission at room temperature, whose intensity changes rapidly and reversibly depending on the composition of the environmental atmosphere. We present here their emission properties by time resolved photoluminescence spectroscopy investigation and we discuss the physico-chemical mechanism behind their sensitivity to the surrounding atmosphere. Photoluminescence transients in inert atmosphere (N2) and in solvent vapours of methanol, clorophorm, acetone and water were measured. The presence of vapors of clorophorm, acetone and water showed a very weak effect on the transient times, while an increase of up to 15% of the decay time was observed for methanol vapour exposure. On the basis of the vapor molecule nature (polarity, proticity, steric hindrance, etc.) and of the interaction of the vapor molecules with the quantum dots surface a sensing mechanism involving quantum dots non-radiative surface states is proposed.

PROSPOSITO, P., De Angelis, R., DE MATTEIS, F., Hatami, F., Masselink, W., Zhang, H., et al. (2016). Physico-chemical mechanism for the vapors sensitivity of photoluminescent InP quantum dots. IOP CONFERENCE SERIES: MATERIALS SCIENCE AND ENGINEERING, 108(1) [10.1088/1757-899X/108/1/012034].

Physico-chemical mechanism for the vapors sensitivity of photoluminescent InP quantum dots

PROSPOSITO, PAOLO;DE MATTEIS, FABIO;CASALBONI, MAURO
2016

Abstract

InP/InGaP surface quantum dots are interesting materials for optical chemical sensors since they present an intense emission at room temperature, whose intensity changes rapidly and reversibly depending on the composition of the environmental atmosphere. We present here their emission properties by time resolved photoluminescence spectroscopy investigation and we discuss the physico-chemical mechanism behind their sensitivity to the surrounding atmosphere. Photoluminescence transients in inert atmosphere (N2) and in solvent vapours of methanol, clorophorm, acetone and water were measured. The presence of vapors of clorophorm, acetone and water showed a very weak effect on the transient times, while an increase of up to 15% of the decay time was observed for methanol vapour exposure. On the basis of the vapor molecule nature (polarity, proticity, steric hindrance, etc.) and of the interaction of the vapor molecules with the quantum dots surface a sensing mechanism involving quantum dots non-radiative surface states is proposed.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/03 - Fisica della Materia
Settore ING-IND/22 - Scienza e Tecnologia dei Materiali
English
Engineering (all); Materials Science (all)
Article n. 012034
http://www.iop.org/EJ/journal/mse
PROSPOSITO, P., De Angelis, R., DE MATTEIS, F., Hatami, F., Masselink, W., Zhang, H., et al. (2016). Physico-chemical mechanism for the vapors sensitivity of photoluminescent InP quantum dots. IOP CONFERENCE SERIES: MATERIALS SCIENCE AND ENGINEERING, 108(1) [10.1088/1757-899X/108/1/012034].
Prosposito, P; De Angelis, R; DE MATTEIS, F; Hatami, F; Masselink, W; Zhang, H; Casalboni, M
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/155467
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