Journal
ANALYTICAL CHEMISTRY
Volume 92, Issue 6, Pages 4349-4356Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.9b05153
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Funding
- Portuguese Foundation for Science and Technology (FCT) [UID/FIS/04650/2019]
- FCT [PTDC/FIS-NAN/1154/2014, PTDC/FIS-MAC/32299/2017, SFRH/BD/118684/2016, SFRH/BD/137076/2018, NANOSENSING POCI-01-0145-FEDER-016902, NANO4BIO POCI-01-0145-FEDER-032299]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/137076/2018, PTDC/FIS-MAC/32299/2017] Funding Source: FCT
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Gas sensing based on bulk refractive index (RI) changes, has been a challenging task for localized surface plasmon resonance (LSPR) spectroscopy, presenting only a limited number of reports in this field. In this work, it is demonstrated that a plasmonic thin film composed of Au nanoparticles embedded in a CuO matrix can be used to detect small changes (as low as 6 x 10(-5) RIU) in bulk RI of gases at room temperature, using a high-resolution LSPR spectroscopy system. To optimize the film's surface, a simple Ar plasma treatment revealed to be enough to remove the top layers of the film and to partially expose the embedded nanoparticles, and thus enhance the film's gas sensing capabilities. The treated sample exhibits high sensitivity to inert gases (Ar, N-2), presenting a refractive index sensitivity (RIS) to bulk RI changes of 425 nm/RIU. Furthermore, a 2-fold signal increase is observed for O-2, showing that the film is clearly more sensitive to this gas due to its oxidizing nature. The results showed that the Au:CuO thin film system is a RI sensitive platform able to detect inert gases, which can be more sensitive to detect noninert gases as O-2 or even other reactive species.
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