Abstract
Nanocomposite thin films, composed of monometallic Au and Ag, and bimetallic Au[sbnd]Ag nanoparticles, dispersed in a CuO matrix were prepared, characterised and tested for Localized Surface Plasmon Resonance (LSPR) sensing. The films were deposited by reactive magnetron sputtering, followed by a post-deposition thermal annealing to modify the size and shape of the nanoparticles distribution within the oxide matrix. Regarding the main results of the monometallic systems, the Au:CuO films showed LSPR bands from 800 nm to 650 nm, which reveal a progressive narrowing and a continuous blue-shift with increasing temperature (400–700 °C). The Ag:CuO films evidenced plasmonic bands at about 400 nm for temperatures of 500 °C and above. The bimetallic system, Au-Ag:CuO, showed LSPR bands in the range between those of the corresponding monometallic systems, due to the presence of Ag enriched Au[sbnd]Ag alloy nanoparticles, taking part of Janus-like structures in some cases. In terms of LSPR sensing, Au:CuO films revealed the highest values of refractive index sensitivity since the nanoparticles are more exposed to the surrounding environment.
| Original language | English |
|---|---|
| Pages (from-to) | 152-168 |
| Number of pages | 17 |
| Journal | Applied Surface Science |
| Volume | 484 |
| DOIs | |
| Publication status | Published - 1 Aug 2019 |
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Keywords
- CuO matrix
- Localized surface plasmon resonance
- Magnetron sputtering deposition
- Microstructure
- Nanoparticles
- Thin films
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Nanocomposite thin films based on Au-Ag nanoparticles embedded in a CuO matrix for localized surface plasmon resonance sensing. / Proença, Manuela; Borges, Joel; Rodrigues, Marco S.; Meira, Diana I.; Sampaio, Paula; Dias, João P.; Pedrosa, Paulo; Martin, Nicolas; Bundaleski, Nenad; Teodoro, Orlando M. N. D.; Vaz, Filipe.
In: Applied Surface Science, Vol. 484, 01.08.2019, p. 152-168.Research output: Contribution to journal › Article
TY - JOUR
T1 - Nanocomposite thin films based on Au-Ag nanoparticles embedded in a CuO matrix for localized surface plasmon resonance sensing
AU - Proença, Manuela
AU - Borges, Joel
AU - Rodrigues, Marco S.
AU - Meira, Diana I.
AU - Sampaio, Paula
AU - Dias, João P.
AU - Pedrosa, Paulo
AU - Martin, Nicolas
AU - Bundaleski, Nenad
AU - Teodoro, Orlando M. N. D.
AU - Vaz, Filipe
N1 - This work was supported by the Portuguese Foundation for Science and Technology (FCT) in the framework of the Strategic Funding UID/FIS/04650/2019; and by the projects NANOSENSING, POCI-01-0145-FEDER-016902 , with FCT reference PTDC/FIS-NAN/1154/2014; and NANO4BIO, POCI-01-0145-FEDER-032299 , with FCT reference PTDC/FIS-MAC/32299/2017. Manuela Proença acknowledges her PhD grant from FCT, with reference SFRH/BD/137076/2018. Joel Borges acknowledges FCT for his Post-Doc grant SFRH/BPD/117010/2016. Marco S. Rodrigues acknowledges FCT for his PhD grant with reference SFRH/BD/118684/2016.
PY - 2019/8/1
Y1 - 2019/8/1
N2 - Nanocomposite thin films, composed of monometallic Au and Ag, and bimetallic Au[sbnd]Ag nanoparticles, dispersed in a CuO matrix were prepared, characterised and tested for Localized Surface Plasmon Resonance (LSPR) sensing. The films were deposited by reactive magnetron sputtering, followed by a post-deposition thermal annealing to modify the size and shape of the nanoparticles distribution within the oxide matrix. Regarding the main results of the monometallic systems, the Au:CuO films showed LSPR bands from 800 nm to 650 nm, which reveal a progressive narrowing and a continuous blue-shift with increasing temperature (400–700 °C). The Ag:CuO films evidenced plasmonic bands at about 400 nm for temperatures of 500 °C and above. The bimetallic system, Au-Ag:CuO, showed LSPR bands in the range between those of the corresponding monometallic systems, due to the presence of Ag enriched Au[sbnd]Ag alloy nanoparticles, taking part of Janus-like structures in some cases. In terms of LSPR sensing, Au:CuO films revealed the highest values of refractive index sensitivity since the nanoparticles are more exposed to the surrounding environment.
AB - Nanocomposite thin films, composed of monometallic Au and Ag, and bimetallic Au[sbnd]Ag nanoparticles, dispersed in a CuO matrix were prepared, characterised and tested for Localized Surface Plasmon Resonance (LSPR) sensing. The films were deposited by reactive magnetron sputtering, followed by a post-deposition thermal annealing to modify the size and shape of the nanoparticles distribution within the oxide matrix. Regarding the main results of the monometallic systems, the Au:CuO films showed LSPR bands from 800 nm to 650 nm, which reveal a progressive narrowing and a continuous blue-shift with increasing temperature (400–700 °C). The Ag:CuO films evidenced plasmonic bands at about 400 nm for temperatures of 500 °C and above. The bimetallic system, Au-Ag:CuO, showed LSPR bands in the range between those of the corresponding monometallic systems, due to the presence of Ag enriched Au[sbnd]Ag alloy nanoparticles, taking part of Janus-like structures in some cases. In terms of LSPR sensing, Au:CuO films revealed the highest values of refractive index sensitivity since the nanoparticles are more exposed to the surrounding environment.
KW - CuO matrix
KW - Localized surface plasmon resonance
KW - Magnetron sputtering deposition
KW - Microstructure
KW - Nanoparticles
KW - Thin films
UR - http://www.scopus.com/inward/record.url?scp=85064107473&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2019.04.085
DO - 10.1016/j.apsusc.2019.04.085
M3 - Article
VL - 484
SP - 152
EP - 168
JO - Applied Surface Science
JF - Applied Surface Science
SN - 0169-4332
ER -