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Sol-Gel Thin Films for Plasmonic Gas Sensors.

Della Gaspera E, Martucci A - Sensors (Basel) (2015)

Bottom Line: Plasmonic gas sensors are optical sensors that use localized surface plasmons or extended surface plasmons as transducing platform.Surface plasmons are very sensitive to dielectric variations of the environment or to electron exchange, and these effects have been exploited for the realization of sensitive gas sensors.In this paper, we review our research work of the last few years on the synthesis and the gas sensing properties of sol-gel based nanomaterials for plasmonic sensors.

View Article: PubMed Central - PubMed

Affiliation: CSIRO Manufacturing Flagship, Bayview Ave, Clayton, Victoria 3168, Australia. enrico.dellagaspera@csiro.au.

ABSTRACT
Plasmonic gas sensors are optical sensors that use localized surface plasmons or extended surface plasmons as transducing platform. Surface plasmons are very sensitive to dielectric variations of the environment or to electron exchange, and these effects have been exploited for the realization of sensitive gas sensors. In this paper, we review our research work of the last few years on the synthesis and the gas sensing properties of sol-gel based nanomaterials for plasmonic sensors.

No MeSH data available.


(a) Time resolved tests for a ZnO-Au film exposed to different concentrations of CO (in ppm) at 300 °C (λ = 570 nm); (b) Sensitivity plot for ZnO-Au films for CO detection according to the doping of ZnO NPs; (c) Optical absorption spectra of Au sub-monolayers with different surface coverage. The color of the spectra is representative of the actual color of the samples; (d) SEM image in cross section of a NiO film deposited on Au NP monolayer. The red arrows highlight the Au NPs at the NiO/substrate interface; (e) SEM image in top view of an Ag nanoprism array; (f) Time resolved measurements of an aryl-bridged polysilsesquioxane films deposited on top of an Ag nanoprism array when exposed to 30 ppm xylene at room temperature (λ = 653 nm).
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sensors-15-16910-f004: (a) Time resolved tests for a ZnO-Au film exposed to different concentrations of CO (in ppm) at 300 °C (λ = 570 nm); (b) Sensitivity plot for ZnO-Au films for CO detection according to the doping of ZnO NPs; (c) Optical absorption spectra of Au sub-monolayers with different surface coverage. The color of the spectra is representative of the actual color of the samples; (d) SEM image in cross section of a NiO film deposited on Au NP monolayer. The red arrows highlight the Au NPs at the NiO/substrate interface; (e) SEM image in top view of an Ag nanoprism array; (f) Time resolved measurements of an aryl-bridged polysilsesquioxane films deposited on top of an Ag nanoprism array when exposed to 30 ppm xylene at room temperature (λ = 653 nm).

Mentions: The versatility of the exsitu approach has been also exploited to prepare ZnO-Au nanocomposites: a sol-gel synthesis based on the forced hydrolysis of zinc acetate has been used to synthesize ZnO colloidal NPs in ethanol/DMSO using tetramethylammonium hydroxide as a base/catalyst. Such NPs can be purified and concentrated in ethanol and eventually mixed with an ethanolic solution of PVP-capped Au NPs. The beauty of this approach is the possibility to independently synthesize and tune the properties of the prepared colloids: for example, we studied the effect of the doping of ZnO with different transition metal ions, analyzing their effect on the optical sensing properties of ZnO-Au nanocrystalline films monitoring the variation in the LSPR of Au NPs. A marked increase in sensitivity to CO has been observed when ZnO is doped with Co or Mn ions (Figure 4a,b), validating the strategy to synthesize high quality doped colloids and then using them in a nanocrystal ink to deposit functional nanocomposite films [59]. In a similar way, Au colloids can also be dispersed within a hybrid organic/inorganic sol-gel matrix bearing specific functionalities for the recognition of target molecules. We recently developed such nanocomposites using aryl-bridged polysilsesquioxane matrices which provide benzene rings suitable for recognition of aromatic molecules thanks to π-π coupling [60].


Sol-Gel Thin Films for Plasmonic Gas Sensors.

Della Gaspera E, Martucci A - Sensors (Basel) (2015)

(a) Time resolved tests for a ZnO-Au film exposed to different concentrations of CO (in ppm) at 300 °C (λ = 570 nm); (b) Sensitivity plot for ZnO-Au films for CO detection according to the doping of ZnO NPs; (c) Optical absorption spectra of Au sub-monolayers with different surface coverage. The color of the spectra is representative of the actual color of the samples; (d) SEM image in cross section of a NiO film deposited on Au NP monolayer. The red arrows highlight the Au NPs at the NiO/substrate interface; (e) SEM image in top view of an Ag nanoprism array; (f) Time resolved measurements of an aryl-bridged polysilsesquioxane films deposited on top of an Ag nanoprism array when exposed to 30 ppm xylene at room temperature (λ = 653 nm).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4541914&req=5

sensors-15-16910-f004: (a) Time resolved tests for a ZnO-Au film exposed to different concentrations of CO (in ppm) at 300 °C (λ = 570 nm); (b) Sensitivity plot for ZnO-Au films for CO detection according to the doping of ZnO NPs; (c) Optical absorption spectra of Au sub-monolayers with different surface coverage. The color of the spectra is representative of the actual color of the samples; (d) SEM image in cross section of a NiO film deposited on Au NP monolayer. The red arrows highlight the Au NPs at the NiO/substrate interface; (e) SEM image in top view of an Ag nanoprism array; (f) Time resolved measurements of an aryl-bridged polysilsesquioxane films deposited on top of an Ag nanoprism array when exposed to 30 ppm xylene at room temperature (λ = 653 nm).
Mentions: The versatility of the exsitu approach has been also exploited to prepare ZnO-Au nanocomposites: a sol-gel synthesis based on the forced hydrolysis of zinc acetate has been used to synthesize ZnO colloidal NPs in ethanol/DMSO using tetramethylammonium hydroxide as a base/catalyst. Such NPs can be purified and concentrated in ethanol and eventually mixed with an ethanolic solution of PVP-capped Au NPs. The beauty of this approach is the possibility to independently synthesize and tune the properties of the prepared colloids: for example, we studied the effect of the doping of ZnO with different transition metal ions, analyzing their effect on the optical sensing properties of ZnO-Au nanocrystalline films monitoring the variation in the LSPR of Au NPs. A marked increase in sensitivity to CO has been observed when ZnO is doped with Co or Mn ions (Figure 4a,b), validating the strategy to synthesize high quality doped colloids and then using them in a nanocrystal ink to deposit functional nanocomposite films [59]. In a similar way, Au colloids can also be dispersed within a hybrid organic/inorganic sol-gel matrix bearing specific functionalities for the recognition of target molecules. We recently developed such nanocomposites using aryl-bridged polysilsesquioxane matrices which provide benzene rings suitable for recognition of aromatic molecules thanks to π-π coupling [60].

Bottom Line: Plasmonic gas sensors are optical sensors that use localized surface plasmons or extended surface plasmons as transducing platform.Surface plasmons are very sensitive to dielectric variations of the environment or to electron exchange, and these effects have been exploited for the realization of sensitive gas sensors.In this paper, we review our research work of the last few years on the synthesis and the gas sensing properties of sol-gel based nanomaterials for plasmonic sensors.

View Article: PubMed Central - PubMed

Affiliation: CSIRO Manufacturing Flagship, Bayview Ave, Clayton, Victoria 3168, Australia. enrico.dellagaspera@csiro.au.

ABSTRACT
Plasmonic gas sensors are optical sensors that use localized surface plasmons or extended surface plasmons as transducing platform. Surface plasmons are very sensitive to dielectric variations of the environment or to electron exchange, and these effects have been exploited for the realization of sensitive gas sensors. In this paper, we review our research work of the last few years on the synthesis and the gas sensing properties of sol-gel based nanomaterials for plasmonic sensors.

No MeSH data available.