Multilayered Materials Comprising Mesoporous Thin Films and Metal Nanoparticles

Rodríguez-Fernández, Denis; Angelomé, Paula C.; Soler-Illia, Galo J. A. A.; Liz‐Marzán, Luis M.

doi:10.1002/ppsc.201600428

Cited by 8 publications

(8 citation statements)

References 62 publications

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“…Furthermore, from these images it can be concluded that the mesoporous thin film formation was not affected by the roughness of the substrate imposed by the immobilized NPs. 49 Similar results were obtained for Au15dY/TF and Au35dY/TF systems ( Figures S2 and S3, respectively).…”

Section: Resultssupporting

confidence: 84%

Au Nanoparticles–Mesoporous TiO₂ Thin Films Composites as SERS Sensors: A Systematic Performance Analysis

et al. 2018

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The combination of plasmonic nanoparticles and mesoporous materials is of much interest in applications such as sensing or catalysis. The production of such hybrid materials can be done in various ways, leading to different architectures. We present a comparative study of the SERS performance of different nanocomposite architectures comprising mesoporous TiO 2 thin films and Au nanoparticles (NPs). The selection of TiO 2 as mesoporous support material was based on its high chemical and mechanical stability. Au NPs of different sizes and shapes were placed at different locations of the composite and used as a plasmonic material compatible with the synthesis conditions of the mesoporous films, displaying a high chemical stability. Using pnitrothiophenol as a molecular probe, we evaluated the performance toward surface-enhanced Raman scattering (SERS) sensing, on the basis of minimum acquisition time, spot-to-spot reproducibility and limit of detection. The obtained results indicate that each platform features different sensing capabilities. While systems comprising Au NPs within the mesopores allow working with low acquisition times and present high signal uniformity, only a detection limit of μM was achieved. On the other hand, those systems made of branched Au NPs covered with mesoporous films require low acquisition times and can achieve detection limits as low as 10 pM, but signal uniformity is compromised. We propose that careful comparison of different SERS platforms based on Au NPs and mesoporous thin films will facilitate selecting an appropriate configuration for any desired application.

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Section: Resultssupporting

confidence: 84%

Au Nanoparticles–Mesoporous TiO₂ Thin Films Composites as SERS Sensors: A Systematic Performance Analysis

et al. 2018

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“…These results are in agreement with those previously obtained for silica films and multilayered systems. 27,44 Regarding the film thicknesses, they are still in the same range (180-200 nm, Table S5 and Figure S6), although some differences are observed due to the fact that spin coating was used to prepare Au66/TX samples, instead of dip coating procedure used for TX samples. Moreover, the films are smooth over the Au NPs (Figure S6).…”

Section: Overgrowth Of Au Nps Placed Below Mesoporous Tio 2 Thin Filmmentioning

confidence: 97%

TiO₂ mesoporous thin film architecture as a tool to control Au nanoparticles growth and sensing capabilities

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et al. 2019

Phys. Chem. Chem. Phys.

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“…Thus, samples were treated at 200 °C to consolidate the oxide, followed by ethanol extraction of the template, a procedure that was previously used for MOTFs or composites that contain other thermally sensitive chemical moieties or particles [9a,b,d,13] . Only if following this treatment, we conserved the UCNPs' emission and obtained smooth and transparent thin films composites.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, it is possible to conclude that the presence of the UCNPs does not significantly affect neither the porosity nor the mesoporous structure of the oxide thin films. The UCNPs can be considered as another combinable building block for developing composite thin films, likewise metallic and/or SiO 2 nanoparticles [9a,d] …”

Section: Resultsmentioning

confidence: 99%

Emissive Platforms Employing NaYF₄‐based Upconverting Nanoparticles and Mesoporous Metal Oxide Thin Films

et al. 2021

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We present the design and synthesis of a novel optically transparent platform based on the combination of NaYF 4 : Er 3 + , Yb 3 + upconverting nanoparticles (UCNPs) and mesoporous metal oxide thin films (MOTFs). The UCNP were obtained by the thermolysis method and were deposited onto a glass substrate by spin coating. The MOTFs (TiO 2 , ZrO 2 and SiO 2 ), prepared by the combination of the sol-gel approach and the self-assembly of surfactants, were subsequently deposited on top of the particles giving rise to an ultrathin composite. The characterization of the obtained composite films indicates that they blend the properties of both starting materials: they exhibit upconverting properties, as they are capable of emitting visible light when irradiated in the NIR region, and the MOTFs deposited on top provide an ordered array of mesopores with highly accessible porosity. As the UCNPs emission properties depend on their surrounding temperature, the composite films were tested for temperature sensing applications, using both emission intensity and lifetimes of different signals, with promising results.

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Multilayered Materials Comprising Mesoporous Thin Films and Metal Nanoparticles

Abstract: The ORCID identification number(s) for the author(s) of this article can be found under http://dx.

Cited by 8 publications

References 62 publications

Au Nanoparticles–Mesoporous TiO₂ Thin Films Composites as SERS Sensors: A Systematic Performance Analysis

Au Nanoparticles–Mesoporous TiO₂ Thin Films Composites as SERS Sensors: A Systematic Performance Analysis

TiO₂ mesoporous thin film architecture as a tool to control Au nanoparticles growth and sensing capabilities

Emissive Platforms Employing NaYF₄‐based Upconverting Nanoparticles and Mesoporous Metal Oxide Thin Films

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Multilayered Materials Comprising Mesoporous Thin Films and Metal Nanoparticles

Abstract: The ORCID identification number(s) for the author(s) of this article can be found under http://dx.

Cited by 8 publications

References 62 publications

Au Nanoparticles–Mesoporous TiO2 Thin Films Composites as SERS Sensors: A Systematic Performance Analysis

Au Nanoparticles–Mesoporous TiO2 Thin Films Composites as SERS Sensors: A Systematic Performance Analysis

TiO2 mesoporous thin film architecture as a tool to control Au nanoparticles growth and sensing capabilities

Emissive Platforms Employing NaYF4‐based Upconverting Nanoparticles and Mesoporous Metal Oxide Thin Films

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Au Nanoparticles–Mesoporous TiO₂ Thin Films Composites as SERS Sensors: A Systematic Performance Analysis

Au Nanoparticles–Mesoporous TiO₂ Thin Films Composites as SERS Sensors: A Systematic Performance Analysis

TiO₂ mesoporous thin film architecture as a tool to control Au nanoparticles growth and sensing capabilities

Emissive Platforms Employing NaYF₄‐based Upconverting Nanoparticles and Mesoporous Metal Oxide Thin Films