Sol-Gel Thin Films for Plasmonic Gas Sensors

Gaspera, Enrico Della; Martucci, Alessandro

doi:10.3390/s150716910

Cited by 40 publications

(20 citation statements)

References 70 publications

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“…Enhancing the sensitivity of LSPR optical gas sensors has been pursued by many approaches including the integration of catalytic reactive layers, 2D materials, or photonic crystal . Here, to further explore the potential of these highly faceted Au monocrystalline nanoislands, we implement a very recent strategy relying on the nanotexturing of plasmonic metasurfaces with highly porous fractal layers .…”

Section: Resultsmentioning

confidence: 99%

High‐Temperature Large‐Scale Self‐Assembly of Highly Faceted Monocrystalline Au Metasurfaces

Fusco

Rahmani

et al. 2018

Adv Funct Materials

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Localized surface plasmon resonance (LSPR) devices based on resonant metallic metasurfaces have shown disruptive potential for many applications including biosensing and photocatalysis. Despite significant progress, highly performing Au plasmonic nanotextures often suffer of suboptimal electric field enhancement, due to damping effects in multicrystalline domains. Fabricating well-defined Au nanocrystals over large surfaces is very challenging, and usually requires time-intensive multi-step processes. Here, presented are first insights on the large-scale self-assembly of monocrystalline Au nano-islands with tunable size and separation, and their application as efficient LSPR surfaces. Highly homogeneous centimeter-sized Au metasurfaces are fabricated by one-step deposition and in situ coalescence of hot nanoparticle aerosols into a discontinuous monolayer of highly faceted monocrystals. First insights on the mechanisms driving the high-temperature synthesis of these highly faceted Au nanotextures are obtained by molecular dynamic and detailed experimental investigation of their growth kinetics. Notably, these metasurfaces demonstrat high-quality and tunable LSPR, enabling the fabrication of highly performing optical gas molecule sensors detecting down to 3 × 10 −6 variations in refractive index at room temperature. It is believed that these findings provide a rapid, low-cost nanofabrication tool for the engineering of highly homogenous Au metasurfaces for large-scale LSPR devices with application ranging from ultrasensitive optical gas sensors to photocatalytic macroreactors.

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Section: Resultsmentioning

confidence: 99%

High‐Temperature Large‐Scale Self‐Assembly of Highly Faceted Monocrystalline Au Metasurfaces

Fusco

Rahmani

et al. 2018

Adv Funct Materials

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show abstract

“…In this sense, the development of devices applied to industrial processes [ 1 ], home security [ 2 ], monitoring of air quality [ 3 ] and explosives [ 4 ], and the detection of pollutants [ 5 ] and toxic compounds [ 6 ] are essential, in addition to wearable devices used as accessories and implants [ 7 ]. The manufacturing process of devices can involve a broad range of deposition techniques, such as sol-gel process [ 8 , 9 , 10 , 11 , 12 ], sputtering [ 13 , 14 ], chemical vapor deposition (CVD) [ 15 ], plasma spray [ 16 , 17 ], microwave-assisted synthesis [ 18 , 19 ], and the disruptive technique atomic layer deposition (ALD) [ 20 , 21 , 22 ]. Among them, ALD stands out for its unique capabilities, which include the complex shapes coverage embedded in high conformal 3D areas [ 23 ], the growth of stacked monolayers of different nanomaterials [ 24 ], and the growth of thin films precisely defined by self-limited surface reactions [ 25 , 26 , 27 , 28 , 29 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Plasma-Enhanced Atomic Layer Deposition on Oxygen Overabundance and Its Influence on the Morphological, Optical, Structural, and Mechanical Properties of Al-Doped TiO2 Coating

et al. 2021

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The chemical, structural, morphological, and optical properties of Al-doped TiO2 thin films, called TiO2/Al2O3 nanolaminates, grown by plasma-enhanced atomic layer deposition (PEALD) on p-type Si <100> and commercial SLG glass were discussed. High-quality PEALD TiO2/Al2O3 nanolaminates were produced in the amorphous and crystalline phases. All crystalline nanolaminates have an overabundance of oxygen, while amorphous ones lack oxygen. The superabundance of oxygen on the crystalline film surface was illustrated by a schematic representation that described this phenomenon observed for PEALD TiO2/Al2O3 nanolaminates. The transition from crystalline to amorphous phase increased the surface hardness and the optical gap and decreased the refractive index. Therefore, the doping effect of TiO2 by the insertion of Al2O3 monolayers showed that it is possible to adjust different parameters of the thin-film material and to control, for example, the mobility of the hole-electron pair in the metal-insulator-devices semiconductors, corrosion protection, and optical properties, which are crucial for application in a wide range of technological areas, such as those used to manufacture fluorescence biosensors, photodetectors, and solar cells, among other devices.

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“…The sol-gel route is a major technique used to prepare these films. This technique generally involves wet chemical coatings of sol-gel solutions on a substrate by dip, spray or spin coating (Gaspera & Martucci, 2015). The influence of evaporation rate of solvents is an additional key parameter that might determine the final structure (Gibaud et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Controllability of pore size on macroporous sol-gel silica films embedding rhodamine 6G

Castañeda-Contreras¹,

Guevara²,

Menéses-Nava³

et al. 2021

JART

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A facile method is reported to synthesize macroporous silica films embedding rhodamine 6G. The films were obtained by sol-gel and spin-coating processes. Results pointed out a dependence of pore formation on the addition of rhodamine 6G in the film composition. The probable formation process of the pores was attributed to the aggregation of charged species from rhodamine 6G. Although the pores were randomly distributed on the film surface, the pore size was tuned at certain extent by controlling the evaporation and condensation rates at early stages of spin coating. Results indicated that the evaporation rate determined the pore size distribution of the films.

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Sol-Gel Thin Films for Plasmonic Gas Sensors

Cited by 40 publications

References 70 publications

High‐Temperature Large‐Scale Self‐Assembly of Highly Faceted Monocrystalline Au Metasurfaces

High‐Temperature Large‐Scale Self‐Assembly of Highly Faceted Monocrystalline Au Metasurfaces

Effect of Plasma-Enhanced Atomic Layer Deposition on Oxygen Overabundance and Its Influence on the Morphological, Optical, Structural, and Mechanical Properties of Al-Doped TiO2 Coating

Controllability of pore size on macroporous sol-gel silica films embedding rhodamine 6G

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