Double-Langmuir model for optimized nanohole array-based plasmonic biosensors

Balasa, Ionut Gabriel; Cesca, Tiziana; Kalinic, Boris; Piccotti, Diego; Scian, Carlo; Mattei, Giovanni

doi:10.1016/j.apsusc.2021.149802

Cited by 5 publications

(3 citation statements)

References 40 publications

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“…Furthermore, compared to other techniques like the electrodeposition of oxides, which undoubtedly provide more precise thickness control, it nonetheless offers the distinct advantage of being able to regenerate the plasmonic substrate for use in other experiments.…”

Section: Resultsmentioning

confidence: 55%

“…The thickness of deposited layers was estimated by repeated AFM measurements of an intentional scratch: the measured thickness of 7 nm for 7 layers gives one the assumption of linear growth, an estimated thickness of 1 nm for each layer, which confirms reported data in similar experimental conditions. 28,29 Furthermore, compared to other techniques like the electrodeposition of oxides, which undoubtedly provide more precise thickness control, 30 it nonetheless offers the distinct advantage of being able to regenerate the plasmonic substrate for use in other experiments.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Fluorescence Enhancement in Metal Nanoantenna Arrays: From Simulation-Guided Design to Efficient Analytical Devices

Lospinoso,

Colombelli,

Cretì

et al. 2024

ACS Appl. Opt. Mater.

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The fluorescence enhancement mechanism was investigated in the presence of distance-dependent dipole metal nanoantennas using Alexa Fluor-647 as a probe molecule commonly used in biological contexts. Guided by numerical modeling, a planar arrangement of non-interacting Au nanodiscs arrays was realized on glass substrates by a cost-effective nanofabrication technique, and the contribution of their optical properties to the emission properties of the dye monolayer is evaluated and compared to the bare glass substrates. Remarkably, at an optimal spacer thickness of nearly 10 nm, a maximum fluorescence enhancement factor of up to 180 was observed. The knowledge gained will greatly assist in the design of efficient photonic devices utilizing this technology.

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Section: Resultsmentioning

confidence: 55%

Section: ■ Results and Discussionmentioning

confidence: 99%

Fluorescence Enhancement in Metal Nanoantenna Arrays: From Simulation-Guided Design to Efficient Analytical Devices

Lospinoso,

Colombelli,

Cretì

et al. 2024

ACS Appl. Opt. Mater.

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show abstract

“…In general, effective NSL procedures consist of three parts. The first is the self-assembly of polystyrene (PS) nanosphere colloids that form a hexagonal monolayer close-packed nanosphere, followed by the deposition of the desired film onto the nanosphere templates and finally, the removal of the PS nanosphere, leaving an arrayed pattern of the film through etching process [24]- [26]. Some commonly used methods in NSL are drop-casting, dip-coating, spin-coating, and Langmuir-Blodgett drop-casting or convective self-assembly drop-casting, schematically illustrated in Fig 2.…”

Section: Generationmentioning

confidence: 99%

The Prospects of Colloidal Lithography Towards Low-Cost and Scalable Sensors

Purwidyantri

Prabowo

2022

IEEE Nanotechnology Mag.

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Nanosphere lithography (NSL), a colloidal-based nanopatterning technique, has demonstrated versatility for bottom-up and top-down nanofabrication approaches with a simple procedure that can be performed in a standard chemical laboratory. This technique offers versatility for large-area nanopatterning with a low-cost process. Nanopatterned arrays have shown outstanding features in enhancing sensor performance due to their ability to create effective nanoscale physical and chemical changes, high molecular entrapment with the roughened substrate, and means of downscaling toward scalable sensors manufacturing. All these prominent properties have made NSL a promising candidate for scalable biosensors production as its performance is also highly comparable with the pre-existing lithography techniques that mostly require high-cost infrastructure. This mini-review discusses in detail the advantages of colloidal lithography over other lithography techniques from the resolution and scalability of manufacturing. It is emphasized that the cost-competitive NSL technology may be applicable for a broad range of end-users, from high-profit margins, such as communication, technology, and health sectors, to the low-profit margins, such as in food industries. The combinational strategies in NSL are presented, including polystyrene nanotemplating of the substrate, feasible integration with metallic film deposition technologies, and potential application in various sensing platforms.

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Visible Light-Illuminated Gold Nanohole Arrays With Tunable On-Chip Plasmonic Sensing Properties

Guang,

Lu,

et al. 2024

Photonic Sens

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Since the discovery of the extraordinary optical transmission phenomenon, nanohole arrays have attracted much attention and been widely applied in sensing. However, their typical fabrication process, utilizing photolithographic top-down manufacturing technologies, has intrinsic drawbacks including the high costs, time consumption, small footprint, and low throughput. This study presented a low-cost, high-throughput, and scalable method for fabricating centimeter-scale (1×2 cm2) nanohole arrays using the improved nanosphere lithography. The large-scale close-packed polystyrene monolayers obtained by the hemispherical-depression-assisted self-assembly method were employed as colloidal masks for the nanosphere lithography, and the nanohole diameter was tuned from 233 nm to 346 nm with a fixed period of 420 nm via plasma etching. The optical properties and sensing performance of the nanohole arrays were investigated, and two transmission dips were observed due to the resonant coupling of plasmonic modes. Both dips were found to be sensitive to the surrounding environment, and the maximum bulk refractive index sensitivity was up to 162.1 nm/RIU with a 233 nm hole diameter. This study offered a promising approach for fabricating large-scale highly ordered nanohole arrays with various periods and nanohole diameters that could be used for the development of low-cost and high-throughput on-chip plasmonic sensors.

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Double-Langmuir model for optimized nanohole array-based plasmonic biosensors

Cited by 5 publications

References 40 publications

Fluorescence Enhancement in Metal Nanoantenna Arrays: From Simulation-Guided Design to Efficient Analytical Devices

Fluorescence Enhancement in Metal Nanoantenna Arrays: From Simulation-Guided Design to Efficient Analytical Devices

The Prospects of Colloidal Lithography Towards Low-Cost and Scalable Sensors

Visible Light-Illuminated Gold Nanohole Arrays With Tunable On-Chip Plasmonic Sensing Properties

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