Automated self-assembly and electrical characterization of nanostructured films

Hensel, Rafael C.; Rodrigues, Kevin L.; Pimentel, Vinicius do Lago; Riul, Antonio

doi:10.1557/mrc.2018.47

Cited by 10 publications

(16 citation statements)

References 14 publications

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“…A linear trend growth was observed only after the twentieth five deposited layer, thus indicating a homogeneous adsorption process of materials on the electrode interface. The (PDDA/CuTsPc) 50 film deposition was chosen to such analysis as it is easier to compare with recent ongoing studies on the capacitance change in the LbL dipping process made in our research group (Ferreira, 2016 ; Hensel et al, 2018 ).…”

Section: Resultsmentioning

confidence: 99%

“…The LbL polymer film deposition was made in a home-made setup based on an Arduino board UNO and stepper motors. This setup allows a fully automated LbL film mounting with precise control of a large number of parameters for the LbL film deposition such as dipping velocities, time of immersion in each polyelectrolyte, wash and dry times (Hensel et al, 2018 ).…”

Section: Methodsmentioning

confidence: 99%

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3D Printed e-Tongue

et al. 2018

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Nowadays, one of the biggest issues addressed to electronic sensor fabrication is the build-up of efficient electrodes as an alternative way to the expensive, complex and multistage processes required by traditional techniques. Printed electronics arises as an interesting alternative to fulfill this task due to the simplicity and speed to stamp electrodes on various surfaces. Within this context, the Fused Deposition Modeling 3D printing is an emerging, cost-effective and alternative technology to fabricate complex structures that potentiates several fields with more creative ideas and new materials for a rapid prototyping of devices. We show here the fabrication of interdigitated electrodes using a standard home-made CoreXY 3D printer using transparent and graphene-based PLA filaments. Macro 3D printed electrodes were easily assembled within 6 min with outstanding reproducibility. The electrodes were also functionalized with different nanostructured thin films via dip-coating Layer-by-Layer technique to develop a 3D printed e-tongue setup. As a proof of concept, the printed e-tongue was applied to soil analysis. A control soil sample was enriched with several macro-nutrients to the plants (N, P, K, S, Mg, and Ca) and the discrimination was done by electrical impedance spectroscopy of water solution of the soil samples. The data was analyzed by Principal Component Analysis and the 3D printed sensor distinguished clearly all enriched samples despite the complexity of the soil chemical composition. The 3D printed e-tongue successfully used in soil analysis encourages further investments in developing new sensory tools for precision agriculture and other fields exploiting the simplicity and flexibility offered by the 3D printing techniques.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

3D Printed e-Tongue

et al. 2018

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“…However, the NPs deposited between adjacent digits, equivalent to half of the total IDE area, do modify the electrical response, as illustrated in Figure 1(c). We perform impedance measurements using a homemade setup, described in detail elsewhere [37]. Briefly, a sinusoidal voltage of 1 V amplitude at 1 kHz is applied to one comb of digits of the IDE [37].…”

Section: In Situ Impedance Monitoring Of Ide During Np Depositionmentioning

confidence: 99%

Monitoring and modeling the deposition of metal nanoparticles on surfaces by impedance

Hensel

Gonçalves

Rodrigues

et al. 2021

Applied Surface Science

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The study of metallic nanoparticles (NPs) on surfaces and their properties has become a common subject for a variety of areas. Notably, to exploit the unique intrinsic features of deposited NPs in macroscopic devices, samples with low coverage are required. The electrical characterization techniques has, however, so far been limited mostly to systems near or beyond the percolation limit, when the nanostructure's resistive behavior is dominant. Here we describe the impedance response of interdigitated electrodes (IDE) during Ag NP deposition, from the very beginning up to the percolation limit. Our experiments present two regimes: up to ∼20% of coverage the capacitance grows linearly with the deposition, increasing abruptly afterward. To understand the experimental data, we propose a model in which the capacitance response is attributed to isolated and agglomerated NPs. Initially, isolated NPs contribute to the ca-

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“…LbL films with two polyelectrolyte couples were deposited on quartz substrates by sequential dipping [18]. Two different polyelectrolyte couples are used here.…”

Section: Monitoring the Dispersion And Agglomeration Of Silver Nanopamentioning

confidence: 99%

Monitoring the dispersion and agglomeration of silver nanoparticles in polymer thin films using localized surface plasmons and Ferrell plasmons

Hensel

Moreira

Riul

et al. 2020

Applied Physics Letters

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The ability to disperse metallic nano-objects in a given matrix material is an important issue for the design and fabrication of functional materials. A means to monitor the spatial distribution of the nano-dopants is highly desirable but often possible only a posteriori and with destructive techniques. Here we present a spectroscopic characterization based on different plasmonic responses of silver nanoparticles, their agglomerates, and finally the percolated silver film. We demonstrate its usefulness for the specific case of their dispersion in layer-by-layer polymeric films but the method is extendable to any other host material transparent in the visible/near UV range. Individual silver nanoparticles display the well-known localized surface plasmon resonance around 400 nm, which is red-shifted upon inter-particle coupling. The transition regime between weakly coupled particles and fully percolated metal films is, however, much harder to evidence unambiguously. We show here how to monitor this transition using the so-called Ferrell plasmon, a plasmonic mode of the thin film in the mid-UV, and excitable only under oblique irradiation but without specific coupling precautions. We can thus follow the entire transition from isolated to coupled and finally to fully agglomerated nanoparticles by optical spectroscopy.

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Automated self-assembly and electrical characterization of nanostructured films

Abstract: Abstract

Cited by 10 publications

References 14 publications

3D Printed e-Tongue

3D Printed e-Tongue

Monitoring and modeling the deposition of metal nanoparticles on surfaces by impedance

Monitoring the dispersion and agglomeration of silver nanoparticles in polymer thin films using localized surface plasmons and Ferrell plasmons

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