Thick nanoporous matrices of polystyrene nanoparticles and their potential for electrochemical biosensing

Sopoušek, Jakub; Humlíček, Josef; Hlaváček, Antonín; Horáčková, Veronika; Skládal, Petr; Lacina, Karel

doi:10.1016/j.electacta.2020.137607

Cited by 5 publications

(3 citation statements)

References 22 publications

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“…The possibility to approximate r p this way has already been proposed in [4]. The R is the radius of NP.…”

Section: A Steady-state Current Approachmentioning

confidence: 99%

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Diffusion Behavior of Analyte Molecules in a Nanoporous Matrix Created from Polystyrene Nanoparticles

Košelová¹

2023

Proceedings II of the 29st Conference STUDENT EEICT 2023: Selected Papers.

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This study investigates the diffusion behavior of analyte molecules in a nanoporous matrix of polystyrene particles. Two approaches, steady-state current and potential step chronoamperometry were employed to calculate diffusion coefficients and compare the effect of nanoporous matrices with different diameter of pores and different method of immobilization of enzyme. Pores were created with close packing of polystyrene nanoparticles. The covalent and cross-linking immobilization were used to immobilize the enzyme. Chronoamperometric measurement was applied to detect analyte. The study found that the presence of nanoporous matrices immobilized on p-lysine affects diffusion. The potential step chronoamperometry method showed the improvement of diffusion. This study provides insight into the diffusion behavior of analyte molecules in nanoporous matrices, which can be useful in optimizing the design of amperometric biosensors.

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“…The possibility to approximate r p this way has already been proposed in [4]. The R is the radius of NP.…”

Section: A Steady-state Current Approachmentioning

confidence: 99%

“…In the past, it was worked with similar systems as this paper [4] [5]. We want to test, if diffusion through the pores is an important factor and whether the diffusion coefficients will decrease (a higher diffusion coefficient means better transport of substances).…”

Section: Introductionmentioning

confidence: 99%

Diffusion Behavior of Analyte Molecules in a Nanoporous Matrix Created from Polystyrene Nanoparticles

Košelová¹

2023

Proceedings II of the 29st Conference STUDENT EEICT 2023: Selected Papers.

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“…During the spray process, the formed droplets are deposited on a substrate where they coalesce to form a coating [25]. However, when a droplet containing nonvolatile solutes dries on a solid surface, it leaves a dense, ring-like deposit along the perimeter, forming a "coffee ring" on the surface, which greatly affects the uniformity and color of the film [26,27].…”

Section: Introductionmentioning

confidence: 99%

Large-Area Fabrication of Structurally Colored and Humidity Sensitive Composite Nanofilm via Ultrasonic Spray-Coating

Kou

Zhang

et al. 2021

Polymers

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Intelligent structural colors have received extensive attention in recent years due to their diverse applications. However, the large-area, uniform, and cost-effective fabrication of ultra-thin structural color films is still challenging. Here, for the first time, we design and employ an ultrasonic spray-coating technique with non-toxic, green nano-silica and polyvinylpyrrolidone as raw materials, to prepare structural color films on silicon wafers. Due to the addition of polyvinylpyrrolidone, the coffee-ring effect during droplet drying is suppressed and uniform composite films are formed. We further perform a detailed study of the influence of various processing parameters including silica/polyvinylpyrrolidone concentration, substrate temperature, nozzle-to-substrate distance, and number of spray-passes on film roughness and thickness. By increasing the number of spray-passes from 10 to 30, the film thickness from 120 to 340 nm is modulated, resulting in different colors, and large-area and uniform colors on commercial round silicon wafers with 15 cm diameter are achieved. The silica/polyvinylpyrrolidone composite films show strong hydrophilicity and are sensitive to humidity changes, leading to quickly tunable and reversible structural colors. Quartz crystal microbalance with dissipation demonstrates water vapor adsorption and condensation on the nanofilm when increasing environmental humidity. Thereby, ultrasonic spray-coating as a novel film fabrication technique provides a feasible scheme for large-area preparation of intelligent structural colors.

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Concentration and diffusion of the redox probe as key parameters for label-free impedimetric immunosensing

Lacina

Věžník²,

Sopoušek³

et al. 2023

Bioelectrochemistry

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Thick nanoporous matrices of polystyrene nanoparticles and their potential for electrochemical biosensing

Cited by 5 publications

References 22 publications

Diffusion Behavior of Analyte Molecules in a Nanoporous Matrix Created from Polystyrene Nanoparticles

Diffusion Behavior of Analyte Molecules in a Nanoporous Matrix Created from Polystyrene Nanoparticles

Large-Area Fabrication of Structurally Colored and Humidity Sensitive Composite Nanofilm via Ultrasonic Spray-Coating

Concentration and diffusion of the redox probe as key parameters for label-free impedimetric immunosensing

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