Mesoporous ordered films <i>via</i> self-assembly: trends and perspectives

Innocenzi, Plinio

doi:10.1039/d2sc04828k

Cited by 15 publications

(15 citation statements)

References 111 publications

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“…48 The EISA and EASA synthetic methodologies have been discussed in-depth in several reviews, to which the interested reader is redirected. 6,12,28,29,69,70 However, we can summarize some common features that lead to MTFs with highly organized pore arrays. Both EISA and EASA are based on the spontaneous assembly (self-assembly) of the inorganic species and the template counterparts (co-assembly).…”

Section: General Methods To Obtain Mesoporous Electrodesmentioning

confidence: 99%

“…As the boronic acid moiety can selectively bind to F − , the negative charges rise, electrostatically excluding the ferricyanide anions through the ultrasmall silica nanochannel to the underlying electrode. Therefore, the decreased redox response of Fe(CN) 6 3− is related to the amount of F − . Similarly, Karman et al 137 developed an indirect detection method, focused on amplifying the voltammetric responses of anionic redox probes (Fe(CN) 6…”

Section: Charge-based Selectionmentioning

confidence: 99%

“…The combination of chemical synthesis and supramolecular templating leads to spatially organized arrays of mesopores (i.e., 2–50 nm in diameter). Functionalization of the inorganic walls, mesopore surfaces, or pore volume with molecular, biomolecular, or nanostructured functions leads to multifunctional matrices with large available surface area and tailorable interfacial properties, leading to applications in several fields: biomedical, analytical, or energy. − …”

Section: Introductionmentioning

confidence: 99%

“…These innovative materials can be processed as Mesoporous Thin Films (MTFs) that display controllable thickness, highly organized, and tunable pore systems as well as a versatile framework composition. Ideally, these systems should present high chemical and mechanical stability in order to be applied in optical, optoelectronic, or electrochemical devices. ,− Since the first reports on mesoporous thin films through surfactant-templated synthesis, − the field has emerged and their use and applications have been widely extended to solar cells, , batteries and supercapacitors for energy storage, , photocatalysis, separation and/or adsorption membranes, photochromic devices, photonics, sensors, and biosensors, among others.…”

Section: Introductionmentioning

confidence: 99%

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Ordered Mesoporous Electrodes for Sensing Applications

et al. 2023

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Electrochemical sensors have become increasingly relevant in fields such as medicine, environmental monitoring, and industrial process control. Selectivity, specificity, sensitivity, signal reproducibility, and robustness are among the most important challenges for their development, especially when the target compound is present in low concentrations or in complex analytical matrices. In this context, electrode modification with Mesoporous Thin Films (MTFs) has aroused great interest in the past years. MTFs present high surface area, uniform pore distribution, and tunable pore size. Furthermore, they offer a wide variety of electrochemical signal modulation possibilities through molecular sieving, electrostatic or steric exclusion, and preconcentration effects which are due to mesopore confinement and surface functionalization. In order to fully exploit these advantages, it is central to develop reproducible routes for sensitive, selective, and robust MTF-modified electrodes. In addition, it is necessary to understand the complex mass and charge transport processes that take place through the film (particularly in the mesopores, pore surfaces, and interfaces) and on the electrode in order to design future intelligent and adaptive sensors. We present here an overview of MTFs applied to electrochemical sensing, in which we address their fabrication methods and the transport processes that are critical to the electrode response. We also summarize the current applications in biosensing and electroanalysis, as well as the challenges and opportunities brought by integrating MTF synthesis with electrode microfabrication, which is critical when moving from laboratory work to in situ sensing in the field of interest.

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Section: General Methods To Obtain Mesoporous Electrodesmentioning

confidence: 99%

Section: Charge-based Selectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ordered Mesoporous Electrodes for Sensing Applications

et al. 2023

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“…Mesoporous thin films obtained via evaporation-induced self-assembly are characterized by an array of monodispersed pores with a defined symmetry and space group. , The organized, monodispersed mesoporosity (2–50 nm) has the advantage of ensuring reproducible control of surface area per gram of matter. Another advantage is the modulation of diffusivity because the pore shape, dimension, and orientation can be precisely predefined through the design of the topological distribution of mesoporosity. − The ordered mesoporosity also represents an ideal platform for hosting nanoparticles, enabling the preparation of nanocomposites where the dispersed phase follows the mesopore structural organization. , Several heterostructures between oxide, metallic, and semiconductor nanoparticles and mesoporous matrices have been reported in the literature. − Ceria nanoparticles that have been nucleated in a preformed titania matrix through deep X-ray lithography are a significant example of this strategy . Mesoporous ordered silica films having either spherical or cylindrical pores, for instance, have been used to grow FeCo nanocrystals, with the nanopore diameter that gives the upper limit for the nanoparticle size .…”

Section: Introductionmentioning

confidence: 99%

Chemical Design of Efficient Photoelectrodes by Heterogeneous Nucleation of Carbon Dots in Mesoporous Ordered Titania Films

Herrera,

Sireus,

Rassu

et al. 2023

Chem. Mater.

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The design of efficient and highly durable photoelectrodes requires innovative solutions that can be integrated into thin-film-based technologies. Mesoporous ordered titania, which is characterized by an organized porosity in the 2−10 nm range, represents an ideal matrix for such a purpose. One of the main challenges is the homogeneous and controlled incorporation of photoactive nanoparticles inside the matrix. Titania-carbon dots (C-dots) heterostructures represent promising candidates, but a method to homogeneously introduce C-dots in mesoporous films is still missing. In the present work, C-dots have been nucleated and grown within a mesoporous titania film through in situ solvothermal synthesis. The process promotes the crystallization of titania anatase at low temperatures and at the same time allows the formation of carbon dots without disruption of the porous ordered structure. The process allows building a high-performance nanocomposite as an electrode for oxygen evolution reactions. Photocurrent production under different illumination conditions was measured by linear sweep voltammetry and chronoamperometry. When exposed to a solar simulator, the nanocomposite electrodes yield an increase in photocurrent compared to bare TiO 2 matrices. The better performance has been associated with the presence of C-dots acting as active light-harvesting sites and as charge donors to the photoactive centers of the titania film.

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Mesostructured Materials with Controllable Long‐Range Orientational Ordering and Anisotropic Properties

Jahnke,

Kim,

Wildemuth

et al. 2023

Advanced Materials

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Inorganic‐organic mesophase materials provide a wide range of tunable properties, which are often highly dependent on their nano‐, micro‐, or meso‐scale compositions and structures. Among these are macroscopic orientational order and corresponding anisotropic material properties, the adjustability of which are difficult to achieve. This is due to the complicated transient and coupled transport, chemical reaction, and surface processes that occur during materials syntheses. By understanding such processes, general criteria are established and used to prepare diverse mesostructured materials with highly aligned channels with uniform nanometer dimensions and controllable directionalities over macroscopic dimensions and thicknesses. This is achieved by using a micropatterned semipermeable poly(dimethylsiloxane) stamp to manage the rates, directions, and surfaces at which self‐assembling phases nucleate and the directions that they grow. This enables mesostructured surfactant‐directed silica and titania composites, including with functional guest species, and mesoporous carbons to be prepared with high degrees of hexagonal order, as well as controllable orthogonal macroscopic orientational order. The resulting materials exhibit novel anisotropic properties, as demonstrated by the example of direction‐dependent photocurrent generation, and are promising for enhancing the functionality of inorganic‐organic nanocomposite materials in separations, catalysis, and energy conversion applications.This article is protected by copyright. All rights reserved

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Mesoporous ordered films via self-assembly: trends and perspectives

Abstract: The synthesis of ordered mesoporous films via self-assembly represents one of the main accomplishments in nanoscience. In fact, controlling the complex chemical-physical phenomena that govern the process triggered by the...

Cited by 15 publications

References 111 publications

Ordered Mesoporous Electrodes for Sensing Applications

Ordered Mesoporous Electrodes for Sensing Applications

Chemical Design of Efficient Photoelectrodes by Heterogeneous Nucleation of Carbon Dots in Mesoporous Ordered Titania Films

Mesostructured Materials with Controllable Long‐Range Orientational Ordering and Anisotropic Properties

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