Interconnected electrocatalytic Pt-metal networks by plasma treatment of nanoparticle-peptide fibril assemblies

Abstract

Noble metal catalysts possess outstanding catalytic behaviors, photocatalysis, electrocatalysis and many other applications, when interconnected via peptide fibrils.

Recent Advances in Bio‐Templated Metallic Nanomaterial Synthesis and Electrocatalytic Applications

“…ORR tests in air‐saturated H 2 SO 4 showed that the peak for catalytic reduction current occurred at more positive potential with a Pt‐AFP fibril modified electrode than with Pt NPs modified and bulk Pt electrodes [162] . Based on this work, Bandak et al [161] . used O 2 ‐plasma to remove the peptide and the organic stabilizer to further investigate the effect of the capping agent and the peptide on the catalytic performance of the hybrid system, resulting in an interconnected Pt nanonetwork.…”

Trends on Synthesis of Polymeric Nanocomposites Based on Green Chemistry

“…Once the PNCs has been manufactured, in various applications are sought to have certain specific surface properties to improve its performance. For example, cleaning and conditioning the surface of the PNCs, enhancing the adhesion of coatings [124], generating antimicrobial properties [120,124,125], chemical resistance [122], catalytic activity [126], among others. In other cases, the objective is to expose NPs that became embedded in the polymer matrix during the manufacturing process by molecular fragmentation (impact ion process) on the PNCs [127].…”

“…A novel application was to treat peptide fiber electrodes with polyaniline containing platinum NPs. The result was increased electrocatalytic activity due to oxygen plasma treatment which, according to the authors, has application potential in fuel cell electrodes and in miniature devices and microfluidic chips [126]. Argon has also been utilized as a gas to modify the surface of nanocomposite membranes with cobalt NPs with a thickness of 20 microns, and it has been found that treatment with Ar generated a surface roughing of the membranes, which improves the surface and chemical properties of the membrane [133].…”

Growth, Polymorphism, and Spatially Controlled Surface Immobilization of Biotinylated Variants of IAPP21–27 Fibrils

“…The assembly of soluble peptide or protein monomers into fibrillar supramolecular structures, consisting of intermolecular hydrogen-bonded β-sheets, is associated with serious degenerative diseases, such as Alzheimer’s disease, type 2 diabetes, and other misfolding disorders. , Despite their physiological role, amyloid fibrils are promising tools for applications in nanoelectronics, biosensing, and separation technologies. − The preparation of amyloid fibrils in bulk quantities, from readily available low-cost materials, could increase their commercial potential in the near future . The advantage to control the properties of these supramolecular structures by tailoring the primary peptide sequence of the monomers is a unique feature which enables a high flexibility in material design.…”

“…The ability to control fibril morphology and fibrillation kinetics enables to tailor their specific properties and function. , Amyloid fibril morphologies can differ in length, diameter, and twist angle. − It has been shown that the length of fibrils influences its cytotoxicity and has an impact on the membrane stability in a physiological environment. , The fibril morphology is determined by its flexibility or stiffness that results from the intermolecular forces and amino acid side-chain properties. , A uniform or homogeneous morphology of fibrils is hardly achievable in vitro . Amyloid fibrils exist in a variety of structural forms, and it has been shown that the alteration of the solution conditions may favor a particular morphology. , For technical applications, the fibrillation time and the option to control the fibrillation process, e.g., to trigger the start of fibrillation, play a crucial role.…”