Processing of nanomaterials in Layer-by-Layer films: Potential applications in (bio)sensing and energy storage

Abstract

Layer-by-Layer films: Potential applications in (bio)sensing and energy storage. An Acad Bras Cienc 91: e20181343.

A Bidimensional Gay-Berne Calamitic Fluid: Structure and Phase Behavior in Bulk and Strongly Confined Systems

“…An outstanding matter with an eye toward 3D metamaterials is how disclinations couple when colloidal slabs are stacked. Practicable systems could extend layer-by-layer protocols [7,89,90,[168][169][170][171][172][173][174][175][176][177][178][179][180], thus expanding the gamut of metamaterials attainable by conventional 3D-based methods. Studies on the switching mechanics by applying external fields (as opposed to thermal tempering) would be of interest in the production of devices and associated technologies.…”

Beyond Bulk Gay-Berne fluids: An outlook on mesogenic mixtures with molecular dynamics simulations

“…In a subsequent step, 3D metamaterials form by stacking the slabs. Practicable layer-by-layer protocols [177][178][179][180][181][182][183][184][185][186][187][188][189][190][191][192] have the potential to broaden the gamut of materials attained by conventional 3D-based methods. Surfactant dispersions used to confine LC samples can be used to encode spatial information leading to specific arrangements [66,67].…”

Layer-by-Layer Films with CoFe2O4Nanocrystals and Graphene Oxide as a Sensitive Interface in Capacitive Field-Effect Devices

“…Concerning the using of nanomaterials (e.g., GO, carbon nanotubes, and diverse other nanoparticles) as receptor layers in (bio)­sensors, one should consider the ideal manipulation for incorporating such materials into sensor devices. In this case, the layer-by-layer (LbL) technique is an effective method as it allows us to build up nanofilms controlling the architecture and interaction among materials at the molecular level. − The technique is based on electrostatic interactions between alternated deposition of layers of cationic and anionic substances in aqueous solutions on solid substrates. − The experimental simplicity of this method is advantageous as it can combine several polyelectrolytes, nanomaterials, and enzymes in the form of nanostructured films with synergisms among them. − Regarding sensing applications, the LbL method has been usually employed to modify electrodes and probe surfaces to create specific receptor layers in diverse sensing platforms. − …”

“…Field-effect devices (FEDs) represent a well-known and well-established silicon-based sensor platform that benefits from the performance when a LbL film is incorporated in their structure. ,,, The capacitive electrolyte–insulator–semiconductor (EIS) sensor is a subclass of this FED that permits the integration of different types of materials in a simplified way without additional photolithographic patterning. ,, The sensor operating principle with an EIS structure arises from the modulation of its capacitance, which is caused by changes in the solid–liquid interface created by the contact of the target analyte in solution with the sensor surface. Changes are generated from variations in pH or concentration of ions from charged species in solution or enzymatic reactions. ,, The incorporation of nanomaterials on EIS devices using the LbL method exhibits sensors with enhanced properties, which is caused by the synergistic effect between the materials.…”

“…30−32 Field-effect devices (FEDs) represent a well-known and well-established silicon-based sensor platform that benefits from the performance when a LbL film is incorporated in their structure. 30,31,34,35 The capacitive electrolyte−insulator−semiconductor (EIS) sensor is a subclass of this FED that permits the integration of different types of materials in a simplified way without additional photolithographic patterning. 30,34,35 The sensor operating principle with an EIS structure arises from the modulation of its capacitance, which is caused by changes in the solid−liquid interface created by the contact of the target analyte in solution with the sensor surface.…”