Fabrication of Layer-by-Layer Self-Assembly Films Using Roll-to-Roll Process

Abstract

In this research, we fabricated thin films deposited on poly(ethylene terephthalate) (PET) films by a layer-by-layer self-assembly method using a roll-to-roll process and measured the morphology and transmittance of the thin films using atomic force microscopy (AFM) (nanoscope IIIa, Digital Instruments) and UV-vis spectroscopy (Filmetrics, Inc). The thin films consisting of poly(allylamine hydrochloride), (PAH) adjusted to pH 7.5 and poly(acrylic acid) (PAA) adjusted to pH 3.5 showed a textured structure on moving film substrates. From these results, we found that polyelectrolyte multilayer (PEM) thin films showing similar to those structures of the films fabricated using a conventional dipping process were successfully assembled via the roll-to-roll process. We consider that this roll-to-roll process is suitable for fabricating large-area thin films.

Design of Multilayered Nanostructures and Donor–Acceptor Interfaces in Solution‐Processed Thin‐Film Organic Solar Cells

“…In particular, the layer-by-layer deposition technique is useful for industrial application because it has already been applied to roll-to-roll processes for large-area fabrication. [53,54] …”

Highly Transparent Conductive Sheet by Self-assembled Silver Network Electrodes with Antireflective Coating via Roll-to-Roll Process

“…Aqueous solutions of Titanium (IV) bis-(ammonium lactate) dihydroxide (TALH), Sodium Silicate (Na 2 SiO 3 ) , and SiO 2 nanoparticles were used as the negatively charged solutions. Single-block AR as (PDDA/SiO 2 ) 8 and double-block AR as (PDDA/TALH) 20 /(PDDA/Na 2 SiO 3 ) 40 coated on silver network electrode using LBL method [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Here, (A/B) n indicate that A is used as cation, B is used as anion and l (A/B) layer-by layer films are deposited n bilayers.…”

“…Moreover, Layer-by-layer (LBL) self-assembled multilayer films are constructed from various nano scale order materials on three dimensional substrates such as optical lenses [12], particles [13] and mesh substrate [14]. And it can fabricate functional nano structural film via roll-to-roll process [15][16][17]. Up to nowadays, most of the transparent conductive films are indium tin oxide (ITO) film which used rare metal, and produced using vacuum processing.…”

Assembly and Electronic Applications of Colloidal Nanomaterials

“…In addition to perovskite nanosheets, Ti x O 2 and graphene oxide have been LB-assembled into large-scale thin films with dielectric constants of ≈120 and ≈3, respectively. [232,455] During LBL assembly, randomly adsorbed nanosheets cover the substrates with a partial overlap, and post-sonication drives the nanosheets to tile in a manner similar to LB assembly. [450] LBL assembly is an alternative strategy for fabricating ultrathin dielectric films from 2D nanosheets.…”

“…In comparison to LB assembly, LBL assembly is easier and faster to implement, and is compatible with highly scalable R2R processes. [232,455] During LBL assembly, randomly adsorbed nanosheets cover the substrates with a partial overlap, and post-sonication drives the nanosheets to tile in a manner similar to LB assembly. [456] The effectiveness of this process is exemplified by the assembly of DGU-sorted h-BN and MTM.…”