Technology-driven layer-by-layer assembly of nanofilms

Richardson, Joseph J.; Björnmalm, Mattias; Caruso, Frank

doi:10.1126/science.aaa2491

Cited by 1,396 publications

(1,023 citation statements)

References 101 publications

(231 reference statements)

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“…4 The development of fast, inexpensive, and up-scalable fabrication methods for stratified systems is a key challenge in materials science. 5,6 Here, we introduce a method to obtain self-assembled stratified coatings, along with a simple means to form homogeneous coatings, when desired, using the same starting materials.…”

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confidence: 99%

“…19 A means to adjust stratification without altering the starting composition or the deposition method would offer a huge efficiency gain over conventional fabrication technology. 6,[20][21][22] Our vision in the design of a switchable, stratified coating is to draw upon insights from our earlier work 23 to bring together two different materials technologies: colloidal stratification and pH-responsive particles. Here, we show how the stratification of binary particle blends can be switched off (or on) simply by raising (or lowering) the pH of the initial dispersion.…”

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confidence: 99%

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pH-Switchable Stratification of Colloidal Coatings: Surfaces “On Demand”

Martín-Fabiani

Fortini

Haye

et al. 2016

ACS Appl. Mater. Interfaces

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Stratified coatings are used to provide properties at a surface, such as hardness or refractive index, which are different from underlying layers. Although time-savings are offered by self-assembly approaches, there have been no methods yet reported to offer stratification on demand. Here, we demonstrate a strategy to create self-assembled stratified coatings, which can be switched to homogenous structures when required. We use blends of large and small colloidal polymer particle dispersions in water that self-assemble during drying because of an osmotic pressure gradient that leads to a downward velocity of larger particles. Our confocal fluorescent microscopy images reveal a distinct surface layer created by the small particles. When the pH of the initial dispersion is raised, the hydrophilic shells of the small particles swell substantially, and the stratification is switched off. Brownian dynamics simulations explain the suppression of stratifi-cation when the small particles are swollen as a result of reduced particle mobility, a drop in the pressure gradient, and less time available before particle jamming. Our strategy paves the way for applications in antireflection films and pro-tective coatings in which the required surface composition can be achieved on demand, simply by adjusting the pH prior to deposition

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confidence: 99%

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confidence: 99%

pH-Switchable Stratification of Colloidal Coatings: Surfaces “On Demand”

Martín-Fabiani

Fortini

Haye

et al. 2016

ACS Appl. Mater. Interfaces

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“…Regarding the coating strategy, the layer-by-layer assembly protocol of immersing seeds into solutions of desired materials has been a successful practice for anchoring different species. 29 However, such an immersion process is also well known for its shortcomings; the process is time consuming and it must be carefully operated to produce a satisfactory coating. Kim et al 18 reported a synthetic strategy to construct the core-shell structure of MWCNTs@FePO 4 , which required the alternate immersion of the substrate material into an Fe 3+ solution and a H 2 PO 4 − solution several times.…”

Section: Introductionmentioning

confidence: 99%

Kinetically controlled formation of uniform FePO4 shells and their potential for use in high-performance sodium ion batteries

et al. 2017

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Amorphous iron phosphates are potential cathode materials for sodium ion batteries. The amorphous FePO 4 matrix is able to insert/extract sodium ions reversibly without apparent structural degradation, resulting in stable performance during the charge/discharge process. However, the extremely low electronic conductivity of FePO 4 itself becomes a formidable obstacle for its application as a high-performance cathode material. Here, by tuning the growth kinetics of FePO 4 in an aqueous solution, we were able to control its formation onto a large variety of substrates, forming uniform core-shell structures. Specifically, the use of multiwalled carbon nanotubes as the core material together with the growth control of FePO 4 produced the core-shell structure of MWCNTs@FePO 4 with a delicately controlled shell thicknesses. We confirmed that such a nanocomposite can act as an effective cathode material by taking advantage of both the highly conductive core and the electrochemically active shell, leading to improved battery performance as revealed by the high discharge capacity and the greatly improved rate capability. We anticipate that our progress in FePO 4 control offers new potential in different research fields, such as materials chemistry, catalysis and energy storage devices.

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“…Another new element in our approach, compared to the previous numerical and experimental studies of the patchy particles, is the use of layer-by-layer growth protocol. This is a well known technique in material science and chemical engineering [23][24][25], and as we show below, it can be employed in the context of patchy particles to create periodic structures of exceptional quality.…”

Section: Introductionmentioning

confidence: 99%

Layer-by-layer assembly of patchy particles as a route to nontrivial structures

Patra

Tkachenko

2017

Phys. Rev. E

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We propose a new strategy for robust high-quality self-assembly of non-trivial periodic structures out of patchy particles, and investigate it with Brownian Dynamics (BD) simulations. Its first element is the use of specific patch-patch and shell-shell interactions between the particles, that can be implemented through differential functionalization of patched and shell regions with specific DNA strands.The other key element of our approach is the use of layer-by-layer protocol that allows to avoid a formations of undesired random aggregates. As an example, we design and self-assemble "in silico" a version of a Double Diamond (DD) lattice in which four particle types are arranged into BCC crystal made of four FCC sublattices. The lattice can be further converted to Cubic Diamond (CD) by selective removal of the particles of certain types. Our results demonstrate that by combining the directionality, selectivity of interactions and the layer-by-layer protocol, a high quality robust self-assembly can be achieved. * oleksiyt@bnl.gov 2

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Technology-driven layer-by-layer assembly of nanofilms

Cited by 1,396 publications

References 101 publications

pH-Switchable Stratification of Colloidal Coatings: Surfaces “On Demand”

pH-Switchable Stratification of Colloidal Coatings: Surfaces “On Demand”

Kinetically controlled formation of uniform FePO4 shells and their potential for use in high-performance sodium ion batteries

Layer-by-layer assembly of patchy particles as a route to nontrivial structures

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