Directed assembly of nanomaterials using electrospray deposition and substrate-level patterning

Zhu, Yuxuan; Chiarot, Paul R.

doi:10.1016/j.powtec.2020.01.066

Cited by 18 publications

(26 citation statements)

References 24 publications

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“…The effects of target geometry and topography have shown great potential for high-efficiency patterning. For example, charged and insulating stencil masks have been applied to template the spray [15][16][17][18][19][20] . Higuchi et al 15 demonstrated the focusing effects of different designs of non-conductive stencil masks to change the size of nanoparticle deposits.…”

Section: Self-limiting Electrospray Deposition On Polymer Templatesmentioning

confidence: 99%

“…Osuji et al 19 demonstrated that inverse masks of a grounded grid under a glass slide could lead to patterned deposits of polymer films. More recently, Zhu and Chiarot 20 demonstrated that the charging effects of ESD with near-field photoresist templates could result in focusing of towers of particles that greatly exceed the thickness of the mask. As shown in these examples, the focusing effects of ESD make it much more difficult to predict the amount of material that will deposit on the unmasked regions as compared to more traditional, linear patterning methods such as liftoff.…”

Section: Introductionmentioning

confidence: 99%

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Self-limiting electrospray deposition on polymer templates

Lei

Gamboa

Kuznetsova

et al. 2020

Sci Rep

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Electrospray deposition (ESD) applies a high voltage to liquids flowing through narrow capillaries to produce monodisperse generations of droplets down to hundreds of nanometers in diameter, each carrying a small amount of the delivered solute. This deposition method has been combined with insulated stencil masks for fabricating micropatterns by spraying solutions containing nanoparticles, polymers, or biomaterials. To optimize the fabrication process for micro-coatings, a self-limiting electrospray deposition (SLED) method has recently been developed. Here, we combine SLED with a pre-existing patterned polymer film to study SLED’s fundamental behavior in a bilayer geometry. SLED has been observed when glassy insulating materials are sprayed onto conductive substrates, where a thickness-limited film forms as charge accumulates and repels the arrival of additional charged droplets. In this study, polystyrene (PS), Parylene C, and SU-8 thin films of varying thickness on silicon are utilized as insulated spraying substrates. Polyvinylpyrrolidone (PVP), a thermoplastic polymer is sprayed below its glass transition temperature (Tg) to investigate the SLED behavior on the pre-deposited insulating films. Furthermore, to examine the effects of in-plane confinement on the spray, a microhole array patterned onto the PS thin film by laser dewetting was sprayed with dyed PVP in the SLED mode. This was then extended to an unmasked electrode array showing that masked SLED and laser dewetting could be used to target microscale regions of conventionally-patterned electronics.

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Section: Self-limiting Electrospray Deposition On Polymer Templatesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Self-limiting electrospray deposition on polymer templates

Lei

Gamboa

Kuznetsova

et al. 2020

Sci Rep

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show abstract

“…(A) A diagram of ES‐based particle deposition using a stencil mask. Reprinted from [189], Copyright 2020, with permission from Elsevier. (B) A spool‐like distortion that occurred when a conductive mask was held under potential.…”

Section: Processing Of Particlesmentioning

confidence: 99%

Section: Processing Of Particlesmentioning

confidence: 99%

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Electrospray: More than just an ionization source

et al. 2020

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is a potential-driven process of liquid atomization, which is employed in the field of analytical chemistry, particularly as an ionization technique for mass spectrometric analyses of biomolecules. In this review, we demonstrate the extraordinary versatility of the electrospray by overviewing the specifics and advanced applications of ESbased processing of low molecular mass compounds, biomolecules, polymers, nanoparticles, and cells. Thus, under suitable experimental conditions, ES can be used as a powerful tool for highly controlled deposition of homogeneous films or various patterns, which may sometimes even be organized into 3D structures. We also emphasize its capacity to produce composite materials including encapsulation systems and polymeric fibers. Further, we present several other, less common ES-based applications. This review provides an insight into the remarkable potential of ES, which can be very useful in the designing of innovative and unique strategies.

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Electrospray Deposition for Electronic Thin Films on 3D Freeform Surfaces: From Mechanisms to Applications

Lai,

Di,

Zhao

et al. 2024

Adv Materials Technologies

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Electronic thin films play a ubiquitous role in microelectronic devices and especially hold great promise for flexible electronics, energy conversion and storage, and biomedical applications. Their characterizations, including ultra‐thin, large‐scale dimensions, stretchability, and conformal ability to curved or 3D structures, present new challenges for thin film fabrication based on the solution method. Electrospray deposition emerges as a feasible method for fabricating large‐area, flexible, and curved films. It offers many advantages such as material adaptability, controlled atomization, tunable film morphology, and shape retention on complex substrates. These advantages make it a key method for fabricating high‐performance films on large‐area, 3D surfaces. This work presents a comprehensive review of the mechanisms, processes, applications, and equipment of electrospray deposition. First, the fundamental principles of electrospray deposition are introduced, focusing on the mechanisms and scaling laws of liquid atomization. Moreover, the control methods for electrospray modes, structures, and film morphology are discussed. These advanced control methods pave the way for the fabrication of smart skins, wearable devices, and energy conversion and storage components. Finally, this work introduces three types of electrospray deposition manufacturing equipment to illustrate the advantages of electrospray deposition for large‐area, and 3D surface manufacturing.

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Directed assembly of nanomaterials using electrospray deposition and substrate-level patterning

Cited by 18 publications

References 24 publications

Self-limiting electrospray deposition on polymer templates

Self-limiting electrospray deposition on polymer templates

Electrospray: More than just an ionization source

Electrospray Deposition for Electronic Thin Films on 3D Freeform Surfaces: From Mechanisms to Applications

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