Patterning Phase Separation in Polymer Films with Dip-Pen Nanolithography

Coffey, David C.; Ginger, David S.

doi:10.1021/ja0428917

Cited by 89 publications

(102 citation statements)

References 32 publications

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“…For example, spin-coating of polymer blends of poly-3-hexylthiphenene/polystyrene (P3HT/PS) on mercaptohexadecanoic acid (MHA) dot-patterned Au substratum results in the spontaneous formation of nanoscale polymer structure that is attributed to heterogeneous nucleation of P3HT on MHA patterns. [ 26 ] Single-walled carbon nanotube (SWCNT) and other building-blocks were also used to form two-dimensional arrays using DPN-synthesized nano-chemical contrast. [ 23 , 27 ] Furthermore, DPN can be used to fabricate nanohole arrays and lithographic masters.…”

Section: Progress Reportmentioning

confidence: 99%

Biomimetic Nanopatterns as Enabling Tools for Analysis and Control of Live Cells

et al. 2010

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It is becoming increasingly evident that cell biology research can be considerably advanced through the use of bioengineered tools enabled by nanoscale technologies. Recent advances in nanopatterning techniques pave the way for engineering biomaterial surfaces that control cellular interactions from the nano- to the microscale, allowing more precise quantitative experimentation capturing multi-scale aspects of complex tissue physiology in vitro. The spatially and temporally controlled display of extracellular signaling cues on nanopatterned surfaces (e. g., cues in the form of chemical ligands, controlled stiffness, texture, etc.) that can now be achieved on biologically relevant length scales is particularly attractive enabling experimental platform for investigating fundamental mechanisms of adhesion-mediated cell signaling. Here, we present an overview of bio-nanopatterning methods, with the particular focus on the recent advances on the use of nanofabrication techniques as enabling tools for studying the effects of cell adhesion and signaling on cell function. We also highlight the impact of nanoscale engineering in controlling cell-material interfaces, which can have profound implications for future development of tissue engineering and regenerative medicine.

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Section: Progress Reportmentioning

confidence: 99%

Biomimetic Nanopatterns as Enabling Tools for Analysis and Control of Live Cells

et al. 2010

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“…Ginger and coworkers reported phase separation into uniform geometries by patterned templates down to $150 nm by dip-pen nanolithography (DPN). [17,18] The disadvantage of DPN is that the sizes of templates that can be patterned are currently limited. To date, none of the published studies reported the preparation of complex, nonuniform patterns by directed assembly of polymer blends.…”

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confidence: 99%

Directed Assembly of Polymer Blends Using Nanopatterned Templates

et al. 2009

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The direct assembly of polymer blends on chemically functionalized surfaces is shown to produce a variety of nonuniform complex patterns. This method provides a powerful tool for easily producing nonuniform patterns in a rapid (30 s), one‐step process with high specificity and selectivity for a variety of applications, such as nanolithography, polymeric optoelectronic devices, integrated circuits, and biosensors.

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“…Lateral phase separation of polymeric blends has been demonstrated as well but no functional devices were obtained. [14][15][16] In this work, we show that in a single process both vertical and lateral phase separation of two materials having different electronic functionality can be controlled in order to form isolated device patterns. Thus, we demonstrate a first step in the direction of spontaneous assembly of thinfilm circuits from solution.…”

mentioning

confidence: 83%

“…Therefore, we rule out preferential adsorption of PQT-12 on OTS as a phase separation mechanism. [14] Instead, we propose that phase separation on OTS-treated surfaces proceeds via surface-directed spinodal decomposition. [22] PQT-12 is less soluble than PMMA in dichlorobenzene.…”

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confidence: 93%

Solution Based Self‐Assembly of an Array of Polymeric Thin‐Film Transistors

Salleo

Arias

2007

Advanced Materials

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Printing electronic circuits on flexible substrates at low cost is widely held to be a truly disruptive technology. [1,2] As a consequence, there has been much recent interest in developing electrically functional materials in liquid form. For instance, conjugated polymers are suitable semiconducting materials for printed electronics because they can be dissolved in organic solvents.[3] The goal of this technology is to make manufacturing of electronic devices akin to roll-to-roll color printing, where the electronic materials play the role of the color inks. However, another long-standing promise of solutionprocessed electronics is the prospect that a blend of materials in solution can self-assemble on a substrate to form complex circuits. Here we show the spontaneous self-organization of a semiconductor/insulator mixture into an electronic circuit comprising tens of devices. A regular array of 64 isolated polymeric thin-film-transistors (TFTs) with a yield higher than 95 % is self-assembled from solution. The individual devices perform identically to polymeric TFTs made by conventional means and their off-current is typically smaller than 1 pA, indicating a high degree of device isolation. This work constitutes the first step towards self-assembly of multi-layer, multi-device circuits out of solution. By patterning different surface functionalities we envisage that multi-component solutions can be brought to selectively phase separate on designated areas of a substrate, thereby leading to the formation of entire functional thin-film systems in a single solutionbased process. Hierarchical structures can be made to emerge spontaneously from a solution via control of the interactions between the different materials and the substrate. [4,5] For in-

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Patterning Phase Separation in Polymer Films with Dip-Pen Nanolithography

Cited by 89 publications

References 32 publications

Biomimetic Nanopatterns as Enabling Tools for Analysis and Control of Live Cells

Biomimetic Nanopatterns as Enabling Tools for Analysis and Control of Live Cells

Directed Assembly of Polymer Blends Using Nanopatterned Templates

Solution Based Self‐Assembly of an Array of Polymeric Thin‐Film Transistors

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