Electrical circuits from capillary flow driven evaporation deposition of carbon nanotube ink in non-porous V-grooves

Shao, Fenfen; Ng, Tuck Wah; Fu, Jianzhong; Shen, Wei; Ling, William Yeong Liang

doi:10.1016/j.jcis.2011.07.019

Cited by 13 publications

(16 citation statements)

References 26 publications

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“…Assuming that the laser impact does not change the surface energy, in the light of an aqueous ink composition, the wetting directly after printing should be favored at the areas of the exposed PET surface where the carbon has been removed and not on the remaining parts of the carbon sub‐layer themselves. This step resembles the wicking technology in microfluidics recently reported by Shao et al where a Laplace pressure is utilized to fill channels with a liquid 31…”

Section: Resultsmentioning

confidence: 99%

“…Vertically stacked devices can be achieved with roll‐to‐roll or sheet‐based deposition techniques, but they require the inclusion of subtractive techniques for a patterning of the multilayers after deposition. Reviewing the individual progress in several disciplines of mechanical engineering in recent years, viable concepts for an integration of additive (coating, printing, dispensing) with transformational (surface‐energy patterning,27 sintering,28, 29 print‐and‐drag,30 forced drying31) and subtractive (roll‐to‐roll liftoff,32 dry‐phase patterning,33 laser ablation34, 35) techniques could be developed in the context of roll‐to‐roll or sheet‐fed manufacturing. The hybrid approach is currently discussed in organic and inorganic thin‐film photovoltaics, where large‐area coated film stacks are patterned via laser ablation into separate individual photovoltaic cells 35.…”

Section: Introductionmentioning

confidence: 99%

“…Although there are some good arguments for all‐printed device manufacturing without any subtractive techniques for low‐cost electronic applications31, 36 or photovoltaics,37, 38 the introduction of subtractive steps can be interesting for large‐area formats (e.g., DIN A4). As discussed above, when the totally coated area increases, the relative amount of removed material is small and the benefits of a more versatile or robust device geometry may win over the purely economic fact that some costly material has to be removed.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Simplified Large‐Area Manufacturing of Organic Electrochemical Transistors Combining Printing and a Self‐Aligning Laser Ablation Step

Blaudeck¹,

Ersman²,

Sandberg³

et al. 2012

Adv Funct Materials

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Table of content:We report on a hybrid sheet-based manufacturing approach for organic electrochemical transistors comprising printing and a self-aligning laser ablation step. AbstractWe report on a hybrid manufacturing approach for organic electrochemical transistors (OECTs) on flexible substrates. The technology is based on conventional and digital printing (screen and inkjet printing), laser processing, and post-press technologies. A careful selection of the conductive, dielectric and semiconductor materials with respect to their optical properties enables a self-aligning pattern formation which results in a significant reduction of the usual registration problems during manufacturing. For the prototype OECTs, based on this technology, we obtained on/off ratios up to 600 and switching times of 100 milliseconds at gate voltages in the range of 1 V.3

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Simplified Large‐Area Manufacturing of Organic Electrochemical Transistors Combining Printing and a Self‐Aligning Laser Ablation Step

Blaudeck¹,

Ersman²,

Sandberg³

et al. 2012

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

“…CCs could be applied wherever there is a need for hands-off liquid handling with small to high throughput, including: diagnostics, education, cell culture, chemical synthesis, or drug screening. New developments in CCs may enable applications beyond the ones reviewed here, such as capillary-based cooling systems, 134 self-assembly, 135 manufacture of electric circuits, 136 and electronic packaging.…”

Section: Discussionmentioning

confidence: 99%

Capillary microfluidics in microchannels: from microfluidic networks to capillaric circuits

et al. 2018

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Microfluidics offer economy of reagents, rapid liquid delivery, and potential for automation of many reactions, but often require peripheral equipment for flow control. Capillary microfluidics can deliver liquids in a pre-programmed manner without peripheral equipment by exploiting surface tension effects encoded by the geometry and surface chemistry of a microchannel. Here, we review the history and progress of microchannel-based capillary microfluidics spanning over three decades. To both reflect recent experimental and conceptual progress, and distinguish from paper-based capillary microfluidics, we adopt the more recent terminology of capillaric circuits (CCs). We identify three distinct waves of development driven by microfabrication technologies starting with early implementations in industry using machining and lamination, followed by development in the context of micro total analysis systems (μTAS) and lab-on-a-chip devices using cleanroom microfabrication, and finally a third wave that arose with advances in rapid prototyping technologies. We discuss the basic physical laws governing capillary flow, deconstruct CCs into basic circuit elements including capillary pumps, stop valves, trigger valves, retention valves, and so on, and describe their operating principle and limitations. We discuss applications of CCs starting with the most common usage in automating liquid delivery steps for immunoassays, and highlight emerging applications such as DNA analysis. Finally, we highlight recent developments in rapid prototyping of CCs and the benefits offered including speed, low cost, and greater degrees of freedom in CC design. The combination of better analytical models and lower entry barriers (thanks to advances in rapid manufacturing) make CCs both a fertile research area and an increasingly capable technology for user-friendly and high-performance laboratory and diagnostic tests.

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“…Spatial variations of the surface energy on a chemically patterned surface can be used for a selective material deposition and therefore the creation of functional micro and nanostructures. Such approaches have been demonstrated, e.g., for organic thin-film transistors (OTFTs) fabricated by liquid processing on silicon wafers, [20] conductive polymer layers to OTFTs deposited by high-speed roll-to-roll printing, [21] and microscopically narrow conductive networks obtained by capillaryflow-driven evaporation deposition in printed devices with planar [22] or vertical [23] geometry. Further, a spatial control of surface wetting in microfluidic channels by SAMs [24] or local surface charges for "open-air" microfluidic applications [25] are reported.…”

Section: Introductionmentioning

confidence: 99%

Self‐Assembly of Ordered Colloidal Nanoparticle Films in Few‐Micron Wide Laser‐Desorbed Lines of Octadecylsiloxane Monolayers on Silicon Oxide Surfaces

et al. 2014

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We report about a maskless technique to deposit colloidal polystyrene particles in patterned stripes with a line width as narrow as 1.5 μm. Our approach is based on the digital patterning of a hydrophobic octadecylsiloxane self-assembled monolayer (SAM) on a silicon oxide surface by laser-assisted decomposition and desorption of its organic parts. For hydrophilic stripes of the micropatterned SAM area down to widths of approximately 1.5 μm, we observed ordered, mainly monolayered stripes of colloidal polystyrene nanoparticles using a modified vertical deposition technique, dipping the silicon substrate into a colloidal suspension at an angle of around 45° with respect to the surface normal of the liquid. The mechanism of this so-called “slope self-assembly” [Wu et al., Langmuir 2013, 29, 14017] and its limitations with respect to stacking can be explained in the framework of a meniscus moving along the steps of alternating surface energy with the decreasing width of the hydrophilic stripes during the deposition process [Fustin et al., Langmuir 2004, 20, 9114]

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Electrical circuits from capillary flow driven evaporation deposition of carbon nanotube ink in non-porous V-grooves

Cited by 13 publications

References 26 publications

Simplified Large‐Area Manufacturing of Organic Electrochemical Transistors Combining Printing and a Self‐Aligning Laser Ablation Step

Simplified Large‐Area Manufacturing of Organic Electrochemical Transistors Combining Printing and a Self‐Aligning Laser Ablation Step

Capillary microfluidics in microchannels: from microfluidic networks to capillaric circuits

Self‐Assembly of Ordered Colloidal Nanoparticle Films in Few‐Micron Wide Laser‐Desorbed Lines of Octadecylsiloxane Monolayers on Silicon Oxide Surfaces

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