An Approach towards the Printing of Polymer Circuits

Knobloch, A.; Bernds, A.; Clemens, W.

doi:10.1557/proc-736-d6.3

Cited by 4 publications

(4 citation statements)

References 10 publications

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“…HA cements are acid±base [4,5] or amorphous±crystalline [6] reaction systems that offer important features over thermally treated ceramics including: 1) they are moldable and unlike polymethylmethacrylate cements, can have negligible exothermic reaction on setting. [7,8] 2) Because they are not heat treated, therapeutic agents may be added to them.…”

Section: Receivedmentioning

confidence: 99%

“…[3] In particular, magnetic elements or compound-encapsulated CNTs are useful for the purposes of magnetic data storage and nanoprobes in magnetic force microscopy. Rao and co-workers have fabricated carbon-coated iron nanorods by pyrolysis of ferrocene under vacuum, [4] and Xu and coworkers employed an alumina membrane as a template to produce an ordered array of cobalt-filled CNTs. [5] However, it is still a challenge to develop a novel methodology for the large-scale fabrication of functional CNTs.…”

mentioning

confidence: 99%

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Fabrication of Magnetic Carbon Nanotubes Using a Metal‐Impregnated Polymer Precursor

Jang¹,

Yoon

2003

Advanced Materials

143

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γ‐Fe2O3‐impregnated magnetic carbon nanotubes (CNTs) have been fabricated by the carbonization of polypyrrole (PPy) nanotubes. It is found that PPy nanotubes form graphitic structures at a low temperature (800 °C). Magnetic CNTs (see Figure) show ferromagnetic behavior even at 300 K and the main magnetic phase of the CNTs is γ‐Fe2O3. This novel fabrication approach is expected to provide an alternative way to fabricate CNTs.

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Section: Receivedmentioning

confidence: 99%

mentioning

confidence: 99%

Fabrication of Magnetic Carbon Nanotubes Using a Metal‐Impregnated Polymer Precursor

Jang¹,

Yoon

2003

Advanced Materials

143

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“…However, for most liquid-based graphic-arts printing techniques, only features larger than 20 lm can be patterned reproducibly, [3] leading to poor circuit switching speeds: less than a few hundred hertz. [7,13] Top-gate FET devices were fabricated with SAP PEDOT/PSS source and drain electrodes (Fig. 2a).…”

mentioning

confidence: 99%

“…This is higher by at least two orders of magnitude than those of previously reported printed all-polymer logic devices. [7,13,25] In summary, we have developed a novel lithography-free, bottom-up nanopatterning technique which uses the unique flow properties of small liquid droplets to define with high yield and uniformity, critical features that are more than two orders of magnitude smaller than those previously achievable with straight, additive printing, and comparable to those of sophisticated state-of-the-art deep-UV or electron-beam lithography techniques. The technique is likely to be equally applicable to other liquid-based, graphic-arts printing techniques, such as gravure, offset, or screen printing.…”

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confidence: 99%

Lithography‐Free, Self‐Aligned Inkjet Printing with Sub‐Hundred‐Nanometer Resolution

et al. 2005

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Surface forces exerted on small liquid droplets on heterogeneous surfaces can be exploited for bottom±up hierarchical assembly of functional nanostructures. We demonstrate here a self-aligned additive printing technique that uses standard inkjet-printing equipment, but is capable of achieving sub-100 nm resolution without any lithographic step. Very small gaps between two printed electrodes are defined uniformly and with high yield by controlling the receding contact-line motion of liquid conductive-ink droplets that are repelled by and flow off the surface of a previously deposited electrode. We illustrate the potential of this technique by fabricating inkjet-printed polymer transistor circuits with sub-100 nm channel lengths that are more than two orders of magnitude faster than previous printed organic-transistor circuits.The application of graphic-arts printing techniques to liquid-based, additive patterning of functional materials promises to provide a new paradigm for manufacturing of large-area, low-cost electronic circuits on flexible substrates. [1,2] However, current resolution achievable with straight inkjet, offset, or gravure printing is limited to 20±50 lm. [3,4] The question of whether printing will be capable of submicrometer-feature definition is a crucial one. It will decide whether printingbased manufacturing will be able to embark on a roadmap of feature-size reductions and corresponding performance enhancements analogous to those of silicon integrated circuits, or whether the challenges of accurately positioning liquid droplets and controlling their flow on the substrate will prevent the use of printing in applications where high switching speeds require submicrometer features. It will also decide whether additive printing will become an important tool for bottom±up nanotechnology, e.g., interfacing with functional nanostructures self-assembled in the liquid phase from smaller building blocks. In principle, printing fulfils many of the material-compatibility requirements for liquid-based self-assembly, but for many systems a key requirement is a patterning resolution of less than 100 nm in order to match the length scale over which supramolecular structure formation can be controlled with high precision. [5,6] Here we demonstrate a novel bottom±up, self-aligned inkjet printing technique that is capable of defining sub-100 nm critical features with two simple additive printing steps using standard inkjet-printing equipment without the need for any lithography or precise relative alignment. The method comprises the steps of a) inkjet printing a first conductive pattern onto the substrate; b) selectively modifying the surface of the first conductive pattern to be of low surface energy without modifying the surface of the substrate; and c) inkjet printing a second conductive pattern that partially overlaps the first conductive pattern, but does not require precise relative alignment. The droplets of the second pattern are repelled by and flow off the low-energy surface of the first pattern and dr...

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Solution‐Processed Organic n‐Type Thin‐Film Transistors

et al. 2003

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ExperimentalThe overall process of the combi-chem system adopted in the present investigation is described in more detail in our previous reports [11±17]. The Eu, Si, and Ca solutions were prepared by dissolving Eu 2 O 3 (0.1 mol), Si(C 2 H 5 O) 4 -(TEOS) (0.5 mol), and CaCO 3 (0.5 mol) in nitric acid. The Mg, Sr, Ba, and B solutions were prepared by dissolving Mg(NO 3 ) 2´6 H 2 O (0.5 mol), Sr(NO 3 ) 2 (0.5 mol), Ba(NO 3 ) 2 (0.25 mol), and H 3 BO 3 (0.5 mol) in deionized water. The appropriate amount of each solution was then injected into a 6 mL test tube array according to the composition table with the assistance of a computer programmed injection system (108 different compositions per generation were used). The solutions in the tubes were dried at 80 C for 24 h. At this stage gelation took place for those compositions that contained more than 0.3 mol of Si, but the others were simply dried. These samples were further dried at 600 C for 2 h. The dried samples were pulverized and collected in a specially designed ceramic container (given the name ªcombi-chemº container) and successively fired at 900 C for 2 h in an ambient atmosphere. The firing temperature was selected out of several other temperatures such as 900, 1000, 1100, and 1200 C in view of the average and maximum luminance value of the first generation. Some of the samples chosen among the library were removed from the combichem containers and examined by XRD and scanning electron microscopy (SEM) analyses. The emission spectra and the decay curves were monitored at 400 nm, which simulates an InGaN LED light source, with the samples being left in the combi-chem containers using a plate reader accessory attached to a Perkin Elmer LS50B spectrometer with a xenon flash lamp. The luminance was calculated by integrating the product of the emission spectrum and the standard visual spectral efficiency curve based on CIE (Commission Internationale de l'Eclairage) regulation [25].

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An Approach towards the Printing of Polymer Circuits

Cited by 4 publications

References 10 publications

Fabrication of Magnetic Carbon Nanotubes Using a Metal‐Impregnated Polymer Precursor

Fabrication of Magnetic Carbon Nanotubes Using a Metal‐Impregnated Polymer Precursor

Lithography‐Free, Self‐Aligned Inkjet Printing with Sub‐Hundred‐Nanometer Resolution

Solution‐Processed Organic n‐Type Thin‐Film Transistors

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