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Printing Process (printing + process)

Distribution by Scientific Domains

Polymers and Materials Science	60%

Selected Abstracts

Inkjet-Printed Single-Droplet Organic Transistors Based on Semiconductor Nanowires Embedded in Insulating Polymers

ADVANCED FUNCTIONAL MATERIALS, Issue 19 2010
Jung Ah Lim
Fabrication of organic field-effect transistors (OFETs) using a high-throughput printing process has garnered tremendous interest for realizing low-cost and large-area flexible electronic devices. Printing of organic semiconductors for active layer of transistor is one of the most critical steps for achieving this goal. The charge carrier transport behavior in this layer, dictated by the crystalline microstructure and molecular orientations of the organic semiconductor, determines the transistor performance. Here, it is demonstrated that an inkjet-printed single-droplet of a semiconducting/insulating polymer blend holds substantial promise as a means for implementing direct-write fabrication of organic transistors. Control of the solubility of the semiconducting component in a blend solution can yield an inkjet-printed single-droplet blend film characterized by a semiconductor nanowire network embedded in an insulating polymer matrix. The inkjet-printed blend films having this unique structure provide effective pathways for charge carrier transport through semiconductor nanowires, as well as significantly improve the on-off current ratio and the environmental stability of the printed transistors. [source]

Inkjet Printing: Inkjet Printing,Process and Its Applications (Adv. Mater.

ADVANCED MATERIALS, Issue 6 2010
6/2010)
Ghassan E. Jabbour and co-workers highlight recent developments in inkjet printing technology and applications on p. 673. The inside cover image shows starting materials (upper left), the inkjet printing process (center), and two examples of applications: QVGA quantum-dot LEDs (bottom left) and macromolecular OLEDs (bottom right). [source]

Soft Transfer Printing of Chemically Converted Graphene

ADVANCED MATERIALS, Issue 20 2009
Matthew J. Allen
A transfer printing process that allows precise patterning of chemically converted graphene is reported. The use of a polydimethylsiloxane (PDMS) stamp and surface energy manipulation resulted in successfully transferring spin-coated materials from one substrate to another. The method is capable of transferring sharp features to precise locations. This represents large-scale, high-throughput transfer printing of chemically converted graphene and paves the way for future complementary circuit design. [source]

Microscopic studies of the influence of main exposure time on parameters of flexographic printing plate produced by digital thermal method

MICROSCOPY RESEARCH AND TECHNIQUE, Issue 10 2009
Liliya Harri
Abstract The digital thermal technology of producing flexographic printing plates from photopolymer plates is one of the newest technologies. This technology allows to develop flexographic plates without the use of any solvent. The process of producing flexographic printing plates by the digital thermal method consists of several main stages: back exposure, laser exposure, main exposure, thermal development, post exposure, and light finishing. The studies carried out with the use of optical stereoscopic microscopy allowed to determine the effect of time of main exposure to ultraviolet radiation on the dot area, diameter, and edge factor of halftone dots reproduced on flexographic printing plate produced by the digital thermal method, as well as on the quality of reproducing the surface and on the profiles of free-standing printing microelements. The results of the microscopic studies performed have allowed to define the criteria of establishing optimum time of main exposure of photopolymer plates used in the digital thermal technology of producing flexographic printing plates. A precise definition of the criteria for determining the optimum time of main exposure will enable to reduce the time-consuming control tests and to eliminate errors in both the process of manufacturing flexographic printing plates and in the printing process carried out with the use of such plates. Microsc. Res. Tech., 2009. © 2009 Wiley-Liss, Inc. [source]

Printing of protein microarrays via a capillary-free fluid jetting mechanism

PROTEINS: STRUCTURE, FUNCTION AND BIOINFORMATICS, Issue 16 2005
J. A. Barron
Abstract Current proteomics experiments rely upon printing techniques such as ink jet, pin, or quill arrayers that were developed for the creation of cDNA microarrays. These techniques often do not meet the requirements needed for successful spotting of proteins to perform high-throughput, array-based proteomic profiling. Biological laser printing (BioLP) is a spotting technology that does not rely on solid pins, quill pins, or capillary-based fluidics. The non-contact mechanism of BioLP utilizes a focused laser pulse to transfer protein solutions, thereby eliminating the potential for orifice clogging, air bubbles, and unnecessary volume loss potentially encountered in commercially available spotting technologies. The speed and spot-to-spot reproducibility of BioLP is comparable to other techniques, while the minimum spot diameter and volume per printed droplet is significantly less at 30,µm and ,500,fL, respectively. The transfer of fluid by BioLP occurs through a fluid jetting mechanism, as observed by high-speed images of the printing process. Arraying a solution of BSA with subsequent immunodetection demonstrates the reproducible spotting of protein in an array format with CVs of <3%. Printing of the enzyme alkaline phosphatase followed by a positive reaction with a colorimetric substrate demonstrates that functional protein can be spotted using this laser-based printer. [source]