Laser printing

Just as the growth of xerographic copying and laser-printing, which derives from xerography, was a physicists triumph, the development of fax machines was driven by chemistry, in the development of modern heat-sensitive papers most of which have been perfected in Japan. 

Electrophotography is the correct technical name for the non-impact electrostatic printing processes, which include photocopying, also commonly called xerography because of the company that developed the original systems (Xerox), and laser printing. ... 

Develop. The latent image is rendered visible by the attachment of oppositely charged toner particles to the drum or belt positive in the photocopying process and negative in laser printing... 

Figure 2.37 The electrophotographic process using organic photoconductors (a) photocopying and (b) laser printing.

This topic is covered in detail in Section 5.6, but a brief mention of ink-jet printing is warranted in order to compare and contrast the colorants and technology to laser printing and thermal printing. 

Lago, C.L., da Silva, T.H.D., Neves, C.A., Alves Brito-Neto, A.J.G., Fracassi da Silva, J.A., A dry process for production of microfluidic devices based on the lamination of laser-printed polyester films. Anal. Chem. 2003, 75, 3853-3858. 

The panel was produced as follows (Fig. 10.5). A donor film with the structure previously described and coated with a 1-pm DNNSA-PANI/SWNT composite [15] was used to print all conducting circuit elements. First, the large donor film was held by vacuum on the flexible receiver. The gate layer was then printed by selectively exposing the DNNSA-PANI/SWNT donor film as previously described. When exposure was complete the receiver was removed and a l-pm dielectric layer was applied over the whole area. The receiver is then repositioned on to the drum in registry for laser printing of the source/drains and interconnects. The widths of... 

In the academic setting, inkjet resolution reported for printed organic electronic materials is approximately 20-25 Lxm for untreated substrates and 5 p,m for thermal laser printing. For conductive metallic features, features of 10 Lxm or less have been reported for untreated surfaces. These limits can be further reduced by pretreating the substrate, for example by creating hydrophobic/ hydrophilic dewetting patterns. 

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