Printed Circuit Design & Fab - September 2008 - (Page 38)

nanotEch A B C D E F G H I J K L 500 !m FiGurE 2. Various printing process (A) Screen Print with printed area (6 inchX12 inch), (B)-(F) enlarged screen print, (G)-(H) Ink-jet print, (I) micro contact Printing, and (J) Dispensing. Figure 2. Various printing process (A) Screen Print with printed area (6 inchX12 inch), (B)-(F) enlarged screen print, (G)-(H) Ink-jet print, with particle size ranging and 10 have advantages in terms of manuloss dielectrics), embedded passives (I) micro contact Printing, from (J) Dispensing. (capacitors, resistors) and circuits can be seen in FiGurE 1. In addition, printable optically/magnetically active nanocomposites and polymeric materials are being investigated for use in the fabrication of devices such as inductors, embedded lasers and optical interconnects. Here we have used epoxies as the typical polymer matrix and a range of metal/ceramic fillers nm to 10 microns. The addition of different fillers into the epoxy matrix controls the overall electrical properties of the composites. For example, the addition of zinc oxide nanoparticles into the epoxy shows laser-like behavior upon optical pumping. The addition of barium titanate (BaTiO3) nanoparticles results in high capacitance. Thermosetting resins in general facturability, processing temperatures, low moisture absorption, high glass transition temperatures (Tg) and versatility, making them quite promising for advanced packaging. However, homogeneous dispersions of ceramic particles in the epoxy matrix are a critical step to achieve uniform property films. Printable nanocomposites have potential applications at all levels of microelectronics (see Figure 1). Printing processes have several advantages such as selective deposition, repair and re-print capability. However, printed features with desired properties, thickness and tolerance present significant challenges. In general, nanocomposite solutions are used for thin ink-jet printing, and pastes are used for thick screen and contact printing. Nanocomposite concentration and corresponding viscosity is important for the printing process. Ink-jet printing prefers low viscosity in the range of 7 cp to 10 SEPTEMBER 2008 38 printEd CirCuit dESign & fAB http://www.pcb-pool.com/ppus/info.html?PHPSESSID=7df48fa7c977776045ff8d4b24a70fc7 http://www.free-pcb-software.com http://www.pcb-pool.com/ppus/info.html?PHPSESSID=7df48fa7c977776045ff8d4b24a70fc7

Table of Contents Feed for the Digital Edition of Printed Circuit Design & Fab - September 2008

Printed Circuit Design & Fab - August 2008 Contents Our Line Market Watch Around the World Happenings ROI Positive Plating Off the Shelf Marketplace Ad Index EMC for the Real World Final Finish Forum Design for Green: Laminates A Systematic Approach to Increasing Layer Count The NTI $100 Million Club Printable Nanocomposites BGA Bulletin

Printed Circuit Design & Fab - September 2008

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