tailieunhanh - Radio Frequency Identification Fundamentals and Applications, Design Methods and Solutions Part 12

Tham khảo tài liệu 'radio frequency identification fundamentals and applications, design methods and solutions part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 266 Radio Frequency Identification Fundamentals and Applications Design Methods and Solutions Although metals like copper Hong Wagner 2000 and gold Molesa et al. 2003 have been used for inkjet printing applications direct inkjet printing of conductive silver tracks onto flexible substrates has gained interest due to silver having the lowest resistivity value and the relatively simple synthesis of silver nanoparticles Schmid 2004 . Therefore it has been used for many applications such as interconnections for a circuitry on a printed circuit board Szczech et al. 2002 disposable displays and radio frequency identification RFID tags Huang et al. 2004 Potyrailo et al. 2009 organic thin-film transistors Kim et al. 2007 Gamerith et al. 2007 and electrochromic devices Shim et al. 2008 . This chapter will describe how inkjet printing techniques can be used for the fabrication of conductive tracks on a polymer substrate. The selective sintering of inkjet printed silver nanoparticles is described by using microwave radiation. This not only sinters the particles into a conductive feature but it also reduces the sintering time significantly from hours to minutes or even seconds. Furthermore techniques to improve the printing resolution will be discussed and the fabrication of conductive tracks of 40 pm wide will described. Before going in detail on inkjet printing of advanced nanoparticle inks we first review the history of inkjet printing. 2. Historical overview of inkjet printing The origin of inkjet printing goes back to the eighteenth century when Jean-Antoine Nollet published his experiments on the effect of static electricity on a stream of droplets in 1749 Nollet Watson 1749 . Almost a century later in 1833 Felix Savart discovered the basics for the technique used in modern inkjet printers an acoustic energy can break up a laminar flow-jet into a train of droplets Savart 1833 . It was however only in 1858 that the first practical inkjet device was invented by William .