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báo cáo hóa học:" Microstructure and adhesion characteristics of a silver nanopaste screen-printed on Si substrate"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Microstructure and adhesion characteristics of a silver nanopaste screen-printed on Si substrate | Kim et al. Nanoscale Research Letters 2012 7 49 http www.nanoscalereslett.eom content 7 1 49 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Microstructure and adhesion characteristics of a silver nanopaste screen-printed on Si substrate Kwang-Seok Kim1 Yongil Kim2 and Seung-Boo Jung2 Abstract The microstructural evolution and the adhesion of an Ag nanopaste screen-printed on a silicon substrate were investigated as a function of sintering temperature. Through the two thermal analysis methods such as differential scanning calorimeter and thermo-gravimetric analysis the sintering conditions were defined where the temperature was raised from 150 C to 300 C all with a fixed sintering time of 30 min. The microstructure and the volume of the printed Ag nanopaste were observed using a field emission scanning electron microscope and a 3D surface profiler respectively. The apparent density of the printed Ag nanopaste was calculated depending on the sintering conditions and the adhesion was evaluated by a scratch test. As the sintering temperature increased from 150 C to 300 C the apparent density and the adhesion increased by 22.7 and 43 respectively. It is confirmed that the printed Ag nanopaste sintered at higher temperatures showed higher apparent density in the microstructural evolution and void aggregation resulting in the lower electrical resistivity and various scratched fractures. Keywords silver nanopaste screen printing sintering density adhesion. Introduction Micro and nanofabrication are essential for the modern electronic devices 1 . Recently printed electronics has been highlighted by many researchers in academia and industry as emerging manufacturing technologies to fabricate portable and display devices 2-6 . The fabrication methods of printed electronics reported so far include direct printing techniques such as inkjet gravure and screen printing 7-9 . These techniques have been put forward as alternative methods for patterning