Moon Yoon Jae, Kang Heuiseok, Kang Kyungtae, Hwang Jun Young, Lee Jae-Heon, Moon Seung-Jae
J Nanosci Nanotechnol. 2014 Nov;14(11):8631-5. doi: 10.1166/jnn.2014.9965.
The variation in electric conductivity was examined for laser irradiation with various beam intensities. A 532-nm continuous wave laser was irradiated onto inkjet-printed silver lines on a glass substrate and the electrical resistance was measured in situ during the irradiation. The results demonstrate that electrical conductivity varies nonlinearly with laser intensity, and has a minimum specific resistance of 3.1 x 10(-8) Ωm at 4 kW/cm2 irradiation. These results are interesting because the specific resistance achieved by the present laser irradiation was approximately 1.9 times lower than the best value obtainable by oven heating, even though it was still higher by 1.9 times than that of bulk silver. It is also demonstrated that the irradiation time required to complete the sintering process decreases with laser intensity. The numerical simulation of laser heating shows that the heating temperature could be as high as 250 degrees C for laser sintering, while it is limited to 250 degrees C for oven sintering. The characteristics of sintering with laser intensity based on the results of field emission scanning electron microscope images are discussed.
研究了不同光束强度的激光辐照下的电导率变化。将一台532纳米连续波激光照射到玻璃基板上喷墨打印的银线上，并在辐照过程中现场测量电阻。结果表明，电导率随激光强度呈非线性变化，在4千瓦/平方厘米的辐照下，最低电阻率为3.1×10（-8）Ωm。这些结果很有趣，因为尽管通过本激光辐照获得的电阻率仍比块状银高1.9倍，但它比通过烘箱加热可获得的最佳值低约1.9倍。还表明，完成烧结过程所需的辐照时间随激光强度而减少。激光加热的数值模拟表明，激光烧结的加热温度可高达250摄氏度，而烘箱烧结的加热温度限制在250摄氏度。基于场发射扫描电子显微镜图像的结果，讨论了激光强度烧结的特性。
