Advanced Technology Institute, University of Surrey, Guildford, Surrey GU2 7XH, UK.
Nanoscale. 2014 Jan 21;6(2):946-52. doi: 10.1039/c3nr05504c.
Transparent and electrically conductive metal nanowire networks are possible replacements for costly indium tin oxide (ITO) films in many optoelectronic devices. ITO films are regularly patterned using pulsed lasers so similar technologies could be used for nanowire coatings to define electrode structures. Here, the effects of laser irradiation on conducting silver nanowire coatings are simulated and then investigated experimentally for networks formed by spray deposition onto transparent substrates. The ablation threshold fluence is found experimentally for such nanowire networks and is then related to film thickness. An effective model using finite-element heat transfer analysis is examined to look at energy dissipation through these nanowire networks and used to understand mechanisms at play in the laser-material interactions. It is demonstrated that the three-dimensional nature of these coatings and the relative ratios of the rates of lateral to vertical heat diffusion are important controlling parameter affecting the ablation threshold.
透明导电金属纳米线网络可能替代昂贵的铟锡氧化物 (ITO) 薄膜，应用于许多光电设备中。ITO 薄膜通常采用脉冲激光进行图案化处理，因此类似的技术也可以用于纳米线涂层，以定义电极结构。在这里，模拟了激光辐照对导电银纳米线涂层的影响，然后针对通过喷涂沉积在透明衬底上形成的网络进行了实验研究。实验确定了这种纳米线网络的烧蚀阈值能流密度，并将其与薄膜厚度联系起来。还使用有限元热传递分析的有效模型来研究通过这些纳米线网络的能量耗散，并用于理解激光与材料相互作用中的作用机制。结果表明，这些涂层的三维性质以及侧向和竖向热扩散速率的相对比值是影响烧蚀阈值的重要控制参数。
