Engineering on-chip nanoporous gold material libraries via precision photothermal treatment.
Engineering on-chip nanoporous gold material libraries via precision photothermal treatment.
复制标题
DOI：
10.1039/c5nr04580k
复制
发表时间：
2016-01-14
期刊：
影响因子：
6.7
通讯作者：
Matthews MJ
中科院分区：
文献类型：
--
作者：
Chapman CA;Wang L;Biener J;Seker E;Biener MM;Matthews MJ
单芯片纳米结构材料库是物理和生物学领域高通量和结构-性质关系组合研究的一个有前途的平台。纳米孔金（np-Au）是一种由合金腐蚀过程产生的纳米结构材料，由于其自相似的热诱导粗化行为，特别适合于此类研究。然而，传统的热应用技术用于修饰np-Au是块体工艺，不能用于在单个芯片上生成不同孔径的库。在这里，激光微加工通过提供一种具有高空间和时间分辨率的应用能量的方法，为这个问题提供了一个有吸引力的解决方案。在本研究中，我们使用有限元多物理场模拟来预测在光热退火过程中，激光模式（连续波与脉冲）和支撑衬底的热导率对局部np-Au膜温度的影响。基于这些结果，我们讨论了np-Au网络粗化的机理。热输运模拟预测，连续波模式激光照射在硅衬底上的np-Au薄膜支持通过np-Au的光热退火可以产生的最广泛的形貌。利用模拟提供的指导，我们成功地制造了一个由9种不同形态的81个np-Au样品组成的片上材料库，用于结构-性能关系的并行研究。
Libraries of nanostructured materials on a single chip are a promising platform for high throughput and combinatorial studies of structure-property relationships in the fields of physics and biology. Nanoporous gold (np-Au), produced by an alloy corrosion process, is a nanostructured material specifically suited for such studies because of its self-similar thermally induced coarsening behavior. However, traditional heat application techniques for the modification of np-Au are bulk processes cannot be used to generate a library of different pore sizes on a single chip. Here, laser micro-processing offers an attractive solution to this problem by providing a means to apply energy with high spatial and temporal resolution. In the present study we use finite element multiphysics simulations to predict the effects of laser mode (continuous-wave vs. pulsed) and thermal conductivity of the supporting substrate on the local np-Au film temperatures during photothermal annealing. Based on these results we discuss the mechanisms by which the np-Au network is coarsened. Thermal transport simulations predict that continuous-wave mode laser irradiation of np-Au thin films on a silicon substrate supports the widest range of morphologies that can be created through the photothermal annealing of np-Au. Using the guidance provided by simulations, we successfully fabricate an on-chip material library consisting of 81 np-Au samples of 9 different morphologies for use in the parallel study of structure-property relationships.