Graduate School of Nanoscience and Technology and KINC, KAIST , Daejeon 34141, Republic of Korea.
Department of Material science and Engineering, University of Pennsylvania , Towne Building, 220 South 33rd Street, Philadelphia 19104, United States.
ACS Appl Mater Interfaces. 2017 Mar 1;9(8):7787-7792. doi: 10.1021/acsami.6b15343. Epub 2017 Feb 16.
Manipulation of nanomaterials such as nanoparticles (NPs) and nanorods (NRs) to make clusters is of significant interest in material science and nanotechnology due to the unusual collective opto-electric properties in such structures that cannot be found in the individual NPs. This work demonstrates an effective way to arrange NP clusters (NPCs) to make the desired arrays based on removable and NP-guidable liquid crystalline template using sublimation and reconstruction phenomenon. The position of the NPCs is precisely controlled by the defect structure of the liquid crystal (LC), namely toric focal conic domains (TFCDs), during thermal annealing to construct the LC and corresponding NPC structures. As a proof of concept, the surface-enhanced Raman scattering (SERS) activity of a fabricated array of gold nanorod (GNR) clusters is measured and shown to have highly sensitive detection characteristics essential for potential sensing applications.
由于此类结构中的集体光电特性在单个 NPs 中无法找到，因此操纵纳米材料（如纳米粒子（NPs）和纳米棒（NRs））形成团簇在材料科学和纳米技术中具有重要意义。这项工作展示了一种有效的方法，通过使用升华和重构现象，基于可去除和 NP 导向的液晶模板来排列 NP 团簇（NPCs）以形成所需的阵列。在热退火过程中，通过液晶（LC）的缺陷结构（即托力克焦锥畴（TFCDs））精确控制 NPCs 的位置，以构建 LC 和相应的 NPC 结构。作为概念验证，测量了所制造的金纳米棒（GNR）团簇阵列的表面增强拉曼散射（SERS）活性，并表明其具有用于潜在传感应用的高灵敏度检测特性。
