State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.
Small. 2019 May;15(18):e1805308. doi: 10.1002/smll.201805308. Epub 2019 Apr 2.
Assembling nanosized building blocks into macroscopic 3D complex structures is challenging. Here, nanosized metal and semiconductor building blocks with a variety of sizes and shapes (spheres, stars, and rods) are successfully assembled into a broad range of hierarchical (nanometer to micrometer) assemblies of functional materials in centimeter size using butterfly wings as templates. This is achieved by the introduction of steric hindrance to the assembly process, which compensates for attraction from the environmentally sensitive hydrogen bonds and prevents the aggregation of nanosized building blocks. Of these materials, Au nanostar assemblies show a superior enhancement in surface-enhanced Raman scattering (SERS) performance (rhodamine 6G, 1506 cm ) under 532, 633, and 780 nm excitation-this is 3.1-4.4, 3.6-3.9, and 2.9-47.3 folds surpassing Au nanosphere assemblies and commercial SERS substrates (Q-SERS), respectively. This method provides a versatile route for the assembly of various nanosized building blocks into different 3D superstructures and for the construction of hybrid nanomaterials and nanocomposites.
将纳米级的结构单元组装成宏观的 3D 复杂结构具有挑战性。在这里，通过引入空间位阻到组装过程中，成功地将具有各种尺寸和形状（球体、星型和棒状）的纳米级金属和半导体结构单元组装成厘米尺寸的具有广泛的分级（纳米到微米）的功能性材料的组装体，蝴蝶翅膀作为模板。这补偿了来自环境敏感的氢键的吸引力，防止了纳米级结构单元的聚集。在这些材料中，金纳米星组装体在表面增强拉曼散射（SERS）性能（罗丹明 6G，1506 cm ）下表现出优越的增强-在 532、633 和 780nm 激发下，分别是金纳米球组装体和商业 SERS 基底（Q-SERS）的 3.1-4.4、3.6-3.9 和 2.9-47.3 倍。该方法为将各种纳米级结构单元组装成不同的 3D 超结构以及构建混合纳米材料和纳米复合材料提供了一种通用的途径。
