Small-Angle X-ray Scattering Analysis of Colloidal Crystals and Replica Materials Made from l -Arginine-Stabilized Silica Nanoparticles
Small-Angle X-ray Scattering Analysis of Colloidal Crystals and Replica Materials Made from l -Arginine-Stabilized Silica Nanoparticles
复制标题
L-精氨酸稳定二氧化硅纳米颗粒制成的胶体晶体和复制材料的小角 X 射线散射分析
DOI：
10.1021/acsami.1c19193
复制
发表时间：
2022
影响因子：
9.5
通讯作者：
Mallouk, Thomas E.
中科院分区：
文献类型：
--
作者：
Mahale, Pratibha;Lee, Byeongdu;Cheng, Hiu Yan;Segad, Mo;Mallouk, Thomas E.
由亚100 nm二氧化硅纳米颗粒制成的胶体晶体为模板辅助合成三维互连的半导体、金属和磁性复制品提供了一个通用平台。然而，这些材料的详细结构尚未被表征。在这项研究中，我们研究了胶体晶体薄膜和锗复制品的结构，通过扫描电子显微镜和小角X射线散射。通过蒸发组装得到的胶体晶体的结构取决于精氨酸包覆的二氧化硅纳米颗粒的尺寸。直径小于31nm的颗粒组装成非密堆积排列（bcc），而直径大于31nm的颗粒组装成具有无序六方相的随机密堆积结构。这些材料的多晶膜在高温高压下渗透后保持其结构和长程有序，并且该结构在Ge复制品中得以保留。二氧化硅纳米粒子的沉积和分散过程中的剪切力有助于结构中基于尺寸的变化和胶体晶体膜中晶体域的尺寸。
Colloidal crystals made from sub-100 nm silica nanoparticles have provided a versatile platform for the template-assisted synthesis of three-dimensionally interconnected semiconducting, metallic, and magnetic replicas. However, the detailed structure of these materials has not yet been characterized. In this study, we investigated the structures of colloidal crystalline films and germanium replicas by scanning electron microscopy and small angle X-ray scattering. The structures of colloidal crystals made by evaporative assembly depends on the size ofl-arginine-capped silica nanoparticles. Particles smaller than ∼31 nm diameter assemble into non-close-packed arrangements (bcc) whereas particles larger than 31 nm assemble into random close-packed structures with disordered hexagonal phase. Polycrystalline films of these materials retain their structures and long-range order upon infiltration at high temperature and pressure, and the structure is preserved in Ge replicas. The shear force during deposition and dispersity of silica nanoparticles contributes to the size-based variation in the structure and to the size of crystal domains in the colloidal crystal films.