Chang Shery L Y, Dwyer Christian, Ōsawa Eiji, Barnard Amanda S
John M. Cowley Center for High Resolution Electron Microscopy, Arizona State University, Tempe, USA.
Nanoscale Horiz. 2018 Mar 1;3(2):213-217. doi: 10.1039/c7nh00125h. Epub 2018 Jan 8.
Nanometer-sized diamond particles are used in bio-medical applications, where the nature of the nanodiamond surfaces is crucial to achieving correct functionalisation. Herein, using high-resolution transmission electron microscopy and electronic structure calculations, we study the surface reconstructions that occur in detonation-synthesized nanodiamonds. Our results show that particles smaller than 3 nm exhibit size- and shape-dependent surface reconstructions, and that the surfaces can exhibit a higher-than-expected fraction of sp bonding. This indicates an aliphatic character for sub-3 nm nanodiamond particles. Such behaviour impacts the functionality of nanodiamonds, where both size and surface charge can drive performance. Our observations offer a potential strategy for better functionalization control via the size range of the particles.
纳米尺寸的金刚石颗粒被用于生物医学应用中，在这些应用里，纳米金刚石表面的性质对于实现正确的功能化至关重要。在此，我们使用高分辨率透射电子显微镜和电子结构计算，研究爆轰合成纳米金刚石中发生的表面重构。我们的结果表明，小于3纳米的颗粒表现出与尺寸和形状相关的表面重构，并且这些表面可能呈现出高于预期比例的sp键合。这表明亚3纳米纳米金刚石颗粒具有脂肪族特性。这种行为会影响纳米金刚石的功能，其中尺寸和表面电荷都可以驱动其性能。我们的观察结果为通过颗粒尺寸范围更好地控制功能化提供了一种潜在策略。
