Zhang Tongtong, Sun Fuqiang, Wang Yaorong, Li Yingchi, Wang Jing, Wang Zhongqiang, Li Kwai Hei, Zhu Ye, Wang Qi, Shao Lei, Wong Ngai, Lei Dangyuan, Lin Yuan, Chu Zhiqin
Department of Electrical and Electronic Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong 999077, China.
Advanced Biomedical Instrumentation Centre, Hong Kong Science Park, Shatin, New Territories, Hong Kong 999077, China.
ACS Nano. 2024 Dec 31;18(52):35405-35417. doi: 10.1021/acsnano.4c12436. Epub 2024 Dec 19.
Diamond particles have many interesting properties and possible applications. However, producing diamond particles with well-defined shapes on a large scale is challenging because diamonds are chemically inert and extremely hard. Here, we show that air oxidation, a routine method for purifying diamonds, can be used to precisely shape diamond particles at scale. By exploiting the distinct reactivities of different crystal facets and defects inside the diamond, layer-by-layer outward-to-inward and inward-to-outward oxidation produced diverse diamond shapes including spheres, twisted surfaces, pyramidal islands, inverted pyramids, nanoflowers, and porous polygons. The nanosculpted diamonds had more and finer features that enabled them to outperform the original raw diamonds in various applications. Using experimental observations and Monte Carlo simulations, we built a shape library that guides the design and fabrication of diamond particles with well-defined features that could be critical for anticounterfeiting, optical, and other practical applications. Our study presents a simple, economical, and scalable way to produce shape-customized diamonds for various potential technologies.
金刚石颗粒具有许多有趣的特性和潜在应用。然而，大规模生产形状明确的金刚石颗粒具有挑战性，因为金刚石化学性质惰性且极其坚硬。在此，我们表明，空气氧化这种提纯金刚石的常规方法可用于大规模精确塑造金刚石颗粒形状。通过利用金刚石内部不同晶面和缺陷的不同反应活性，逐层从外向内和从内向外氧化产生了多种金刚石形状，包括球体、扭曲表面、金字塔形岛、倒金字塔、纳米花和多孔多边形。纳米雕刻的金刚石具有更多且更精细的特征，使其在各种应用中优于原始的粗金刚石。通过实验观察和蒙特卡罗模拟，我们建立了一个形状库，可指导设计和制造具有明确特征的金刚石颗粒，这些特征对于防伪、光学及其他实际应用可能至关重要。我们的研究提出了一种简单、经济且可扩展的方法，可为各种潜在技术生产形状定制的金刚石。
