journal article·2022-11-25

Origins and Simulation of (002) Forbidden Reflections in Nanodiamonds: Implications for Sub-4 nm Nanodiamond Synthesis and Characterization

Shi Su, Yuting Shen, Shu Wan, Hengchang Bi, Shanshan Shen, Xiaolin Sun

ACS Applied Nano Materials· Volume 5· Issue 11
Publisher page

Abstract

So far, although the conception of the so-called “n-diamond” has been established for almost 30 years and widely cited as the critical evidence of Younger Dryas impact hypothesis, its crystallographic structure is still mysterious. Many speculations on the unexplained (002) forbidden reflections have been proposed. However, none of them has any convincible evidence or obeys the carbon orbital hybridization rules. According to the recent observation on sub-4 nm nanodiamond, we concluded that the “n-diamond” was not derived from the Fm3m crystallographic group. The unexplainable (002) forbidden reflection is caused by the spatial resolution limitation of HRTEM equipment and defocus on the target particles. According to the forbidden reflection rules, the defocus will lead to a topological obscure shadow in plane. Finally, experimental evidence of an individual sub-4 nm nanodiamond exhibits an observable transformation from cubic diamond to “n-diamond” with the appearance of (002) reflection, which proves our assumption. This work will contribute to the characterization technique for sub-4 nm nanodiamond synthesis.
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Research context

OpenAlex topics: Diamond and Carbon-based Materials Research · High-pressure geophysics and materials · Geological and Geochemical Analysis

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Aeronautical Engineering, Nanjing Vocational University of Industry Technology, Nanjing210023, P. R. China

SEU-FEI Nano-Pico Center, Key Lab of MEMS of Ministry of Education, Collaborative Innovation Center for Micro/Nano Fabrication, Device and System, Southeast University, Nanjing210096, P. R. China

School of Electronic and Information Engineering, Changshu Institute of Technology, Changshu 215500, China

Key Laboratory of Optoelectronic Technology and Systems, Ministry of Education, Key Disciplines Laboratory of Novel Micro-Nano Devices and System Technology, School of Optoelectronics Engineering, Chongqing University, Chongqing400044, P. R. China

Shanghai Key Laboratory of Multidimensional Information Processing, School of Communication and Electronic Engineering, East China Normal University, Shanghai200241, P. R. China

Funding

Natural Science Foundation of Jiangsu Province · National Natural Science Foundation of China

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