Progress in research on terpenes, a novel 2-D graphene-like crystal material

Progress in research on terpenes, a novel 2-D graphene-like crystal material

(Left) Terpene high-resolution STM image (U = 1 V, I = 0.05 nA), (right) Atom relaxation model for cellular terpene structure on Pt(111) obtained by first-principles calculations, and experimental results Completely consistent.

Recently, the Cao Gengyu Research Group of the Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, and the Gao Hongkai Research Group of the Institute of Physics of the Chinese Academy of Sciences collaborated to make new progress in the preparation of terpenes, a new type of graphene two-dimensional crystal material. Related findings The first writer of the Chinese Academy of Sciences’ physics co-published this article in the magazine of Advanced Materials (2014, 26, 4820).

In recent years, graphene research has engendered a worldwide upsurge. So far, researchers have successively prepared graphene and silicon-based siliconene composed of carbon, and explored the unusual electronic properties of its honeycomb structure. With the continuous deepening of the study of graphene, researchers turned their attention to the elements of the same family as carbon and silicon.

Theoretical studies have demonstrated that a single-layered undulated cellular structure in a free state can be stably present [S. Cahangirov, et al. Phys. Rev. Lett. 102, 236804 (2009)]. This fluctuating germanium honeycomb structure has quantum spins. The nature of the Hall effect [C.-C. Liu, et al. Phys. Rev. Lett. 107, 076802 (2011)], through which high-temperature superconductivity is also predicted [G. Baskaran, arXiv: 1309.2242 (2013)]. The two-dimensional honeycomb material has such important electronic characteristics. However, it has not been reported so far to prepare a two-dimensional honeycomb structure composed of elemental germanium.

Associate Professor Qin Zhihui of Wuhan Institute of Physics and Information Sciences led the doctoral student Lu Shuangzan and the academician of the Institute of Physics of the Chinese Academy of Sciences Gao Hongkai to work together to successfully fabricate a two-dimensional honeycomb structure of germanium on the Pt (111) substrate by finely optimizing epitaxial growth conditions. This verifies the theoretical prediction of the "monolayer undulating ruthenium honeycomb structure can be stable existence". Through in-situ fine characterization of low-energy electron diffraction and scanning tunneling microscopy, it was found that the two-dimensional honeycomb structure of lanthanum forms a (23 ́Ö19) R23° periodic superstructure relative to the Pt(111) substrate, and this superstructure corresponds exactly to The (3 ́3) structure of the terpene crystal lattice.

The researchers combined the first-principles calculations to further validate this superstructure model and revealed the continuity of terpenes by calculation of the electron local function, demonstrating that the Ge atoms in the terpenes are covalently bonded to form an erbium Two-dimensional honeycomb lattice material. Terpene has a stronger spin-orbit coupling energy gap than graphene and siliconene. The graphene-like structure for the preparation of tellurium is extremely important for future electronics, and relevant electronic characterization is under way.

The research work received strong support from the Ministry of Science and Technology's Class A "973" project. At the International Conference on the Latest Progress in Graphene Research held in 2014, Qin Zhihui’s associate researcher presented the results of the research to the General Assembly through the poster titled Graphene-Like Two-demensional Germanene Formation on Pt(111) and obtained the conference. The "Best Poster Award" was selected.

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