According to a recent report from the US "Daily Science" website, two-dimensional materials composed of Group 14 elements (graphene's "cousins") have attracted great attention in recent years because of their potential to become topological insulators. Recently, Japanese scientists have made purely theoretical lead-based two-dimensional honeycomb material plumbene (plumbene) a reality.
The reason why leadene attracts attention is that the electronic orbital structure of lead and the resulting maximum energy band gap make it have the largest spin-orbit interaction, which may make it a strong and durable two-dimensional topological insulator. In this type of insulator, the quantum spin Hall effect may even occur in an environment above room temperature. Therefore, finding a reliable and low-cost method to synthesize leadene has been an important goal of materials science research.
In the latest study, a research team led by Nagoya University annealed an ultra-thin lead film on palladium to produce leadene. The resulting planar material has a two-dimensional monolayer signature honeycomb structure.
To their surprise, a palladium-lead alloy film with a bubble structure was formed under the lead, similar to the "Will-Ferron" structure (it divides the space into units of equal volume and allows the contact surface between them The sum of the surface areas is the smallest). In 2008, the design inspiration for the "Water Cube" of the National Swimming Center of the Beijing Olympic Games venues was derived from the "Will-Ferron" structure.
The leader of the research team, Yuji Haru, said that the "Water Cube" and "Will-Ferron" structures in Beijing are not the first examples of mutual inspiration between architects and materials scientists. He said: "In 1967, architect Buckminster Fuller designed the geodesic sphere for the Montreal World Expo, and later carbon 60 was named 'Buckminster Fullerene' under his name. We can It is expected that venues such as the 2020 Tokyo Olympics, the 2024 Paris Olympics, the 2020 Dubai Expo, the 2023 Buenos Aires Expo, and the 2025 Osaka Expo will all be able to express new materials in the future and attract attention. (Reporter Liu Xia)
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