Scientific research

The 2D materials research group of 11D Technology Co., Ltd. was established in July 2018 and was born almost at the same time as 11D Technology Co., Ltd. As the research pillar of the 11D scientific research center, the members of the 2D group team are committed to scientific research. Passionate, within a year, from the initial three-person team to today's 5 incumbents, 5 joint training students, 4 overseas students team. Under the leadership of the team leader Dr. Junzhu Li, the team has published a large number of scientific research papers in internationally renowned journals and more than ten domestic invention patents in the past year. The team currently has two complete chemical vapor deposition systems (CVD) as material preparation equipment and a large number of material characterization methods such as scanning electron microscope (SEM), atomic force microscope (AFM), and Raman. Now, the two-dimensional materials group of 11-dimensional Technology Co., Ltd. is in a stage of rapid development and is a research group full of vigor and vitality.

The researchers of the research team actively pay attention to the most cutting-edge technology progress of two-dimensional materials at home and abroad, and follow closely the materials preparation and physics research steps in the advanced fields of scientific research. The specific scientific research mainly includes the following.

  • Graphene
  • Transition metal disulfide/TMDs
  • Hexagonal Boron Nitride/h-BN
  • Quantum Dots

Graphene

Graphene is a monolayer composed of sp2 hybrid-bonded carbon atoms. Single-layer graphene is also the only real "two-dimensional material" in the scientific research community today, due to its unique energy band structure and theoretical properties. It has received extensive attention from scientific research and industry circles. Because of its perfect hexagonal lattice structure, graphene is connected to other carbon atoms to form a hexagonal ring structure, and the pz orbitals perpendicular to the layer of each carbon atom can be formed through The large multi-atom π bond (similar to benzene ring) in the whole layer, because it has extremely superior carrier mobility and optical properties.

For the preparation of graphene, the 2D research team has mastered the highest-quality and controllable CVD synthesis method in the scientific research community, as well as the "top-down" preparation method of the liquid phase exfoliation method. It can accurately prepare many samples such as single-layer graphene, multi-layer graphene, single-crystal graphene, graphene oxide-free nanosheets, and large single-crystal graphene visible to the naked eye. The sample morphology has a high degree of hexagonal symmetry and the quality is almost perfect, which is very suitable for high-end scientific research work and new era industrial fields.

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Transition metal disulfide/TMDs

In recent years, transition metal disulfides (TMDs) represented by molybdenum disulfide (MoS2) have received extensive attention from scientific and industrial circles due to their potential in many new applications and basic research. Band gap and carrier mobility can be adjusted by the number of layers, the resistance of the material changes with the intensity of incident light, and a single layer of molybdenum disulfide exhibits a current carrying current of 500 cm2·V-1·s-1 at room temperature Direct band gap semiconductor with sub-mobility.

For the preparation of transition metal disulfides (TMDs) represented by molybdenum disulfide (MoS2), the 2D research team has mastered the most controllable CVD method that allows large-area synthesis in the scientific research community, and liquid phase stripping. This kind of "top-down" preparation method. It can accurately prepare many samples of single-layer TMDs, single-crystal TMDs and TMDs nanosheets with different substrates. The sample morphology is highly flat, symmetrical, and the quality is almost perfect, which is very suitable for high-end scientific research work and the new era of industry.

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Hexagonal Boron Nitride/h-BN

{% trans 'Hexagonal boron nitride (h-BN) is a III-V compound with a structure similar to graphite and is called "white graphite". It is a layered structural material, and the van der Waals interaction between the layers is weak. In each layer, its honeycomb structure consists of alternating boron and nitrogen atoms, just like graphene. h-BN is a direct band gap semiconductor material (5.97 ev), its in-plane mechanical strength and thermal conductivity are close to graphene, and the chemical properties of h-BN are even higher than graphene; it can be used in air up to 1000°C Remain stable. h-BN has a wide range of applications due to its excellent properties, such as deep ultraviolet emitters, transparent films, dielectric layers or protective coatings.'

The two-dimensional research team of 11-dimensional nanomaterials has conducted sufficient experimental and theoretical research on h-BN, and published corresponding papers in domestic and foreign journals. For the preparation of materials, the research team used copper foil as the substrate of h-BN (its (110) crystal plane is very conducive to the growth of h-BN), and chemical vapor deposition can be used to prepare single crystal h-BN and full The single-layer h-BN film has superior morphology and quality, and can be further used as a raw material for scientific research and industrial applications.

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