Approximately 5600 layered compounds have been found, of which more than 1800 are easily or possibly exfoliated, as the number of two-dimensional (2D) materials continues to expand. Alfa Chemistry creates high-quality bespoke heterostructures using CVD-grown 2D materials. To customize heterojunctions with different materials and layers of different materials, we can stack any of our company's CVD materials on top of each other. We are dedicated to provide our consumers with innovative CVD products at a competitive price.
Customization Capability
Alfa Chemistry has developed scalable methods for transferring 2D CVD-grown flakes back-to-back to construct 2D vertical heterojunctions, demonstrating our capabilities in a variety of substrate and heterojunction arrangements.
- Stack two or more CVD-grown 2D material flakes on top of each other, or stack many layers.
- CVD produced 2D flakes are hand stacked upon other specially selected 2D materials. Customers must either furnish their own 2D material or find a suitable provider.
- CVD-grown 2D sheets can be grown directly onto other 2D materials, such as our other products or 2D materials chosen by the customer.
Fig 1. AFM characterization of the 2D heterostructure consisting of a CVD-grown, wet-transferred graphene on an h-BN flake supported by SiO2. (Chou H, et al. 2015)
Despite the fact that our R&D team uses a chemical-free transfer procedure, transfer-related changes in the physical properties of the 2D layer, such as strain, substrate, and defects, are expected to occur. Other 2D materials, polymers, glass, TEM grids, metals, plasma structures, SiO2/Si, sapphire, diamond, and other substrate CVD monolayers have all been transferred so far. The cost of your sample is mostly determined by the substrate type, CVD monolayer, and other technical issues unique to your application and sample specifications. All transferred CVDs are final and non-refundable due to the unique nature of the production process.
Why Choose Us?
1. Technical assurance: a top technical engineer team with over 5 years of experience in similar work.
2. Preparation requirements: faultless and advanced experimental equipment, complete 2D materials (excluding special materials), and customers only need to provide device structure drawings.
3. Surface cleanliness of the substance: the material surface is atomic level clean.
4. Assured satisfaction: The quality of the heterogeneous structure is guaranteed.
5. Preparation lead time: Depending on the difficulty of stripping 2D materials, the lead time may vary slightly. This will be determined by your project, the intended chemical composition, and sample production needs. In most cases, it takes 1-3 weeks.
Examples of Customization
Making a cloud pattern sample
Although this is theoretically conceivable, small-angle stacking is generally difficult and time-intensive. Transferring a triangular CVD monolayer to another CVD triangular sample is recommended. The sample will comprise multiple vertical heterojunctions with varied angular layouts since each material has triangles oriented in different orientations.
CVD Film Transfer to TEM Grids
Any CVD monolayer product can be transferred to any TEM grid. You must choose your own TEM grid, offer the model number, and provide extra TEM grids for testing.
Control of 2D Heterogeneous Structure Interfaces
Surfaces and interfaces in 2D materials play a key role in the resulting properties. Methods for controlling surfaces and interfaces have the potential to tailor properties for a range of applications. Learn more about our experimental strategy for preserving and customizing 2D heterostructure interfaces below.
Reference
- Chou H, et al. (2015). "Revealing The Planar Chemistry of Two-Dimensional Heterostructures at The Atomic Level." Nature Communications. 6: 7482.
Please kindly note that our products are for research use only.
