There are several two-dimensional (2D) nanomaterials that have been discovered and studied to date. Some of the most well-known include:
Graphene: A single layer of carbon atoms arranged in a hexagonal lattice
Transition metal dichalcogenides (TMDs): 2D materials composed of a transition metal (Mo, W, etc.) and chalcogen (S, Se, Te) atoms
Black phosphorus: A 2D material made of phosphorus atoms arranged in a layered structure
Boron nitride: A 2D material made of boron and nitrogen atoms arranged in a hexagonal lattice
Molybdenum disulfide (MoS2): A 2D material composed of molybdenum and sulfur atoms
Tungsten diselenide (WSe2): A 2D material composed of tungsten and selenium atoms
These are just a few examples, and the list of 2D nanomaterials is constantly growing as new materials are discovered and studied.
As for TiO2, it is not a 2D material. TiO2 is a well-known material with various crystalline phases, including rutile, anatase, and brookite, but it is typically considered a three-dimensional material. However, some researchers have produced ultrathin 2D nanosheets of TiO2 through exfoliation, and these 2D TiO2 nanosheets have been studied for various applications, including energy storage and catalysis.
Two-dimensional (2D) Systems also called *Layered Materials* also called *2D world* 2D materials are classified into 5 subclass. They are:
1. Graphene
2. MXenes
3. Transition Metal Dichalcogenides(TMDCs), sometime abbreviate TMDs
4. Transition Metal Oxides (TMOs)
5. Hexagonal Boron-nitride (h-BN) All these 2D materials are ONE or Several atoms thick and all are derived from their 3D counterparts. For instance, graphene derived from 3D graphite block and similarly MXenes derived from the MAX phases.
The list of 2D materials is much wider. I would include micas, clay minerals like kaolin, transition metal halides like CrI3. Very high anisotropy is possessed by the so-called. intergrowth materials (otherwise they are also called misfit). Surely this is not a complete list.
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