Question
Which is not an example of 2D material ?
This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
ZnO (Zinc oxide)
2D Material Definition
Two-dimensional (2D) materials are crystals with thicknesses of only one or a few atoms. They exhibit unique physical and chemical properties compared to their bulk counterparts due to quantum confinement effects.
Evaluating Material Options
Let's analyze each option to determine which is not typically considered a 2D material:
- hBN (Hexagonal boron nitride): Often called "white graphene," hBN is a single-layer material structurally similar to graphene and is a well-known 2D material.
- MoS$_2$ (Molybdenum disulfide): This is a transition metal dichalcogenide. Single-layer and few-layer MoS$_2$ are widely studied as 2D semiconductor materials.
- GO (Graphene oxide): Derived from graphene, graphene oxide retains a 2D structure, although it contains oxygen functional groups. It's considered within the scope of 2D materials research.
- ZnO (Zinc oxide): While ZnO can be fabricated into thin films, nanowires, or nanoparticles, its fundamental form is a bulk semiconductor. It is not inherently a layered structure like graphene or hBN that easily exfoliates into 2D sheets. Therefore, it is not typically classified alongside graphene, hBN, and MoS$_2$ as a quintessential 2D material.
Conclusion
Based on the analysis, Zinc oxide (ZnO) is the material among the options that is not fundamentally classified as a 2D material.
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