Publication date: 2nd November 2020
Transition metal dichalcogenide (TMD) nanosheets with defect-rich and vertically aligned edges are highly advantageous for various catalytic applications. Synthesis of TMDs using the colloidal techniques opens various possibilities to tune the electronic and optical properties of these 2D materials. As an example, we choose MoSe2 nanosheets that have plenty of defects. The defect sites are responsible for adsorption on the surface thereby yielding excellent electrocatalytic hydrogen evolution and other catalytic activities on the surface.
Further, these defects can be employed as seeding points to grow other materials on them. Cu2S in these defect sites leads to a Type-II semiconductor heterojunction that allows for charge separation and therefore the MoSe2-Cu2S forms a superior material for generation of photocurrent.
Now even heterojunctions of MoSe2, a hexagonal crystal with CsPbBr3 – a perovskite have been enabled by use of a linker molecule 4 – aminothiophenol. Enhanced photocurrents are obtained with such a nanoheterostructure. This methodology further opens up avenues for forming heterostructures with large lattice mismatches and can therefore be of great potential use.
References
Colloidally Synthesized Defect-Rich MoSe2 Nanosheets for Superior Catalytic Activity, Md. S. Hassan, A. Jana, S. Gahlawat, N. Bhandary, S. Bera, P. P. Ingole, S. Sapra, Bull. Mater. Sci. (2018)..
Functionalized 2D-MoS2 Incorporated Polymer Ternary Solar Cells: Role of Nanosheets Induced Long range Ordering of Polymer Chains on Charge Transport, R. Ahmad, R. Srivastava, S. Yadav, S. Chand, S. Sapra, ACS Appl. Mater. Interfaces 9, 34111 (2017).
Functionalized MoS2 Nanosheets for 0D-2D Hybrid Nanostructure: Photoinduced Charge Transfer and Enhanced Photoresponse, R. Ahmad, R. Srivastava, S. Yadav, D. Singh, G. Gupta, S. Chand, S. Sapra, J. Phys. Chem. Lett. 8,1729 (2017).
Design of MoSe2-Cu2S Vertical p-n Nanoheterostructures through Passivation of Defects to Tune the Optoelectronic Properties for Photonic Applications, Md. S. Hassan, S. Bera, D. Gupta, S. K. Ray, S. Sapra, ACS Appl. Mater. Interfaces 11, 4074 (2019).
Enhanced Photocurrent owing to Shuttling of Charge Carriers across 4-Aminothiophenol Functionalized MoSe2-CsPbBr3 Nanohybrids, Md. S. Hassan, P. Basera, S. Bera, M. Mittal, S. K. Ray, S. Bhattacharya, S. Sapra, ACS Appl. Mater. Interfaces 12, 7317 (2020).
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