1. Belle Sow, Dr Lu Junpeng, Professor Sow Chorng Haur
Microlandscaping of Nanoparticles on 2D Transitional Metal Dichalcogenide Films for enhanced functionality
Belle Sow, Dr Lu Junpeng, Professor Sow Chorng Haur
We used gold nanoparticles as a nanoexplorer on a MICROFLAKE to reveal the properties and hidden features of this new material.
Microflake
Hidden

2. Background information
Transitional Metal Dichalcogenides
differing monolayer and bulk layer properties
monolayer TMDs exhibit photoluminescence while bulk layer TMDs do not
WS2: emit red light
Monolayer
Bulk layer

3. Purpose of Research
Monolayer TMDs have varying photoluminescence intensities
attributed to chemical heterogeneity

4. Purpose of Research Au NPs= Nanoexplorers!
WS2: attractive system for gold nanoparticles (Au NPs) deposition
Preferential decoration
know more about the system and its properties
Au NPs=
Nanoexplorers!

5. Results and discussion
Heterogeneity in monoflakes
Effect of Au NPs on photoluminescence
Selective Deposition of Au NPs
Density of AU NPs on photoluminescence
Results and discussion

6. Heterogeneity in monoflakes
FM/ PL: varying degrees of photoluminescence, at edges, and concentric bright interior

7. 2. Effects of Au NPs on photoluminescence
Enhancement was not uniform
Shows interior details

8. 3. Selective Deposition of Au NPs
High density of Au NPs deposition
:monolayer-bulk layer boundary

9. 3. Selective Deposition of Au NPs
Fluorescence boundaries: alternating bright and dark bands within monoflake

10. 10μm

11. 10μm

12. 4. Density of Au NPs on photoluminescence
Optimal enhancement→ sparse deposition

13. 4. Density of Au NPs on photoluminescence
Decrease in photoluminescence high density of gold deposition

14. Conclusion Found chemical and structural heterogeneity in the flake
Gold deposition: characterisation method
Sucessful deposition of Au NPs on monoflake, enabling localised photoluminescence enhancement

15. The End!