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Polydopamine-based concentric nanoshells with programmable architectures and plasmonic properties.

Chun Kit K Choi¹, Xiaolu Zhuo, Yee Ting Elaine Chiu

¹Department of Biomedical Engineering, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong. jchchoi@cuhk.edu.hk.

|October 28, 2017

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Researchers developed a fast, bottom-up method for creating complex concentric nanoshells using polydopamine. This advance enables precise control over plasmonic properties for new applications in nanoplasmonics.

Area of Science:

Nanotechnology
Materials Science
Plasmonics

Background:

Nanoshells, typically gold-silica, are crucial for nanoplasmonics and applications like sensing and cancer therapy.
Current preparation methods are laborious, limiting the development of complex nanoshells.

Purpose of the Study:

To present an efficient bottom-up assembly approach for creating complex concentric nanoshells.
To enable programmable control over nanoshell structure and plasmonic properties.

Main Methods:

Utilized polydopamine as a dielectric material due to its adhesiveness and pH-tunable charge.
Employed a rapid, room-temperature assembly process (3-4 hours per shell).
Fabricated and characterized polydopamine-based concentric nanoshells with varying gold/silver composition, nanogap thickness, and layer count.

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Main Results:

Successfully synthesized diverse polydopamine-based concentric nanoshells, including novel silver-containing structures.
Demonstrated precise control over nanogap thickness, elemental composition, and layer configuration.
Observed multiple Fano resonances and local-field hot spots, rare features for wet-chemically fabricated nanostructures.

Conclusions:

Established an efficient, versatile bottom-up method for complex nanoshell fabrication.
Provided design rules for engineering sophisticated plasmonic systems by integrating multiple plasmonic elements.
Paved the way for next-generation nanoshells with tailored functionalities.