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Published on: April 28, 2016
AuAg@CdS double-walled nanotubes: synthesis and nonlinear absorption properties
Shundong Guan1, Xiuli Fu2, Ying Tang1
1State Key Laboratory of Information Photonics and Optical Communications, and School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, P. R. China. xiulifu@bupt.edu.cn and School of Engineering and Technology, China University of Geosciences, Beijing 100083, PR China. pengzhijian@cugb.edu.cn.
Novel gold-silver/cadmium sulfide double-walled nanotubes exhibit enhanced saturated absorption due to plasmon-exciton interactions. These nanocomposites show potential for advanced nano-photonic devices.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Development of novel nanomaterials for advanced optical applications is crucial.
- One-dimensional nanostructures offer unique properties for photonic devices.
Purpose of the Study:
- To fabricate and characterize novel gold-silver/cadmium sulfide double-walled nanotubes (AuAg@CdS DWNTs).
- To investigate the nonlinear optical properties and potential applications of these DWNTs.
Main Methods:
- Three-step solvothermal synthesis using silver nanowires as templates.
- Coating a cadmium sulfide (CdS) shell onto gold-silver (AuAg) nanotubes.
- Nonlinear optical analysis under visible light excitation.
Main Results:
- Successful fabrication of AuAg@CdS DWNTs with a uniform CdS shell.
- Demonstrated saturated absorption response in AuAg@CdS DWNTs, attributed to plasmon-exciton interaction.
- Effective nonlinear absorption coefficient of AuAg@CdS DWNTs is 7 times greater than CdS shells due to local field enhancement.
Conclusions:
- AuAg@CdS DWNTs possess superior nonlinear optical properties compared to individual components.
- The unique structure and enhanced optical response make them promising for next-generation nano-photonic devices.
- Potential applications include mode-locking elements and optical switches.
