Abstract
We report facile preparation of water dispersible CuS quantum dots (2–4 nm) and nanoparticles (5–11 nm) through a nontoxic, green, one-pot synthesis method. Optical and microstructural studies indicate the presence of surface states and defects (dislocations, stacking faults, and twins) in the quantum dots. The smaller crystallite size and quantum dot formation have significant effects on the high energy excitonic and low energy plasmonic absorption bands. Effective two-photon absorption coefficients measured using 100 fs laser pulses employing open-aperture Z-scan in the plasmonic region of 800 nm reveal that CuS quantum dots are better ultrafast optical limiters compared to CuS nanoparticles.
Highlights
Role of surface states and defects in the ultrafast nonlinear optical properties of CuS quantum dots
Considering the photonic applications of semiconductor plasmonic materials, in addition to exploring their surface plasmon resonances (SPR) properties, it is crucial to understand how the nonlinear optical properties evolve from quantum dots to nanoparticles
In the present article we report the synthesis of CuS quantum dots (QDs) (2–4 nm) and NPs (5–11nm) through a soft chemical route, by using polyvinylpyrolidine (PVP) as the capping agent
Summary
Role of surface states and defects in the ultrafast nonlinear optical properties of CuS quantum dots. Nonlinear optical absorption of CuS QDs and NPs using open aperture Z-scan at the near-resonant SPR wavelength of 800 nm.
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