Role of surface states and defects in the ultrafast nonlinear optical properties of CuS quantum dots

Journal Article · Tue Jul 01 00:00:00 EDT 2014 · APL Materials

DOI:https://doi.org/10.1063/1.4886276· OSTI ID:22304485

Mary, K. A. Ann; Philip, Reji ^[1]

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1. Light and Matter Physics Group, Raman Research Institute, C.V. Raman Avenue, Sadashivanagar, Bangalore 560080 (India)

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.

• OSTI ID: 22304485
• Journal Information: APL Materials, Vol. 2, Issue 7; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 2166-532X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ABSORPTION
COPPER SULFIDES
DEFECTS
DISLOCATIONS
MICROSTRUCTURE
NANOPARTICLES
OPTICAL PROPERTIES
PHOTONS
PULSES
QUANTUM DOTS
STACKING FAULTS
SURFACES
SYNTHESIS