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

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.
Authors:
;  [1] ;  [2]
  1. School of Pure and Applied Physics, Mahatma Gandhi University, Kottayam 686560 (India)
  2. Light and Matter Physics Group, Raman Research Institute, C.V. Raman Avenue, Sadashivanagar, Bangalore 560080 (India)
Publication Date:
OSTI Identifier:
22304485
Resource Type:
Journal Article
Resource Relation:
Journal Name: APL Materials; Journal Volume: 2; Journal Issue: 7; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; ABSORPTION; COPPER SULFIDES; DEFECTS; DISLOCATIONS; MICROSTRUCTURE; NANOPARTICLES; OPTICAL PROPERTIES; PHOTONS; PULSES; QUANTUM DOTS; STACKING FAULTS; SURFACES; SYNTHESIS