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Title: Electrochemically grafted polypyrrole changes photoluminescence of electronic states inside nanocrystalline diamond

Hybrid diamond-organic interfaces are considered attractive for diverse applications ranging from electronics and energy conversion to medicine. Here we use time-resolved and time-integrated photoluminescence spectroscopy in visible spectral range (380–700 nm) to study electronic processes in H-terminated nanocrystalline diamond films (NCD) with 150 nm thin, electrochemically deposited polypyrrole (PPy) layer. We observe changes in dynamics of NCD photoluminescence as well as in its time-integrated spectra after polymer deposition. The effect is reversible. We propose a model where the PPy layer on the NCD surface promotes spatial separation of photo-generated charge carriers both in non-diamond carbon phase and in bulk diamond. By comparing different NCD thicknesses we show that the effect goes as much as 200 nm deep inside the NCD film.
Authors:
;  [1] ; ; ;  [2]
  1. Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 3, Prague 121 16 (Czech Republic)
  2. Institute of Physics ASCR v.v.i., Cukrovarnická 10, Prague 160 00 (Czech Republic)
Publication Date:
OSTI Identifier:
22402756
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 22; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CHARGE CARRIERS; CRYSTALS; DEPOSITION; DEPOSITS; DIAMONDS; ELECTROCHEMISTRY; ENERGY CONVERSION; FILMS; GRAFTS; LAYERS; NANOSTRUCTURES; PHOTOLUMINESCENCE; POLYMERS; SPECTROSCOPY; SURFACES; THICKNESS; TIME RESOLUTION