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Title: Charge storage in β-FeSi{sub 2} nanoparticles

We report on the observation of a surprisingly high specific capacitance of β-FeSi{sub 2} nanoparticle layers. Lateral, interdigitated capacitor structures were fabricated on thermally grown silicon dioxide and covered with β-FeSi{sub 2} particles by drop or spin casting. The β-FeSi{sub 2}-nanoparticles, with crystallite sizes in the range of 10–30 nm, were fabricated by gas phase synthesis in a hot wall reactor. Compared to the bare electrodes, the nanoparticle-coated samples exhibit a 3–4 orders of magnitude increased capacitance. Time-resolved current voltage measurements show that for short times (seconds to minutes), the material is capable of storing up to 1 As/g at voltages of around 1 V. The devices are robust and exhibit long-term stability under ambient conditions. The specific capacitance is highest for a saturated relative humidity, while for a relative humidity below 40% the capacitance is almost indistinguishable from a nanoparticle-free reference sample. The devices work without the need of a fluid phase, the charge storing material is abundant and cost effective, and the sample design is easy to fabricate.
Authors:
; ;  [1] ; ;  [2]
  1. Fakultät für Physik and CENIDE, Universität Duisburg-Essen, D-47048 Duisburg (Germany)
  2. Institut für Verbrennung und Gasdynamik and CENIDE, Universität Duisburg-Essen, D-47048 Duisburg (Germany)
Publication Date:
OSTI Identifier:
22413050
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CAPACITANCE; COMPARATIVE EVALUATIONS; ELECTRIC CONDUCTIVITY; ELECTRIC POTENTIAL; ELECTRODES; HUMIDITY; IRON SILICIDES; LAYERS; NANOPARTICLES; PARTICLE SIZE; SILICON OXIDES; SPIN; SYNTHESIS; TIME RESOLUTION