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Title: Optical and electrical stability of viral-templated copper sulfide (Cu{sub 1.8}S) films

The optical and electrical stabilities of viral-templated non-stoichiometric copper sulfide, digenite (Cu{sub 1.8}S) films were investigated. The films were composed of large agglomerates of randomly aligned Cu{sub 1.8}S-coated M13 filamentous phage. Free carrier optical absorption associated with localized surface plasmon resonance (LSPR) was observed in the near infrared spectral region, and the films were electrically active, displaying a linear current-voltage relationship. Under ambient conditions, the magnitude of the LSPR absorption increased, following a power law relationship with time, and the electrical resistance of viral-templated films decreased significantly. In contrast, the resistance of films stored under low oxygen, low humidity conditions experienced a smaller reduction in electrical resistance. Changes in optical and electrical film properties under ambient conditions were associated with an increase in free carrier concentration within the copper chalcogenide material due to oxygen exposure. X-ray photoelectron spectroscopy was used to relate this increase in free carrier concentration to compositional changes on the viral-templated material surface.
Authors:
 [1] ;  [2] ;  [1] ;  [3]
  1. Department of Electrical Engineering, University of California, Riverside, California 92521 (United States)
  2. Materials Science and Engineering Program, University of California, Riverside, California 92521 (United States)
  3. (United States)
Publication Date:
OSTI Identifier:
22273609
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 14; Other Information: (c) 2014 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; ABSORPTION; CONCENTRATION RATIO; COPPER SULFIDES; ELECTRIC CONDUCTIVITY; OXYGEN; PHASE STABILITY; PLASMONS; RESONANCE; SURFACES; THIN FILMS; X-RAY PHOTOELECTRON SPECTROSCOPY