Journalartikel

Jahr der Veröffentlichung: 2015

Seiten: 1281-1288

Zeitschrift: physica status solidi (a) – applications and materials science

Bandnummer: 212

Heftnummer: 6

ISSN: 1862-6300

DOI Link: https://doi.org/10.1002/pssa.201431735

Verlag: Wiley

Abstract: 
We present a new concept for the detection of hydrogen sulfide (H2S) doses based on percolation effects in semiconducting (p-type) copper (II) oxide (CuO) thin films. Under H2S exposure at 180 degrees C CuO undergoes a chemical reaction to metallic conducting copper (II) sulfide (CuS). Reaching a certain dose of H2S (concentrationxexposure time) the conductance increases rapidly by two orders of magnitude which is attributed to the formation of CuS percolation paths. This study focuses on the reproducibility of this effect as well as on theoretical modeling of the assumed underlying percolation mechanism. Analysis of conductance data reveals a behavior that is qualitatively very similar to standard scaling theory, but with a lower conductance exponent of mu approximate to 0.85 (instead of 1.3 for 2D systems). The deviation can be explained by a superimposing diffusion process and by deviations of the experimental systems from standard percolation systems. Nevertheless, the CuO thin films exhibit intrinsic structure controlled thresholds for H2S doses, which allows the utilization as H2S dosimeter. Conductance behavior of a CuO thin film exposed to 20ppm H2S at 180 degrees C. The percolation threshold p(c) is reached 1054s after start of the measurement.

Harvard-Zitierstil: Hennemann, J., Kohl, C., Smarsly, B., Sauerwald, T., Teissier, J., Russ, S., et al. (2015) CuO thin films for the detection of H2S doses : Investigation and application, physica status solidi (a) – applications and materials science, 212(6), pp. 1281-1288. https://doi.org/10.1002/pssa.201431735

APA-Zitierstil: Hennemann, J., Kohl, C., Smarsly, B., Sauerwald, T., Teissier, J., Russ, S., & Wagner, T. (2015). CuO thin films for the detection of H2S doses : Investigation and application. physica status solidi (a) – applications and materials science. 212(6), 1281-1288. https://doi.org/10.1002/pssa.201431735