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Pd@SnO 2 and SnO 2 @Pd Core@Shell Nanocomposite Sensors
Author(s) -
Gyger Fabian,
Sackmann André,
Hübner Michael,
Bockstaller Pascal,
Gerthsen Dagmar,
Lichtenberg Henning,
Grunwaldt JanDierk,
Barsan Nicolae,
Weimar Udo,
Feldmann Claus
Publication year - 2014
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.201300241
Subject(s) - nanocomposite , palladium , crystallite , materials science , shell (structure) , porosity , nanoparticle , nanotechnology , chemical engineering , chemistry , composite material , metallurgy , catalysis , biochemistry , engineering
Pd@SnO 2 and SnO 2 @Pd core@shell nanocomposites are prepared via a microemulsion approach. Both nanocomposites exhibit high‐surface, porous matrices of SnO 2 shells (>150 m 2 g −1 ) with very small SnO 2 crystallites (<10 nm) and palladium (Pd) nanoparticles (<10 nm) that are uniformly distributed in the porous SnO 2 matrix. Although similar by first sight, Pd@SnO 2 and SnO 2 @Pd are significantly different in view of their structure with Pd inside or outside the SnO 2 shell and in view of their sensor performance. As SMOX‐based sensors (SMOX: semiconducting metal oxide), both nanocomposites show a very good sensor performance for the detection of CO and H 2 . Especially, the Pd@SnO 2 core@shell nanocomposite is unique and shows a fast response time (τ 90 < 30 s) and a very good response at low temperature (<250 °C), especially under humid‐air conditions. Extraordinarily high sensor signals are observed when exposing the Pd@SnO 2 nanocomposite to CO in humid air. Under these conditions, even commercial sensors (Figaro TGS 2442, Applied Sensor MLC, E2V MICS 5521) are outperformed.