Pd@SnO2 and SnO2@Pd Core@Shell Nanocomposite Sensors |
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| Authors: | Fabian Gyger André Sackmann Michael Hübner Pascal Bockstaller Dagmar Gerthsen Henning Lichtenberg Jan‐Dierk Grunwaldt Nicolae Barsan Udo Weimar Claus Feldmann |
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| Institution: | 1. Institut für Anorganische Chemie, Karlsruhe Institute of Technology (KIT), , D‐76131 Karlsruhe, Germany;2. Institut für Physikalische und Theoretische Chemie, Universit?t Tübingen, , D‐72076 Tübingen, Germany;3. Laboratorium für Elektronenmikroskopie, Karlsruhe Institute of Technology (KIT), , D‐76131 Karlsruhe, Germany;4. Institut für Technische Chemie und Polymerchemie, Karlsruhe Institute of Technology (KIT), , D‐76131 Karlsruhe, Germany |
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| Abstract: | Pd@SnO2 and SnO2@Pd core@shell nanocomposites are prepared via a microemulsion approach. Both nanocomposites exhibit high‐surface, porous matrices of SnO2 shells (>150 m2 g?1) with very small SnO2 crystallites (<10 nm) and palladium (Pd) nanoparticles (<10 nm) that are uniformly distributed in the porous SnO2 matrix. Although similar by first sight, Pd@SnO2 and SnO2@Pd are significantly different in view of their structure with Pd inside or outside the SnO2 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 H2. Especially, the Pd@SnO2 core@shell nanocomposite is unique and shows a fast response time (τ90 < 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@SnO2 nanocomposite to CO in humid air. Under these conditions, even commercial sensors (Figaro TGS 2442, Applied Sensor MLC, E2V MICS 5521) are outperformed. |
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| Keywords: | sensors nanocomposites core– shell structures tin oxide palladium |
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