Catkin liked nano-CO3O^sub 4^ catalyst built-in organic microreactor by PEMOCVD method for trace CO oxidation at room temperature

• Published in: Microfluidics and nanofluidics Vol. 16; no. 1-2; p. 141
• Main Authors: Chen, G L, Guyon, C, Zhang, Z X, Da Silva, B, Da Costa, P, Ognier, S, Bonn, D, Tatoulian, M
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer Nature B.V 01-01-2014
• Subjects: Oxidation
• ISSN: 1613-4982; 1613-4990
• DOI: 10.1007/s10404-013-1220-y

In this paper, tricobalt tetraoxide (CO3O^sub 4^) catalyst was coated on the polydimethylsiloxane microchannel by the plasma-enhanced metal-organic chemical vapor deposition technology. The obtained CO3O^sub 4^ film was characterized by SEM, XRD, XPS, and TEM, and the results show that the as-deposited CO3O^sub 4^ film was initially composed of many cauliflowers-shaped microclusters. Also, the microcauliflower was transformed from an amorphous phase to a crystal phase when the CO3O^sub 4^ film was treated by Ar and O2 plasma for more than 20 min, and the crystal lattice line occurred on the surface of nano-sized-CO3O^sub 4^ particles. Meanwhile, the interface of CO3O^sub 4^ particles with diameter between 3 and 12 nm became obvious and some nano-catkin structures were also formed on the CO3O^sub 4^ film. The ratio of Co^sup 3+^/Co^sup 2+^ in the spinel-type CO3O^sub 4^ was nearly 2, and the nano-particles predominantly expose their {311}, {111}, and {220} planes. These morphologies and structure characteristics were found to be ideal for increasing the catalytic activity efficiency of CO3O^sub 4^ for CO oxidation, and the catalytic stability of CO3O^sub 4^ coated on the organic microreactor lasted nearly 85 h for trace CO oxidation at room temperature.[PUBLICATION ABSTRACT]