Low‐Temperature Synthesis of Oxides in Ionic Liquids: Ozone‐Mediated Formation of Co3O4 Nanoparticles Monitored by In Situ Infrared Spectroscopy. Issue 20 (30th August 2019)

• Record Type: Journal Article
• Authors: Bauer, Tanja; Agel, Friederike; Blaumeiser, Dominik; Maisel, Sven; Görling, Andreas; Wasserscheid, Peter; Libuda, Jörg
• Is Part Of: Advanced materials interfaces. Volume 6:Issue 20(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-08-30
• Subjects: Co3O4 -- cobalt oxide -- ionic liquids -- IR spectroscopy -- ozone; Materials science -- Periodicals; 620.11
• DOI: 10.1002/admi.201900890
• Languages: English
• ISSNs: 2196-7350

Abstract

Abstract: For most functional oxides, structure‐selective synthesis is the key for the task‐specific production of nanomaterials. Herein, the low‐temperature synthesis in ionic liquids (ILs) is an attractive strategy to produce nanomaterials which are not accessible otherwise is described. In this study, a bench‐scale synthesis route toward Co3 O4 by applying O3 on the molecular precursor Co2 (CO)8 in IL medium is reported. The Co3 O4 nanoparticles (NPs) are characterized by infrared (IR) spectroscopy, X‐ray diffraction (XRD), and transmission electron microscopy (TEM). This protocol yields Co3 O4 with good crystallinity and narrow size distribution. In addition to conventional materials characterization, a new experimental approach is described in which the material synthesis in situ by IR reflection absorption spectroscopy (IRAS) (in situ IRAS) is followed. The in situ approach provides additional information on the growth mechanisms and kinetics and confirms that O3 treatment of Co2 (CO)8 in IL exclusively yields pure Co3 O4 without the formation of byproducts or intermediates. Abstract : In the cobalt oxide system, a structure‐selective synthesis is key to the production of task‐specific nanomaterials. Bench‐scale synthesis routes toward Co3 O4 are investigated by applying O3 on Co2 (CO)8 in ionic liquid (IL) medium, the products are characterized, and the growth process is followed with in situ infrared reflection absorption spectroscopy. The O3 treatment of Co2 (CO)8 in IL exclusively leads to Co3 O4 without the formation of byproducts or intermediates.