Fe3O4–NiO core–shell composites: Hydrothermal synthesis and toluene sensing properties

• DOI: 10.1016/j.matlet.2014.06.060
• Publication Date: 2014-06-16T17:40:46Z
• Authors: Fengdong Qu; Yongfan Wang; Juan Liu; Shanpeng Wen; Yu Chen; Shengping Ruan
• Keywords: Non-blocking I/O; Hydrothermal Synthesis

Abstract Fe 3 O 4 –NiO core–shell composites were prepared via a simple one-step hydrothermal method. The synthesis was conducted in water–ethanol–butanol mixed solvent without any templates. The structure and morphology of the composites were characterized by X-Ray diffraction (XRD), X-Ray photoelectron spectroscopy (XPS) and field emission scanning electron microscopy (FESEM). The results showed that these porous architectures were assembled from Fe 3 O 4 sphere core and NiO flower-like shells. To demonstrate the use of the composites, a chemical gas sensor has been fabricated and investigated for toluene detection. The sensor exhibits excellent toluene sensing performances in terms of high response, superior selectivity, and rapid response-recovery.