Enhanced ammonia detection using wrinkled porous CoFe2O4 double-shelled spheres prepared by a thermally driven contraction process

• Published in: Sensors and actuators. B, Chemical Vol. 314; p. 128085
• Main Authors: Wang, Lianqiang, Wang, Yanzhe, Tian, Hongwei, Qiao, Liang, Zeng, Yi
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.07.2020; Elsevier Science Ltd
• Subjects: Ammonia; Cobalt ferrite; Cobalt ferrites; Double shells; Gas sensor; Hierarchical structure; Hollow sphere; Morphology; Nanoparticles; Porosity; Synthesis; Double shells; Hollow sphere; Ammonia; Gas sensor; Cobalt ferrite; Hierarchical structure
• ISSN: 0925-4005; 1873-3077
• DOI: 10.1016/j.snb.2020.128085

[Display omitted] •Rational assembly of wrinkled porous CoFe2O4 double-shelled spheres with ultrathin primary nanoparticles.•Unceasing loss of organic components maintained a highly wrinkled and porous double-shelled surfaces.•Activated double layers with less-agglomerated configuration promoted ammonia sensing characteristics. Hierarchical CoFe2O4 double-shelled hollow spheres (DHSs) with wrinkled porous surfaces are successfully synthesized via a self-templating strategy followed by a simple post-annealing process. The crystallinity, morphology, and microstructure of CoFe2O4 DHSs are detailedly characterized. The as-prepared CoFe2O4 DHSs are composed of homogeneous primary nanoparticles with uniform size and morphology that are hierarchically assembled into well-defined double-shelled spheres with high porosity. The formation mechanism of double-shelled hollow structure is also discussed. Because of their large specific surface area and easily penetrable hierarchical shells, the as-synthesized CoFe2O4 DHSs exhibit high sensitivity to ammonia and fast response-recovery capability at the optimal working temperature.