Hierarchical Formation Mechanism of CoFe2O4 Mesoporous Assemblies

被引:35
|
作者
Cannas, Carla [1 ,2 ]
Ardu, Andrea [1 ,2 ]
Musinu, Anna [1 ,2 ]
Suber, Lorenza [3 ]
Ciasca, Gabriele [4 ]
Amenitsch, Heinz [5 ]
Campi, Gaetano [6 ]
机构
[1] Univ Cagliari, Dipartimento Sci Chim & Geol, I-009042 Cagliari, Italy
[2] Univ Cagliari, INSTM, Cagliari Unit, I-009042 Cagliari, Italy
[3] CNR Ist Struttura Mat, Monterotondo Stn, I-00015 Rome, Italy
[4] Univ Cattolica Sacro Cuore, Ist Fis, I-00168 Rome, Italy
[5] Sincrotrone ELETTRA, I-34012 Trieste, Italy
[6] CNR Ist Cristallog, Monterotondo Stn, I-00015 Rome, Italy
关键词
nanoparticle synthesis; mesoporous assemblies; spinels; surfactants; mechanism; in situ time-resolved SAXS; SPINEL FERRITE NANOPARTICLES; MAGNETIC NANOPARTICLES; COBALT; PARTICLES; SPHERES; HOLLOW; ROUTE; OXIDE; SIZE;
D O I
10.1021/acsnano.5b02145
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The development of synthetic hybrid organic inorganic approaches and the understanding of the chemico-physical mechanisms leading to hierarchical assembly of nanocrystals into superstructures pave the way to the design and fabrication of multifunction microdevices able to simultaneously control processes at the nanoscale. This work deals with the design of spherical mesoporous magnetic assemblies through a surfactant assisted water-based strategy and the study of the formation mechanism by a combined use of transmission electron microscopy, X-ray diffraction, and time-resolved small angle X-ray scattering techniques. We visualize the hierarchical mechanism formation of the magnetic assemblies in the selected sodium dodecylsulfate (SDS)-assisted water-based strategy. At the first stage, an intermediate lamellar phase (L) represented by beta-Co(OH)(2) and FeOOH hexagonal plates is formed. Then, the nucleation of primary CoFe2O4 (N-1) nanocrystals of about 6-7 nm occurs by the dissolution of FeOOH and the reaction of Few ions coordinated to the SDS micelles, at the reactive sites provided by vertices and edges of the beta-Co(OH)(2) plates. The intermediate phase consumes as the primary crystalline nanoparticles form, confined by the surfactant molecules around them, and assembly in spherical mesoporous assemblies. The key role of the surfactant in the formation of porous assemblies has been evidenced by an experiment carried out in the absence of SDS and confirmed by the pore size diameter of the assemblies (about 2-3 nm), that can be correlated with the length of the surfactant dodecylsulfate molecule.
引用
收藏
页码:7277 / 7286
页数:10
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