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Title

Bendable Polycrystalline and Magnetic CoFe2O4 Membranes by Chemical Methods

AuthorsSallés, Pol; Guzmán, Roger CSIC ORCID; Zanders, David; Quintana, Alberto; Fina, Ignasi CSIC ORCID CVN ; Sánchez Barrera, Florencio CSIC ORCID; Zhou, Wu; Devi, Anjana; Coll, Mariona CSIC ORCID
KeywordsCoFe2O4
Sr3Al2O6
Atomic layer deposition
Flexible device
Sacrificial layer
Solution processing
Issue Date16-Mar-2022
PublisherAmerican Chemical Society
CitationACS Applied Materials and Interfaces 14(10): 12845–12854 (2022)
AbstractThe preparation and manipulation of crystalline yet bendable functional complex oxide membranes has been a long-standing issue for a myriad of applications, in particular, for flexible electronics. Here, we investigate the viability to prepare magnetic and crystalline CoFe2O4 (CFO) membranes by means of the Sr3Al2O6 (SAO) sacrificial layer approach using chemical deposition techniques. Meticulous chemical and structural study of the SAO surface and SAO/CFO interface properties have allowed us to identify the formation of an amorphous SAO capping layer and carbonates upon air exposure, which dictate the crystalline quality of the subsequent CFO film growth. Vacuum annealing at 800 °C of SAO films promotes the elimination of the surface carbonates and the reconstruction of the SAO surface crystallinity. Ex-situ atomic layer deposition of CFO films at 250 °C on air-exposed SAO offers the opportunity to avoid high-temperature growth while achieving polycrystalline CFO films that can be successfully transferred to a polymer support preserving the magnetic properties under bending. Float on and transfer provides an alternative route to prepare freestanding and wrinkle-free CFO membrane films. The advances and challenges presented in this work are expected to help increase the capabilities to grow different oxide compositions and heterostructures of freestanding films and their range of functional properties.
Publisher version (URL)http://dx.doi.org/10.1021/acsami.1c24450
URIhttp://hdl.handle.net/10261/265261
DOI10.1021/acsami.1c24450
ISSN1944-8244
Appears in Collections:(ICMAB) Artículos




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