(La,Sr)CoO 3 /ZnO nanofilm–nanorod diode arrays for photo-responsive moisture and humidity detection

et al. 2012

Adv Funct Materials

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A nanocomposite fi lm of La 0.67 Sr 0.33 MnO 3 (LSMO):ZnO is synthesized by depositing LSMO solution on a vertical array of ZnO nanorods grown on (0001) Al 2 O 3 substrate. The magnetic behavior of the composite fi lm differs from that of a pure LSMO fi lm, possibly due to smaller grain size in the composite, small amount of Zn doping, or the presence of nonmagnetic ZnO phase near the LSMO grain boundaries. Magnetotransport measurements show that the low-fi eld magnetoresistance (LFMR) of the nanocomposite fi lm is signifi cantly enhanced as compared to that observed for pure LSMO fi lm. The highest value of the LFMR of the nanocomposite fi lm at 10 K is -23.9% with a magnetic fi eld of 0.5 T applied parallel to the current.

“…After ZnO nanorod growth, the samples were taken out, rinsed, cleaned with DI water several times, and dried overnight. More details can be found in 33.…”

Section: Methodsmentioning

confidence: 99%

Low‐Field Magnetoresistance in La_0.67Sr_0.33MnO₃:ZnO Composite Film

Staruch

et al. 2012

Adv Funct Materials

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“…Hierarchical composite nanostructures can also be utilized in humidity monitoring and detection. Similar to the ZnO/LSCO photocatalyst preparation, we have grown ZnO/LSCO core-shell nanorod arrays using facile hydrothermal growth followed by the sol-gel deposition (Gao et al, 2010 ). The uniform coating of perovskite is achieved by carefully controlled solution pH.…”

Section: Hierarchical Nanostructures For Environmental Gas Sensing Mmentioning

confidence: 99%

Hierarchically nanostructured materials for sustainable environmental applications

et al. 2013

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This review presents a comprehensive overview of the hierarchical nanostructured materials with either geometry or composition complexity in environmental applications. The hierarchical nanostructures offer advantages of high surface area, synergistic interactions, and multiple functionalities toward water remediation, biosensing, environmental gas sensing and monitoring as well as catalytic gas treatment. Recent advances in synthetic strategies for various hierarchical morphologies such as hollow spheres and urchin-shaped architectures have been reviewed. In addition to the chemical synthesis, the physical mechanisms associated with the materials design and device fabrication have been discussed for each specific application. The development and application of hierarchical complex perovskite oxide nanostructures have also been introduced in photocatalytic water remediation, gas sensing, and catalytic converter. Hierarchical nanostructures will open up many possibilities for materials design and device fabrication in environmental chemistry and technology.

“…Here in this section, we present our latest progress on the fabrication and utilization of metal oxide/perovskite (or spinel) composite nanowires for environmental catalysis and chemical sensing [10,11,13,14]. …”

Section: Self-assembly and Utilization Of Oxide-based Nanoarchitecmentioning

confidence: 99%

Hierarchical Assembly of Multifunctional Oxide-based Composite Nanostructures for Energy and Environmental Applications

Shimpi

et al. 2012

IJMS

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Composite nanoarchitectures represent a class of nanostructured entities that integrates various dissimilar nanoscale building blocks including nanoparticles, nanowires, and nanofilms toward realizing multifunctional characteristics. A broad array of composite nanoarchitectures can be designed and fabricated, involving generic materials such as metal, ceramics, and polymers in nanoscale form. In this review, we will highlight the latest progress on composite nanostructures in our research group, particularly on various metal oxides including binary semiconductors, ABO3-type perovskites, A2BO4 spinels and quaternary dielectric hydroxyl metal oxides (AB(OH)6) with diverse application potential. Through a generic template strategy in conjunction with various synthetic approaches— such as hydrothermal decomposition, colloidal deposition, physical sputtering, thermal decomposition and thermal oxidation, semiconductor oxide alloy nanowires, metal oxide/perovskite (spinel) composite nanowires, stannate based nanocompostes, as well as semiconductor heterojunction—arrays and networks have been self-assembled in large scale and are being developed as promising classes of composite nanoarchitectures, which may open a new array of advanced nanotechnologies in solid state lighting, solar absorption, photocatalysis and battery, auto-emission control, and chemical sensing.