Electrochemical deposition and photovoltaic properties of Nano-Fe2O3-incorporated polypyrrole films

Zhang, Peng; Yang, Zhanxu; Wang, D.J.; Kan, Shihai; Chai, Xiangdong; Liu, J.Z.; Li, T.J.

doi:10.1016/s0379-6779(97)80695-9

Cited by 25 publications

(8 citation statements)

References 5 publications

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“…As such, magnetic Fe 2 O 3 nanoparticles find potential applications in many areas including high density magnetic information storage devices [2], ferro-fluid [3], magnetic resonance imaging agents [4], hyperthermic treatment of tumours [5], controlled drug delivery [6], bioseparation [7], and transparent magnetic composites [8]. Fe 2 O 3 nanoparticles are also of particular importance in the applications as catalysts [9], sensors [10] and photovoltaics [11]. Among many polymorphs of Fe 2 O 3 , ␥-Fe 2 O 3 (maghemite) and Fe 3 O 4 (magnetite) have strong magnetic properties .…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties of mechanochemically synthesized γ-Fe2O3 nanoparticles

Tsuzuki

Schäffel

Muroi³

et al. 2011

Journal of Alloys and Compounds

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The synthesis of mono-dispersed ␥-Fe 2 O 3 nanoparticles by mechanochemical processing was demonstrated for the first time, via the solid-state exchange reaction Fe 2 (SO 4 ) 3 + 3Na 2 CO 3 → Fe 2 (CO 3 ) 3 + 3Na 2 SO 4 → Fe 2 O 3 + 3Na 2 SO 4 + 3CO 2 (g) and subsequent heat treatment at 673 K. The nanoparticles had a volume-weighted mean diameter of 6 nm and a narrow size distribution with the standard deviation of 3 nm. The particles showed a superparamagnetic nature with the superparamagnetic blocking temperature of 56.6 K. The anisotropy constant was 6.0 × 10 6 erg/cm 3 , two orders of magnitude larger than the magnetocrystalline anisotropy constant of bulk ␥-Fe 2 O 3 . The detailed analysis of the magnetic properties indicated that the ␥-Fe 2 O 3 nanoparticles had a core-shell structure, consisting of a ferrimagnetic core of ∼4 nm in diameter having a collinear spin configuration and a magnetically disordered shell of ∼1.2 nm in thickness.

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Section: Introductionmentioning

confidence: 99%

Magnetic properties of mechanochemically synthesized γ-Fe2O3 nanoparticles

Tsuzuki

Schäffel

Muroi³

et al. 2011

Journal of Alloys and Compounds

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“…Meanwhile, in order to achieve a new function of PPy, one of the most efficient methods is to prepare PPy-based composite films where new chemical components, such as nanoparticles of Fe 2 O 3 [11] and Pd [12] or nanostructure clays [13,14], are introduced. Compact morphology of the PPy nanocomposites will shows different physical and chemical properties respect to the (1) *To whom correspondence should be addressed: Email: sadrnezh@sharif.edu Phone: +98 261 6210009, Fax: +98 261 6201877 Impedance Analysis of Growth and Morphology of Electropolymerized Polypyrrole Nanocomposites Morteza Torabi 1,2 , M. Soltani 3,4 and S.K.…”

mentioning

confidence: 99%

Impedance Analysis of Growth and Morphology of Electropolymerized Polypyrrole Nanocomposites

Torabi¹,

Soltani²,

Sadrnezhaad³

2014

J. New Mat. Electrochem. Sys.

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Pure polypyrrole (PPy), PPy/Al2O3 and PPy/SiO2 nanocomposites synthesized galvanostatically using different polymerization charges. Electrochemical impedance measurements of pure polypyrrole revealed that the film thickness affected the impedance responses. The characteristic frequencies vs. film thickness that obtained using Cole-Cole plots showed that electrodeposition mechanism changed from 3D to 1D after nuclei overlapping for pure PPy. Analysis of the nanocomposites impedance spectrums revealed no changes during the film growth, i.e. deposition continues 3D even after nuclei overlapping. Scanning electron microscopy (SEM) confirmed the impedance results and showed that the morphology of the thick pure PPy film is 1D, while the deposition of the nanocomposites was 3D with compact and very fine structure.

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“…Recently, semiconducting iron oxide (n-Fe 2 O 3 ) has been widely used for various electronics, especially sensor, − photocatalyst, photovoltaic, , and water splitting, − because of its small bandgap (∼2.1 eV) and large abundance on the Earth. While the iron oxide micro-/nanostructure can be fabricated by conventional methods, such as evaporation and thermal oxidation , which use high temperature and high pressure, Vayssieres et al reported facile fabrication of the iron oxide nanostructure array by an aqueous solution process.…”

Section: Introductionmentioning

confidence: 99%

Digital 3D Local Growth of Iron Oxide Micro- and Nanorods by Laser-Induced Photothermal Chemical Liquid Growth

et al. 2014

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We introduce laser growth of iron oxide micro and nanorods by the photothermal chemical liquid growth method at low temperature, ambient pressure, and solution environment. By focusing a 532 nm continuous-wave laser on a Pt substrate immersed in iron oxide precursor solution, vertically aligned iron oxide micro- and nanorods are successfully fabricated with the length up to >100 μm, whereas the length can be easily controlled by changing the laser power or the illumination time. It is also found that the direction of the laser ray determines the growth direction of the iron oxide micro- and nanorods, which is the property that makes this process suitable for the fabrication of complex 3D structures as confirmed by making an iron oxide junction and kinked iron oxide microrod structure. Moreover, the resultant iron oxide microrod is applied as a microtemplate for the growth of nanostructure to show that this process can be further integrated to other 3D structures to achieve trans-scale hierarchical structures.

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Electrochemical deposition and photovoltaic properties of Nano-Fe2O3-incorporated polypyrrole films

Cited by 25 publications

References 5 publications

Magnetic properties of mechanochemically synthesized γ-Fe2O3 nanoparticles

Magnetic properties of mechanochemically synthesized γ-Fe2O3 nanoparticles

Impedance Analysis of Growth and Morphology of Electropolymerized Polypyrrole Nanocomposites

Digital 3D Local Growth of Iron Oxide Micro- and Nanorods by Laser-Induced Photothermal Chemical Liquid Growth

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