Single-crystal-like hematite colloidal nanocrystal clusters: synthesis and applications in gas sensors, photocatalysis and water treatment

Fang, Xiaoliang; Chen, Cheng; Jin, Mingshang; Kuang, Qin; Xie, Zhaoxiong; Xie, Su‐Yuan; Huang, Rong‐Bin; Zheng, Lan‐Sun

doi:10.1039/b905034e

Cited by 141 publications

(107 citation statements)

References 59 publications

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“…These are the remains of ferric chloride, which can also be seen in the rest of the fibril as light grey particles. The FFT signals for hematite deposited on chitin correspond to previously published data for pure hematite nanoparticles [56,57].…”

Section: Discussionmentioning

confidence: 99%

“…Combination of various biopolymers with hematite is of high interest to scientists in over a range of fields [58], from the development of advanced drug carriers [59], targeted magnetic resonance imaging of tumors [60] to biosensors [56,61] supercapacitors [62], adsorbents [63,64] and catalysts for chemical reactions [65]. Several studies regarding the use of biological templates in hydrothermal synthesis of hematite have been performed.…”

Section: Discussionmentioning

confidence: 99%

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Renewable chitin from marine sponge as a thermostable biological template for hydrothermal synthesis of hematite nanospheres using principles of extreme biomimetics

Wysokowski

Petrenko

Motylenko

et al. 2015

Bioinspired Materials

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range of uses. Here, chitin-based scaffolds isolated from the skeleton of marine demosponge Aplysina aerophoba were used as a template for the in vitro formation of iron oxide from a saturated iron(III) chloride solution, under hydrothermal conditions (pH~1.5, 90 °C). The resultant chitin-Fe 2 O 3 three dimensional composites, prepared for the first time via hydrothermal synthesis route, were thoroughly characterized using light, fluorescence and scanning electron microscopy; as well as with analytical methods like Raman spectroscopy, electron diffraction and HR-TEM. The results show that this versatile method allows for efficient chitin mineralization with respect to hematite. Additionally, we demonstrate that chitin nanofibers template the nucleation of uniform Fe 2 O 3 nanocrystals.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Renewable chitin from marine sponge as a thermostable biological template for hydrothermal synthesis of hematite nanospheres using principles of extreme biomimetics

Wysokowski

Petrenko

Motylenko

et al. 2015

Bioinspired Materials

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“…Over the past decade, there has been a considerable progress in the synthesis of single-crystal, colloidal nanoscale magnetic particles, namely nanocrystals (NCs), because of their strong exploitation in various application fields extending from photocatalysis 1 and magnetic storage to biomedicine 2 . Complex nanoparticles (NPs) of this form are particularly appealing as the magnetic phases they carry exhibit different physical behaviour from their bulk counterparts.…”

Section: Introductionmentioning

confidence: 99%

Assembly-mediated interplay of dipolar interactions and surface spin disorder in colloidal maghemite nanoclusters

et al. 2014

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Controlled assembly of single-crystal, colloidal maghemite nanoparticles is facilitated via a high-temperature polyol-based pathway. Structural characterization shows that size-tunable nanoclusters of 50 and 86 nm diameters (D), with high dispersibility in aqueous media, are composed of ~13 nm (d) crystallographically oriented nanoparticles. The interaction effects are examined against the increasing volume fraction, φ, of the inorganic magnetic phase that goes from individual colloidal nanoparticles (φ= 0.47) to clusters (φ= 0.72). The frozen-liquid dispersions of the latter exhibit weak ferrimagnetic behavior at 300 K. Comparative Mössbauer spectroscopic studies imply that intra-cluster interactions come into play. A new insight emerges from the clusters' temperature-dependent ac susceptibility that displays two maxima in χ''(T), with strong frequency dispersion. Scaling-law analysis, together with the observed memory effects suggest that a superspin glass state settles-in at T B~ 160-200 K, while at lowertemperatures, surface spin-glass freezing is established at T f~ 40-70 K. In such nanoparticleassembled systems, with increased φ, Monte Carlo simulations corroborate the role of the inter-particle dipolar interactions and that of the constituent nanoparticles' surface spin disorder in the emerging spin-glass dynamics.

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“…A metallic precursor, such as metal chlorides [14-16, 25, 26, 28, 31, 33, 35, 77-87] or acetylacetonates [36,[88][89][90] are dissolved in a solvent like ether [36,[88][89][90], or glycol [14,15,25,26,31,33,35,77,[79][80][81][82][83][84][85][86][87], or water [16], or THF-ethanol [28] in a glass flask equipped with a heating mantle or in an autoclave (Figure 2A-E). A capping agent is also added in the reaction mixture at room temperature (Table 1) to control the size and the shape of the system.…”

Section: Organometallic and Solvothermal Routesmentioning

confidence: 99%

“…Different morphologies, compact or loose structures with diameters ranging from 30 to a few hundred nm have been obtained with the previous synthesis strategies. Colloidal assemblies of inorganic nanocrystals are commonly called nanoclusters [15,[21][22][23][24][25][26][27][28][29], but in the literature, they can also be found as nanoflowers [30], nanoroses [17], multi-core particles [31,32], nanoassemblies [13,14,33,34], porous particles [35], flower-like mesocrystals [36], nanobeads [37,38], and pomegranate-like particles [34]. Furthermore, it is worth noting that these can be delivered with diverse chemical origin, including nanoclusters of ZnO [39,40], Co 3 O 4 [41], CuO [42], In 2 O 3 [40], CoO [40], MnO [40], ZnSe [40], CuCr 2 S 4 [43], PbS [44], and TiO 2 [45].…”

Section: Introductionmentioning

confidence: 99%

Colloidal magnetic nanocrystal clusters: variable length-scale interaction mechanisms, synergetic functionalities and technological advantages

Κωστοπούλου

Lappas

2015

Nanotechnology Reviews

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Magnetic particles of optimized nanoscale dimensions can be utilized as building blocks to generate colloidal nanocrystal assemblies with controlled size, well-defined morphology, and tailored properties. Recent advances in the state-of-the-art surfactant-assisted approaches for the directed aggregation of inorganic nanocrystals into cluster-like entities are discussed, and the synthesis parameters that determine their geometrical arrangement are highlighted. This review pays attention to the enhanced physical properties of iron oxide nanoclusters, while it also points to their emerging collective magnetic response. The current progress in experiment and theory for evaluating the strength and the role of intra-and inter-cluster interactions is analyzed in view of the spatial arrangement of the component nanocrystals. Numerous approaches have been proposed for the critical role of dipole-dipole and exchange interactions in establishing the nature of the nanoclusters' cooperative magnetic behavior (be it ferromagnetic or spin-glass like). Finally, we point out why the purposeful engineering of the nanoclusters' magnetic characteristics, including their surface functionality, may facilitate their use in diverse technological sectors ranging from nanomedicine and photonics to catalysis.

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Single-crystal-like hematite colloidal nanocrystal clusters: synthesis and applications in gas sensors, photocatalysis and water treatment

Cited by 141 publications

References 59 publications

Renewable chitin from marine sponge as a thermostable biological template for hydrothermal synthesis of hematite nanospheres using principles of extreme biomimetics

Renewable chitin from marine sponge as a thermostable biological template for hydrothermal synthesis of hematite nanospheres using principles of extreme biomimetics

Assembly-mediated interplay of dipolar interactions and surface spin disorder in colloidal maghemite nanoclusters

Colloidal magnetic nanocrystal clusters: variable length-scale interaction mechanisms, synergetic functionalities and technological advantages

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