Facile conversion of bulk metal surface to metal oxide single-crystalline nanostructures by microwave irradiation: Formation of pure or Cr-doped hematite nanostructure arrays

Cho, Seungho; Jeong, Haeyoon; Lee, Kun‐Hong

doi:10.1016/j.tsf.2010.03.004

Cited by 4 publications

(4 citation statements)

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“…Several authors recently described liquid-phase applications of microwave-induced discharges or extreme local temperatures (i.e., hot spots), in particular in the material sciences and nanomaterial research. [11][12][13][14][15][16][17][18][19][20][21][22][23] However, the influence of arcing phenomena in microwave chemistry may be more frequent than generally assumed. We suspect that in a number of published cases where zero-valent metals (or other highly electrically conductive materials) have been employed under microwave conditions, electrostatic discharges might play an important role.…”

Section: Resultsmentioning

confidence: 99%

“…In addition to liquid-phase synthetic organic chemistry applications, arcing phenomena in microwave chemistry play an important role in material sciences and nanomaterial research. For example, such effects involving highly conductive metals or metal oxides have been implicated in the formation of core/shell metal/carbon nanoparticles, 12 , 13 Fe 3 O 4 /carbon composite nanomaterials, 14 ZrB 2 or metal oxide nanostructures, 15 , 16 carbon nanotubes, 17 and metal fiber/polymer composite materials. 18 Using carbon or graphite-type materials, which are both prone to exhibit electric discharges under microwave conditions, 19 applications range from high-temperature pyrolysis reactions 20 to the high-speed formation of graphene sheets 21 and carbon nanoscrolls.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Microwave‐Induced Electric Discharge Phenomena in Metal–Solvent Mixtures

2012

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Electric discharge phenomena in metal–solvent mixtures are investigated utilizing a high field density, sealed-vessel, single-mode 2.45 GHz microwave reactor with a built-in camera. Particular emphasis is placed on studying the discharges exhibited by different metals (Mg, Zn, Cu, Fe, Ni) of varying particle sizes and morphologies in organic solvents (e.g., benzene) at different electric field strengths. Discharge phenomena for diamagnetic and paramagnetic metals (Mg, Zn, Cu) depend strongly on the size of the used particles. With small particles, short-lived corona discharges are observed that do not lead to a complete breakdown. Under high microwave power conditions or with large particles, however, bright sparks and arcs are experienced, often accompanied by solvent decomposition and formation of considerable amounts of graphitized material. Small ferromagnetic Fe and Ni powders (<40 μm) are heated very rapidly in benzene suspensions and start to glow in the microwave field, whereas larger particles exhibit extremely strong discharges. Electric discharges were also observed when Cu metal or other conductive materials such as silicon carbide were exposed to the microwave field in the absence of a solvent in an argon or nitrogen atmosphere.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of Microwave‐Induced Electric Discharge Phenomena in Metal–Solvent Mixtures

2012

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“…Briefly, 10 mg MWCNT was oxidized in a 20 mL mixture of HNO 3 and H 2 SO 4 (1:3, v/v) under sonication for 2 h. The resulting solution was filtered through a polyether sulfone filter paper (pore size of 200 nm) to remove the acids. The pH was washed using water till neutral.…”

Section: Methodsmentioning

confidence: 99%

“…Metal nanostructures have received considerable attention due to their advanced properties compared with their bulk form [1][2][3]. Many applications have been developed based on their superior properties, in areas such as biosensing, catalysis, thermal transportation, surface-enhanced Raman spectroscopy (SERS), and pollutant adsorption [4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Multi-Walled Carbon Nanotube-Assisted Electrodeposition of Silver Dendrite Coating as a Catalytic Film

Xie

Zhang

et al. 2017

Coatings

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Abstract:A multi-walled carbon nanotube (MWCNT)-coated indium tin oxide (ITO) slide was used as a platform for the growth of a silver dendrite (Ag-D) film using cyclic voltammetry. The particular dendritic nanostructures were formed by the diffusion-limited-aggregation model due to the potential difference between the MWCNTs and the ITO surface. The Ag-D-coated ITO film was then used for the catalytic degradation of methyl orange (MO) and methylene blue (MB) under static aqueous conditions. The network structure of the Ag-D allows the efficient diffusion of MO and MB, and consequently enhances the catalytic performance. Since the thin film is much easier to use for the post-treatment of powder catalysts, the proposed method shows great potential in many catalytic applications.

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Process of synthesizing high saturation magnetization Ni 0.5 Zn 0.5 Fe 2 O 4 by microwave assisted ball milling

2014

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Facile conversion of bulk metal surface to metal oxide single-crystalline nanostructures by microwave irradiation: Formation of pure or Cr-doped hematite nanostructure arrays

Cited by 4 publications

References 46 publications

Characterization of Microwave‐Induced Electric Discharge Phenomena in Metal–Solvent Mixtures

Characterization of Microwave‐Induced Electric Discharge Phenomena in Metal–Solvent Mixtures

Multi-Walled Carbon Nanotube-Assisted Electrodeposition of Silver Dendrite Coating as a Catalytic Film

Process of synthesizing high saturation magnetization Ni 0.5 Zn 0.5 Fe 2 O 4 by microwave assisted ball milling

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