Synthesis and characterization of V2O3 nanorods

Santulli, Alexander C.; Xu, Wenqian; Parise, John B.; Wu, Lijun; Aronson, M. C.; Zhang, Fen; Nam, Chang‐Yong; Black, Charles T.; Tiano, Amanda L.; Wong, Stanislaus S.

doi:10.1039/b822902c

Cited by 37 publications

(38 citation statements)

References 75 publications

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“…2. The ZFC-FC hysteresis eect is seen from ∼ 50 to 145 K and magnetic transition from the AFM to PM state is seen at T t = 144 K. The value of T t is in line with those reported for the insulator-metal transition of V 2 O 3 powders (nanowires, nanocrystals), namely, if a light non-stoichiometry is considered [3,4]. Moreover, the magnetization curves observed at temperatures of T = 10300 K were linear and non-hysteretic.…”

Section: Methodssupporting

confidence: 75%

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Magnetic Properties of V_{2}O_{3} Nanooxide Prepared Mechanochemically With and Without Salt Matrix

et al. 2014

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Section: Methodssupporting

confidence: 75%

“…ZFC curves were tted by the Curie-Weiss law, χ = C/(T −Θ) and values of the Curie constant C, Weiss temperature Θ and eective magnetic moment µ ef f were estimated. 3. Results and discussion Figure 1a shows the XRD patterns of the starting V 2 O 5 /Na 2 SO 3 mixture with the molar ratio of 1:2.5.…”

Section: Methodsmentioning

confidence: 99%

Magnetic Properties of V_{2}O_{3} Nanooxide Prepared Mechanochemically With and Without Salt Matrix

et al. 2014

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“…This result is consistent with the experimentally observed gap recently reported in the literature for similar wires by one of our groups. 45 In addition, analysis of as-synthesized V 2 O 3 nanowires via nanoAuger electron spectroscopy demonstrated a larger O (514 eV): V (437 eV) peak ratio than expected for bulk, suggesting that the oxygen content is higher at the surfaces of the nanowires.…”

Section: Resultsmentioning

confidence: 99%

“…45 First, an aqueous solution of V 2 O 5 is mixed with KOH and hydrazine, followed by a pH adjustment to ~ 3 by dropwise addition of HCl. The reaction mixture is hydrothermally treated at 150°C for 48 hours, producing VO 2 nanorods.…”

Section: Surface Experimental Verification Of Theoretical Resultsmentioning

confidence: 99%

Effects of electronic correlation, physical structure, and surface termination on the electronic structure of V2O3nanowires

Tiano

Sutter

et al. 2012

Phys. Rev. B

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We report a density functional theory (DFT) study of the electronic structure of V 2 O 3 in both bulk and nanowire form. In particular, our study is focused on the role of spin polarization and electronic correlations, as computed within the local (spin) density approximation (L(S)DA) and the LDA+U formalism. As expected for a mean-field approach such as DFT, our optimized bulk V 2 O 3 structure is shown to be metallic in nature, while an adequate choice of the Hubbard U parameter (U = 4 eV) is enough to open the band gap, making the system insulating. However, this formalism predicts a non-magnetic insulator, as opposed to the experimentally observed anti-ferromagnetic structure, to be the ground state. The electronic structure nature of the V 2 O 3 nanowire system is much more complex, and it is strongly dependent on the surface termination of the structures. Our results show that non-spin polarized LDA calculations of <001> grown nanowires are metallic in nature. However, LSDA predicts some surface terminations to be halfmetals, with a large band gap opening for one of the spins. When LSDA+U was used to study the nanowire model with a closed-shell oxygen surface termination, we observe insulating behavior with no net magnetic moment, with a 104 meV band gap. This is consistent with the experimentally observed gap recently reported in the literature for similar wires. To experimentally address the surface structure of these nanowires, we perform surface specific nano-Auger electron spectroscopy (AES) on as-synthesized V 2 O 3 nanowires. Our experimental results show a higher O: V peak ratio (1.93: 1) than expected for pure V 2 O 3 , thereby suggesting a higher oxygen content at the surface of the nanowires. From our results, we conclude that oxygen termination is likely the termination for our as-synthesized V 2 O 3 nanowires.

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“…[34] Moreover, V 2 O 3 nanotubes have been fabricated through the H 2 -mediated reduction of a V 2 O 5 nanoscroll precursor obtained hydrothermally from an aged suspension of V 2 O 5 and dodecylamine. [35] To the best of our knowledge, no reports are available on 3D nanostructured V 2 O 3 constructs with good electrochemical performance to be used as electrode material for rechargeable lithium batteries and pesudocapacitors.…”

Section: Introductionmentioning

confidence: 99%

Flowerlike Vanadium Sesquioxide: Solvothermal Preparation and Electrochemical Properties

Liu

Wang

et al. 2010

ChemPhysChem

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A novel 3D hierarchical flowerlike vanadium sesquioxide (V(2)O(3)) nano/microarchitecture consisting of numerous nanoflakes is prepared via a solvothermal approach followed by an appropriate heating treatment. The as-obtained nanostructured V(2)O(3) flower is characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) analysis, and transmission electron microscopy (TEM) (or/and high-resolution TEM, HRTEM), and it is found that the V(2)O(3) flower is constructed by single-crystalline nanoflakes. Furthermore, it is demonstrated that the surface of the flowerlike V(2)O(3) material is composed of nanostructured pores, which derive from the adsorption/desorption of nitrogen, and that the pore-size distribution depends on the unique three-dimensional interconnection between nanoflakes and on their intrinsic properties. The electrochemical behavior of the V(2)O(3) flower for lithium-ion insertion/extraction in non-aqueous solution as well as the faradaic capacitance for pesudocapacitors in a neutral aqueous solution are also investigated. A reversible discharge capacity as high as 325 mA h g(-1) is obtained at a current density of 0.02 A g(-1) from a LiClO(4)/EC:DEC electrolyte solution (i.e. LiClO(4) in ethyl carbonate and diethyl carbonate). When used as the cathode material of pesudocapacitors in Li(2)SO(4), the flowerlike oxide displayed a very high initial capacitance of 218 F g(-1) at a current density of 0.05 A g(-1). We believe that the good performance of the flowerlike V(2)O(3) electrode is most probably due to its unique 3D hierarchical nano/microarchitecture, which shows that the electrochemical properties of a cathodic material do not only depend on the oxidation state of that material but also-to a large extent-on its crystalline structure and morphology. The aforementioned properties suggest that the present V(2)O(3) flower materials may have a great potential to be employed as electrode materials in rechargeable lithium batteries and pesudocapacitors.

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Synthesis and characterization of V2O3 nanorods

Cited by 37 publications

References 75 publications

Magnetic Properties of V_{2}O_{3} Nanooxide Prepared Mechanochemically With and Without Salt Matrix

Magnetic Properties of V_{2}O_{3} Nanooxide Prepared Mechanochemically With and Without Salt Matrix

Effects of electronic correlation, physical structure, and surface termination on the electronic structure of V2O3nanowires

Flowerlike Vanadium Sesquioxide: Solvothermal Preparation and Electrochemical Properties

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