Particle size-dependent electrical properties of nanocrystalline NiO

Makhlouf, Salah A.; Kassem, Mohamed A.; Abdel-Rahim, M.A.

doi:10.1007/s10853-009-3457-0

Cited by 76 publications

(35 citation statements)

References 42 publications

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“…However, a small (0.16%) increase in the cell volume was observed for the sample S1 with L BET ≈ 13 nm. This result agrees with an increase of the lattice parameter in nanosized NiO, which has been found previously by x-ray diffraction [10,13] and x-ray absorption spectroscopy [14]. Note that while the widths of the structural and magnetic peaks are close in the sample S4, the broadening of the magnetic peaks occurs upon crystallites size reduction (Fig.…”

Section: Methodssupporting

confidence: 91%

Neutron scattering study of structural and magnetic size effects in NiO

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Grabis

et al. 2013

IOP Conf. Ser.: Mater. Sci. Eng.

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Section: Methodssupporting

confidence: 91%

Neutron scattering study of structural and magnetic size effects in NiO

Балагуров

Бобриков

Grabis

et al. 2013

IOP Conf. Ser.: Mater. Sci. Eng.

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“…This fact is in agreement with the overall unit cell volume expansion upon a decrease of NiO nanocrystals size observed by diffraction. 59,60 On the contrary to the second shell behavior, the average first shell R(Ni-O 1 ) distance in all nanocrystalline samples is shorter compared with microcrystalline NiO (See Fig. 4).…”

Section: Resultsmentioning

confidence: 84%

Atomic structure relaxation in nanocrystalline NiO studied by EXAFS spectroscopy: Role of nickel vacancies

et al. 2012

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Nanocrystalline NiO samples have been studied using the Ni K-edge extended x-ray absorption fine structure (EXAFS) spectroscopy and recently developed modeling technique, combining classical molecular dynamics with ab initio multiple-scattering EXAFS calculations (MD-EXAFS). Conventional analysis of the EXAFS signals from the first two coordination shells of nickel revealed that (i) the second shell average distance R(Ni-Ni2) expands in nanocrystalline NiO compared to microcrystalline NiO, in agreement with overall unit cell volume expansion observed by x-ray diffraction; (ii) on the contrary, the first shell average distance R(Ni-O1) in nanocrystalline NiO shrinks compared to microcrystalline NiO; (iii) the thermal contribution into the mean-square relative displacement σ 2 is close in both microcrystalline and nanocrystalline NiO and can be described by the Debye model; (iv) the static disorder is additionally present in nanocrystalline NiO in both the first Ni-O1 and second Ni-Ni2 shells due to nanocrystal structure relaxation. Within the MD-EXAFS method, the force-field potential models have been developed for nanosized NiO using as a criterion the agreement between the experimental and theoretical EXAFS spectra. The best solutions have been obtained for the 3D cubic-shaped nanoparticle models with nonzero Ni vacancy concentration Cvac: Cvac ≈ 0.4-1.2% for NiO nanoparticles having the cube size of L ≈ 3.6-4.2 nm and Cvac ≈ 1.6-2.0% for NiO thin film composed of cubic nano-grains with a size of L ≈ 1.3-2.1 nm. Thus, our results show that the Ni vacancies in nanosized NiO play important role in its atomic structure relaxation along with the size reduction effect.

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“…Thus, we believe that our work may assist in understanding the full potential of CuO electrodes in p-type DSSCs. 17,18 Firstly, a new and comprehensive approach for the interpretation of EIS measurements, which was validated by a thorough comparison with different devices, is described. This is compared to already known models for EIS characterization of p-type DSSCs.…”

Section: Introductionmentioning

confidence: 99%

Optimizing CuO p-type dye-sensitized solar cells by using a comprehensive electrochemical impedance spectroscopic study

et al. 2016

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aWe introduce a novel and comprehensive approach for the evaluation and interpretation of electrochemical impedance spectroscopy (EIS) measurements in p-type DSSCs. In detail, we correlate both the device performance and EIS figures-of-merit of a series of devices in which, the calcination temperature, film thickness, and electrolyte concentration have been systematically modified. This new approach enables the separation of the different processes across the dye/semiconductor/electrolyte interface, namely the unfavorable charge recombination and the favorable electron injection/regeneration processes. In addition, studies on non-sensitized CuO and NiO electrodes provide insights into their affinity towards a reaction with the electrolyte -CuO is far less reactive towards the polyiodide species. Overall, this work underlines the superior features of CuO with respect to NiO for p-DSSCs and demonstrates a comprehensive optimization of the CuO-based DSSCs with respect to the device architecture by the aid of EIS analysis.

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Particle size-dependent electrical properties of nanocrystalline NiO

Cited by 76 publications

References 42 publications

Neutron scattering study of structural and magnetic size effects in NiO

Neutron scattering study of structural and magnetic size effects in NiO

Atomic structure relaxation in nanocrystalline NiO studied by EXAFS spectroscopy: Role of nickel vacancies

Optimizing CuO p-type dye-sensitized solar cells by using a comprehensive electrochemical impedance spectroscopic study

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