Raman spectroscopy of copper oxide films deposited by reactive magnetron sputtering

Левицкий, В. С.; Шаповалов, В. М.; Komlev, A.A.; Zav’yalov, A. V.; Vitko, V. V.; Shutova, E. S.

doi:10.1134/s106378501511022x

Cited by 38 publications

(20 citation statements)

References 15 publications

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“…Therefore, the complete scalar product of two basis functions has to be computed, which requires the derivative of the inner potential. φ follows Poisson's equation (2) in which the expanded distribution…”

Section: Explicit Expansion Of the Inner Admittancementioning

confidence: 99%

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The spherical multipole resonance probe: kinetic damping in its spectrum

Oberrath¹

2020

Plasma Sources Sci. Technol.

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The multipole resonance probe is one of the recently developed measurement devices to measure plasma parameter like electron density and temperature based on the concept of active plasma resonance spectroscopy. The dynamical interaction between the probe and the plasma in electrostatic, kinetic description can be modeled in an abstract notation based on functional analytic methods.These methods provide the opportunity to derive a general solution, which is given as the response function of the probe-plasma system. It is defined by the matrix elements of the resolvent of an appropriate dynamical operator. Based on the general solution a residual damping for vanishing pressure can be predicted and can only be explained by kinetic effects. Within this manuscript an explicit response function of the multipole resonance probe is derived. Therefore, the resolvent is determined by its algebraic representation based on an expansion in orthogonal basis functions. This allows to compute an approximated response function and its corresponding spectra, which show additional damping due to kinetic effects.

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Section: Explicit Expansion Of the Inner Admittancementioning

confidence: 99%

“…Entering the basis function (19) into Poisson's equation (2) the integrals over the velocity space can be solved which yields…”

Section: Appendix A: Potential Of a Basis Functionmentioning

confidence: 99%

The spherical multipole resonance probe: kinetic damping in its spectrum

Oberrath¹

2020

Plasma Sources Sci. Technol.

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“…Entering the basis function (20) into Poisson's equation (2) the integrals over the velocity space can be solved which yields…”

Section: Appendix A: Potential Of a Basis Functionmentioning

confidence: 99%

“…Sweeping the frequency of the alternating potential, they observed a resonance phenomenon close to the electron plasma frequency ω p . Further theoretical and experimental works showed, that the resonance frequency ω r has to be below the electron plasma frequency [2,3].…”

Section: Introductionmentioning

confidence: 99%

Kinetic damping in the spectra of the spherical impedance probe

Oberrath¹

2018

Plasma Sources Sci. Technol.

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The impedance probe is a measurement device to measure plasma parameter like electron density.It consists of one electrode connected to a network analyzer via a coaxial cable and is immersed into a plasma. A bias potential superposed with an alternating potential is applied to the electrode and the response of the plasma is measured. Its dynamical interaction with the plasma in electrostatic, kinetic description can be modeled in an abstract notation based on functional analytic methods.These methods provide the opportunity to derive a general solution, which is given as the response function of the probe-plasma system. It is defined by the matrix elements of the resolvent of an appropriate dynamical operator. Based on the general solution a residual damping for vanishing pressure can be predicted and can only be explained by kinetic effects. Within this manuscript an explicit response function of the spherical impedance probe is derived. Therefore, the resolvent is determined by its algebraic representation based on an expansion in orthogonal basis functions. This allows to compute an approximated response function and its corresponding spectra. These spectra show additional damping due to kinetic effects and are in good agreement with former kinetically determined spectra.

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“…The Raman spectra of the three samples were very similar (Figure B). All the observed peaks can be assigned to Cu 2 O, which in addition to the weak T 2g peak around 515 cm −1 predicted by group theory, with forbidden bands at 109, 154, and 635 cm −1 , second order overtones at 218 and 308 cm −1 and a fourth overtone at 436 cm −1 . The breakdown of the selection rules is believed to be due to defects, non‐stoichiometry and resonant excitation .…”

Section: Resultsmentioning

confidence: 64%

Sodium‐Salt‐Promoted Growth of Self‐Supported Copper Oxides with Comparative Supercapacitive Properties

Chen

Huang

et al. 2017

ChemElectroChem

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In this work, we developed a facile hydrothermal system to synthesize self‐supported copper oxides with different nanostructures. In this system, we used copper foam as both the substrate and the copper source, and selected a wide range of sodium salts to serve as directing agents, promoting the formation of copper oxide with different nanostructures. We first show that, at 30 mM of sodium fluoride, we can successfully grow nanocubes on the copper foam substrate that comprise both CuO and Cu2O. Such a mixed composition is unique among the investigated salts. However, if a lower concentration of NaF or a different salt is used, Cu2O nanocrystals of different structures, such as nanoplatelets or irregular particles, can be obtained. When these samples were tested in supercapacitors, they demonstrated contrasting pseudocapacitive properties where the initial mixed Cu2O/CuO nanocube sample demonstrated a very stable reversible capacitance of about 400 mF cm−2 for 1600 cycles. This is significantly higher than that for the other samples, as well as advantageous compared to other copper‐oxide‐based electrode materials. The impedance analysis suggested that such a performance could be attributed to the low diffusion resistance of this sample.

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Raman spectroscopy of copper oxide films deposited by reactive magnetron sputtering

Cited by 38 publications

References 15 publications

The spherical multipole resonance probe: kinetic damping in its spectrum

The spherical multipole resonance probe: kinetic damping in its spectrum

Kinetic damping in the spectra of the spherical impedance probe

Sodium‐Salt‐Promoted Growth of Self‐Supported Copper Oxides with Comparative Supercapacitive Properties

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