Raman spectrum of IrO2

Huang, Ying; Lin, Senshang; Huang, C.R.; Lee, M.C.; Dann, T. E.; Chien, F. Z.

doi:10.1016/0038-1098(89)90942-3

Cited by 82 publications

(75 citation statements)

References 18 publications

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“…The three Raman-active modes, E g , B 2g and A 1g recorded in the vicinity of 561, 728 and 752 cm 1 , respectively, had their positions near those of the IrO 2 single crystal. 13 Moreover, the values of FWHM were slightly larger than those observed for the SCs. The Raman spectra observed in this work were used to confirm the formation of highquality, nearly stress free IrO 2 NCs.…”

Section: Resultsmentioning

confidence: 75%

“…The formation of IrO 2 NTs of single crystalline quality, as determined from the TEM and XRD studies, rules out the possibility of significant disorder in the crystal structure. Accordingly, the results of a 9 cm 1 redshift in the peak position (E g at 552 cm 1 ) and the larger linewidth (FWHM ¾ 28 cm 1 ) as compared with the bulk (E g at 561 cm 1 , FWHM D 12 cm 1 ) 13 should be more related to the nanoscale nature of the 1D oxide materials. 1,26 -28 Chen et al 25 also claimed that the very small contact area of NTs with the substrate ruled out any strain effect.…”

Section: Resultsmentioning

confidence: 91%

“…Group theory reveals four distinct infrared modes: one of symmetry A 2u and three of symmetry E u . 13 There are four Raman modes with symmetries A 1g , B 1g , B 2g and E g . Corresponding to each Raman-active mode, there is a scattering tensor˛with a distinct symmetry.…”

Section: Structure and Selection Rulesmentioning

confidence: 99%

“…For single crystals (SCs), the constants can be calculated by taking into account the Raman-active mode position 13 …”

Section: Structure and Selection Rulesmentioning

confidence: 99%

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Raman scattering characterization of well‐aligned RuO₂ and IrO₂ nanocrystals

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J Raman Spectroscopy

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show abstract

Section: Resultsmentioning

confidence: 75%

Section: Resultsmentioning

confidence: 91%

Section: Structure and Selection Rulesmentioning

confidence: 99%

“…For single crystals (SCs), the constants can be calculated by taking into account the Raman-active mode position 13 …”

Section: Structure and Selection Rulesmentioning

confidence: 99%

See 2 more Smart Citations

Raman scattering characterization of well‐aligned RuO₂ and IrO₂ nanocrystals

Korotcov

Huang

Tiong

et al. 2007

J Raman Spectroscopy

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show abstract

“…16 Only three modes are Raman active in the range of measurements (500-800 cm 1 ), with symmetries E g , B 2g and A 1g . 17 The forms of the scattering tensors˛, which correspond to the three Raman-active modes, in materials of the D 14 4h space group are: 17 To examine experimentally a given component˛i j , the geometry is arranged such that the incident light is polarized in the 'i' direction while only the scattered light of 'j' polarization is observed. We adopted the following notation for the various axes used in this experiment:…”

Section: Resultsmentioning

confidence: 99%

Raman scattering characterization of well‐aligned IrO₂ nanocrystals grown on sapphire substrates via reactive sputtering

Korotcov

Hsu

Huang

et al. 2006

J Raman Spectroscopy

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Raman spectroscopy (RS) was used for the characterization of well-aligned IrO 2 nanocrystals (NCs) grown on sapphire substrates with different orientations via reactive magnetron sputtering. Three Raman-active modes, E g , B 2g and A 1g , were observed in the range 500-800 cm −1 . The intensity of certain modes depended on the orientation of NCs and followed the selection rules reasonably well. The result indicates the possibility of determining the preferred growth direction of NCs using RS. Raman spectra show red shifts and peak broadening of the IrO 2 signatures with respect to those of the bulk counterpart. The red shifts and asymmetric broadening of the Raman line shapes of the NCs were analyzed by a modified spatial correlation (MSC) model, which included a factor of stress-induced shift. The MSC model showed that the effects of stress and nanometric size could be separated by analyzing the observed Raman features. The usefulness of experimental RS together with the MSC model analysis as a structural and residual stress characterization technique for NCs is demonstrated.

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Efficient OER Catalyst with Low Ir Volume Density Obtained by Homogeneous Deposition of Iridium Oxide Nanoparticles on Macroporous Antimony‐Doped Tin Oxide Support

Böhm

Beetz

Schuster

et al. 2019

Adv Funct Materials

117

105

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A multistep synthesis procedure for the homogeneous coating of a complex porous conductive oxide with small Ir nanoparticles is introduced to obtain a highly active electrocatalyst for water oxidation. At first, inverse opal macroporous Sb doped SnO 2 (ATO) microparticles with defined pore size, composition, and open-porous morphology are synthesized that reach a conductivity of ≈3.6 S cm −1 and are further used as catalyst support. ATO-supported iridium catalysts with a controlled amount of active material are prepared by solvothermal reduction of an IrO x colloid in the presence of the porous ATO particles, whereby homogeneous coating of the complete outer and inner surface of the particles with nanodispersed metallic Ir is achieved. Thermal oxidation leads to the formation of ATO-supported IrO 2 nanoparticles with a void volume fraction of ≈89% calculated for catalyst thin films based on scanning transmission electron microscope tomography data and microparticle size distribution. A remarkably low Ir bulk density of ≈0.08 g cm −3 for this supported oxide catalyst architecture with 25 wt% Ir is determined. This highly efficient oxygen evolution reaction catalyst reaches a current density of 63 A g Ir −1 at an overpotential of 300 mV versus reversible hydrogen electrode, significantly exceeding a commercial TiO 2 -supported IrO 2 reference catalyst under the same measurement conditions.

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Raman spectrum of IrO2

Cited by 82 publications

References 18 publications

Raman scattering characterization of well‐aligned RuO₂ and IrO₂ nanocrystals

Raman scattering characterization of well‐aligned RuO₂ and IrO₂ nanocrystals

Raman scattering characterization of well‐aligned IrO₂ nanocrystals grown on sapphire substrates via reactive sputtering

Efficient OER Catalyst with Low Ir Volume Density Obtained by Homogeneous Deposition of Iridium Oxide Nanoparticles on Macroporous Antimony‐Doped Tin Oxide Support

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Raman spectrum of IrO2

Cited by 82 publications

References 18 publications

Raman scattering characterization of well‐aligned RuO2 and IrO2 nanocrystals

Raman scattering characterization of well‐aligned RuO2 and IrO2 nanocrystals

Raman scattering characterization of well‐aligned IrO2 nanocrystals grown on sapphire substrates via reactive sputtering

Efficient OER Catalyst with Low Ir Volume Density Obtained by Homogeneous Deposition of Iridium Oxide Nanoparticles on Macroporous Antimony‐Doped Tin Oxide Support

Contact Info

Product

Resources

About

Raman scattering characterization of well‐aligned RuO₂ and IrO₂ nanocrystals

Raman scattering characterization of well‐aligned RuO₂ and IrO₂ nanocrystals

Raman scattering characterization of well‐aligned IrO₂ nanocrystals grown on sapphire substrates via reactive sputtering