Thermodynamic understanding of phase transitions of In2O3 nanocrystals

Jiang, Xiaobao; Jiang, M.; Zhao, Mingwen

doi:10.1016/j.cplett.2013.01.071

Cited by 13 publications

(7 citation statements)

References 38 publications

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“…As the doping concentration of guest Eu is increased the adsorption enthalpy (ΔH ads ) between the guest and the host oxygen ions will also be increased. 24,53,63 For this reason, the phase transformation (including morphological transformation) barrier energy (or transition temperature) from rhombohedral to cubic becomes high after Eu doping.…”

Section: Resultsmentioning

confidence: 99%

“…The cubic phase Ĳc-In 2 O 3 ) is more stable than the rhombohedral phase Ĳrh-In 2 O 3 ) under normal conditions, and rh-In 2 O 3 exists at high temperatures and pressures. 33,36,[50][51][52][53] Many studies have focused on the synthesis of stable rh-In 2 O 3 under ambient conditions to test its potential applications as a sensor and a catalyst. [56][57][58][59][60][61] Stable rh-In 2 O 3 has been prepared by post-thermal annealing of orthorhombic InOOH, which can be synthesized by a solution method.…”

Section: Introductionmentioning

confidence: 99%

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Crystal phase transformation and doping-induced blue emission of Eu-doped InOOH and cubic/corundum-type rhombohedral In₂O₃nanowires

et al. 2015

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Crystal phase transformation and doping-induced blue emission of Eu-doped InOOH and cubic/corundum-type rhombohedral In₂O₃nanowires

et al. 2015

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“…Since both c-In 2 O 3 and h-In 2 O 3 are stable in the temperature range of the CO 2 hydrogenation to methanol reaction (200° to 300°C) (30), both may work as catalysts for this reaction. In addition, previous studies show that the thermodynamically most stable surfaces are the (110) and (111) surfaces for c-In 2 O 3 (27,(31)(32)(33)(34) and the (104) and (012) surfaces for h-In 2 O 3 (27,28,(35)(36)(37).…”

Section: Introductionmentioning

confidence: 89%

Rationally designed indium oxide catalysts for CO ₂ hydrogenation to methanol with high activity and selectivity

et al. 2020

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Renewable energy-driven methanol synthesis from CO2 and green hydrogen is a viable and key process in both the “methanol economy” and “liquid sunshine” visions. Recently, In2O3-based catalysts have shown great promise in overcoming the disadvantages of traditional Cu-based catalysts. Here, we report a successful case of theory-guided rational design of a much higher performance In2O3 nanocatalyst. Density functional theory calculations of CO2 hydrogenation pathways over stable facets of cubic and hexagonal In2O3 predict the hexagonal In2O3(104) surface to have far superior catalytic performance. This promotes the synthesis and evaluation of In2O3 in pure phases with different morphologies. Confirming our theoretical prediction, a novel hexagonal In2O3 nanomaterial with high proportion of the exposed {104} surface exhibits the highest activity and methanol selectivity with high catalytic stability. The synergy between theory and experiment proves highly effective in the rational design and experimental realization of oxide catalysts for industry-relevant reactions.

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“…Interestingly, the O 2 -annealed epi -ITO shows an almost constant E g above 600 °C. We speculate that these steady E g values above 600 °C are related to the phase transition of In 2 O 3 from a cubic bixbyite structure to a rhombohedral corundum structure 26 because the E g of corundum phase (3.8 eV) 27 is higher than bixbyite phase (2.7 eV) 11 at room temperature. However, it should be checked by high-temperature structural characterizations in future studies.…”

Section: Resultsmentioning

confidence: 88%

High-temperature optical properties of indium tin oxide thin-films

Kim

Shrestha

Souri

et al. 2020

Sci Rep

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Indium tin oxide (ITO) is one of the most widely used transparent conductors in optoelectronic device applications. We investigated the optical properties of ITO thin films at high temperatures up to 800 °C using spectroscopic ellipsometry. As temperature increases, amorphous ITO thin films undergo a phase transition at ~ 200 °C and develop polycrystalline phases with increased optical gap energies. The optical gap energies of both polycrystalline and epitaxial ITO thin films decrease with increasing temperature due to electron-phonon interactions. Depending on the background oxygen partial pressure, however, we observed that the optical gap energies exhibit reversible changes, implying that the oxidation and reduction processes occur vigorously due to the low oxidation and reduction potential energies of the ITO thin films at high temperatures. This result suggests that the electronic structure of ITO thin films strongly depends on temperature and oxygen partial pressure while they remain optically transparent, i.e., optical gap energies > 3.6 eV.

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Thermodynamic understanding of phase transitions of In2O3 nanocrystals

Cited by 13 publications

References 38 publications

Crystal phase transformation and doping-induced blue emission of Eu-doped InOOH and cubic/corundum-type rhombohedral In₂O₃nanowires

Crystal phase transformation and doping-induced blue emission of Eu-doped InOOH and cubic/corundum-type rhombohedral In₂O₃nanowires

Rationally designed indium oxide catalysts for CO ₂ hydrogenation to methanol with high activity and selectivity

High-temperature optical properties of indium tin oxide thin-films

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Thermodynamic understanding of phase transitions of In2O3 nanocrystals

Cited by 13 publications

References 38 publications

Crystal phase transformation and doping-induced blue emission of Eu-doped InOOH and cubic/corundum-type rhombohedral In2O3nanowires

Crystal phase transformation and doping-induced blue emission of Eu-doped InOOH and cubic/corundum-type rhombohedral In2O3nanowires

Rationally designed indium oxide catalysts for CO 2 hydrogenation to methanol with high activity and selectivity

High-temperature optical properties of indium tin oxide thin-films

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Product

Resources

About

Crystal phase transformation and doping-induced blue emission of Eu-doped InOOH and cubic/corundum-type rhombohedral In₂O₃nanowires

Crystal phase transformation and doping-induced blue emission of Eu-doped InOOH and cubic/corundum-type rhombohedral In₂O₃nanowires

Rationally designed indium oxide catalysts for CO ₂ hydrogenation to methanol with high activity and selectivity