Phase control for indium oxide nanoparticles

Nielsen, Ida; Sommer, Sanna; Iversen, Bo B.

doi:10.1039/d0nr08587a

Cited by 16 publications

(9 citation statements)

References 45 publications

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“…29−38 Although this phase is typically less stable than cubic In(OH) 3 , it is frequently observed during conversions of the latter to In 2 O 3 . 29,33,38,39 The presence of orthorhombic InOOH is due to the formation and growth mechanism of In(OH) 3 NCs, with the (1 0 0) [and consequently (−1 0 0)] surface of the NCs containing a component of "dehydrated" In(OH) 3 in the form of InOOH. 30 A similar situation applies to the roomtemperature synthesis of 1 described here, which gives plates of In(OH) 3 that include small crystalline domains of InOOH.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Polyoxometalate-Complexed Indium Hydroxide: Atomically Homogeneous Impregnation via Countercation Exchange

et al. 2022

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Metal hydroxides catalyze organic transformations and photochemical processes and serve as precursors for the oxide layers of functional multicomponent devices. However, no general methods are available for the preparation of stable water-soluble complexes of metal hydroxide nanocrystals (NCs) that might be more effective in catalysis and serve as versatile precursors for the reproducible fabrication of multicomponent devices. We now report that InIII-substituted monodefect Wells–Dawson (WD) polyoxometalate (POM) cluster anions, [α2-P2W17O61InIIIOH)]8–, serve as ligands for stable, water-soluble complexes, 1, of platelike, predominantly cubic-phase (dzhalindite) In(OH)3 NCs that after optimization contain ca. 10% InOOH. Images from cryogenic tranmsission electron microscopy reveal numerous WD ligands at the surfaces of platelike NCs, with average dimensions of 17 × 28 × 2 nm, each complexed by an average of ca. 450 InIII-substituted WD cluster anions and charge-balanced by 3600 Na+ countercations. Facilitated by the water solubility of 1, countercation exchange is used to stoichiometrically disperse ca. 1800 Cu2+ ions in an atomically homogeneous fashion around the surfaces of each NC core. The utility of this impregnation method is illustrated by using the ion-exchanged material as an electrocatalyst that reduces CO2 to CO 15 times faster per milligram of Cu than does K6Cu[P2CuII(H2O)W17O61] (control) alone. More generally, the findings point to POM complexation as a promising method for stabilizing and solubilizing reactive d-, p-, and f-block metal hydroxide NCs and for enabling their utilization as versatile components in the fabrication of functional multicomponent materials.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Polyoxometalate-Complexed Indium Hydroxide: Atomically Homogeneous Impregnation via Countercation Exchange

et al. 2022

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“…This is indeed the case for the related indium and aluminium oxide systems, where InOOH and AlOOH form directly during solvothermal synthesis. 22,38…”

Section: Resultsmentioning

confidence: 99%

“…This is indeed the case for the related indium and aluminium oxide systems, where InOOH and AlOOH form directly during solvothermal synthesis. 22,38 In the slow heating experiment with water and NaOH, GaOOH is the only detected phase up to 400 °C. In all other experiments at this temperature the first observed γ-Ga 2 O 3 had been transformed to β-Ga 2 O 3 .…”

Section: Gaooh and Ga 5 O 7 Ohmentioning

confidence: 99%

“…20,21 Observation of intermediates and reaction paths can contribute to understanding reaction mechanisms and optimal synthesis conditions, as previously reported for oxide systems. [22][23][24] We systematically examine the effects of the type of solvent, reaction temperatures and heating rate on the product phase as well as intermediates and reaction paths.…”

Section: Introductionmentioning

confidence: 99%

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In situ X-ray diffraction study of the solvothermal formation mechanism of gallium oxide nanoparticles

et al. 2023

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“…6,8 Indium-based nanomaterials have been synthesized via a range of techniques including solvothermal synthesis and precipitation/calcination methods. 9 The SIS of InOx(OH)y in polymethylmethacrylate (PMMA) presents a new opportunity to investigate the properties of isolated few atom InOx(OH)y clusters at the smallest-scale. Few-atom clusters may present molecular sites that are distinct from bulk metal oxide and hydroxides due to unsaturated coordination, changes in molecular symmetry and distinct hydroxylation levels.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Unique Optical and Vibrational Signatures of Sequential Infiltration Synthesis Derived Indium Oxyhydroxide Clusters for CO2 Absorption

Kunene

Martinson

2023

Preprint

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Sequential infiltration synthesis (SIS) is a vapor phase synthesis technique with potential to exert precise control over metal oxyhydroxide incorporation into polymer scaffolds. We observe strong size-dependent properties of InOx(OH)y few-atom clusters deposited with variable SIS cycle numbers within a polymethylmethacrylate (PMMA) matrix. Infrared and ultraviolet absorption spectroscopy reveal that the metal atom coordination and optical properties of the clusters depend on the number of SIS cycles performed as well as the choice of processing parameters. The incorporation of indium oxyhydroxide in PMMA via SIS improves the gravimetric CO2 absorption capacity, demonstrating a novel platform with potential for CO2 activation.

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Phase control for indium oxide nanoparticles

Abstract: The indium oxides, c-In2O3, h-In2O3, InOOH and In(OH)3, constitute an important class of wide band gap semiconductors. Synthesis of any indium oxide phase involves manoeuvring in a complex matrix of...

Cited by 16 publications

References 45 publications

Polyoxometalate-Complexed Indium Hydroxide: Atomically Homogeneous Impregnation via Countercation Exchange

Polyoxometalate-Complexed Indium Hydroxide: Atomically Homogeneous Impregnation via Countercation Exchange

In situ X-ray diffraction study of the solvothermal formation mechanism of gallium oxide nanoparticles

Understanding the Unique Optical and Vibrational Signatures of Sequential Infiltration Synthesis Derived Indium Oxyhydroxide Clusters for CO2 Absorption

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