Fabrication of Iron Oxide Nanoparticles via Submerged Photosynthesis and the Morphologies under Different Light Sources

Zhang, Lihua; Jeem, Melbert; Okamoto, Kazumasa; Watanabe, Seiichi

doi:10.2355/isijinternational.isijint-2019-188

Cited by 6 publications

(3 citation statements)

References 39 publications

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“…By using the submerged photosynthesis of crystallites (SPSC) method, ZnO NRs, ,, CuO NFs, and iron oxide crystallites can form on a protruded surface layer (nanobumps). The L&S patterning method is inspired by this SPSC concept, which proposes photoinduced water splitting and radical reactions are localized at protruded nanosurfaces for crystallite formation.…”

Section: Results and Discussionmentioning

confidence: 99%

Light and Shadow Effects in the Submerged Photolytic Synthesis of Micropatterned CuO Nanoflowers and ZnO Nanorods as Optoelectronic Surfaces

Mizuno

Jeem

Takahashi

et al. 2020

ACS Appl. Nano Mater.

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A facile surface patterning method using low temperature and atmospheric pressure is desirable for optoelectronic device fabrication. In this work, we demonstrate a fascinating dynamic fabrication method using light and shadow effects in submerged photolytic synthesis (L&S patterning) for CuO nanoflowers (NFs) and ZnO nanorods (NRs) surface micropatterning. In addition, galvanic reactions using appropriate metals can efficiently enhance NFs and NRs patterning. The principal of illumination effect was studied by photoelectrochemical measurements. Light induces a photoassisted localized cathodic reaction on the oxide surface through photoexcited electrons. Simultaneously, the shadowing effect from using a metal mesh prevents oxide formation, while galvanic reactions take place on the light-exposed area. This dynamic method enables facile and efficient surface patterning in water. Photoemission electron microscopy (PEEM) images and cathodoluminescence in SEM (SEM-CL) spectral analyses prove the useful electron and light emission properties of the products, respectively. A detailed discussion of their optoelectrical properties is given. The environmentally benign L&S patterning method does not require any organic catalyst to function in neutral water. Thus, this method has opened the possibility for facile, futuristic, one-pot, one-step, large-scale optoelectronic device fabrication.

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Section: Results and Discussionmentioning

confidence: 99%

Light and Shadow Effects in the Submerged Photolytic Synthesis of Micropatterned CuO Nanoflowers and ZnO Nanorods as Optoelectronic Surfaces

Mizuno

Jeem

Takahashi

et al. 2020

ACS Appl. Nano Mater.

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“…The submerged photosynthesis of crystallites (SPSC) method, first proposed by Jeem et al [30], offers a novel route for the fabrication of metal oxide materials using UV light in aqueous solution (e.g., water, H2O2 solution). So far, SPSC has proven to be useful in synthesizing a wide variety of metal oxides [31][32][33][34]. Furthermore, the SPSC method can be employed to fabricate metal oxide doping or heterojunctions for various applications [35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Submerged Photosynthesis of TiO2-CuO Hetero-nanoparticles for the Solar Photo-electrolysis of Multiple Environmental Hazardous Substances

Zhu

Zhang

et al. 2023

Preprint

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Environmental challenges have become a matter of great concern, requiring immediate attention. Agricultural pollution, such as ammonia discharge, and industrial pollution, including the abuse of organic dyes, present significant dilemmas for humanity. In response to these challenges, we propose an approach by synthesizing TiO2-CuO hetero-nanoparticles capable of degrading multiple hazardous environmental substances. Submerged photosynthesis of crystallites (SPSC) can synthesize or assist in the synthesis of metal oxides due to its simplicity and environmentally friendly nature. TiO2-CuO hetero-nanoparticles with varying Cu-Ti molar ratios were prepared, characterized, and evaluated for performance. The dispersion of CuO within TiO2 was found to be relatively uniform. Increasing the amount of added Cu resulted in an increase in CuO content until reaching the upper limit. Despite minor variations, all hetero-nanoparticle samples exhibited excellent solar light absorption performance. The simultaneous utilization of solar light illumination and electrochemical techniques synergistically enhanced the degradation process of these hazardous substances. The hetero-nanoparticle with a Cu-Ti molar ratio of 0.17 demonstrated the optimal photo-electrochemical degradation performance, exhibiting a 150% increase in degradation efficiency under solar light illumination compared to dark condition. Furthermore, it exhibited superior efficiency in the electrochemical degradation of RhB under solar light, degrading 32% more than solar light alone, and 2% more than electrochemistry alone. The mechanisms behind the fabrication and degradation processes were also discussed, elucidating the underlying principles driving the observed performance. In conclusion, our research highlights the potential of TiO2-CuO hetero-nanoparticles for solar light-assisted degradation of NH3 and RhB, showcasing their environmental applications.

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“…It was confirmed that the corrosion product was present at the corrosion site but was not found at the anticorrosion site. Although the corrosion products of iron are varied, the final product was considered to be iron hydroxide (Fe(OH) 3 ) 20 , as shown SEM observation in Fig. 2(a), XRD pattern and XPS spectra in Figs.…”

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Visualization of aquaionic splitting via iron corrosion

Murakami

Zhang

Watanabe

2020

Sci Rep

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We report a water decomposition mode called 'Aquaionic Splitting (AiS)' by means of iron corrosion in aqueous solution. in this paper, we investigated the phenomenon by controlling the reaction between iron and water. A pseudo-sacrificial protection method with oil paint was employed to select the anode and cathode formation locations that govern iron corrosion. then, the AiS reaction was visualized by using BtB solution, whose colour corresponds to pH, to produce colour patterning that corresponds to the aquaion distribution. it has become clear that water can be selectively separated into protons and hydroxide ions by corrosion control treatment. In this vein, the diffusion coefficient of protons was estimated by using the colour patterning of BtB solution that accompanies iron corrosion, and aquaion distribution was then computer simulated by solving the diffusion equation. In metal corrosion in an aqueous solution, for example, iron corrosion in water, the formation of oxides and hydroxides is accompanied by the generation of local anodes and cathodes on the surface of a base material 1-4. Simultaneously, a substantial decomposition reaction of water occurs in conjunction with the corrosion reaction. It is well known that water electrolysis generates hydrogen gas and oxygen gas by the complete decomposition of water 5 (H 2 O → H 2 + 1/2 O 2) and that the generation of and hydroxide ions from water, that is, the aquaionic splitting (AiS) (H 2 O → H + + OH −) reaction of water, takes place as a cooperative reaction. In addition, it is noteworthy that the AiS reaction occurs at an energy of 0.83 eV as calculated by HSC Chemistry software (Outokumpu Research Oy, Pori, Finland), which is lower than the energy (1.23 eV) required for the complete electrolysis of water. Accordingly, we found similarities between the water decomposition reaction of electrolysis and the AiS reaction associated with iron corrosion. Generally, it is difficult to corrode a whole piece of iron in aqua because the oxidation/reduction reaction proceeds with random formation of the anode and the cathode. However, to observe a substantial water decomposition reaction, it is necessary to clearly distinguish and control the places where the oxidation and reduction reactions occur. Anticorrosion is then expected to control the corrosion location, and the plating method, which is a sacrificial anticorrosion method, is a well-known example 6,7. We focused on sacrificial protection in the present study. However, in addition to the need for preparation of the electrolyte in the plating method 8 , there are concerns about the introduction of impurities because other metals are used 9. Therefore, we adopted a facile corrosion protection method using a conductive oil-based paint, which is expected to have a pseudo-sacrificial effect, in addition to other similar proposed methods 10,11. By controlling the corrosion areas locally, we tried to observe the AiS reaction of water accompanying iron corrosion, which is visualized by using a bromothymol blue (BT...

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Fabrication of Iron Oxide Nanoparticles via Submerged Photosynthesis and the Morphologies under Different Light Sources

Cited by 6 publications

References 39 publications

Light and Shadow Effects in the Submerged Photolytic Synthesis of Micropatterned CuO Nanoflowers and ZnO Nanorods as Optoelectronic Surfaces

Light and Shadow Effects in the Submerged Photolytic Synthesis of Micropatterned CuO Nanoflowers and ZnO Nanorods as Optoelectronic Surfaces

Submerged Photosynthesis of TiO2-CuO Hetero-nanoparticles for the Solar Photo-electrolysis of Multiple Environmental Hazardous Substances

Visualization of aquaionic splitting via iron corrosion

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