New Approaches to Produce Large‐Area Single Crystal Thin Films

Kim, Geonwoo; Kim, Dongbeom; Choi, Yoon-Jung; Ghorai, Arup; Park, Gyeongbae; Jeong, Unyong

doi:10.1002/adma.202203373

Cited by 17 publications

(13 citation statements)

References 174 publications

(500 reference statements)

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“…Some reactions involving iron and nickel, such as eqs –, are thought to have occurred in this process, which is mainly due to the concentration of boric acid and lithium hydroxide in the coolant, which causes the change of pH in the local environment and the change of chemical equilibrium. − After the solubility is reached, the deposition process enters regime II. The small particle crystals reunite with each other to grow into larger crystals to achieve more stable surface energy. , Meanwhile, the continuous boiling further increases the solute concentration in the local region. Boiling also strengthens the flow of the coolant channel center to the cladding surface, so that the crystal is entrained to the cladding surface with the coolant.…”

Section: Discussionmentioning

confidence: 99%

Understanding Flow Fouling Deposition and Solute Hideout–Return Behavior at the Phase Change Interface

Liu,

Zhang

et al. 2024

ACS Appl. Mater. Interfaces

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Nuclear energy is a competitive green energy, yet corrosion deposition and boron hideout on pressurized water reactor fuel cladding surfaces could cause localized corrosion and power shift, resulting in huge safety and economic risks. Alleviation of these problems requires the understanding of the corrosion deposition mechanism and related boron behavior. In this study, we explore corrosion product deposition in typical fuel assembly channels under subcooled boiling conditions and propose a boron hideout and return mechanism to explain the reason for the failure of the power reduction inhibiting a power shift. Porous corrosion depositions with the same morphology and thickness as the real depositions in a fuel cycle are obtained in a week via the accelerated deposition method simulating a real subcooled boiling and water chemical environment. Stronger subcooled boiling generates more bubbles, resulting in higher supersaturation of corrosion products at the gas−liquid interface. The corresponding precipitated stable crystals are smaller, and the formed deposition layer is looser and thicker with smaller particles. On the basis of the above characterizations, the effect of subcooled boiling, solute concentration, and water chemistry on the corrosion deposition mechanism is revealed. High-resolution characterization methods indicate that boron hides within the depositions mainly in the form of H 3 BO 3 and Li 2 B 4 O 7 . The boron coolant concentration increases by 307.9 ppm after power reduction, confirming the return behavior of porous hidden boron. Hidden boron return behavior brings potential challenges for estimating critical conditions and plant response operations. The results of this study provide a precise method for understanding the corrosion product deposition and boron hideout−return behavior to further develop mitigation strategies for power shift and localized corrosion security issues.

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Section: Discussionmentioning

confidence: 99%

Understanding Flow Fouling Deposition and Solute Hideout–Return Behavior at the Phase Change Interface

Liu,

Zhang

et al. 2024

ACS Appl. Mater. Interfaces

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“…[22] However, the high reflectivity of the metal persists in the visible spectrum, making Au coatings unsuitable for broadband camouflage applications. [23] To make a transparent (visible) yet reflective (IR) film layer, the film thickness must be controlled to be far less than the penetration depth (𝛿) of the material at visible wavelengths [6,8] which is not trivial with arbitrary target surfaces [24] First, to obtain continuous metal films with high reflectivity, the metal deposition thickness greater than the percolation threshold thickness (t p ) is usually required, which is determined by the dewetting behavior of metals on various surfaces. [25] However, metal atoms evaporated onto a substrate whose lattice mismatches that of the metal exhibit island-type growth, increasing t p up to the thickness comparable to 𝛿 of the metal at visible wavelengths.…”

Section: Introductionmentioning

confidence: 99%

Ultrathin Metal Film on Graphene for Percolation‐Threshold‐Limited Thermal Emissivity Control

et al. 2023

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Translucent Au/graphene hybrid films are shown to be effective in reducing thermal emission from the underlying surfaces when the deposition thickness of Au is close to the percolation threshold. The critical Au deposition thickness for an abrupt change in emissivity is reduced from 15 nm (Si substrate) to a percolation‐threshold‐limited thickness of 8.5 nm (graphene/Si substrate) because of the chemical inertness of graphene leading to the deposited Au atoms forming a thin, crystalline layer. The effect of the graphene layer on the optical properties of the hybrid film is highlighted by a drastic increase in infrared absorptivity, whereas the visible absorptivity is marginally affected by the presence of a graphene layer. The level of thermal emission from the Au/graphene hybrid films with the percolation‐threshold‐limited Au thickness is stable even with high background temperatures of up to 300 °C and mechanical strains of ≈4%. As an example of a thermal management application, an anti‐counterfeiting device is demonstrated; thermal‐camouflage‐masked text fabricated with an Au/graphene hybrid film is discernible only using a thermographic camera. Ultrathin metal film assisted by a graphene layer will provide a facile platform for thermal management with semi‐transparency, flexibility, and transferability to arbitrary surfaces.

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“…However, the robust THE around room temperature in large‐area homogeneous films is still insufficient considering the practical industrial applications based on chiral spin textures. [ 52 ]…”

Section: Introductionmentioning

confidence: 99%

“…However, the robust THE around room temperature in large-area homogeneous films is still insufficient considering the practical industrial applications based on chiral spin textures. [52] In this work, we report a colossal intrinsic THE at high temperatures in large-area Cr 5 Te 6 single-crystalline films grown by pulsed laser deposition (PLD). Its Curie temperature (T C ) is as large as 320 K. The THE resistivity is observed up to 1.6 µΩ cm at 90 K, which is the largest magnitude in the Cr x Te y family.…”

Section: Introductionmentioning

confidence: 99%

Observation of Colossal Topological Hall Effect in Noncoplanar Ferromagnet Cr₅Te₆ Thin Films

Chen

Zhu

Lin

et al. 2023

Adv Funct Materials

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The topological Hall effect (THE) is critical to the exploration of the spin chirality generated by the real‐space Berry curvature, which has attracted worldwide attention for its prospective applications in spintronic devices. However, the prominent THE remains elusive at room temperature, which severely restricts the practical integration of chiral spin textures. Here, a colossal intrinsic THE is showed up to ≈1.6 µΩ cm in large‐area ferromagnet Cr5Te6 thin films epitaxially grown by pulsed laser deposition. Such a THE can be maintained until 270 K, which is attributed to the field‐stimulated noncoplanar spin textures induced by the interaction of the in‐plane ferromagnet and antiferromagnet infrastructures. The first‐principles calculations further verify the considerable Dzyaloshinskii‐Moriya interaction in Cr5Te6. This work not only paves the way for robust chiral spin textures near room temperature in large‐area low‐dimensional ferromagnetic films for practical applications, but also facilitates the development of high‐density and dissipationless spintronic devices.

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New Approaches to Produce Large‐Area Single Crystal Thin Films

Cited by 17 publications

References 174 publications

Understanding Flow Fouling Deposition and Solute Hideout–Return Behavior at the Phase Change Interface

Understanding Flow Fouling Deposition and Solute Hideout–Return Behavior at the Phase Change Interface

Ultrathin Metal Film on Graphene for Percolation‐Threshold‐Limited Thermal Emissivity Control

Observation of Colossal Topological Hall Effect in Noncoplanar Ferromagnet Cr₅Te₆ Thin Films

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New Approaches to Produce Large‐Area Single Crystal Thin Films

Cited by 17 publications

References 174 publications

Understanding Flow Fouling Deposition and Solute Hideout–Return Behavior at the Phase Change Interface

Understanding Flow Fouling Deposition and Solute Hideout–Return Behavior at the Phase Change Interface

Ultrathin Metal Film on Graphene for Percolation‐Threshold‐Limited Thermal Emissivity Control

Observation of Colossal Topological Hall Effect in Noncoplanar Ferromagnet Cr5Te6 Thin Films

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Observation of Colossal Topological Hall Effect in Noncoplanar Ferromagnet Cr₅Te₆ Thin Films