Phase separated bi-metallic PtNi nanoparticles formed by pulsed laser dewetting

Ahn, Kangwoo; Lee, Su Yong; Cho, In Hwa; Kim, Yoonhee; Kang, Hyon Chol; Noh, Do Young

doi:10.1088/1361-6528/abc9e9

Cited by 3 publications

(1 citation statement)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The contact angle (θ), estimated using a simple relation, h = r (1 − cosθ), where h (102 nm) and r (150 nm) are the height and the radius of the hemisphere, respectively, was about 71.3 • , indicating that the system was in the wetting (θ < 90 • ) rather than the dewetting (θ > 90 • ) regime. This value is significantly smaller than the contact angle of noble metal NPs such as Au and Pt produced in PLID, which are usually larger than 110 • [34,42,51].…”

Section: Resultsmentioning

confidence: 85%

Nanoscale Soft Wetting Observed in Co/Sapphire during Pulsed Laser Irradiation

et al. 2021

Self Cite

View full text Add to dashboard Cite

Liquid drops on deformable soft substrates exhibit quite complicated wetting behavior as compared to those on rigid solid substrates. We report on a soft wetting behavior of Co nanoparticles (NPs) on a sapphire substrate during pulsed laser-induced dewetting (PLID). Co NPs produced by PLID wetted the sapphire substrate with a contact angle near 70°, which is in contrast to typical dewetting behavior of metal thin films exhibiting contact angles greater than 90°. In addition, a nanoscale γ-Al2O3 wetting ridge about 15 nm in size and a thin amorphous Al2O3 interlayer were observed around and beneath the Co NP, respectively. The observed soft wetting behavior strongly indicates that the sapphire substrate became soft and deformable during PLID. Moreover, the soft wetting was augmented under PLID in air due to the formation of a CoO shell, resulting in a smaller contact angle near 30°.

show abstract

Section: Resultsmentioning

confidence: 85%

Nanoscale Soft Wetting Observed in Co/Sapphire during Pulsed Laser Irradiation

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

Multimodal X-ray probe station at 9C beamline of Pohang Light Source-II

Ham

Lee

Choi

et al. 2022

J Synchrotron Radiat

Self Cite

View full text Add to dashboard Cite

In this study, the conceptual design and performance of a multimodal X-ray probe station recently installed at the 9C coherent X-ray scattering beamline of the Pohang Light Source-II are presented. The purpose of this apparatus is to measure coherent X-ray diffraction, X-ray fluorescence and electrical properties simultaneously. A miniature vacuum probe station equipped with a four-point probe was mounted on a six-axis motion hexapod. This can be used to study the structural and chemical evolution of thin films or nanostructures, as well as device performance including electronic transport properties. This probe station also provides the capability of varying sample environments such as gas atmosphere using a mass-flow-control system and sample temperatures up to 600°C using a pyrolytic boron nitride heater. The in situ annealing of ZnO thin films and the performance of ZnO nanostructure-based X-ray photodetectors are discussed. These results demonstrate that a multimodal X-ray probe station can be used for performing in situ and operando experiments to investigate structural phase transitions involving electrical resistivity switching.

show abstract

Refining laser-induced dewetting for bimetallic Au–Pd nanoparticle synthesis on ZnO thin films: Optimizing fluence for substrate integrity

Sánchez-Aké,

Segura-Zavala,

Depablos-Rivera

et al. 2024

Journal of Laser Applications

View full text Add to dashboard Cite

We report the fabrication of metal alloy Au–Pd nanoparticles on semiconductor thin film substrates (ZnO) by laser-induced dewetting. Employing a UV excimer laser, a single pulse was directed onto a three-layer film stack on a glass substrate: glass/ZnO/Au/Pd and glass/ZnO/Pd/Au. We simulated the temperature attained by the thin films enabling the prediction of energy thresholds required for melting the metal films but avoiding modifying the ZnO film. A specific range is reported of the pulse energy conducive to nanoparticle formation and the energy threshold required to modify the ZnO film beneath them. Depending on the pulse energy applied, the mean diameter of the nanoparticles varied from approximately 150 to around 70 nm. Notably, higher fluences resulted in smaller particles but also induced surface cracks in the ZnO film. Additionally, we observed a reduction in nanoparticle size with increased Pd content. Our results show that laser-induced dewetting can produce bimetallic alloy nanoparticles and, at the same time, ensure the preservation of the optical properties of the ZnO film. This approach opens avenues for tailoring material characteristics and expanding the range of applications of metal nanoparticles on semiconductor-based systems.

show abstract

Phase separated bi-metallic PtNi nanoparticles formed by pulsed laser dewetting

Cited by 3 publications

References 56 publications

Nanoscale Soft Wetting Observed in Co/Sapphire during Pulsed Laser Irradiation

Nanoscale Soft Wetting Observed in Co/Sapphire during Pulsed Laser Irradiation

Multimodal X-ray probe station at 9C beamline of Pohang Light Source-II

Refining laser-induced dewetting for bimetallic Au–Pd nanoparticle synthesis on ZnO thin films: Optimizing fluence for substrate integrity

Contact Info

Product

Resources

About