Article
Nanoscience & Nanotechnology
Kangwoo Ahn, Su Yong Lee, In Hwa Cho, Yoonhee Kim, Hyon Chol Kang, Do Young Noh
Summary: The phase-separated Pt-Ni alloy nanoparticles formed by ns pulsed laser dewetting exhibit multiple domains including Pt3Ni, PtNi, and PtNi3 phases with different crystal orientations. This is in contrast to NPs of uniform composition obtained by thermal dewetting. A 3D electron density map of a dewetted PtNi NP obtained using coherent x-ray diffraction microscopy elucidates the 3D morphology of Pt- and Ni-rich regions along with a nano-cavity formed during pulsed laser irradiation.
Article
Materials Science, Coatings & Films
H. K. Lin, J. J. Wang, W. H. Lu, W. S. Chuang, C. Y. Chen, H. S. Chou, J. C. Huang
Summary: The study demonstrates that AgCuAl equimolar complex concentrated alloy thin films can form nanoparticles through dewetting with a NIR pulsed-laser system. These nanoparticles mainly consist of Ag and Cu, exhibit local surface plasmon resonance peaks, and their size and wavelength can be controlled by adjusting the energy density.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Linh Quy Ly, Alison Joy Fulton, Stephanie Nicole Bonvicini, Yujun Shi
Summary: This study systematically explored two different methods for dewetting of silver thin films, PLiD and TD, and found that both methods can produce silver NPs of similar size, with PLiD showing better size uniformity for thinner films. On the other hand, TD produced larger silver NPs for thicker films.
Article
Automation & Control Systems
Hsuan-Kai Lin, Ying-Chi Chen, Jia-Ren Lee, Wei-Hua Lu, Yuan-Jen Chang
Summary: This study introduced nanoparticles into pure Ag films by laser dewetting and investigated the effects of laser power, exposure time, and rotation angle on particle size and absorption spectrum.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Chemistry, Physical
Corie A. Horwood, Ebenezer Owusu-Ansah, Yujun J. Shi, Viola I. Birss
Summary: This study provides clear evidence that pulsed laser-induced dewetting of thin films of Au on Ta2O5/Ta follows the spinodal dewetting mechanism and is dependent on the surface topology of the substrate. The properties of Au nanoparticles formed on polished Ta are related to the initial Au film thickness, while those formed on chemically polished Ta remain unaffected by laser fluence or irradiation time. Thicker Au films on dimpled/patterned Ta substrates result in Au nanoparticles with a more uniform diameter and spacing, indicating an alternative dewetting mechanism.
Article
Chemistry, Physical
Jae-Hyeok Lee, Sang-Koog Kim
Summary: This work presents a novel technique for fabricating well-ordered arrays of three-dimensional partially spherical magnetic nanodots over a large area, by combining pre-patterning with e-beam lithography and short-pulsed-laser-induced dewetting of thin continuous permalloy film. Significant changes in magnetization configuration and reversal were observed between square and partially spherical dots, with the latter exhibiting a single magnetic vortex structure. This efficient method offers a reliable and cost-effective approach for large-area fabrication of highly ordered 3D nanodots.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Nanoscience & Nanotechnology
Zeyu Zheng, Yu Miao, Jiyuan Yao, Jiamei Chen, Jialin Wen, Xiaodan Chen, Yanxin Lu, Xiaofang Jiang, Lingling Shui
Summary: Hierarchical and periodic nanostructures of dielectrics or metals are fabricated using a facile and effective method. The programmable plasmonic-photonic structures demonstrate the synergistic effect of photonic and surface plasma resonance effects. This approach provides a promising path to construct pixelated plasmonic-photonic arrays for optical multiplexing technology.
Article
Chemistry, Multidisciplinary
Luminita Nicoleta Dumitrescu, Eusebiu-Rosini Ionita, Ruxandra Birjega, Andrada Lazea-Stoyanova, Maria-Daniela Ionita, George Epurescu, Ana-Maria Banici, Simona Brajnicov, Florin Andrei, Andreea Matei
Summary: This study presents the deposition of thin films of lamellar clays using laser techniques, focusing on the optimization of deposition parameters to achieve highly oriented crystalline films. The films were characterized using various techniques and different wetting properties were achieved by adjusting the deposition techniques and parameters.
Article
Polymer Science
Dong Hwan Kim, Hong Gu Kwon, Hong Kyoon Choi
Summary: In this study, dewetting-induced hierarchical patterns were successfully formed using two self-assembled materials: block copolymers and colloidal crystals. The periodic structures of colloidal crystals were used as templates to generate multi-scale hierarchical patterns with block copolymers. Various concentric ring patterns were observed and explained using a free energy model. Spiral-defective features were also examined and found to be promoted by Y-junction defects.
Article
Chemistry, Physical
Yongfeng Qian, Hu Huang, Minqiang Jiang, Jiwang Yan
Summary: Fe-based metallic glasses with micro/nano-structures were fabricated on the surface by nanosecond pulsed laser irradiation technology, resulting in distinguished microstructures such as nanoparticles and network nanostructures. The formation mechanisms of these structures were attributed to laser-induced element enrichment and diffusion and connection of nanoparticles under the combined influence of recoil pressure and surface topography.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Jing Liao, Yuhao Zhan, Qingyou Liu, Ruijin Hong, Chunxian Tao, Qi Wang, Hui Lin, Zhaoxia Han, Dawei Zhang
Summary: Al-Cu bimetallic nanoparticles thin film was fabricated by Nd:YAG fiber pulsed-laser irradiation of Al/Cu bilayers, and the effects on morphology, structure, composition, and optical properties were studied. Tunability of both localized surface plasmon resonance wavelength and intensity was achieved by adjusting the pulse shot or relative thickness of the bilayers. SEM analysis revealed that the obtained particles had a mean diameter of 36-80 nm, dependent on the Cu proportion. Surface-enhanced Raman spectroscopy measurement and FDTD simulation were used to verify the LSPR properties before and after laser irradiation.
APPLIED SURFACE SCIENCE
(2021)
Article
Optics
Min Lu, Ke Cheng, Ziyao Qin, Jiaqi Ju, Jukun Liu, Yanyan Huo
Summary: This study investigates the formations of different types of laser-induced periodic surface structures (LIPSS) on GaP crystal surfaces under different laser fluences. The transition from high spatial frequency LIPSS (HSFL) to low spatial frequency LIPSS (LSFL) is observed with an increase in the number of laser pulses. The electromagnetic approach predicts different types of ripples. The interference of the incident field and scattering field under multi-pulse irradiation is found to be the origins of HSFL and LSFL.
Article
Chemistry, Physical
T. Fix, S. Raissi, D. Muller, C. Bouillet, D. Preziosi, A. Slaoui
Summary: We attempted to grow perovskite CaTiS3 using pulsed laser deposition (PLD) on various substrates with a CaS:TiS2 target. The results showed the transfer of sulfur from the target to the film when grown in vacuum at moderate temperature. However, the desired CaTiS3 phase could not be obtained, suggesting a phase governed by van der Waals interactions. The films exhibited highly doped n-type semiconductor behavior without a surface photovoltage signal. This work should inspire further experimental efforts in PLD growth of chalcogenides and chalcogenide perovskites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Stephanie N. Bonvicini, Annie Hoang, Viola I. Birss, Sarah K. Purdy, Ramaswami Sammynaiken, Tsun-Kong Sham, Yujun Shi
Summary: The formation of Au-Pt bimetallic nanoparticles through the pulsed laser-induced dewetting of Au-Pt bilayer thin films on patterned dimpled Ta substrates was reported. The total bilayer film thickness determines the size of the nanoparticles, while the sputtering order and laser fluence have little effect on the nanoparticle size. Dimple coverage, which characterizes the formation of nanoparticle arrays, depends on the comparison of nanoparticle diameter to dimple size.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Wang Zhang, Gangyao Wen, Hongfei Li
Summary: In this study, the dewetting behavior of spin-coated poly(styrene-co-acrylonitrile) (SAN) random copolymer films was investigated for the first time. The effects of film thickness and solvent vapor annealing duration on the dewetting behavior were examined. It was found that the annealing of acetone vapor caused periodic evolutions of droplets in the SAN films due to the affinity of acetone molecules with the acrylonitrile segments and the change of surface energy.
Article
Chemistry, Physical
Humaira Taz, Rose Ruther, Abhinav Malasi, Sagar Yadavali, Connor Carr, Jagjit Nanda, Ramki Kalyanaraman
JOURNAL OF PHYSICAL CHEMISTRY C
(2015)
Article
Nanoscience & Nanotechnology
A. Malasi, R. Sachan, V. Ramos, H. Garcia, G. Duscher, R. Kalyanaraman
Article
Chemistry, Physical
Abhinav Malasi, Jingxuan Ge, Connor Carr, Hernando Garcia, Gerd Duscher, Ramki Kalyanaraman
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
(2015)
Article
Physics, Multidisciplinary
Jagjit Nanda, Surendra K. Martha, Ramki Kalyanaraman
PRAMANA-JOURNAL OF PHYSICS
(2015)
Article
Physics, Applied
A. E. Farah, R. Davidson, A. Malasi, R. C. Pooser, B. Lawrie, R. Kalyanaraman
APPLIED PHYSICS LETTERS
(2016)
Article
Nanoscience & Nanotechnology
Venkatanarayana P. Sandireddy, Krishna P. Koirala, Humaira Taz, Ramki Kalyanaraman
ACS APPLIED MATERIALS & INTERFACES
(2018)
Article
Chemistry, Multidisciplinary
Ritesh Sachan, Abhinav Malasi, Jingxuan Ge, Sagar Yadavali, Hare Krishna, Anup K. Gangopadhyay, Hernando Garcia, Gerd Duscher, Ramki Kalyanaraman
Article
Nanoscience & Nanotechnology
S. Yadavali, R. Sachan, O. Dyck, R. Kalyanaraman
Article
Chemistry, Physical
Ritesh Sachan, Abhinav Malasi, Sagar Yadavali, Blake Griffey, John Dunlap, Gerd Duscher, Ramki Kalyanaraman
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
(2015)
Article
Optics
Abhinav Malasi, Ramki Kalyanaraman, Hernando Garcia
Article
Chemistry, Multidisciplinary
Venkatanarayana P. Sandireddy, Krishna P. Koirala, Ramki Kalyanaraman
Article
Physics, Applied
Krishna Prasad Koirala, Aniruddha Deb, Sara Bey, Tatiana Allen, Ritesh Sachan, Venkatanarayana Prasad Sandireddy, Chenze Liu, Gerd Duscher, James Penner-Hahn, Ramki Kalyanaraman
Summary: Recent studies have found that amorphous oxide thin films made from Fe and lanthanides exhibit rich properties including magnetic, optical, and electronic features, as well as room-temperature magneto-electric coupling with multiferroics. These films show high disorder and slight oxidation after annealing, with high electrical conductivity, Hall mobility, and complex magnetic and optical properties at room temperature.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Krishna Prasad Koirala, Hernando Garcia, Venkatanarayana Prasad Sandireddy, Ramki Kalyanaraman, Gerd Duscher
Summary: The discovery of giant negative nonlinear refraction and nonlinear Faraday rotation at 1550 nm using Fe-Ag bimetallic nanopyramids was reported, showing a very large third-order nonlinear refractive index and magneto-optical susceptibility. This nanoscale system opens up possibilities for future miniaturization of multifunctional devices at telecommunication wavelengths.
ACS APPLIED NANO MATERIALS
(2021)
Article
Optics
A. Malasi, H. Taz, M. Ehrsam, J. Goodwin, H. Garcia, R. Kalyanaraman
Article
Physics, Applied
Venkatanarayana Prasad Sandireddy, Krishna Prasad Koirala, Gerd Duscher, Ramki Kalyanaraman
Summary: The rapid laser heating of Ag nanopyramids and thin films in different fluids demonstrates varying behaviors of material vaporization, ranging from explosive vaporization in vacuum to increased localization of vaporized material under bulk fluids. The size and density of nanoparticles on surfaces can be controlled by the vaporization behavior of metal under bounding fluids, offering insights into the highly non-equilibrium process of explosive vaporization. Additionally, the redeposited material particles show significant changes in size and density under different fluid environments, indicating the potential for tailored nanoparticle synthesis.
JOURNAL OF APPLIED PHYSICS
(2021)