Article
Optics
Rahul A. Rajan, Chi-Vinh Ngo, J. Yang, Yu Liu, K. S. Rao, Chunlei Guo
Summary: This study utilized femtosecond and picosecond lasers to create superhydrophilic surfaces and investigated their morphologies and surface chemistry. Due to significant variations in micro-nano structure and molecular compositions, surfaces fabricated by the two lasers showed notable differences in surface wettability. Furthermore, applying an eco-friendly coating on ultrafast laser fabricated surfaces can maintain superhydrophilic properties for over 14 months.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Mingyu Li, Jifei Ye, Lan Li, Bangdeng Du, Ying Wang, Heyan Gao, Chenghao Yu
Summary: Large-spot laser ablation with a one-dimensional supply mode was proposed and experimentally verified. The results showed that femtosecond laser multipulse ablation resulted in grain refinement in copper and better quality craters in both metals. Picosecond laser multipulse ablation caused a dense remelting bulge in nickel, affecting laser absorption. Nickel had larger heat-affected zones compared to copper, whereas copper had deeper ablation depth and higher quality.
Article
Chemistry, Physical
Saurabh Awasthi, Bin Gong, Alex Fuerbach, Christopher E. Marjo, Deb M. Kane
Summary: ToF-SIMS is a sensitive technique used to investigate chemical composition at or near the surface of a material, particularly detecting elements present in extremely low quantities. This study utilized ToF-SIMS to determine changes in element distribution at a muscovite surface caused by laser irradiation, showing an enrichment of sodium and potassium. Furthermore, ToF-SIMS revealed differences in elemental makeup between ejected and redeposited nanoparticulates.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Shu-Zhou Qu, Yi-Xin Zhao, Hao-Sen Kang, Jing-Wen Zou, Liang Ma, Si-Jing Ding, Xiang-Bai Chen
Summary: In this study, a new SERS substrate material based on ultrathin MXene and rough-surfaced Au nanotriangles was successfully prepared, which can significantly enhance the electromagnetic signal and charge transfer effect, thereby improving the sensitivity and performance of organic molecule detection. By tuning the surface roughness and plasmon resonance, the SERS performance can be further enhanced. This study provides a new insight into the development of high-performance SERS substrates based on plasmon.
Article
Optics
Sunderlal Singh Sanasam, G. l. Samuel
Summary: This paper reports on the application of femtosecond laser for modifying surface wettability without significant chemical modification, by tuning the surface morphology. The study shows the ability to achieve both hydrophilicity and hydrophobicity.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Chemistry, Physical
Tong Zhou, Sebastian Kraft, Walter Perrie, Jorg Schille, Udo Loeschner, Stuart Edwardson, Geoff Dearden
Summary: This study reports novel observations of directed re-deposition of ablation debris during ultrafast laser micro-structuring of stainless steel, showcasing the potential of controlled modification of debris morphology by adjusting energy density and beam parameters. Patterns of debris re-deposition between spots are likely associated with interactions of colliding shock waves and plasma, highlighting the complex mechanisms involved in the formation of sub-micron surface structures.
Article
Physics, Applied
A. Nakhoul, A. Rudenko, X. Sedao, N. Peillon, J. P. Colombier, C. Maurice, G. Blanc, A. Borbely, N. Faure, G. Kermouche
Summary: By controlling the ultrafast laser's energy density and pulse duration, the surface of aluminum-based alloys can be modified effectively, resulting in desirable peening effects such as compressive residual stress, hardness, and surface roughness. The increase in dislocation density indicates plastic deformation, which enhances hardness and surface quality.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
A. Andreev, J. Imgrunt, V. Braun, I. Dittmar, U. Teubner
Summary: The study investigated the formation of laser-induced periodic surface structures on polished thick copper targets using femtosecond Ti:sapphire laser pulses. The dependence of ripple period and height on different fluences and laser shot numbers was examined, with experimental results analyzed and interpreted based on theoretical models. The research aims to enhance particle emission in high-intensity femtosecond-laser matter interaction experiments through the generation of nanostructures on metal surfaces.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Jason M. Gross, Seyedeh Reyhaneh Shavandi, Teodora Zagorac, Michael J. Pasterski, Luke Hanley
Summary: This study compares the effects of nanosecond laser ablation and femtosecond laser ablation on silicon. It is found that nanosecond laser ablation produces more visible nanostructures, while femtosecond laser ablation creates protruding nanostructures and conical craters.
JOURNAL OF LASER APPLICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Jackeline Soto-Cruz, Paolo Conejo-Valverde, Giovanni Saenz-Arce, Hongjing Dou, Oscar Rojas-Carrillo
Summary: In this study, negatively charged liposomes were utilized as both a reducing and stabilizing agent in the synthesis of gold nanotriangles. Through a combined centrifugation and depletion flocculation strategy, the sample was successfully purified to obtain negatively charged GNTs, which show potential for various applications in the future.
Article
Physics, Multidisciplinary
Soumitra Hazra, Neeti Gupta, Gavin Conibeer, Santosh Shrestha, R. N. Kini
Summary: Using picosecond ultrasonic technique, the study investigated the impact of nanocrystallites formation on the surface of a metal transducer film, revealing enhanced sound velocity and elastic constant due to the nanocrystalline structures, leading to modification in the shape of the acoustic echo resulting from the reflection of the acoustic pulse at the surface, obtaining an echo with an asymmetric bipolar shape. The shape of the acoustic echo can be explained by considering the formation of nanocrystallites at the film's surface.
Review
Biochemistry & Molecular Biology
Xiaoxi Yu, Zhengkang Wang, Handan Cui, Xiaofei Wu, Wenjing Chai, Jinjian Wei, Yuqin Chen, Zhide Zhang
Summary: Gold nanotriangles (AuNTs) have unique optical and plasmonic properties, making them promising for applications in optoelectronics, optical sensing, imaging, and other fields. This review comprehensively discusses the synthesis and self-assembly of AuNTs, as well as their specific surface modification and assembly into different nano- or microstructures. The advantages and disadvantages of various synthesis strategies are compared, and potential applications in chemical biology and sensing are explored. The future development of AuNTs is also prospected.
Article
Optics
Simin Zhang, Michael Tripepi, Abdallah AlShafey, Noah Talisa, Hoang T. Nguyen, Brendan A. Reagan, Emily Sistrunk, David J. Gibson, David A. Alessi, Enam A. Chowdhury
Summary: MLD gratings suitable for compression of high-energy pulses at 2 micron wavelength for the BAT laser have been developed and tested, with damage thresholds found between 100-230 mJ/cm(2). Damage sites display blister formation at lower fluences and ablation of the grating pillars at higher fluences, as shown in atomic force microscope images.
Article
Chemistry, Physical
Bo Zhao, Xin Zheng, Yuhao Lei, Hongbo Xie, Tingting Zou, Gan Yuan, Wei Xin, Jianjun Yang
Summary: Femtosecond laser-induced periodic surface structures, achieved through double temporally delayed blue femtosecond lasers, offer a new prospect for high precision manufacture. The homogeneous large-area nanolithography on molybdenum surface shows improved structure uniformity and quality, making it suitable for applications in nanooptics.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Analytical
Shimayali Kaushal, Anil Kumar, Sanjeev Soni, Nitin Kumar Singhal
Summary: A hybrid antibody biosensor based on graphene oxide-coated gold nanoparticles was developed for fast, specific, and high sensitivity foodborne bacterial detection. The biosensor showed colorimetric and spectrophotometric changes up to 10(3) and 10(2) CFU, respectively, when incubated with Escherichia coli and Salmonella typhimurium for 5 minutes. Immobilized antibodies on the hybrid nanoparticle biosensor were specific to bacteria and exhibited specific photoablation of bacteria upon infrared exposure. This antibody-functionalized biosensor allowed for rapid optical detection and extermination of foodborne bacteria.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Multidisciplinary
Tomoya Oshikiri, Haruki Jo, Xu Shi, Hiroaki Misawa
Summary: This study utilized the concept of modal strong coupling between metal nanoparticles and a nanocavity to enhance the efficiency of hot-hole injection. The results showed that the hybrid modes of the modal strong coupling system promoted hot-hole injection and proton/water reduction by hot electrons over a broad wavelength range.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Yusuke Ueda, Yusuke Masuda, Tomohiro Iwai, Keisuke Imaeda, Hiroki Takeuchi, Kosei Ueno, Min Gao, Jun-ya Hasegawa, Masaya Sawamura
Summary: We present a copper-catalyzed enantioselective umpolung allylic acylation reaction under visible light. The reaction involves the use of acylsilanes as acyl anion equivalents and is supported by triplet-quenching experiments and DFT calculations. The reaction mechanism involves a charge-separated triplet state intermediate generated by copper-to-acyl metal-to-ligand charge transfer photoexcitation.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Hiroki Ago, Susumu Okada, Yasumitsu Miyata, Kazunari Matsuda, Mikito Koshino, Kosei Ueno, Kosuke Nagashio
Summary: The past decades of materials science discoveries have laid the foundation for our present society. The recent discovery of graphene and other 2D materials offers a novel approach to synthesizing materials and exploring new physics and chemistry.
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
(2022)
Article
Physics, Multidisciplinary
Stefan Reich, Yannis Kluegl, Anna Ziefuss, Rene Streubel, Joerg Goettlicher, Anton Plech
Summary: In this study, in situ experimental methods were employed to investigate mass flow and chemical speciation during pulsed laser ablation of zinc in water. The results revealed that the ablated particles are captured and retracted towards the target, and oxidation does not occur during the bubble phase and subsequent sub-millisecond time scale. The study also found that the intensity of the laser fluence exhibits a threshold behavior in terms of plasma intensity and bubble size.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2022)
Article
Chemistry, Multidisciplinary
Chiaki Kojima, Akemi Noguchi, Tatsuya Nagai, Ken-ichi Yuyama, Sho Fujii, Kosei Ueno, Nobuaki Oyamada, Kei Murakoshi, Tatsuya Shoji, Yasuyuki Tsuboi
Summary: Membrane fusion is an important and ubiquitous process in living organisms. This study developed a novel method for liposome fusion based on laser-induced bubble generation on gold surfaces, creating ultralong tubes similar to sea anemones. The behavior of the tubes was monitored using fluorescence microscopy, and the generation of these tubes was discussed in relation to Marangoni convection and thermophoresis.
Article
Multidisciplinary Sciences
Pedro Paulo Ferreira da Rosa, Yuichi Kitagawa, Sunao Shoji, Hironaga Oyama, Keisuke Imaeda, Naofumi Nakayama, Koji Fushimi, Hidehiro Uekusa, Kosei Ueno, Hitoshi Goto, Yasuchika Hasegawa
Summary: Soft-crystal copolymerization of Tb(III) and Dy(III) complexes is achieved, and long-range energy transfer from one crystal to the other is studied.
NATURE COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Anton Plech, Anna R. Ziefuss, Matteo Levantino, Rene Streubel, Stefan Reich, Sven Reichenberger
Summary: This paper investigates the effects and mechanisms of laser excitation on gold nanoparticles and finds that the energy uptake efficiency of gold nanoparticles is significantly reduced at on-resonant excitation with 532nm compared to interband excitation with 400nm. The lower heating efficiency is related to ultrafast plasmon bleaching and its recovery, as well as a significant residual dissipation channel in the case of on-resonant excitation.
Article
Thermodynamics
Mira Simmler, Manuel Meier, Luisa Rank, Gernot Buth, Anton Plech, Hermann Nirschl
Summary: A sophisticated technique using small angle X-ray scattering (SAXS) was developed to investigate the particle formation mechanism of zirconia nanoparticles in a turbulent spray flame. The measurements revealed a significant dependence of scattering intensity as a function of height above the burner. Detailed analysis of the SAXS data and comparison with TEM images provided insights into primary particle growth, fractal properties, and aggregation process.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Chemistry, Multidisciplinary
Yaguang Wang, Xu Shi, Tomoya Oshikiri, Hiroaki Misawa
Summary: We fabricated a novel photoanode structure that efficiently enhances light absorption and electron transfer through modal strong coupling, enabling water splitting at zero bias potential.
NANOSCALE ADVANCES
(2022)
Article
Nanoscience & Nanotechnology
Baerbel Krause, Gregory Abadias, David Babonneau, Anny Michel, Andrea Resta, Alessandro Coati, Yves Garreau, Alina Vlad, Anton Plech, Peter Wochner, Tilo Baumbach
Summary: Ohmic or Schottky contacts in micro- and nano-electronic devices are formed by metal-semiconductor bilayer systems. The structure formation of these contacts is not yet fully understood and their control of electronic properties remains challenging. This study investigates the phase and microstructure evolution during the deposition and annealing of Pd/a-Ge bilayer systems. Real-time X-ray diffraction and other complementary methods are used to monitor the deposition process and analyze the formation of different layers. The findings provide insights into the formation of metal/semiconductor contacts and offer new possibilities for their knowledge-based formation.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Xiaoqian Zang, Xu Shi, Yoshiki Suganami, Yen-En Liu, Tomoya Oshikiri, Hiroaki Misawa
Summary: In this study, a strong coupling photoelectrode with localized surface plasmon resonance (LSPR) and Fabry-Perot (FP) nanocavity was fabricated to investigate the enhancement mechanism of plasmon-induced chemical reactions. The efficient water oxidation on the strong coupling electrode was considered a result of quantum coherence between the Au-Ag alloy nanoparticles through the nanocavity. In situ electrochemical surface-enhanced Raman spectroscopy was used to detect the intermediates of water oxidation and showed a more negative onset potential on the strong coupling electrode.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Chih-Hao Huang, Ya-Chiao Lee, Tetsuhiro Kudo, Xu Shi, Kosei Ueno, Teruki Sugiyama, Hiroaki Misawa, Hiroshi Masuhara
Summary: In this study, optical trapping with fabricated gold nanodisk arrangement was used to observe the trapping and arrangement of gold nanoparticles between the nanodisks, as well as the bidirectional and unidirectional swarming behavior of the nanoparticles. These findings provide valuable insights into optical manipulation techniques coupled with fabricated nanostructures, expanding the possibilities for optical trapping and related research.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Bhagyashree Mahesha Sachith, Zhijing Zhang, Palyam Subramanyam, Challapalli Subrahmanyam, Akihiro Furube, Naoto Tamai, Takuya Okamoto, Hiroaki Misawa, Vasudevanpillai Biju
Summary: Bandgap-engineered inorganic and hybrid halide perovskite materials have shown great promise for solar cells, but fluctuations in the photoinduced electron transfer (PET) rates can affect their performance. In this study, we investigated the fluctuations of interfacial PET in perovskite-based donor-acceptor systems at both single-particle and ensemble levels. By analyzing the Gibbs free energy changes and studying the dynamics of PET, we gained insights into the charge separation mechanisms in these systems. Our findings provide valuable information for optimizing the design and performance of perovskite solar cells.
Article
Materials Science, Multidisciplinary
Margarita Zakharova, Andrey Mikhaylov, Stefan Reich, Anton Plech, Danays Kunka
Summary: In this study, we quantitatively investigated the submicron structure in the bulk of porous graphite using dark-field x-ray imaging with Hartmann masks. By scanning the correlation length and measuring the mask visibility reduction, we obtained various parameters of the structure and revealed the anisotropy of pore sizes using the dimensional properties of the masks.
