Article
Chemistry, Multidisciplinary
Issam Kherbouche, Danielle MacRae, Theo Geronimi Jourdain, Francois Lagugne-Labarthet, Azedine Lamouri, Alexandre Chevillot Biraud, Claire Mangeney, Nordin Felidj
Summary: Plasmonic excitation of metallic nanoparticles can trigger chemical reactions at the nanoscale; selectively grafting aryl films from diazonium salts on single gold nanotriangles was demonstrated; the approach may pave the way for spatially controlled surface functionalization of plasmonic nanoparticles.
Article
Nanoscience & Nanotechnology
Jayakumar Pillanagrovi, Shourya Dutta-Gupta
Summary: This study presents a strategy to assemble gold nanoparticles in resonant gold nanoapertures for coupling-mediated near-field enhancement. The assembled AuNP-NA substrates showed improved SERS potential compared to bare NA templates, and numerical simulations indicated the importance of coupling between plasmonic modes for this enhancement.
Article
Biophysics
Hongki Lee, Woo Joong Rhee, Gwiyeong Moon, Seongmin Im, Taehwang Son, Jeon-Soo Shin, Donghyun Kim
Summary: The report focuses on plasmon-enhanced imaging fluorescence correlation spectroscopy, utilizing nanogap-based plasmonic nanodimer arrays for improved signal-to-noise ratio and precision. The study confirms the enhancement effect of PNAs and investigates lysosomes diffusion dynamics, potentially serving as a powerful analytical tool for exploring subcellular dynamics in the future.
BIOSENSORS & BIOELECTRONICS
(2021)
Article
Multidisciplinary Sciences
Tuerkan Bayrak, Amanda Martinez-Reyes, David Daniel Ruiz Arce, Jeffrey Kelling, Enrique C. Samano, Artur Erbe
Summary: A method based on directed molecular self-assembly was introduced to manufacture and electrically characterise C-shape gold nanowires, revealing hopping, thermionic, and tunneling transports indicating weakly coupled metallic segments along the wires.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Multidisciplinary
Wang Li, Ke Sun, Lisong Yang, Xi Mao, Shuai Deng, Hui Jiang, Pan Gu, Bowen Cao, Wen Li, Mingdong Yi, Colin D. D. Bain, Renhua Deng, Jintao Zhu
Summary: This study provides a solution to the challenge of in situ fabrication of macroscale ordered nanoparticle monolayers on targeted substrates by developing a colloidal ink formulation and employing the direct-ink-writing (DIW) technique. The ordered monolayer, consisting of polystyrene-grafted gold nanoparticles (Au@PS NPs) embedded in a PS thin film, is deposited through on-demand ink delivery and directional evaporation. The approach allows for fine control of NP self-assembly and shows enhanced performance compared to a disordered NP film prepared by spin coating, making it promising for various applications including electronic and optical devices.
Article
Nanoscience & Nanotechnology
Lei Xu, Youran Hong, Jiangwei Wang, Langli Luo
Summary: Nanoscale solid-state transformations of metals and alloys during electrochemical processes play a critical role in various applications such as corrosion, electrochemical machining, and alkali metal batteries. Using in situ transmission electron microscopy, a unique phase transformation of Ag nanowire alloyed with Li was demonstrated, featuring a surface reaction of electrochemical lithiation of Ag followed by a fast redistribution of Ag into small nanoparticles embedded in Li2O.
SCRIPTA MATERIALIA
(2021)
Article
Nanoscience & Nanotechnology
Irati Alonso Calafell, Lee A. Rozema, David Alcaraz Iranzo, Alessandro Trenti, Philipp K. Jenke, Joel D. Cox, Avinash Kumar, Hlib Bieliaiev, Sebastien Nanot, Cheng Peng, Dmitri K. Efetov, Jin-Yong Hong, Jing Kong, Dirk R. Englund, F. Javier Garcia de Abajo, Frank H. L. Koppens, Philip Walther
Summary: Graphene-insulator-metal heterostructures exhibit significantly enhanced optical nonlinearity, offering potential for optically controlled and electrically tunable nano-optoelectronic devices.
NATURE NANOTECHNOLOGY
(2021)
Article
Chemistry, Analytical
Chenhuinan Wei, Zhuo Wang, Yimo Xiao, Fan Du, Ziyang Yu, Huihu Wang, Qiming Liu
Summary: In this study, novel three-dimensional hybrids based on Au and Cu2O were successfully synthesized. The Au/Cu2O nanowire arrays exhibited high catalytic activity, excellent selectivity, stability, and reproducibility in glucose electro-oxidation reactions. The sensor also demonstrated the capability for quantitative detection of glucose levels in diluted human serum.
Article
Materials Science, Characterization & Testing
Wera Di Cianni, Maria de la Mata, Francisco J. Delgado, Jesus Hernandez-Saz, Miriam Herrera, Sergio I. Molina, Michele Giocondo, Alberto Sanz de Leon
Summary: Nanocomposites containing gold nanoparticles (AuNPs) were prepared by stereolithography with the addition of a gold precursor. The resin and AuNPs were polymerized and formed independently, allowing optimization of the processes separately. Advanced electron microscopy revealed the distribution and morphology of the AuNPs, which were influenced by the precursor concentration and thermal treatments. The AuNPs' localized surface plasmon resonance modified the optical properties of the 3D-printed nanocomposites, enabling the design of advanced plasmonic platforms for surface-enhanced Raman spectroscopy (SERS).
Article
Biochemistry & Molecular Biology
Saltanat B. Ikramova, Zhandos N. Utegulov, Kadyrjan K. Dikhanbayev, Abduzhappar E. Gaipov, Renata R. Nemkayeva, Valery G. Yakunin, Vladimir P. Savinov, Victor Yu Timoshenko
Summary: This study explored the use of silicon nanowires (SiNWs) combined with gold nanoparticles (Au NPs) for surface-enhanced Raman scattering (SERS) of probe molecules. The research found that the filling factor of SiNW arrays controlled the SERS efficiency, with the highest enhancement observed for samples with a porosity of 55%. The results demonstrate the electromagnetic enhancement of SERS through localized surface plasmon resonances in Au-NPs on SiNW surfaces, accompanied by light scattering in the SiNW arrays.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Chemistry, Physical
Tiantian Dai, Zanhong Deng, Xiaodong Fang, Huadong Lu, Yong He, Junqing Chang, Shimao Wang, Nengwei Zhu, Liang Li, Gang Meng
Summary: By controlling the use of shadow masks and the thickness of the copper film, the position and spacing of CuO microhemisphere nanowires can be well controlled, allowing for bridging of adjacent nanowires and benefiting highly sensitive TMA sensors and broad band photodetectors. The electrical response of 3.62 to 100 ppm TMA is comparable to state-of-the-art CuO-based sensors, suggesting promising commercial device applications of CuO nanowires through in situ assembly of RB-MNAs device arrays using common lithographic technologies.
Article
Chemistry, Multidisciplinary
Kateryna Trofymchuk, Karol Kolataj, Viktorija Glembockyte, Fangjia Zhu, Guillermo P. Acuna, Tim Liedl, Philip Tinnefeld
Summary: DNA origami has become a leading technology for organizing materials at the nanoscale, particularly for manipulating light using plasmonic nanoparticles. In this study, gold nanorods were arranged in a plasmonic nanoantenna dimer, resulting in a 1600-fold enhancement of fluorescence from a conventional near-infrared dye located at the plasmonic hotspot between the nanorods. Various characterization techniques and numerical simulations provided insights into the heterogeneity of the observed enhancement values. The use of a recently introduced design called NAnoantenna with Cleared HotSpot (NACHOS) enabled the creation of a hotspot region with a size of approximately 12 nm, which allows for the incorporation of tailored bioassays. The possibility of synthesizing nanoantennas in solution opens the potential for large-scale production.
Article
Chemistry, Physical
Thomas S. Heiderscheit, Shunpei Oikawa, Stephen Sanders, Hiro Minamimoto, Emily K. Searles, Christy F. Landes, Kei Murakoshi, Alejandro Manjavacas, Stephan Link
Summary: Electrogenerated chemiluminescence (ECL) microscopy is a promising technique for mapping chemical reactions on single nanoparticles. By coupling ECL dyes with plasmonic nanoparticles, such as hexagonal arrays of gold nanodisks, signal intensity can be significantly improved. Varying the lattice spacing of these nanoparticles can result in a 23-fold enhancement of ECL intensity due to increased dye-array near-field coupling.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Physical
Fan Wang, Xuanxuan Feng, Na Wang, Hongxin Guan, Shaokang Bian, Xianfeng Hao, Yan Chen
Summary: Nickel-based nanowire arrays with varying cobalt content were prepared using a modified electrodeposition method for hydrogen evolution reaction. The experimental results showed that nanowire arrays with a nickel-cobalt atomic ratio of 32:1 exhibited superior performance, and density functional theory calculations confirmed that materials doped with 1Co had better electrocatalytic activity.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Multidisciplinary Sciences
Bichlien H. Nguyen, Christopher N. Takahashi, Gagan Gupta, Jake A. Smith, Richard Rouse, Paul Berndt, Sergey Yekhanin, David P. Ward, Siena D. Ang, Patrick Garvan, Hsing-Yeh Parker, Rob Carlson, Douglas Carmean, Luis Ceze, Karin Strauss
Summary: Synthetic DNA is an attractive medium for long-term data storage due to its density, ease of copying, sustainability, and longevity. Developments in encoding algorithms, automation, preservation, and sequencing technologies have been made, but the challenge lies in the limited write throughput. The development of a nanoscale DNA storage writer promises significant improvements in DNA write density and throughput, enabling practical DNA data storage systems.
Article
Chemistry, Physical
Akira Yasuhara, Takumi Sannomiya
Summary: Metallic nanoparticles, especially those alloyed with multiple metal elements, have been widely studied for their unique electrical, optical, and catalytic properties. Interfaces between different phases and grain boundaries play a significant role in determining the catalytic efficiency and chemical stability of the alloy nanoparticles. In this study, Au-Ag-Cu ternary alloy nanoparticles were synthesized and their atomically localized structures, particularly at the grain boundaries, were investigated. The findings provide insights into the interface structure of these nanoparticles.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
John Andersson, Justas Svirelis, Gustav Ferrand-Drake del Castillo, Takumi Sannomiya, Andreas Dahlin
Summary: This study demonstrates the use of 20 nm Pd and Pt films for quantitative SPR sensing of organic films, despite their high light absorption. The Pd sensors show similarities to 50 nm gold in sensitivity and field extension, while Pt sensors have a longer extension of the evanescent field but higher noise levels. The findings highlight the advantages of SPR for studying chemical modifications of important metals in various contexts.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Dung Thi Vu, Nikolaos Matthaiakakis, Hikaru Saito, Takumi Sannomiya
Summary: In this study, the emission modes of single molybdenum disulfide nanoflakes were experimentally visualized using cathodoluminescence. Dielectric resonances were found to enhance the luminescence of the nanoflakes. The coupling of exciton and dielectric resonant modes was observed through theoretical simulations and experiments.
Article
Chemistry, Multidisciplinary
Jose C. Mateus, Sean Weaver, Dirk van Swaay, Aline F. Renz, Julian Hengsteler, Paulo Aguiar, Janos Voeroes
Summary: This research utilizes electron beam lithography and photolithography to create microstructures that control neuronal connectivity, and demonstrates the formation of functional synapses in vitro.
Article
Biophysics
Stephan J. Ihle, Sophie Girardin, Thomas Felder, Tobias Ruff, Julian Hengsteler, Jens Duru, Sean Weaver, Csaba Forro, Janos Voros
Summary: We present a paradigm to examine the behavior of multiple neuronal networks with controlled topology in vitro. Our approach enables simultaneous electrical stimulation and recording of neuronal activity from 60 independent networks over multiple weeks. We found that the network response pattern to a stimulus remains stable for at least 12 hours and continuous stimulation does not significantly change the stimulation-induced mean spiking frequency of a circuit. We also investigated the effect of stimulation amplitude and timing on the network response and demonstrated the capability of our setup to apply complex stimulation protocols.
BIOSENSORS & BIOELECTRONICS
(2022)
Article
Chemistry, Analytical
Lukas Schmidheini, Raphael F. Tiefenauer, Volker Gatterdam, Andreas Frutiger, Takumi Sannomiya, Morteza Aramesh
Summary: By combining nanodiamonds with gold nanoparticles through DNA hybridization, a hybrid system is created which allows for fluorescence emission in nanodiamonds induced by harmonic emission in gold nanoparticles. The stochastic emission fluctuations can be utilized for potential applications in super-resolution microscopy, making it significant for intracellular biosensing and bioimaging.
Article
Nanoscience & Nanotechnology
Akira Yasuhara, Masahiro Homma, Takumi Sannomiya
Summary: Metallic nanoparticles with localized surface plasmon resonance have suitable optical properties for various applications, and the phase-separated Janus nanoparticles can be formed at high temperatures to tune the optical properties and metastructures of the nanoparticles.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Jean-Marc Von Mentlen, Jasper Clarysse, Annina Moser, Dhananjeya Kumaar, Olesya Yarema, Takumi Sannomiya, Maksym Yarema, Vanessa Wood
Summary: This article presents an easy method to reliably engineer thin Ga2O3 shells on Au nanoparticles. With the liquid-phase chemical oxidation of Au-Ga alloy nanoparticles, laminar and ultrathin Ga2O3 shells can be grown. The reaction process and Ga2O3 shell growth can be monitored using localized surface plasmon resonance.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Taeko Matsukata, Shintaro Ogura, Javier Garcia de Abajo, Takumi Sannomiya
Summary: Free-electron-based spectroscopies can reveal nanoscale optical properties of semiconductor materials and nanophotonic devices. A cathodoluminescence method is demonstrated that can access both excitation and emission spaces at the nanoscale, providing valuable information on previously inaccessible nanoscale optical properties.
Article
Materials Science, Multidisciplinary
Dung Thi Vu, Nikolaos Matthaiakakis, Takumi Sannomiya
Summary: A significant enhancement of the A- and B-exciton emission in MoS2 flakes through coupling with plasmonic Au nano-pyramid arrays fabricated by a colloidal lithography technique is reported in this study. The local emission enhancement from the structure is experimentally mapped with a nanometer spatial resolution by cathodoluminescence (CL) technique. The strongly enhanced emission intensity within the MoS2-Au pyramids is achieved due to the localized surface plasmon resonance confined in nano-pyramids and its interaction with the periodicity-based resonance of the array structure. These results provide an approach to significantly improve the luminescence intensity of MoS2 through optical interaction with the local plasmonic field, which is promising for applications in optoelectronic devices and nanophotonics.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Izzah Machfuudzoh, Tatsuki Hinamoto, F. Javier Garcia de Abajo, Hiroshi Sugimoto, Minoru Fujii, Takumi Sannomiya
Summary: This study fills the research gap in direct imaging of optical modes by demonstrating nanoscale optical-field visualization of self-interference of light extracted from excited modes through experimentally obtained photon maps that directly portray the field distributions of the excited eigenmodes. By selectively choosing specific modes using cathodoluminescence-based scanning transmission electron microscopy with angle-, polarization-, and wavelength-resolved capabilities, the internal field distributions of the whispering-gallery modes reveal the interference between multiple modes and the resulting complex patterns dependent on the detection angle and polarization. The direct visualization of internal fields enables a comprehensive understanding of WGMs and can provide insights for the design of nanophotonic applications.
Article
Biophysics
Jens Duru, Benedikt Maurer, Ciara Giles Doran, Robert Jelitto, Joel Kuchler, Stephan J. Ihle, Tobias Ruff, Robert John, Barbara Genocchi, Janos Voros
Summary: This article presents a bottom-up neuroscience approach using engineered biological neural networks to study neuronal activity. The researchers establish a platform with up to six independent networks formed by rat neurons on microelectrode arrays. They demonstrate that continuous application of a repetitive super-threshold stimulus generates a reproducible network response within a 15 ms post-stimulus window, which can be tracked with high spatiotemporal resolution across the entire network.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Microscopy
Yoshikazu Adachi, Naoki Yamamoto, Takumi Sannomiya
Summary: We developed a novel light optics system for a scanning transmission electron microscope (STEM) that accurately introduces a focused light at the electron beam irradiation position using a parabolic mirror. The position and focus of the light beam can be evaluated by imaging the angular distribution of the transmitted light. This system allows for investigating optical spectra in comparison with cathodoluminescence (CL) spectra at exactly the same location.
Article
Materials Science, Multidisciplinary
Tatsuro Yuge, Naoki Yamamoto, Takumi Sannomiya, Keiichirou Akiba
Summary: We propose a theoretical model for cathodoluminescence (CL) based on a master equation. The model describes the excitation of multiple emitters by an incoming electron and the decay of individual emitters. We investigate the second-order correlation function, g(2)(r), and derive exact and approximate formulas for different scenarios. Moreover, we discuss the radiation field state of CL and reveal the existence of a state resulting from a mixture of excited photon state and vacuum state, leading to superbunching.
Article
Biochemical Research Methods
Sophie Girardin, Blandine Clement, Stephan J. Ihle, Sean Weaver, Jana B. Petr, Jose C. Mateus, Jens Duru, Csaba Forro, Tobias Ruff, Isabelle Fruh, Matthias Mueller, Janos Voeroes, Magdalena
Summary: Building small and controlled circuits of human induced pluripotent stem cell-derived neurons holds great promise in understanding the fundamental principles of information processing and storing in the brain.
