Article
Nanoscience & Nanotechnology
Kensuke Kimura, Yuta Morinaga, Hiroshi Imada, Ikufumi Katayama, Kanta Asakawa, Katsumasa Yoshioka, Yousoo Kim, Jun Takeda
Summary: By coupling an intense electric field of terahertz pulse to a scanning tunneling microscope (STM) with a photon detection system, nanospectroscopic investigations of STM-induced luminescence triggered by THz-field-driven electrons were successfully demonstrated. Abundant spectral information on photons allowed separate measurement and characterization of luminescence from different sources.
Article
Nanoscience & Nanotechnology
Xinxin Zhou, Cong Guo, Zhongping Wang, Mingming Fu, Sheng Wei, Xiaoqing Liu, Sanqin Wu, Li Wang
Summary: The role of silver localized surface plasmons on the luminescence of a Si(111)-(7 x 7) surface was investigated using scanning tunneling microscopy at 77 K. It was found that the luminescence intensity from the Si surface underneath the Ag islands was significantly enhanced by about one order due to the strong coupling between the surface states of the Si and the LSPs of the Ag islands. In addition, light emission originating from the irradiation decay of the Ag plasmons was also detected during the study.
Article
Chemistry, Multidisciplinary
Jiang Yao, Peter J. Wagner, Yunpeng Xia, Gregory Czap, W. Ho
Summary: This article introduces the study of DC current generation and its connection with inelastic electron tunneling spectroscopy and microscopy. The research found that although both techniques involve nonlinear features, there are significant differences in line shape analysis, which provides two complementary techniques for probing nanoscale systems.
Article
Chemistry, Multidisciplinary
Ekaterina Podlesnaia, Andrea Csaki, Wolfgang Fritzsche
Summary: This study successfully determined the necessary reaction time for each step of synthesizing shape-anisotropic plasmonic nanoparticles like gold nanotriangles by replicating a seed-mediated synthesis method with high reproducibility. Real-time investigations elucidated the kinetics of the individual stages, leading to the optimization of the complete synthesis, reducing the synthesis time from three days to one without any loss in sample quality.
Article
Chemistry, Multidisciplinary
Anna Kuzmina, Markus Parzefall, Patrick Back, Takashi Taniguchi, Kenji Watanabe, Achint Jain, Lukas Novotny
Summary: By controlled stacking of graphene layers, the limitation of single-layer graphene as a material for light-emitting devices has been overcome, enabling twist-controlled resonant light emission. Experimental findings show light emission irrespective of the crystallographic alignment between the graphene electrodes, with a spectrally tunable resonant peak in the near-infrared range.
Article
Chemistry, Multidisciplinary
Ekaterina Podlesnaia, Princess Gerald Inangha, James Vesenka, Martin Seyring, Hans-Juergen Hempel, Markus Rettenmayr, Andrea Csaki, Wolfgang Fritzsche
Summary: Nanoparticle synthesis has received significant attention in recent decades, particularly in the study of crystal growth mechanisms and optimization of existing methods. This study reports a novel synthesis of gold nanotriangles using a micromixer, which allows for efficient mixing and simple parameter control. The impact on seed characteristics and subsequent growth steps are investigated, resulting in well-defined triangles with a narrower size distribution compared to conventional batch synthesis. Additionally, the need for a thorough study of seed crystallinity and further parameter optimization using micromixers is emphasized for scaling up nanomaterial production.
Article
Chemistry, Multidisciplinary
Chao Li, Jan Homberg, Alexander Weismann, Richard Berndt
Summary: The study reveals that AlPc molecules lose their spin moment on superconducting Pb(100) but molecular magnetism can be restored by surrounding molecules. Unlike other molecules, AlPc molecules have similar magnetic moments and lead to unusually high conductance peaks.
Article
Chemistry, Multidisciplinary
Gyeong-Su Park, Kyung Suk Min, Hyuksang Kwon, Sangwoon Yoon, Sangwon Park, Ji-Hwan Kwon, Sangmin Lee, Jaeyeon Jo, Miyoung Kim, Seong Keun Kim
Summary: Research using high spatial- and spectral-resolution mapping of LSPR modes and nanoscale strain mapping investigates the distribution of LSPR modes and the effect of defect-induced strains on properties.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Alexander Mehler, Nicolas Neel, Elena Voloshina, Yuriy Dedkov, Jorg Kroger
Summary: The study demonstrates the growth of graphene on h-BN through thermal decomposition and catalytic assistance of metal substrates, as well as the epitaxial growth of h-BN on Pt(111). Different honeycomb structures of graphene on h-BN and the observation of distinct superstructures at small probe-surface distances are highlighted in this study.
Article
Chemistry, Multidisciplinary
Kwan Ho Au-Yeung, Suchetana Sarkar, Tim Kuhne, Oumaima Aiboudi, Dmitry A. Ryndyk, Roberto Robles, Nicolas Lorente, Franziska Lissel, Christian Joachim, Francesca Moresco
Summary: Depending on its adsorption conformation, a zwitterionic single-molecule machine can act as a unidirectional rotor or a fast-drivable molecule vehicle (nanocar) on the Au(111) surface. The conformation can be selected by tuning the surface coverage. The inelastic tunneling excitation plays a role in both the rotation of the rotor and the movement of the nanocar under bias voltage pulses.
Article
Nanoscience & Nanotechnology
Yalan Ma, Olivier J. F. Martin, Andreas Stemmer
Summary: We investigated the plasmon modes of gold nanorods on a nonmetallic conductive substrate using scanning tunneling microscope-induced light emission. The radiative decay of plasmon modes on the nanorods excited by inelastic electron tunneling was identified as the far-field light. The presence of the tungsten tip with a high-dielectric constant influenced the line shapes of the plasmon spectra and enhanced the strength of the plasmon peaks.
Article
Chemistry, Multidisciplinary
Shasha Li, Ka Kit Chui, Fuhuan Shen, He Huang, Shizheng Wen, ChiYung Yam, Lei Shao, Jianbin Xu, Jianfang Wang
Summary: Excitons in a transition-metal dichalcogenide monolayer can be modulated through strain and controlled with spatial and spectral control. In this study, strain-localized excitons in a WS2 monolayer were generated and detected by covering the monolayer on individual Au nanodisks or nanorods. Enhanced emission from the strain-localized excitons was observed at room temperature, and the emission intensity and peak energy could be adjusted by the size of the nanodisks. Furthermore, the excitation and emission polarization of the strain-localized excitons could be modulated by anisotropic Au nanorods.
Article
Chemistry, Physical
Yuyi Zhang, Chengjun Liu, Xingyu Liu, Ziyu Wei, Hui Tao, Feng Xu, Lixi Wang, Jiangyong Pan, Wei Lei, Jing Chen
Summary: This research fabricates a UCD that directly converts NIR light at 1050 nm into visible light at 530 nm to investigate the working mechanism of UCDs. The simulation and experimental results confirm the existence of the quantum tunneling phenomenon in UCDs and reveal that the quantum tunneling effect can be enhanced by a localized surface plasmon.
Article
Nanoscience & Nanotechnology
Delphine Pommier, Zeilie Hufschmitt, Cheng Zhang, Yunhe Lai, Geirald Dujardin, Eric Le Moal, Christophe Sauvan, Jean-Jacques Greffet, Jianfang Wang, Elizabeth Boer-Duchemin
Summary: Quantum tunneling-driven optical nanoantennas play a vital role in the development of integrated plasmonic nanodevices. In this study, a tunneling junction between a nanoantenna and a thin gold film is used to electrically excite surface plasmons on the nanoscale. By employing an atomic force microscope, a novel method for completing the electrical circuit between the nanoantenna and the gold film is developed. Numerical modeling identifies the hybridized gap and antenna modes as the major contributors to the excitation of propagating surface plasmon polaritons.
Article
Chemistry, Multidisciplinary
Angeline S. Dileseigres, Yoann Prado, Olivier Pluchery
Summary: The functionalization of gold nanoparticles with thiol molecules in solution is crucial for their application development. In this study, the changes in localized surface plasmon resonance (LSPR) peak due to the reaction between thiol molecules and gold nanoparticles were investigated using UV-visible spectroscopy. The saturation of thiol molecules on the nanoparticle surface was confirmed, and the wavelength shift was accurately predicted using an analytical model. The kinetics of the functionalization reaction were found to be rapid, completing in less than an hour.
Article
Chemistry, Physical
Sadman Shakib, Benoit Rogez, Samira Khadir, Julien Polleux, Alois Wurger, Guillaume Baffou
Summary: Thermophoresis refers to the motion of particles along temperature gradients, which can be crucial in applications involving nano- and microscale heating. Recent studies have observed significant thermophoresis in nanoplasmonic applications and introduced a novel method for quantifying this effect.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Nanoscience & Nanotechnology
Khalid Quertite, Hanna Enriquez, Nicolas Trcera, Azzedine Bendounan, Andrew J. Mayne, Gerald Dujardin, Abdallah El Kenz, Abdelilah Benyoussef, Yannick J. Dappe, Abdelkader Kara, Hamid Oughaddou
Summary: This work investigates the electron-induced modification of NaCl thin film on Ag(110) surface. Electron beam bombardment causes desorption and formation of Cl vacancy defects on NaCl surface, which are observed using low energy electron diffraction and scanning tunneling microscopy. Auger electron spectroscopy confirms the effect of electron exposure on NaCl thin films, while density functional theory and STM simulation provide further confirmation. The presence of Cl vacancy leads to an increase in adhesion energy and charge transfer between NaCl film and Ag substrate.
Article
Materials Science, Biomaterials
Sarra Mitiche, Syrine Gueffrache, Sylvie Marguet, Jean-Frederic Audibert, Robert Bernard Pansu, Bruno Palpant
Summary: The study shows that adding a dense silica shell around gold nanoparticles can efficiently inhibit the production of reactive oxygen species, making them safer for a range of biomedical developments.
JOURNAL OF MATERIALS CHEMISTRY B
(2022)
Article
Chemistry, Multidisciplinary
Simone Assali, Anis Attiaoui, Patrick Del Vecchio, Samik Mukherjee, Jerome Nicolas, Oussama Moutanabbir
Summary: The quiet quantum environment of holes in solid-state devices is crucial for reliable quantum processors and memories. However, the lack of scalable materials has hindered the precise engineering of light-hole states. This study demonstrates a new approach to control and manipulate hole states using an all-group-IV low-dimensional system.
ADVANCED MATERIALS
(2022)
Article
Physics, Applied
Sudarshan Singh, Subhrajit Mukherjee, Samik Mukherjee, Simone Assali, Lu Luo, Samaresh Das, Oussama Moutanabbir, Samit K. Ray
Summary: A single nanowire photodetector with a high Sn-content Ge-Ge0.92Sn0.08 core-shell structure, grown by chemical vapor deposition, exhibits superior performance at the optical communication wavelength of 1.55 μm, showcasing the potential of GeSn nanowires for future Si-integrated infrared photonics.
APPLIED PHYSICS LETTERS
(2022)
Article
Multidisciplinary Sciences
Jostine Puthenveetil Joby, Suman Das, Praveenkumar Pinapati, Benoit Rogez, Guillaume Baffou, Dhermendra K. Tiwari, Sudhir Cherukulappurath
Summary: Optically-assisted large-scale assembly of nanoparticles has gained recent attention for its potential in assembling and manipulating colloidal particles and biological entities. This work presents an alternative method using graphene oxide's excellent photothermal properties to achieve non-equilibrium transport and assembly of matter. Experimental results demonstrate the rapid aggregation of silica beads using low-intensity laser illumination, attributed to optically driven thermophoretic forces.
SCIENTIFIC REPORTS
(2022)
Article
Optics
Dandan Ge, Ali Issa, Safi Jradi, Christophe Couteau, Sylvie Marguet, Renaud Bachelot
Summary: This paper demonstrates the selective immobilization of nano-emitters on gold nanocubes using a smart polymer, achieving spatial memory of specific plasmonic modes and polarization sensitivity. The ability to adjust the statistical average lifetime is also shown.
PHOTONICS RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Jerome Deumer, Brian R. Pauw, Sylvie Marguet, Dieter Skroblin, Olivier Tache, Michael Krumrey, Christian Gollwitzer
Summary: This article presents a versatile software package called CDEF, which is a Python extension used to calculate approximate scattering profiles of arbitrarily shaped nanoparticles. The software generates a quasi-randomly distributed point cloud and utilizes the open-source software DEBYER to efficiently evaluate Debye's scattering formula for small-angle X-ray scattering (SAXS). The study demonstrates that the quasi-random distribution provides faster convergence compared to a true-random distribution, especially at higher momentum transfer. The software's usability is shown through the evaluation of scattering data of Au nanocubes with rounded edges, and its accuracy is validated through comparison with analytically known form factors.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2022)
Article
Chemistry, Multidisciplinary
Anis Attiaoui, Gabriel Fettu, Samik Mukherjee, Matthias Bauer, Oussama Moutanabbir
Summary: Understanding the atomic-level properties of interfaces is crucial for optimizing device performance in semiconductor low-dimensional systems. This study demonstrates that subnanometer interfacial broadening induces localized energy states, and validates this phenomenon in heteroepitaxial structures.
Article
Nanoscience & Nanotechnology
Jun Yang, Jianzhu Li, Amin Bahrami, Noushin Nasiri, Sebastian Lehmann, Magdalena Ola Cichocka, Samik Mukherjee, Kornelius Nielsch
Summary: This work demonstrates a high-performance and self-powered photodetector that is compatible with silicon. A wide detection range from visible to near infrared light is achieved by the vertical p-n heterojunction. The photodetectors have low dark current, high responsivity, peak detectivity, and quick rise time. The devices also exhibit long-term air stability and efficient switching behavior, making them suitable for various applications in optoelectronics.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Ricardo Javier Pena Roman, Remi Bretel, Delphine Pommier, Luis Enrique Parra Lopez, Etienne Lorchat, Elizabeth Boer-Duchemin, Gerald Dujardin, Andrei G. Borisov, Luiz Fernando Zagonel, Guillaume Schull, Stephane Berciaud, Eric Le Moal
Summary: This study demonstrates the local and electrical control of photoluminescence in monolayer WS2 using a nonplasmonic tip and tunneling current of a scanning tunneling microscope. The results show that short-range photoluminescence quenching is present due to near-field electromagnetic effects, independent of the bias voltage. Additionally, a bias-voltage-dependent long-range photoluminescence quenching is observed when the sample is positively biased.
Article
Physics, Multidisciplinary
Song Jiang, Tomas Neuman, Remi Bretel, Alex Boeglin, Fabrice Scheurer, Eric Le Moal, Guillaume Schull
Summary: A scanning tunneling microscope was used to investigate the fluorescence of a charged molecule (quinacridone) adsorbed on a metallic sample covered with sodium chloride. The fluorescence from both neutral and positively charged species was observed and analyzed using hyperresolved fluorescence microscopy. A many-body model was developed based on the analysis of voltage, current, and spatial dependences of fluorescence and electron transport features. This model reveals that the charge states of quinacridone can vary transiently or permanently depending on the voltage and substrate properties.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Nicolas Feltin, Loic Crouzier, Alexandra Delvallee, Francesco Pellegrino, Valter Maurino, Dorota Bartczak, Heidi Goenaga-Infante, Olivier Tache, Sylvie Marguet, Fabienne Testard, Sebastien Artous, Francois Saint-Antonin, Christoph Salzmann, Jerome Deumer, Christian Gollwitzer, Richard Koops, Noham Sebaihi, Richard Fontanges, Matthias Neuwirth, Detlef Bergmann, Dorothee Hueser, Tobias Klein, Vasile-Dan Hodoroaba
Summary: This study aims to propose new reference certified nanomaterials to improve the reliability and traceability of nanoparticle size measurements. A comparison of different measurement techniques showed consistent results. For complexly shaped nanoparticles, the use of hybrid approaches combining multiple techniques improved the reliability of size results.
Article
Optics
Hongshi Chen, Quanbo Jiang, Ali Issa, Borui Li, Dandan Ge, Safi Jradi, Jacques Lalevee, Sylvie Marguet, Regis Deturche, Christophe Couteau, Jerome Plain, Renaud Bachelot
Summary: We report on a novel active probe for scanning near-field optical microscopy (SNOM) using a fluorescent nanosphere as a secondary source. The spatial resolution is determined by the size of the fluorescent nanosphere, and the polarization-dependent near-field images are ascribed to the local excitation rate enhancement. The measurement of the distance-dependent fluorescence lifetime provides evidence of modified local density of states, allowing extraction of additional information during near-field scanning.
Article
Materials Science, Multidisciplinary
Ricardo Javier Pena Roman, Delphine Pommier, Remi Bretel, Luis E. Parra Lopez, Etienne Lorchat, Julien Chaste, Abdelkarim Ouerghi, Severine Le Moal, Elizabeth Boer-Duchemin, Gerald Dujardin, Andrey G. Borisov, Luiz F. Zagonel, Guillaume Schull, Stephane Berciaud, Eric Le Moal
Summary: This study investigates the generation of excitons in monolayer WS2 using inelastic electron tunneling in a scanning tunneling microscope. Optical spectroscopy and Fourier-space optical microscopy reveal that the bias polarity of the tunnel junction determines the spectral and angular distribution of the emitted light.
