Article
Biophysics
Trang Anh Nguyen-Le, Tabea Bartsch, Robert Wodtke, Florian Brandt, Claudia Arndt, Anja Feldmann, Diana Isabel Sandoval Bojorquez, Arnau Perez Roig, Bergoi Ibarlucea, Seungho Lee, Chan-Ki Baek, Gianaurelio Cuniberti, Ralf Bergmann, Edinson Puentes-Cala, Javier Andres Soto, Biji T. Kurien, Michael Bachmann, Larysa Baraban
Summary: CAR-T cell immunotherapy is a new cancer treatment technology that involves using target modules to optimize CAR-T cell operations. In this study, silicon nanowire field-effect transistors were used to develop target modules, which showed an extremely low detection limit in binding tests. The successful redirection capability of selected peptides in the target modules was proven in an in-vitro cytotoxicity assay.
BIOSENSORS & BIOELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
He Zhu, Yun-Zhi Dai, Xiang-Chao Sun, Hong Xia
Summary: A fine H-2 sensor based on single Pd microwires (SPMs) with excellent sensing performance was reported. The sensor was prepared by femtosecond-laser-induced deposition of palladium nanoparticles (PdNPs). It has a wide detection range of H-2 sensing and exhibits two sensing mechanisms with the increase of H-2 concentration.
NANOSCALE ADVANCES
(2022)
Article
Chemistry, Multidisciplinary
Amir Ziv, Omer Shoseyov, Prajith Karadan, Brian P. Bloom, Sharone Goldring, Tzuriel Metzger, Shira Yochelis, David H. Waldeck, Roie Yerushalmi, Yossi Paltiel
Summary: A nanoscale chirality sensor has been proposed for continuously monitoring molecular chirality in real-time and for chiral recognition of small quantity samples, utilizing a gold nanofloret hybrid structure.
Article
Chemistry, Physical
Ondrej Chmela, Imrich Gablech, Jakub Sadilek, Jan Brodsky, Stella Vallejos
Summary: This study focuses on the fabrication and characterization of ChemFET gas nanosensor arrays based on single nanowire. The fabrication processes utilize micro and nanofabrication techniques enabled by a combination of ultraviolet and e-beam lithography. Results show successful integration and connection of the nanowires in the ChemFET structure using dielectrophoresis process and alignment windows. Measurements demonstrate the influence of gate bias on drain current regulation and the sensing functionality of the ChemFET arrays.
Article
Chemistry, Multidisciplinary
Zhina Razaghi, Dong Yue Xie, Ming-hui Lin, Guo-zhen Zhu
Summary: Ion beam irradiation can manipulate the composition and shape of nanowires by causing crystal defects and volume expansions. The bending effect is observed in nanowires with different diameters, but remains largely unknown in nanowires with complex shapes influenced by non-uniform irradiation. Investigating TiO2 nanowires with bead-like and prismatic shapes under a Ga+ ion beam reveals significant bending only in prismatic nanowires, which can be reversed by changing the ion beam direction. This finding suggests that ion irradiation can be used to tailor the composition and morphology of nanowires at the nanoscale.
Article
Chemistry, Multidisciplinary
Syed M. N. Hasan, Weicheng You, Arnob Ghosh, Sharif Md. Sadaf, Shamsul Arafin
Summary: This work presents the selective area epitaxy of GaN nanostructures grown on Ga-polar GaN/sapphire substrates by plasma-assisted molecular beam epitaxy. Three types of nanostructures, namely nanowires, nanofins, and nanorings, are demonstrated on GaN-on-sapphire templates, with investigation on the control of their morphology and orientation. This study advances the understanding of selective area epitaxy for defining complex III-nitride nanostructures, which are important in the fields of nanotechnology and nanoscience.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Lingyan Zheng, Ruifu Zhou, Shuwen Xin, Haofei Cong, Yuanbin Qin, Peilong Xu, Xuhai Liu, Fengyun Wang
Summary: Through the low-cost electrospinning technique, we have demonstrated artificial synaptic transistors made of multi-cation indium zinc tin oxide (IZTO) nanowires. By adjusting the ratio of indium ions in IZTO, we found that the IZTO-6 based optical synaptic devices exhibited excellent optical response with a ratio of 6 : 1 : 2. These devices showed improved long-memory retention for up to approximately three hours, with the recorded EPSC accounting for around 50% of the peak after decaying for three hours. Furthermore, Al/IZTO-6/Ni optical synaptic devices with asymmetric metal contact structures and large work function differences can simulate biological synapses without V-DS biasing, indicating their self-powering capability for future low energy-consumption in-memory computing systems.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Engineering, Electrical & Electronic
Lukang Wang, You Zhao, Yu Yang, Xing Pang, Le Hao, Yulong Zhao
Summary: This paper introduces a bulk 4H-SiC pressure sensor with controllable diaphragm thickness prepared by femtosecond laser. The sensor exhibits high sensitivity, small errors, and good dynamic response performance. The research demonstrates the potential of employing femtosecond laser technology for preparing SiC pressure sensors for extreme temperature environments.
IEEE SENSORS JOURNAL
(2022)
Article
Engineering, Chemical
Weiting Yu, Dezheng Yang, Rendan Zhu, Luzhen Liu, Yan Yu, Juntao Tang, Zhiqiao He, Jiexu Ye, Shuang Song
Summary: In this study, a catalyst with high activity and stability was successfully prepared by functionalizing the surface of the electrode with 2,6-diaminopyridine for photoassisted electrochemical CO2 reduction toward CO. The proposed synergistic mechanism facilitates the reduction of CO2 to produce CO and inhibits the competitive hydrogen evolution reaction.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Engineering, Chemical
Weiting Yu, Dezheng Yang, Rendan Zhu, Luzhen Liu, Yan Yu, Juntao Tang, Zhiqiao He, Jiexu Ye, Shuang Song
Summary: In this study, 2,6-diaminopyridine (2,6-DAP) was used for the first time to functionalize the electrode surface, resulting in a p-Si/Ag/2,6-DAP electrode with high activity and CO selectivity. The optimized potential for CO production was found to be -0.9 V vs RHE, with a Faradaic efficiency of 84.56%. A synergistic mechanism involving the reduction of CO2 by Ag and the adsorption of CO2 by 2,6-DAP was proposed to explain the enhanced catalytic performance of p-Si/Ag/2,6-DAP.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Chemistry, Physical
Tiansheng Mu, Lizhi Xiang, Xin Wan, Shuaifeng Lou, Chunyu Du, Pengjian Zuo, Geping Yin
Summary: In this study, a silicon-graphene anode with ultrahigh areal capacity was successfully fabricated using 3D printing technology. By manipulating the electrode structure, the stability and integrity of the electrode were improved, and fast electrochemical reaction kinetics were achieved. This study provides promising prospects for the commercial application of silicon anodes.
ENERGY STORAGE MATERIALS
(2022)
Article
Chemistry, Physical
Zhiheng Yang, Chenhui Qi, Wenzhe Liu, Dongbao Yin, Longjiang Yu, Lidong Li, Xuefeng Guo
Summary: The study presents a label-free real-time measurement method using silicon-nanowire-based single-molecule electrical circuits to monitor the conformational changes of the photosynthetic LH1-RC complex. The complex exhibits four different conformations with strong temperature dependence, where States 2 and 3 are the main conformations at the optimal temperature. Light activation influences the occurrence percentage, contributing to photon acquisition and heat transmission in the complex. This approach proves to be an efficient platform for revealing fundamental mechanisms of biological processes in vitro.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Maritza Mujica, Amar Mohabir, Pralav P. Shetty, Wesley R. Cline, Daniel Aziz, Matthew T. McDowell, Victor Breedveld, Sven Holger Behrens, Michael A. Filler
Summary: In this study, we demonstrate the growth of single-crystalline i-Si, i-Si/n-Si, and SixGe1-x/SiyGe1-y nanowires via the Geode process. The use of microcapsules improves scalability while maintaining programmability of the nanowires. Heat and mass transport limitations introduced by the microcapsule wall are shown to be negligible, allowing for consistent compositional control. The efficient transport also minimizes structural variations in nanowires grown in microcapsules with different sizes and wall thicknesses.
Article
Chemistry, Multidisciplinary
Sanghyeon Choi, Jingon Jang, Min Seob Kim, Nam Dong Kim, Jeehyun Kwag, Gunuk Wang
Summary: This study focuses on the implementation of a flexible neural network with probabilistic synapses as a first step towards an ultimate energy-efficient computing framework. A 16x16 crossbar array is designed and fabricated, utilizing a threshold-tunable and probabilistic SiOx memristive synaptic barristor with Si/graphene heterojunction. The suggested approach achieves significant reduction in learning energy while maintaining a high recognition accuracy.
Article
Chemistry, Multidisciplinary
K. P. Mithun, Shalini Tripathi, Ahin Roy, N. Ravishankar, A. K. Sood
Summary: We investigated carrier relaxation dynamics in semiconducting tellurium nanowires using ultrafast time-resolved terahertz spectroscopy. The relaxation process was found to exhibit bi-exponential decay with two time scales depending on the amount of capping agent on the TeNWs surface. A coupled rate equation model was used to quantitatively understand the relaxation mechanisms and the observed temperature-dependent dynamics. Furthermore, the frequency-dependent THz photoconductivity was modeled using the Boltzmann transport equation, revealing the contributions of short range and Coulomb scattering rates in the relaxation process.
Article
Nanoscience & Nanotechnology
Oliver Braun, Roman Furrer, Pascal Butti, Kishan Thodkar, Ivan Shorubalko, Ilaria Zardo, Michel Calame, Mickael L. Perrin
Summary: Mapping the thermal transport properties at the nanoscale is crucial for optimizing heat conduction in nanoscale devices. Existing methods for determining thermal conductivity provide average values, neglecting local variations. In this study, we propose a method that combines confocal Raman thermometry with finite-element calculations to spatially assess the thermal conductivity of suspended graphene. We demonstrate the effectiveness of our method by obtaining two-dimensional thermal conductivity maps of pristine and irradiated graphene. This approach opens up possibilities for studying the thermal conductivity of other layered materials, which is important for designing nanoscale thermal circuits.
NPJ 2D MATERIALS AND APPLICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Gabriela Borin Barin, Qiang Sun, Marco Di Giovannantonio, Cheng-Zhuo Du, Xiao-Ye Wang, Juan Pablo Llinas, Zafer Mutlu, Yuxuan Lin, Jan Wilhelm, Jan Overbeck, Colin Daniels, Michael Lamparski, Hafeesudeen Sahabudeen, Mickael L. Perrin, Jose Urgel, Shantanu Mishra, Amogh Kinikar, Roland Widmer, Samuel Stolz, Max Bommert, Carlo Pignedoli, Xinliang Feng, Michel Calame, Klaus Muellen, Akimitsu Narita, Vincent Meunier, Jeffrey Bokor, Roman Fasel, Pascal Ruffieux
Summary: In this study, the growth, characterization, and device integration of 5-atom wide armchair GNRs were investigated, showing potential for switching behavior at room temperature. The optimized growth protocols successfully bridge between atomic precision control of electronic properties and successful device integration of GNRs.
Article
Nanoscience & Nanotechnology
Jacopo Oswald, Davide Beretta, Michael Stiefel, Roman Furrer, Alessia Romio, Michel Daher Mansour, Dominique Vuillaume, Michel Calame
Summary: This work investigates the charge injection and transport across Au/OSC/Gr vertical heterostructures, where the PMMA-free graphene layer functions as the top electrode. The research shows that the charge transport is limited by thermionic emission at high bias and by space charge at low bias.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Optics
Matthias J. Grotevent, Sergii Yakunin, Dominik Bachmann, Carolina Romero, Javier R. Vazquez de Aldana, Matteo Madi, Michel Calame, Maksym Kovalenko, Ivan Shorubalko
Summary: This paper demonstrates a Fourier-transform waveguide spectrometer using HgTe-quantum-dot-based photoconductors, with a spectral response up to 2 μm and a spectral resolution of 50 cm(-1). The small size of the spectrometer enables its integration into consumer electronics and space devices.
Article
Chemistry, Multidisciplinary
Martin Endres, Artem Kononov, Hasitha Suriya Arachchige, Jiaqiang Yan, David Mandrus, Kenji Watanabe, Takashi Taniguchi, Christian Schoenenberger
Summary: In this study, we measured a 4N-periodic switching current through an asymmetric SQUID formed by the higher-order topological insulator WTe2. We found that a high asymmetry in critical current and negligible loop inductance alone were not sufficient to reliably measure the current-phase relation. Instead, we discovered that our measurement was heavily influenced by additional inductances originating from the self-formed PdTex inside the junction. We developed a method to numerically recover the current-phase relation and found that the 1.5 μm long junction was best described in the short ballistic limit. Our results highlight the complexity of subtle inductance effects that can lead to misleading topological signatures in transport measurements.
Article
Chemistry, Multidisciplinary
Paritosh Karnatak, Zarina Mingazheva, Kenji Watanabe, Takashi Taniguchi, Helmuth Berger, Laszlo Forro, Christian Schoenenberger
Summary: The study reveals that subgap excitations emerge on NbSe2 when MoS2 or hexagonal boron nitride (hBN) is used as the tunnel barrier. By investigating various heterostructure designs, the origin of these excitations is probed. Defect states at the edge of NbSe2 strongly couple to the superconductor, forming Andreev bound states. Moreover, the absence of subgap states in hBN tunnel barriers compared to the widespread presence in MoS2 tunnel barriers suggests defects in MoS2 as their origin. The magnetic nature of these excitations indicates a singlet- or a doublet-type ground state, emphasizing the role of strong spin-orbit coupling based on nearly vanishing g factors or avoided crossings.
Article
Chemistry, Multidisciplinary
Jacopo Oswald, Davide Beretta, Michael Stiefel, Roman Furrer, Dominique Vuillaume, Michel Calame
Summary: The effects of thermally evaporated C60 and Pentacene on the charge transport properties of CVD graphene were investigated. C60 induced a downshift of the graphene Fermi energy by about 100 meV, while Pentacene induced an upshift of about 120 meV. In both cases, the increase in charge carriers was accompanied by a reduction in charge mobility, resulting in an increased sheet resistance of graphene.
Article
Nanoscience & Nanotechnology
Jacopo Oswald, Davide Beretta, Michael Stiefel, Roman Furrer, Sebastian Lohde, Dominique Vuillaume, Michel Calame
Summary: Among the 2D materials, graphene is an ideal candidate for hybrid van der Waals heterostructures made of organic thin films and 2D materials. Understanding the charge injection mechanism at graphene/organic semiconductor interfaces is crucial for developing organic electronic devices. This study investigates the charge transport mechanism across Au/C60/Gr vertical heterostructures and discovers that the transport mechanism is injection limited at low temperature and dominated by nonideal thermionic emission at room and high temperatures.
ACS APPLIED NANO MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Lars Lueder, Peter Niraj Nirmalraj, Antonia Neels, Rene Michel Rossi, Michel Calame
Summary: Wearable sensors can provide important insight into a patient's health status by monitoring the concentration of specific biomarkers in body fluids. The integration of nanoporous metal-organic framework (MOF) particles with nitrocellulose (NC) fibrous layers using an electrospinning approach has been demonstrated, showing the efficiency of the MOF@NC structure as biosensors. The sensitivity and selectivity of this approach make it a promising platform for versatile and adaptable sensing of biomarkers.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jian Zhang, Gabriela Borin Barin, Roman Furrer, Cheng-Zhuo Du, Xiao-Ye Wang, Klaus Muellen, Pascal Ruffieux, Roman Fasel, Michel Calame, Mickael L. Perrin
Summary: Bottom-up synthesized graphene nanoribbons (GNRs) are of interest due to their atomically controlled structure and customizable physical properties. However, understanding the relationship between cryogenic charge transport and the number of GNRs in a device is challenging due to lack of precise control over GNR length and location.
Article
Chemistry, Physical
Lujun Wang, Sotirios Papadopoulos, Fadil Iyikanat, Jian Zhang, Jing Huang, Takashi Taniguchi, Kenji Watanabe, Michel Calame, Mickael L. Perrin, F. Javier Garcia de Abajo, Lukas Novotny
Summary: The authors demonstrate exciton-assisted resonant electron tunnelling in van der Waals heterostructure tunnel junctions. They reveal tunnelling mechanisms involving indirect or direct excitons and optical emission driven by inelastic electron tunnelling. The study highlights the importance of materials with well-defined interfaces and the potential for van der Waals material-based optoelectronic devices.
Article
Physics, Multidisciplinary
Christian Juenger, Sebastian Lehmann, Kimberly A. Dick, Claes Thelander, Christian Schoenenberger, Andreas Baumgartner
Summary: In this experiment, tunnel spectroscopy is used to demonstrate the hybridization of superconducting subgap states in a semiconductor nanowire with superconducting reservoirs. The intermediate states, formed by the hybridization of individual bound states through a central quantum dot, ultimately connect the reservoirs carrying a Josephson current. These hybridized Andreev bound states can be seen as superconducting analogues to atomic and molecular single electron states, and provide insights for future Majorana fusion experiments.
COMMUNICATIONS PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Michel Daher Mansour, Jacopo Oswald, Davide Beretta, Michael Stiefel, Roman Furrer, Michel Calame, Dominique Vuillaume
Summary: We studied the relationship between the structure and electron transport properties of graphene/pentacene interfaces. By using conductive atomic force microscopy (C-AFM), we measured the electron transport properties of different thicknesses of pentacene nanostructures on graphene. The energy barriers at the interfaces were determined using appropriate electron transport models and were found to be slightly larger at the graphene/pentacene interface compared to the pentacene/metal tip interface, attributing this difference to the molecular organization of the pentacene/graphene heterostructures observed from Raman spectroscopy.
Article
Chemistry, Multidisciplinary
Gabriela Borin Barin, Marco Di Giovannantonio, Thorsten G. Lohr, Shantanu Mishra, Amogh Kinikar, Mickael L. Perrin, Jan Overbeck, Michel Calame, Xinliang Feng, Roman Fasel, Pascal Ruffieux
Summary: The chemical and electronic structure of ultrashort graphene nanoribbons (GNRs) with both armchair and zigzag edges have been studied, along with their chemical reactivity in air.
Article
Materials Science, Multidisciplinary
Jian Zhang, Liu Qian, Gabriela Borin Barin, Peipei Chen, Klaus Muellen, Pascal Ruffieux, Roman Fasel, Jin Zhang, Michel Calame, Mickael L. Perrin
Summary: In this study, a double QD device based on atomically precise GNRs is presented, which can be tuned with multiple gates. The device provides a way to extract key parameters such as QD level spacing, and serves as an important foundation for studying qubits based on atomically precise GNRs.
MATERIALS FOR QUANTUM TECHNOLOGY
(2023)