Article
Engineering, Electrical & Electronic
Eusebiu Ilarian Ionete, Alina Elena Niculescu, Stefan Ionut Spiridon, Bogdan Florian Monea
Summary: Experimental investigation of magnetoresistance behavior of cryogenic temperature sensors based on different chiralities of SWCNTs was conducted, resulting in the derivation of magnetoresistance expression and coefficients based on experimental data, as well as explanation for the electrical resistance dependence on temperature below 80K. The hopping dimension values for systems composed of purified (7,6) chirality SWCNTs and unsorted SWCNTs were found to be 2.67 and 2.97, respectively, in good agreement with theory.
IEEE SENSORS JOURNAL
(2021)
Article
Chemistry, Physical
Hai-Ning Zhang, Yin Fan, Hui-Shen Shen
Summary: This study analyzed the engineering Poisson's ratio (EPR) and incremental Poisson's ratio (IPR) of single-walled carbon nanotubes (SWCNTs) with different chiral angles and investigated the effect of chirality on rigidity. It was found that SWCNTs with different chiral angles exhibited different mechanical properties in terms of EPR and IPR in tension, compression, longitudinal, and radial directions. The critical strain for auxeticity was also found to be chirality-dependent. Additionally, a method for explaining the negative IPR phenomenon was proposed based on the contribution to radial strain.
Article
Chemistry, Physical
Peter R. Schol, Wen-Shan Zhang, Tobias Scharl, Andreas Kunzmann, Wolfgang Peukert, Rasmus R. Schroeder, Dirk M. Guldi
Summary: A common goal in renewable energy research is to add matching additives to semiconductor layers in order to achieve desired effects and advantages. In this study, a twofold approach was demonstrated: adjusting the band gap of the semiconductor layer by incorporating indium into zinc oxide, and improving charge transport capabilities by adding single-walled carbon nanotubes. The results showed that both additives had positive effects on the cell performance of dye-sensitized solar cells.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Hongjie Zhang, Wenhuai Zhuge, Feng Yang, Lixing Kang, Shuchen Zhang, Ran Du, Jinjie Qian, Zhi Yang, Yagang Yao, Pan Li, Yue Hu, Jin Zhang
Summary: The article introduces a temperature-mediated method to achieve high-density and specific diameter SWNT arrays. This method can increase the density of the array and control the diameter by reactivating poisoned catalysts to continue the growth of SWNTs. This provides a possibility for the integration of SWNTs into nanodevices.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Review
Energy & Fuels
Jin-Myung Choi, Jiye Han, Tushar Rane, Soyeon Kim, Ick Soo Kim, Il Jeon
Summary: This review discusses the fundamentals of utilizing SWCNTs in PSCs, including their characteristics as electron-transporting layer, hole-transporting layer, photoactive layer, and interfacial materials. It also presents strategies to improve PSCs performance through defect control and enhancement of electrical and morphological properties.
JOURNAL OF PHYSICS-ENERGY
(2022)
Article
Chemistry, Multidisciplinary
Cordelia Zimmerer, Frank Simon, Sascha Putzke, Astrid Drechsler, Andreas Janke, Beate Krause
Summary: This study presents a bio-inspired, environmentally friendly technique for metallization of single-walled carbon nanotubes (SWCNTs) using polydopamine (PDA) as an adhesion promoter and electroless plating with nickel. The results showed that prior oxidation of SWCNTs significantly improved the distribution of PDA and nickel. The PDA layer acted as a p-dopant, increasing the Seebeck coefficient of SWCNTs. However, the subsequent metallization decreased the Seebeck coefficient, indicating a need for further optimization.
Article
Materials Science, Multidisciplinary
W. M. Moslem, A. S. El-Said, R. E. Tolba, H. Bahlouli
Summary: Ion beam technology is efficiently used to modify the properties of nanomaterials. This study focuses on the structural modifications of carbon nanotubes using highly energetic heavy ions. The irradiation with high ion fluence induces significant topographic changes along the nanotubes. A hydrodynamic fluid model is introduced to explain the observed results by investigating the ion-induced plasma. The calculations show a qualitative coincidence between the evolution of the periodic electric potential and the observed broken nanostructured segments along the nanotube.
RESULTS IN PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Masaru Irita, Takahiro Yamamoto, Yoshikazu Homma
Summary: The study used photoluminescence spectroscopy to directly measure the chirality distributions of individual semiconducting SWCNTs, confirming the influence of chiral angles on the growth yield. When higher-yield chiralities are selected, the chiral angle distribution fits well with a model that incorporates the thermodynamic effect. These quantitative and statistical data provide new insights into the SWCNT growth mechanism and validate theoretical predictions.
Article
Materials Science, Multidisciplinary
Nan Zhou, Yue Sun, Q. Hou, T. Sakakibara, X. Z. Xing, C. Q. Xu, C. Y. Xi, Z. S. Wang, Y. F. Zhang, Y. Q. Pan, B. Chen, X. Luo, Y. P. Sun, Xiaofeng Xu, T. Tamegai, Mingxiang Xu, Zhixiang Shi
Summary: In this study, torque magnetometry was used to investigate the angle-resolved in-plane and out-of-plane magnetic torque for high-quality FeSe1,Sx single crystals. A fourfold torque signal was observed when the magnetic field was within the ab plane, which was interpreted as intrinsic pinning due to the combined effects of gap nodes/minimum and twin domains. Additionally, the observed out-of-plane torque peaks were attributed to intrinsic pinning caused by the layered structure.
MATERIALS TODAY PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Timofei Eremin, Valentina Eremina, Yuri Svirko, Petr Obraztsov
Summary: Covalent functionalization of single-walled carbon nanotubes (SWCNTs) can greatly enhance their photoluminescent (PL) brightness, making them suitable for infrared light emitters.
Article
Chemistry, Multidisciplinary
Dewu Lin, Yue Yu, Lanying Li, Mingzhi Zou, Jin Zhang
Summary: The article describes a method for synthesizing high-purity semiconducting single-walled carbon nanotube arrays using a bicomponent catalyst of Au and ZrO2, which creates a localized etching zone to improve the purity and performance of carbon nanotubes.
Article
Chemistry, Multidisciplinary
Min-Ken Li, Adnan Riaz, Martina Wederhake, Karin Fink, Avishek Saha, Simone Dehm, Xiaowei He, Friedrich Schoeppler, Manfred M. Kappes, Han Htoon, Valentin N. Popov, Stephen K. Doom, Tobias Hertel, Frank Hennrich, Ralph Krupke
Summary: This work demonstrates that electroluminescence excitation is selective towards neutral defect-state configurations with the lowest transition energy, which, combined with gate control, leads to high spectral purity.
Article
Chemistry, Multidisciplinary
Sophia Komrakova, Pavel An, Vadim Kovalyuk, Alexander Golikov, Yury Gladush, Aram Mkrtchyan, Dmitry Chermoshentsev, Dmitry Krasnikov, Albert Nasibulin, Gregory Goltsman
Summary: The potential of aerosol-synthesized single-walled carbon nanotube (SWCNT) films for silicon nitride photonic circuits is investigated in this study as a basis for developing integrated optics devices. By measuring the optical response of SWCNT-covered waveguides, the main SWCNT film parameters, such as absorption, nonlinear refractive, and thermo-optic coefficients, are retrieved, and the enhancement of all-optical wavelength conversion and the photoresponse with a 1.2 GHz bandwidth are demonstrated.
Article
Nanoscience & Nanotechnology
Sophia Zanoni, Brennan P. Watts, Kevin Tvrdy
Summary: Despite the commercial availability of many different hydrogel formulations, the effective gel-based purification of single-walled carbon nanotubes (SWNT) remains exclusive to Sephacryl S-200. In this study, various commercially available gels and custom-synthesized gels were investigated for their ability to purify SWNT, with findings showing that different gels exhibit unique SWNT chiral selectivity and physiochemical properties. Superose 6 was found to adsorb more SWNT than Sephacryl S-200 and exhibit a unique preference for specific SWNT chiralities, providing insights into the rational design of gels for SWNT purification.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
A. Melnikov, P. P. Kuzhir, S. A. Maksimenko, G. Y. Slepyan, A. Boag, O. Pulci, I. A. Shelykh, M. Shuba
Summary: The scattering theory for two crossing metallic single-walled carbon nanotubes of finite length exposed to an electromagnetic field has been developed, incorporating the influence of the contact conductance, position, and angle between tube axes on the tube polarizability. The physical mechanisms responsible for the electromagnetic interaction between crossing tubes with zero and nonzero intertube contact conductance have been discussed, along with the demonstrated influence of coupling between the tubes on their localized plasmon resonance.
Article
Physics, Applied
Masafumi Shimasaki, Taishi Nishihara, Naoki Wada, Zheng Liu, Kazunari Matsuda, Yasumitsu Miyata, Yuhei Miyauchi
Summary: We demonstrate anisotropic exciton drift-diffusion in a WS2x Se(2-2x) alloy monolayer with a gradually changing exciton energy caused by the spatial variation in the chalcogen composition ratio. The photoluminescence (PL) images under isotropic laser excitation are extended toward the lower exciton energy side. Moreover, the degree of asymmetry in the PL image increases at the positions with a steep exciton energy gradient. The anisotropy in the PL images and its correlation with the exciton energy gradient are reproduced considering the exciton kinetics obeying a drift-diffusion equation.
APPLIED PHYSICS EXPRESS
(2023)
Article
Chemistry, Multidisciplinary
Aritz Landart-Gereka, Maria Mar Quesada-Moreno, Maria A. Palacios, Ismael F. Diaz-Ortega, Hiroyuki Nojiri, Mykhaylo Ozerov, J. Krzystek, Enrique Colacio
Summary: Replaced pyridine with 1-methyl-imidazol in the arms of a N-6-tripodal ligand to prepare two new Co-II complexes with quasi-ideal triangular prismatic geometry, which act as SIMs with enhanced axial magnetic anisotropy, magnetic relaxation times, and magnetic hysteresis at zero dc field.
CHEMICAL COMMUNICATIONS
(2023)
Article
Physics, Applied
Hao Ou, Koshi Oi, Rei Usami, Takahiko Endo, Yasumitsu Miyata, Jiang Pu, Taishi Takenobu
Summary: In this study, heterostructures of TMDCs and hBN were successfully fabricated into light-emitting devices. Monolayer and artificially stacked homobilayer WS2 were prepared on hBN, respectively. Both devices showed clear electroluminescence with voltages of similar to 3 V. The results indicate the enhancement of the optical performance of TMDCs and the potential expansion of TMDC-based light-emitting devices.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Hiroo Suzuki, Misaki Kishibuchi, Masaaki Misawa, Kazuma Shimogami, Soya Ochiai, Takahiro Kokura, Yijun Liu, Ryoki Hashimoto, Zheng Liu, Kenji Tsuruta, Yasumitsu Miyata, Yasuhiko Hayashi
Summary: Transition metal dichalcogenides (TMDCs) are promising 2D materials for optoelectronic devices and physics advancements. This study successfully synthesized long WxOy nanowires and grew monolayer WS2 nanoribbons on their surface. The developed method demonstrated high monolayer selectivity and enabled the growth of long WS2 nanoribbons with desired electronic properties. These findings have potential applications in future optoelectronic devices and advanced physics research.
Article
Chemistry, Multidisciplinary
Hiroto Ogura, Seiya Kawasaki, Zheng Liu, Takahiko Endo, Mina Maruyama, Yanlin Gao, Yusuke Nakanishi, Hong En Lim, Kazuhiro Yanagi, Toshifumi Irisawa, Keiji Ueno, Susumu Okada, Kosuke Nagashio, Yasumitsu Miyata
Summary: In-plane heterostructures of TMDCs have been fabricated through CVD, and their optical and electrical properties have been investigated. Multilayer TMDCs are a promising component for solving the low dielectric issue of monolayers. The formation of multilayer TMDC-based in-plane heterostructures and the vertical growth of MoS2 on the exfoliated flakes have been achieved.
Article
Chemistry, Multidisciplinary
Ryusuke Natsui, Hiroshi Shimizu, Yusuke Nakanishi, Zheng Liu, Akito Shimamura, Nguyen Tuan Hung, Yung-Chang Lin, Takahiko Endo, Jiang Pu, Iori Kikuchi, Taishi Takenobu, Susumu Okada, Kazu Suenaga, Riichiro Saito, Yasumitsu Miyata
Summary: This study presents a versatile method to fabricate nanoscale-thick bundles of indium-intercalated tungsten hexachalcogenide (W6Te6) wires. These bundles exhibit metallic behavior and mechanical flexibility, making them promising building blocks for integrated nanocircuits.
Article
Multidisciplinary Sciences
J. -J. Wen, W. He, H. Jang, H. Nojiri, S. Matsuzawa, S. Song, M. Chollet, D. Zhu, Y. -J. Liu, M. Fujita, J. M. Jiang, C. R. Rotundu, C. -C. Kao, H. -C. Jiang, J. -S. Lee, Y. S. Lee
Summary: Using x-ray scattering, researchers have found that the amplitude of charge-density waves (CDW) in the prototypical cuprate La1.885Sr0.115CuO4 suddenly increases upon entering the superconducting vortex-liquid state at high magnetic fields. This indicates a strong coupling between CDW and superconductivity, and suggests that the enhanced CDW amplitude is linked to local superconducting pairing.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Jing-Wei Dai, Yu-Qin Li, Zhao-Yang Li, Hai-Tao Zhang, Carmen Herrmann, Shohei Kumagai, Marko Damjanovic, Markus Enders, Hiroyuki Nojiri, Masakazu Morimoto, Norihisa Hoshino, Tomoyuki Akutagawa, Masahiro Yamashita
Summary: A photoswitchable and valence tautomeric coordination polymer was synthesized, which displayed significant molecular anisotropy and allowed the direct observation of dual organic radicals. The synergy effect between magnetic bistability and conductivity was achieved.
NATIONAL SCIENCE REVIEW
(2023)
Article
Instruments & Instrumentation
Jianwei Huang, Ziqin Yue, Andrey Baydin, Hanyu Zhu, Hiroyuki Nojiri, Junichiro Kono, Yu He, Ming Yi
Summary: This paper introduces an easily implementable method for realizing an in situ tunable magnetic field at the sample position in an ARPES experiment and analyzes the magnetic-field-induced artifacts in the ARPES data. The authors identified and quantified three distinct extrinsic effects of a magnetic field and demonstrated the feasibility of ARPES measurements in the presence of a controllable magnetic field in three prototypical quantum materials.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Physics, Multidisciplinary
S. E. Nikitin, Tao Xie, A. Gazizulina, B. Ouladdiaf, J. A. Rodriguez Velamazan, I. F. Diaz-Ortega, H. Nojiri, L. M. Anovitz, A. M. dos Santos, O. Prokhnenko, A. Podlesnyak
Summary: We directly observed a commensurate-ordered antiferromagnetic (AFM) state and incommensurate helical spin dynamics in the natural mineral brochantite Cu4SO4(OH)6 through neutron diffraction and neutron spectroscopy measurements. Our findings reveal the strong one-dimensional character of the magnetic correlations and the effect of the uniform Dzyaloshinskii-Moriya (DM) interaction. The symmetric exchange parameters and the DM vector components in Cu4SO4(OH)6 were quantified, and the mechanism of the magnetic frustration was determined.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
G. Senthil Murugan, Chanhyeon Lee, R. Kalaivanan, I. Panneer Muthuselvam, Yugo Oshima, Kwang-Yong Choi, R. Sankar
Summary: We studied the magnetic properties of the kagome ferromagnet Li9Cr3(P2O7)3(PO4)2 using various techniques. The results show ferromagnetic ordering at TC = 2.7 K and persistence of two-dimensional magnetic correlations up to temperatures as high as ~18 TC. We observed a change in spin dynamics at about T * = 4.4 TC and an unexpected suppression of the 7Li spin-lattice relaxation rate 1/T1 below 50 K.
Article
Physics, Multidisciplinary
Andrey Baydin, Kenji Hayashida, Takuma Makihara, Fuyang Tay, Xiaoxuan Ma, Wei Ren, Guohong Ma, G. Timothy Noe, Ikufumi Katayama, Jun Takeda, Hiroyuki Nojiri, Shixun Cao, Motoaki Bamba, Junichiro Kono
Summary: Depending on the relative rates of coupling and dissipation, a light-matter coupled system is either in the weak or strong-coupling regime. In this study, a unique system is presented where the coupling rate continuously increases with an externally applied magnetic field while the dissipation rate remains constant, enabling the monitoring of a weak-to-strong coupling transition. A terahertz magnon mode in yttrium orthoferrite is observed to undergo Rabi splitting above a threshold magnetic field, indicating the transition into magnon polaritons through an exceptional point with increasing magnetic field. This finding opens up new opportunities for in situ control of non-Hermitian systems.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Instruments & Instrumentation
Masao Watanabe, Takumi Kihara, Hiroyuki Nojiri
Summary: A pulsed magnet system has been developed at the Materials and Life Science Experimental Facility in Japan Proton Accelerator Research Complex, which provides a user-friendly sample environment. The system includes a vacuum chamber, a 4 K closed-cycle refrigerator, and a nitrogen bath with a miniature solenoidal coil. The coil is cooled by liquid nitrogen supplied by an automatic system, while the sample is cooled by a refrigerator. This system enables automatic high magnetic field diffraction measurement, with a wide scattering angle up to 42 degrees. Neutron diffraction experiments on a multiferroic material were successfully performed.
QUANTUM BEAM SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Shaochun Zhang, Mina Maruyama, Susumu Okada, Mengsong Xue, Kenji Watanabe, Takashi Taniguchi, Kazuki Hashimoto, Yasumitsu Miyata, Ruben Canton-Vitoria, Ryo Kitaura
Summary: This study reports the observation of the photovoltaic effect in a WS2/MoS2 van der Waals heterostructure. Light excitation of WS2/MoS2 at a wavelength of 633 nm leads to a photocurrent without applying bias voltages.
Article
Chemistry, Multidisciplinary
Hiroto Ogura, Seiya Kawasaki, Zheng Liu, Takahiko Endo, Mina Maruyama, Yanlin Gao, Yusuke Nakanishi, Hong En Lim, Kazuhiro Yanagi, Toshifumi Irisawa, Keiji Ueno, Susumu Okada, Kosuke Nagashio, Yasumitsu Miyata
Summary: In-plane heterostructures of transition metal dichalcogenides (TMDCs) have been extensively studied for their high-performance electronic and optoelectronic devices. Currently, monolayer-based in-plane heterostructures prepared by chemical vapor deposition (CVD) have been explored, but their low dielectric properties limit their potential applications. In this study, we demonstrate the fabrication and transport properties of multilayer TMDC-based in-plane heterostructures, which show promising potential for various electronic devices. We also observe vertical growth of TMDCs on exfoliated flakes, further expanding their potential applications.
