Article
Multidisciplinary Sciences
Philipp Merkl, Chaw-Keong Yong, Marlene Liebich, Isabella Hofmeister, Gunnar Berghaeuser, Ermin Malic, Rupert Huber
Summary: The authors demonstrate proximity-controlled strong-coupling between Coulomb correlations and lattice dynamics in neighboring van der Waals materials (WSe2 and a gypsum layer), creating electrically neutral hybrid exciton-phonon eigenmodes called excitonic Lyman polarons. This approach provides a promising new strategy to engineer novel ground states of two-dimensional systems by controlling the spatial wavefunction overlap of excitons and phonons.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Maria G. Burdanova, Ming Liu, Michael Staniforth, Yongjia Zheng, Rong Xiang, Shohei Chiashi, Anton Anisimov, Esko Kauppinen, Shigeo Maruyama, James Lloyd-Hughes
Summary: Strong intertube excitonic coupling is demonstrated in 1D van der Waals heterostructures through the interaction of dipole-dipole Coulomb interactions and light-matter interactions. This leads to the creation of intertube biexcitons on short timescales and intertube excitons on longer timescales, which opens up new possibilities for multi-functional applications of these new nanoscale coaxial cables.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
X. R. Hou, S. D. Wang
Summary: In this study, the quasiparticle band structures and excitonic optical properties of SiC/MoSSe heterostructures were investigated using the GW + Bethe-Salpeter equation approach. The results show that all four stable structures of SiC/MoSSe heterostructures are favorable for producing high binding energy interlayer excitons. The modulation of optical dipole oscillator strength and radiative lifetimes is significant due to the different intrinsic dipole moments of MoSSe.
APPLIED SURFACE SCIENCE
(2021)
Review
Chemistry, Multidisciplinary
Xin Wu, Xiyue Chen, Ruxue Yang, Jianbin Zhan, Yingzhi Ren, Kun Li
Summary: 2D vdW heterostructures have attracted research attention for their theoretical properties and application potentials. However, the synthesized heterostructures generally underperform due to weak interlayer coupling. This paper provides a state-of-the-art review of different techniques for performance modulation of vdW heterostructures, summarizing general synthesis methods and discussing mechanical-based, external fields-assisted, and particle beam irradiation-based methods. The applications and future prospects of tailored properties in vdW heterostructures are also reviewed.
Article
Chemistry, Multidisciplinary
Tae Gwan Park, Byoung Ki Choi, Junho Park, Jungdae Kim, Young Jun Chang, Fabian Rotermund
Summary: Atomically thin vanadium diselenide (VSe2) is a two-dimensional transition metal dichalcogenide known for its metallic 1T phase, and recent studies have shown efficient interlayer hot electron transfer in VSe2/graphene heterostructures, which can have potential applications in optoelectronic and photonic devices.
Article
Chemistry, Physical
Mingming Yang, Longlong Wang, Guofeng Hu, Xue Chen, Peng Lai Gong, Xin Cong, Yi Liu, Yuanbo Yang, Xiaoli Li, Xiaohui Zhao, Xuelu Liu
Summary: The study investigates the interlayer coupling in graphene/MoS2 vdW heterostructures through spectroscopy analysis, revealing the electron transfer and coupling mechanism between graphene and MoS2.
Review
Chemistry, Multidisciplinary
Xiangdong Guo, Wei Lyu, Tinghan Chen, Yang Luo, Chenchen Wu, Bei Yang, Zhipei Sun, F. Javier Garcia de Abajo, Xiaoxia Yang, Qing Dai
Summary: 2D monolayers can be vertically stacked in van der Waals heterostructures to support a wide range of confined polaritons. This offers advantages in terms of controlling the constituent layers, stacking sequence, and twist angles. These heterostructures have extended the performance and functions of polaritons, and potential applications include nanophotonic integrated circuits.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Zenglong Guo, Lei Wang, Mengjiao Han, Erding Zhao, Liang Zhu, Weiteng Guo, Junyang Tan, Bilu Liu, Xing-Qiu Chen, Junhao Lin
Summary: A one-step growth method was developed to controllably grow bilayer 2H-1T-MoTe2 vdWHs in a small growth window. Atomic-resolution transmission electron microscopy revealed the distinct moire patterns in the bilayer vdWHs, confirming the epitaxial nature of the top 2H phase. Resonance vibration modes were found to modulate the interlayer coupling in the bilayer vdWHs, as demonstrated by angle-resolved polarized Raman spectroscopy and first-principles calculations.
Article
Chemistry, Multidisciplinary
Zenglong Guo, Lei Wang, Mengjiao Han, Erding Zhao, Liang Zhu, Weiteng Guo, Junyang Tan, Bilu Liu, Xing-Qiu Chen, Junhao Lin
Summary: A one-step growth method was developed to controllably grow bilayer 2H???1T??? MoTe2 vdWHs in a small growth window, modulating interlayer coupling by resonating their vibration modes.
Article
Chemistry, Multidisciplinary
Hugh Ramsden, Soumya Sarkar, Yan Wang, Yiru Zhu, James Kerfoot, Evgeny M. Alexeev, Takashi Taniguchi, Kenji Watanabe, Sefaattin Tongay, Andrea C. Ferrari, Manish Chhowalla
Summary: van der Waals heterostructures (vdW-HSs) integrate dissimilar materials to form complex devices, relying on the manipulation of charges at multiple interfaces. Conductive mode and cathodoluminescence scanning electron microscopy (CM-SEM and SEM-CL) were used to investigate the trapping of charges in vdW-HSs during electron irradiation, which can adversely affect the performance of the devices. The results showed that up to 70% of beam electrons are deposited into the vdW-HS, leading to dynamic doping of 1L-WSe2 and reducing its cathodoluminescence efficiency. CM-SEM and SEM-CL provide a toolkit for nanoscale characterization of vdW-HS devices, allowing for the correlation of electrical and optical properties.
Review
Chemistry, Multidisciplinary
Waqas Ahmad, Liang Pan, Karim Khan, Lingpu Jia, Qiandong Zhuang, Zhiming Wang
Summary: Van der Waals (vdWs) heterostructures enable bandgap engineering of different 2D materials to broaden the spectrum beyond individual 2D materials' cut-off wavelength. Interlayer transition plays a significant role in the optoelectronic performance of vdWs heterostructure devices, and strong interlayer transition is always desirable for charge transfer and speed response. This review summarizes recent progress on interlayer transition in vdWs heterostructures for near-infrared (NIR) photodetectors, including synthesis techniques, band alignments, mechanism, and applications.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Hui-Lei Hou, Cosimo Anichini, Paolo Samori, Alejandro Criado, Maurizio Prato
Summary: In the past 15 years, 2D materials have revolutionized materials science and become powerful components for high-performance chemical sensors. By forming van der Waals heterostructures (VDWHs), the individual drawbacks of 2D materials can be overcome, leading to superior sensitivities, selectivity, and stability. This review discusses the latest developments in chemical sensors based on VDWHs of 2D materials, including sensing mechanisms and future directions with potential impact in environmental sciences and biomedical applications.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Review
Materials Science, Multidisciplinary
Lixin Liu, Tianyou Zhai
Summary: The article reviews the latest research activities on wafer-scale vdWHs and their applications, outlining preparation strategies and applications to showcase their potential in electronic, optoelectronic, and flexible devices fields.
Article
Materials Science, Multidisciplinary
Jia-Pei Deng, Zi-Wu Wang, Yu Cui, Yi-Yan Liu, Xin-Jun Ma, Shao-Juan Li, Zhi-Qing Li
Summary: This study explores the quantum phase transitions of interlayer excitons in van der Waals heterostructures and proposes a strategy to distinguish different exciton phases through multiphonon Raman scattering.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2023)
Article
Physics, Multidisciplinary
Yuan-Yuan Wang, Feng-Ping Li, Wei Wei, Bai-Biao Huang, Ying Dai
Summary: The band offset of type-II band alignment in TMDCs vdW heterobilayer can be tuned by introducing Janus WSSe monolayer, and the interlayer coupling strength can be adjusted by interlayer electric polarization. Additionally, the difference in formation mechanism of interlayer valley excitons in different TMDCs vdW heterobilayers with various interlayer hopping strength was clarified.
FRONTIERS OF PHYSICS
(2021)
Article
Chemistry, Analytical
Xiao Ma, Georges Pavlidis, Eoghan Dillon, Victoria Beltran, Jeffrey J. Schwartz, Mathieu Thoury, Ferenc Borondics, Christophe Sandt, Kevin Kjoller, Barbara H. Berrie, Andrea Centrone
Summary: Formation and aggregation of metal carboxylates can degrade oil paintings. The limited spatial resolution of traditional methods hampers the understanding of the formation of metal soaps. In this study, two novel methods with higher spatial resolution were used to investigate the distribution of chemical phases in a 19th-century painting. The newly accessible nanocompositional information will advance the knowledge of chemical processes in oil paint and stimulate new art conservation practices.
ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Mingkang Wang, Georg Ramer, Diego J. Perez-Morelo, Georges Pavlidis, Jeffrey J. Schwatz, Liya Yu, Robert Ilic, Vladimir A. Aksyuk, Andrea Centrone
Summary: This study developed a new nanoscale thermal measurement technique that can rapidly measure the thermal dynamics of materials at the nanoscale, providing a new method for studying materials and devices.
Article
Nanoscience & Nanotechnology
Siyuan Zhang, Hsun-Jen Chuang, Son T. Le, Curt A. Richter, Kathleen M. McCreary, Berend T. Jonker, Angela R. Hight R. Walker, Christina A. Hacker
Summary: This study demonstrates a post-growth n-doping method for monolayer WS2 using a molecular reductant solution, enabling effective control of the doping level. The doped WS2 field-effect transistors exhibit improved electrical properties and enhanced charge injection efficiency.
Article
Chemistry, Multidisciplinary
Christopher E. Stevens, Hsun-Jen Chuang, Matthew R. Rosenberger, Kathleen M. McCreary, Chandriker Kavir Dass, Berend T. Jonker, Joshua R. Hendrickson
Summary: In this study, we propose a method using applied electrostatic potential to suppress the broad defect bound excitonic emission in two-dimensional materials. The results show that the electrostatic potential can effectively reduce the background of defect bound emission, significantly improve the purity of single photon emitters, increase the intensity of SPEs, and enable activation/deactivation of emitters at certain wavelengths. In addition, the operating temperature of the SPE is increased by 50K when applying the electrostatic potential.
Article
Chemistry, Multidisciplinary
Robert D. Neal, Zachary R. Lawson, Walker J. Tuff, Kaikui Xu, Vishal Kumar, Matiyas T. Korsa, Maksym Zhukovskyi, Matthew R. Rosenberger, Jost Adam, Jordan A. Hachtel, Jon P. Camden, Robert A. Hughes, Svetlana Neretina
Summary: This paper presents a benchtop process for the formation of large-area periodic arrays of gold nanotriangles, addressing the challenge of scaling up the formation of such arrays. The synthesized gold nanotriangles are epitaxially aligned with the substrate, have increased thickness compared to colloidal syntheses, and exhibit atomically flat surface with close-packed gold atoms, resulting in clear and distinct plasmonic modes.
Article
Chemistry, Multidisciplinary
Andrea Centrone, Belen Lerma-Berlanga, Adam J. Biacchi, Carmen Fernandez-Conde, Georges Pavlidis, Carlos Marti-Gastaldo
Summary: This study utilizes high spatial resolution infrared nanoscopy and chemical specific imaging to investigate the distribution of linkers in metal-organic framework crystals. The results reveal an onion-like structure in the crystals and surface reconstruction during linker exchange.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Physics, Applied
Matthew P. West, Georges Pavlidis, Robert H. Montgomery, Fabia Farlin Athena, Muhammad S. Jamil, Andrea Centrone, Samuel Graham, Eric M. Vogel
Summary: With increasing demand for computing applications capable of handling large datasets, there is a growing need for new in-memory computing technologies. Oxide-based resistive random-access memory (RRAM) devices show promise for such applications due to their industry readiness, endurance, and switching ratio. However, these analog devices suffer from poor linearity and asymmetry in their analog resistance change, as well as high local temperature during operation.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Multidisciplinary Sciences
Mingkang Wang, Diego J. Perez-Morelo, Georg Ramer, Georges Pavlidis, Jeffrey J. Schwartz, Liya Yu, Robert Ilic, Andrea Centrone, Vladimir A. Aksyuk
Summary: The researchers propose and experimentally demonstrate a measurement method that reduces the effective temperature of the sensor and improves the measurement precision of a dynamic impulse response signal. By using thermal noise-limited, integrated cavity optomechanical atomic force microscopy probes in a photothermal-induced resonance measurement, the effective temperature of the sensor can be reduced by a factor of approximately 25, from room temperature down to approximately 12 K, without cryogens. The method improves the experimental measurement precision and throughput by more than 2x, approaching the theoretical limit of approximately 3.5x improvement for their experimental conditions. The general applicability of this method to dynamic measurements leveraging thermal noise-limited harmonic transducers will have a broad impact across a variety of measurement platforms and scientific fields.
Article
Chemistry, Physical
Jeffrey J. J. Schwartz, Sergiy Krylyuk, Devon S. S. Jakob, Albert V. V. Davydov, Andrea Centrone
Summary: Control over the local chemical composition and spatial heterogeneities allows for new functions and tailored properties in nanomaterials. Intercalation is a useful strategy in two-dimensional materials to achieve such control. This study demonstrates the highly heterogeneous and optically dark patterns observed in hydrogen molybdenum bronzes and/or oxygen-deficient molybdenum oxides after thermal annealing, which can be characterized using nanoscale resolution imaging and spectroscopy. The high-resolution techniques employed provide precise measurements of nanoscale heterogeneities, advancing the utilization of 2D and other materials in advanced applications.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Review
Chemistry, Multidisciplinary
Jeffrey J. Schwartz, Devon S. Jakob, Andrea Centrone
Summary: This article introduces the latest breakthroughs and working principles of AFM-IR spectroscopy and imaging, discusses best practices for different AFM-IR measurement paradigms, and provides key information and instructive experiments on AFM-IR signal transduction. Additionally, it provides detailed tutorials on commonly used AFM-IR variants and recently developed modalities, and offers insights into the exciting opportunities and prospects of this fast-growing and evolving field.
CHEMICAL SOCIETY REVIEWS
(2022)