Article
Chemistry, Physical
Wenhui Niu, Simen Sopp, Alessandro Lodi, Alex Gee, Fanmiao Kong, Tian Pei, Pascal Gehring, Jonathan Naegele, Chit Siong Lau, Ji Ma, Junzhi Liu, Akimitsu Narita, Jan Mol, Marko Burghard, Klaus Muellen, Yiyong Mai, Xinliang Feng, Lapo Bogani
Summary: Only single-electron transistors with a certain level of cleanliness can be used for quantum experiments. The solubility of graphene nanoribbons can be greatly enhanced by edge functionalization, resulting in ultra-clean transport devices with sharp single-electron features. These results demonstrate that molecular graphene can yield exceptionally clean electronic devices directly from solution.
Article
Physics, Multidisciplinary
Sofia Sanz, Nick Papior, Geza Giedke, Daniel Sanchez-Portal, Mads Brandbyge, Thomas Frederiksen
Summary: This study investigated structures composed of narrow zigzag graphene nanoribbons (GNRs) and found that the beam-splitting effect can survive under Coulomb repulsion and a spin-dependent scattering potential can emerge. The researchers also discovered that this is a general feature with edge-polarized nanoribbons, and near-perfect polarization can be achieved by joining several junctions in series.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Physical
Gesiel G. Silva, Wiliam F. da Cunha, Marcelo L. Pereira Junior, Luiz F. Roncaratti, Luiz A. Ribeiro Junior
Summary: Our investigation on bipolaron dynamics in armchair graphene nanoribbons (AGNRs) reveals that in different electric fields and electron-phonon coupling regimes, bipolarons in narrower AGNRs move as fast as those in conjugated polymers, shedding light on the behavior of charge carriers in graphene nanoribbons.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Thi My Duyen Huynh, Guo-Song Hung, Godfrey Gumbs, Ngoc Thanh Thuy Tran
Summary: In this study, first-principles calculations are used to investigate the feature-rich properties of alkali-metal intercalated graphene nanoribbons (GNRs), including edge passivation, stacking configurations, intercalation sites, stability, charge density distribution, magnetic configuration, and electronic properties. The findings demonstrate a transformation from finite gap semiconducting to metallic behaviors, indicating enhanced electrical conductivity. This transformation is attributed to the cooperative or competitive relations among the significant chemical bonds, finite-size quantum confinement, edge structure, and stacking order. The decoration of edge structures with hydrogen and oxygen atoms provides additional information about stability and magnetization due to the ribbons' effect.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Review
Chemistry, Multidisciplinary
R. S. Koen Houtsma, Joris de la Rie, Meike Stohr
Summary: Graphene nanoribbons show great potential for future applications in nanoelectronic devices by combining excellent electronic properties with tunability through precise control over width and edge structure. Research has led to a variety of graphene nanoribbons with different properties, highlighting the importance of precursor design in determining final electronic structure. The ability to fine-tune properties through precursor design has generated significant research interest and potential for future applications, as demonstrated by selected device prototypes.
CHEMICAL SOCIETY REVIEWS
(2021)
Review
Chemistry, Multidisciplinary
Wenjing Bo, Yi Zou, Jingang Wang
Summary: Graphene nanoribbons (GNRs), as representatives of nano-graphene materials, possess novel electrical properties, highly adjustable electronic properties, and optoelectronic properties due to their diverse geometric structures and atomic precision configurations. The electrical properties and band gaps of GNRs are influenced by factors such as width, length, boundary configuration, and elemental doping. With advancements in preparation technology, an increasing number of GNRs with different configurations are being produced, offering new possibilities for applications in microelectronics.
Article
Chemistry, Physical
Meng Han, Dasha Mao, Ting Liang, Enze Gao, Xue Bai, Xiaoliang Zeng, Rong Sun, Jianbin Xu
Summary: A novel phase transition from semiconducting to metallic behaviors in commercially available graphene films is observed in this study, which is correlated with the defects level. Furthermore, a linear relationship between the transition temperature and the residual thermal reffusivity is discovered, both of which are strongly correlated to the defects level.
Article
Multidisciplinary Sciences
Golnaz Khanlar, Sahar Izadi Vishkayi, Hamid Rahimpour Soleimani
Summary: The spin filtering junctions composed of graphene and silicon carbide nanoribbons exhibit enhanced electrical and spin conductances, with vacancy defects contributing to the improved spin-filtering effect. The considered junctions display characteristics of a half-metal with reduced thermal conductance, making them suitable for spin-dependent thermoelectric devices. This research predicts the promising potential of the junctions for application in spintronic devices.
SCIENTIFIC REPORTS
(2021)
Article
Physics, Applied
E. J. Robles-Raygoza, V. G. Ibarra-Sierra, J. C. Sandoval-Santana, R. Carrillo-Bastos
Summary: Graphene nanoribbons (GNRs) are natural waveguides for electrons in graphene, but their conductance is suppressed due to scattering with edge disorder. This paper explores the use of strain folds and scalar potentials as internal waveguides to isolate specific modes from edge disorder and improve conductance. The study finds that the presence of internal waveguiding leads to an improvement in electronic conductance of GNRs, with quasi-ballistic properties and robustness against edge disorder.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Junjie Chen, Lingyu Meng
Summary: Understanding the effect of phonon scattering on the thermal transport properties of graphene ribbons is of great importance. This study investigated the heat transport properties of graphene ribbons by considering different polarization branches with different frequencies. The results showed that graphene ribbons have high heat conductivity in all cases, and the temperature strongly affects the relative contribution of the phonon branches.
Article
Materials Science, Multidisciplinary
Cheng-yi Zuo, Junjie Qi, Tian-lun Lu, Zhi-qiang Bao, Yan Li
Summary: Strain has been found to affect the band structures and properties of graphene nanoribbons, generating pseudomagnetic fields and pseudo Landau levels. By designing specific strains, reverse pseudomagnetic fields with opposite signs can be produced, allowing electrons to propagate along the interface as "snake states". Furthermore, the possibility of achieving pure valley currents in monolayer graphene systems is proposed.
Article
Chemistry, Physical
Hui Shan Wang, Lingxiu Chen, Kenan Elibol, Li He, Haomin Wang, Chen Chen, Chengxin Jiang, Chen Li, Tianru Wu, Chun Xiao Cong, Timothy J. Pennycook, Giacomo Argentero, Daoli Zhang, Kenji Watanabe, Takashi Taniguchi, Wenya Wei, Qinghong Yuan, Jannik C. Meyer, Xiaoming Xie
Summary: Utilizing oriented trenches in h-BN as templates, armchair and zigzag graphene nanoribbons with chirality-dependent electrical and magnetic conductance properties were successfully grown, offering a promising route for integrated circuitry of atomic thickness. Fabricating edge-specific GNRs in the lattice of h-BN remains a significant challenge despite the developed two-step growth method for achieving sub-5-nm-wide zigzag and armchair GNRs. Conductance measurements show that different widths of zigzag GNRs exhibit openings of the bandgap inversely proportional to their width, while armchair GNRs display fluctuation in this relationship.
Article
Chemistry, Multidisciplinary
Thi Thuy Nhung Nguyen, Niels de Vries, Hrag Karakachian, Markus Gruschwitz, Johannes Aprojanz, Alexei A. Zakharov, Craig Polley, Thiagarajan Balasubramanian, Ulrich Starke, Cornelis F. J. Flipse, Christoph Tegenkamp
Summary: Protected and spin-polarized transport channels are identified in epitaxially grown zigzag graphene nanoribbons (zz-GNRs), despite weak spin-orbit interaction. The structure exhibits a surface state on the SiC(0001) substrate merging into the lower edge. Spectroscopic details are described using a tight binding model with a Haldane term and strain effects, revealing a breaking of time-reversal symmetry without external magnetic fields. Ballistic transport indicates a conductivity of G = e(2)/h.
Article
Chemistry, Physical
Abimannan Sethurajaperumal, Vanmathi Ravichandran, Ivan Merenkov, Kostya (Ken) Ostrikov, Eswaraiah Varrla
Summary: Liquid-phase exfoliation of 3D solid precursors into ultra-thin sheets of layered materials has gained global interest due to its simplicity and industrial applicability. The characteristics of exfoliated graphene depend on the processing technique and properties of the starting precursor materials. This study explored the role of initial 3D precursors in creating 2D materials by exfoliating graphite flakes of different sizes, and assessed the morphology and defects of the resulting nanosheets.
Article
Materials Science, Multidisciplinary
Vit Jakubsky, Sengul Kuru, Javier Negro
Summary: We studied the confinement of Dirac fermions in armchair graphene nanoribbons using electrostatic quantum dots. We provided an analytically feasible model where some bound states can be explicitly found. We showed that the energies of these bound states either belong to the gap between the valence and conducting bands, or represent bound states in the continuum with energies embedded in the continuous spectrum. Solutions satisfying armchair boundary conditions were elegantly found using specific projection operators.
Article
Engineering, Electrical & Electronic
Maryam Sakhdari, Mehdi Hajizadegan, Yue Li, Mark Ming-Cheng Cheng, Jonathan C. H. Hung, Pai-Yen Chen
IEEE SENSORS JOURNAL
(2018)
Article
Chemistry, Multidisciplinary
Zhibin Gao, Zhixian Zhou, David Tomanek
Article
Electrochemistry
Wenduo Zeng, Mark Ming-Cheng Cheng, K. Y. Simon Ng
Article
Engineering, Electrical & Electronic
Qingsong Cui, Pooja Thakur, Corneliu Rablau, Ivan Avrutsky, Mark Ming-Cheng Cheng
IEEE SENSORS JOURNAL
(2019)
Article
Chemistry, Physical
Jimmy Ching-Ming Chen, Jinho Yang, Mark Ming-Cheng Cheng
JOURNAL OF POWER SOURCES
(2019)
Article
Electrochemistry
Wenduo Zeng, Mark Ming-Cheng Cheng, Simon Ka-Yuen Ng
ELECTROCHIMICA ACTA
(2019)
Article
Chemistry, Multidisciplinary
Kraig Andrews, Arthur Bowman, Upendra Rijal, Pai-Yen Chen, Zhixian Zhou
Article
Nanoscience & Nanotechnology
Christian D. Ornelas, Arthur Bowman, Thayer S. Walmsley, Tianjiao Wang, Kraig Andrews, Zhixian Zhou, Ya-Qiong Xu
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Nanoscience & Nanotechnology
Lily J. Stanley, Hsun-Jen Chuang, Zhixian Zhou, Michael R. Koehler, Jiaqiang Yan, David G. Mandrus, Dragana Popovic
Summary: The fabrication of hBN-encapsulated multiterminal WSe2 devices with 2D/2D low-temperature Ohmic contacts allows for investigation of the 2D metal-insulator transition. The devices exhibit Ohmic behavior down to 0.25 K and enable accurate determination of carrier density. Measurements show scaling behavior consistent with a metal-insulator quantum phase transition driven by electron-electron interactions and disorder-induced local magnetic moments.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Kraig Andrews, Upendra Rijal, Arthur Bowman, Hsun-Jen Chuang, Michael R. Koehler, Jiaqiang Yan, David G. Mandrus, Pai-Yen Chen, Zhixian Zhou
Summary: This study demonstrates the successful fabrication of ohmic van der Waals contacts to nearly intrinsic WSe2 nanosheets without the need for electrostatic gating. By utilizing p(+)-MoS2 as contact metal, high device performance in back-gated FETs was achieved, showcasing linear output characteristics, high on/off ratio, and high field-effect mobility. The formation of accumulation-type ohmic contacts is attributed to the absence of Fermi-level pinning effects at the vdW interface and the appropriate work function of p(+)-MoS2. This research represents a significant advance towards low-resistance ohmic contacts in next-generation 2D semiconductor-based nanoelectronics.
ACS APPLIED NANO MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Xuebin Tan, Minye Yang, Liang Zhu, Gayathri Gunathilaka, Zhixian Zhou, Pai-Yen Chen, Yifan Zhang, Mark Ming-Cheng Cheng
Summary: The study introduces a graphene biosensor based on a field-effect transistor architecture for continuous monitoring of bacteria, showing high sensitivity, selectivity, and cost-effectiveness. The device utilizes chemical-vapor-deposition graphene monolayers functionalized with phage tail spike proteins to capture E. coli bacteria for accurate and selective detection.
IEEE SENSORS JOURNAL
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Boshen Zhang, Jing Hua, Yang Zhao, Jimmy Ching-Ming Chen, Mark Ming-Cheng Cheng
2019 20TH INTERNATIONAL CONFERENCE ON SOLID-STATE SENSORS, ACTUATORS AND MICROSYSTEMS & EUROSENSORS XXXIII (TRANSDUCERS & EUROSENSORS XXXIII)
(2019)
Proceedings Paper
Engineering, Electrical & Electronic
Gui Chen, Marcella Gatti, Mark Ming-Cheng Cheng
2019 20TH INTERNATIONAL CONFERENCE ON SOLID-STATE SENSORS, ACTUATORS AND MICROSYSTEMS & EUROSENSORS XXXIII (TRANSDUCERS & EUROSENSORS XXXIII)
(2019)
Article
Chemistry, Multidisciplinary
Thayer S. Walmsley, Kraig Andrews, Tianjiao Wang, Amanda Haglund, Upendra Rijal, Arthur Bowman, David Mandrus, Zhixian Zhou, Ya-Qiong Xu
Article
Chemistry, Multidisciplinary
Xuyi Luo, Kraig Andrews, Tianjiao Wang, Arthur Bowman, Zhixian Zhou, Ya-Qiong Xu
