Article
Chemistry, Multidisciplinary
Aleksander Bach Lorentzen, Mehdi Bouatou, Cyril Chacon, Yannick J. Dappe, Jerome Lagoute, Mads Brandbyge
Summary: Recent studies have shown the spatial control of nitrogen dopant concentration in graphene using a molecular mask. This technique enables the creation of ballistic electron optics-like structures and has implications for current focusing and quantized conductance.
Article
Chemistry, Multidisciplinary
Juhi Srivastava, Anshu Gaur
Summary: Recent studies have shown that factors such as charge transfer, structural deformation, and van der Waals forces play crucial roles in affecting the vibrational properties of hybrid carbon nanostructures based on SWNTs and SLG. As the distance between SWNTs and SLG decreases, both charge transfer and van der Waals forces increase, with the latter having a relatively higher impact and likely being the main reason for larger Raman shifts observed at smaller separations.
NANOSCALE ADVANCES
(2021)
Article
Physics, Multidisciplinary
Young Woo Choi, Marvin L. Cohen
Summary: We investigated the electromigration forces for weakly bonded adsorbates on graphene using density-functional based calculations. The results showed that the nature of electromigration forces depends critically on the energy level alignment between the adsorbate state and the Fermi level of the graphene. For resonant adsorbates, the electromigration force is dominated by the electron wind force, while for nonresonant adsorbates, it is essentially the direct force dependent on the adsorbate charge. Moreover, we demonstrated that the magnitude of electromigration forces can be continuously adjusted through electrostatic gating for resonant adsorbates.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Jiachen Ma, Chen Yang, Qiuhui Li, Shiqi Liu, Linqiang Xu, Shibo Fang, Xiaotian Sun, Ruge Quhe, Feng Pan, Jing Lu
Summary: A thermodynamically and kinetically stable 3D hierarchical carbonaceous nanostructure is constructed and its potential as an anode for sodium-ion batteries is examined. The structure exhibits excellent conductivity and ion transport properties, making it a promising candidate for high-performance SIBs.
ADVANCED THEORY AND SIMULATIONS
(2022)
Article
Chemistry, Multidisciplinary
Jiangtao Wang, Ji-Hoon Park, Ang-Yu Lu, Jing Kong
Summary: Chemical vapor deposition (CVD) is a widely used method for efficient growth of low-dimensional materials. Researchers have discovered that applying an electric field between the copper substrate and a counter electrode has significant effects on the growth of graphene. By applying negative and positive voltages on the growth substrate, selective growth and rapid growth of clean graphene films can be achieved.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Nanoscience & Nanotechnology
Jonah Waissman, Laurel E. Anderson, Artem Talanov, Zhongying Yan, Young J. Shin, Danial H. Najafabadi, Mehdi Rezaee, Xiaowen Feng, Daniel G. Nocera, Takashi Taniguchi, Kenji Watanabe, Brian Skinner, Konstantin A. Matveev, Philip Kim
Summary: The combination of reduced dimensionality, strong interactions, and topology in low-dimensional systems leads to many-body quantum phenomena. Thermal transport serves as a discriminating probe in quantum materials and devices, with the need for experimental methods to isolate electronic contributions. Measurements using noise thermometers and linear and nonlinear thermal transport reveal signatures of energy transport mediated by long-range interactions in one-dimensional electron systems.
NATURE NANOTECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Aditya Jayaraman, Kimberly Hsieh, Bhaskar Ghawri, Phanibhusan S. Mahapatra, Kenji Watanabe, Takashi Taniguchi, Arindam Ghosh
Summary: Resolving low-energy features in the density of states (DOS) is crucial for understanding rich novel phenomena in graphene-based 2D heterostructures. Through investigating thermoelectric power, effective probing of fine changes in the DOS of bilayer graphene (BLG) was demonstrated, revealing additional entropy features near the charge neutrality point (CNP) in gapped BLG. This apparent violation of the Mott formula can be quantitatively explained by considering the effects of trigonal warping, possibly serving as evidence for a Lifshitz transition.
Article
Multidisciplinary Sciences
Yong Wang, Pengju Ren, Jingting Hu, Yunchuan Tu, Zhongmiao Gong, Yi Cui, Yanping Zheng, Mingshu Chen, Wujun Zhang, Chao Ma, Liang Yu, Fan Yang, Ye Wang, Xinhe Bao, Dehui Deng
Summary: A unique structure design of Pt isolated by graphene was reported for efficient catalytic CO oxidation in an oxygen-rich atmosphere, achieving nearly 100% CO conversion at room temperature. This catalyst showed distinct behavior from classical metal-metal oxide interfaces and provided a new direction for the design of heterogeneous catalysts.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Ding-Rui Chen, I-Fan Hu, Hao-Ting Chin, Yu-Chi Yao, Radha Raman, Mario Hofmann, Chi-Te Liang, Ya-Ping Hsieh
Summary: This article investigates the potential of strain engineering to enhance the performance of 2D material-based resonators. By utilizing a liquid-based tension process, the resonance frequency and quality factor of graphene resonators can be improved six-fold. The study reveals that the enhanced wall interaction due to surface energy is the origin of this effect.
NANOSCALE HORIZONS
(2023)
Article
Chemistry, Physical
Nils Wittemeier, Matthieu J. Verstraete, Pablo Ordejon, Zeila Zanolli
Summary: Interference effects in finite sections of one-dimensional moire crystals were investigated using a Landauer-Buttiker formalism within the tight-binding approximation. The study explains interlayer transport in double-wall carbon nanotubes and proposes a predictive model. Results show visible wave function interference at the mesoscale, which can be exploited for designing quantum electronic devices.
Article
Chemistry, Multidisciplinary
Quanfeng He, Lanping Zeng, Lianhuan Han, Matthew M. Sartin, Juan Peng, Jian-Feng Li, Alexander Oleinick, Irina Svir, Christian Amatore, Zhong-Qun Tian, Dongping Zhan
Summary: Studies have shown that the adsorption of atomic hydrogen on single layer graphene can effectively store hydrogen and is suitable for solutions involving hydrogen fuel cells for vehicles. Utilizing a Pt-electrocatalyzed spillover-surface diffusion-chemisorption mechanism, hydrogenation of graphene can be carried out under mild conditions, demonstrating high storage capacity and stability.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Guoying Bai, Haiyan Zhang
Summary: Understanding the influence of carbonaceous particle properties on ice nucleation is crucial for atmospheric science, but it remains a challenge due to the coupling effect of multiple properties. In this study, the effects of oxidation degree and size on ice nucleation efficiency were separately investigated using graphene oxide (GO) as the model. The results showed that decreasing oxidation degree increased ice nucleation efficiency by reducing the ice nucleation free energy barrier on the GO surface. Interestingly, despite the larger sizes of the chosen GO compared to critical ice nuclei, increasing GO size led to a decrease in ice nucleation efficiency, contradicting the common belief that the nucleation barrier is no longer affected by particle size when it exceeds the critical nucleus size.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Thi Thuy Nhung Nguyen, Stephen R. Power, Hrag Karakachian, Ulrich Starke, Christoph Tegenkamp
Summary: This study investigates the impact of edge and width variations of graphene nanoribbons on quantum confinement effects. The researchers found that regardless of the ribbon width, the band gaps near the edges of the nanoribbons are significantly reduced, and edge passivation plays a crucial role in determining the local electronic properties of epitaxial nanoribbons.
Article
Chemistry, Multidisciplinary
Guorui Chen, Ya-Hui Zhang, Aaron Sharpe, Zuocheng Zhang, Shaoxin Wang, Lili Jiang, Bosai Lyu, Hongyuan Li, Kenji Watanabe, Takashi Taniguchi, Zhiwen Shi, David Goldhaber-Gordon, Yuanbo Zhang, Feng Wang
Summary: We report the observation of magnetic field-stabilized Wigner crystal states in ABC-stacked trilayer graphene on boron nitride (ABC-TLG/hBN). Correlated insulating states emerge at multiple fractional and integer fillings under a magnetic field. These insulating states can be attributed to generalized Mott states for integer fillings and generalized Wigner crystal states for fractional fillings. The nu = 2 insulating state persists up to 30 T and can be described by a Mott-Hofstadter transition at a high magnetic field.
Article
Physics, Multidisciplinary
Alex Gomez Salvador, Clemens Kuhlenkamp, Livio Ciorciaro, Michael Knap, Atac Imamoglu
Summary: This study analyzes the exciton band structure arising from the periodic modulation of the valley Zeeman effect and proposes detection schemes for magnetic order in quantum moire magnets and semiclassical moire magnets.
PHYSICAL REVIEW LETTERS
(2022)
