Article
Thermodynamics
Isaac M. Felix, Luiz Felipe C. Pereira
Summary: Semiconductor superlattices play a significant role in modern electronic devices, and the phonon heat transport is an important mechanism in this class of materials. This study reveals that coherent heat transport is suppressed for higher generations of quasiperiodic superlattices, leading to a decrease in thermal conductivity.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Xin Wu, Qiang Han
Summary: The study reveals the wave-particle crossover of phonon transport in the Graphene/h-BN vdW superlattice, and shows that increasing the interface density leads to a transition from the incoherent to coherent regime of phonon transport.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Multidisciplinary Sciences
Xingdan Sun, Shihao Zhang, Zhiyong Liu, Honglei Zhu, Jinqiang Huang, Kai Yuan, Zhenhua Wang, Kenji Watanabe, Takashi Taniguchi, Xiaoxi Li, Mengjian Zhu, Jinhai Mao, Teng Yang, Jun Kang, Jianpeng Liu, Yu Ye, Zheng Vitto Han, Zhidong Zhang
Summary: The formation of interfacial moire superlattices in van der Waals vertical assemblies reconstructs crystal symmetry and provides opportunities for investigating exotic quantum states. The alignment of graphene monolayer to both top and bottom encapsulating hexagonal boron nitride leads to observed conductivity minima and correlated insulating states in a weak-interaction regime. The alignment of three 2D nanosheets leads to the formation of super-moire atomic lattices, influencing the electronic properties of van der Waals structures.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Zhongyong Wang, Alexander D. Christodoulides, Lingyun Dai, Yang Zhou, Rui Dai, Yifei Xu, Qiong Nian, Junlan Wang, Jonathan A. Malen, Robert Y. Wang
Summary: Colloidal nanocrystal assemblies show promise for various applications, but using them in actual devices can be challenging. This study finds that colloidal PbS nanocrystal superlattices with long-range order have higher thermal conductivities and Young's moduli compared to comparatively disordered nanocrystal films. The improved properties are attributed to enhanced ligand-ligand interactions in the superlattices.
Article
Materials Science, Multidisciplinary
T. Ma, Y. Wang
Summary: In this study, the thermal conductivity of nanodevices was successfully modified by selecting appropriate heat baths without irreversible modifications to the device's structure or composition. Coherent baths that matched the phonon transmission spectrum of the device significantly increased its thermal conductivity.
MATERIALS TODAY PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Wenhao Sha, Xuan Dai, Siyu Chen, Fenglin Guo
Summary: This study explores the phonon thermal transport properties in graphene/h-BN superlattice monolayers using different methods and finds a transition from coherent to incoherent transport with increasing periodic length, as well as the existence of a minimum thermal conductivity.
DIAMOND AND RELATED MATERIALS
(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
Saumitran Kasturirangan, Alex Kamenev, Fiona J. Burnell
Summary: This study investigates the influence of (chiral) symmetry-preserving disorder on topological multicritical points. It finds that delocalized states with diverging localization length at zero energy exist, consistent with the W=1 critical point. The density of states (DOS) exhibits the universal Dyson singularity, while the critical exponent of the zero-energy localization length depends on the topological index W.
Article
Multidisciplinary Sciences
Xin Huang, Yangyu Guo, Yunhui Wu, Satoru Masubuchi, Kenji Watanabe, Takashi Taniguchi, Zhongwei Zhang, Sebastian Volz, Tomoki Machida, Masahiro Nomura
Summary: This study experimentally confirms the existence of phonon Poiseuille flow in graphitic systems, providing important insights into phonon hydrodynamics and advances in heat manipulation applications.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Su-Beom Song, Sangho Yoon, So Young Kim, Sera Yang, Seung-Young Seo, Soonyoung Cha, Hyeon-Woo Jeong, Kenji Watanabe, Takashi Taniguchi, Gil-Ho Lee, Jun Sung Kim, Moon-Ho Jo, Jonghwan Kim
Summary: This study demonstrates DUV electroluminescence and photocurrent generation in graphene/hBN/graphene heterostructures at room temperature. Tunneling carrier injection from graphene electrodes into the band edges of hBN enables prominent electroluminescence at DUV frequencies, while graphene electrodes efficiently collect photo-excited carriers in hBN under DUV laser illumination and external bias voltage, generating high photocurrent. Our work paves the way for efficient DUV light emitting and detection devices based on hBN.
NATURE COMMUNICATIONS
(2021)
Article
Thermodynamics
Xin Wu, Penghua Ying, Chunlei Li, Qiang Han
Summary: The wave-particle crossover of phonon transport in graphene/2D polyaniline lateral superlattices indicates a transition in the phonon transport mechanism from the incoherent to coherent regime. The thermal conductivity of the superlattice can be widely modulated due to the high structural similarity of polyaniline to graphene, surpassing other superlattices. The increase of interface density weakens thermal conductivity by increasing phonon-interface scattering while increasing it by lowering phonon transport barriers and allowing more long-wavelength phonons to participate in the transport.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Chemistry, Multidisciplinary
J. E. Gonzalez, Cesar G. Galvan, F. Salazar, M. Cruz-Irisson
Summary: Investigated the control of vibrational properties of ternary atomic ribbons with rock-salt structure by Fibonacci long-range mass disorder structure and found that Fibonacci structures can block the transmission of low-frequency phonons, resulting in a decrease in thermal conductivity.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Chemistry, Multidisciplinary
Michal Pawlak, Timo Kruck, Nikolai Spitzer, Dariusz Dziczek, Arne Ludwig, Andreas D. Wieck
Summary: This paper validates two theoretical formulas for characterizing thermal transport of superlattices, confirming the equivalence of heat capacity in very thin silicon membranes to bulk silicon within a specific temperature range. With the obtained thermal parameters, a new procedure is proposed to fully characterize the thermal transport properties of thin-layer and superlattice semiconductor samples in both in-plane and cross-plane directions.
APPLIED SCIENCES-BASEL
(2021)
Article
Physics, Multidisciplinary
Yibo Wang, Siqi Jiang, Jingkuan Xiao, Xiaofan Cai, Di Zhang, Ping Wang, Guodong Ma, Yaqing Han, Jiabei Huang, Kenji Watanabe, Takashi Taniguchi, Yanfeng Guo, Lei Wang, Alexander S. Mayorov, Geliang Yu
Summary: Van der Waals assembly of two-dimensional materials is a powerful tool for creating unique systems with properties not found in natural compounds. In this study, a ferroelectric semimetal made of double-gated double-layer graphene and atomically thin hexagonal boron nitride is demonstrated. The structure exhibits high room temperature mobility and ambipolar switching in response to an external electric field.
FRONTIERS OF PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Hiroki Oka, Mikito Koshino
Summary: In the study, the electronic structure of quasiperiodic double moire systems of graphene sandwiched by hexagonal boron nitride was calculated, revealing a fractal structure of mini energy gaps similar to the Hofstadter butterfly when plotted against twist angle. Each energy gap is characterized by a set of integers associated with a specific area in momentum space, geometrically interpreted as a quasi-Brillouin zone enclosed by multiple Bragg planes of composite periods.
Article
Materials Science, Multidisciplinary
Andre A. Marinho, Neymar P. Costa, Luiz Felipe C. Pereira, Francisco A. Brito, Carlos Chesman
JOURNAL OF MATERIALS SCIENCE
(2020)
Article
Materials Science, Multidisciplinary
Raphael M. Tromer, Isaac M. Felix, Aliliane Freitas, Sergio Azevedo, Luiz Felipe C. Pereira
COMPUTATIONAL MATERIALS SCIENCE
(2020)
Article
Physics, Multidisciplinary
Andre L. M. Vilela, Luiz Felipe C. Pereira, Laercio Dias, H. Eugene Stanley, Luciano R. da Silva
Summary: Opinion formation dynamics in society is complex, with algorithms filtering content for social network users coming under scrutiny. Introducing a visibility parameter in the majority-vote model can affect how individuals ignore their neighbors' opinions. Research shows that the visibility parameter increases the critical noise level, leading to dissent in the social network.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Luiz Felipe C. Pereira
Summary: Carbon is a versatile element that can form materials with different dimensionalities, such as nanotubes, graphene and diamond, all known for their exceptional physical properties. The relationship between mechanical strength and thermal conductivity is not always observed in carbon-based materials, highlighting the need for further exploration.
COMPUTATIONAL MATERIALS SCIENCE
(2021)
Article
Thermodynamics
Isaac M. Felix, Luiz Felipe C. Pereira
Summary: Semiconductor superlattices play a significant role in modern electronic devices, and the phonon heat transport is an important mechanism in this class of materials. This study reveals that coherent heat transport is suppressed for higher generations of quasiperiodic superlattices, leading to a decrease in thermal conductivity.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Physics, Applied
Raphael M. Tromer, Luiz Felipe C. Pereira, M. S. Ferreira, M. G. E. da Luz
Summary: In this paper, a simple heuristic method is proposed for obtaining the relaxation time and electrical conductivity dependence on the temperature of carriers in 2D semiconductors. The method is computationally efficient and can be used for analyzing 2D materials in thermoelectric applications.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Diego B. Fonseca, Luiz Felipe C. Pereira, Anderson L. R. Barbosa
Summary: In this paper, we propose an electronic Levy glass in graphene nanoribbons with circular electrostatic clusters. These clusters induce a transition from Levy to diffusive transport with increasing energy due to chiral symmetry breaking. Superdiffusive transport is exclusive to the low-energy quantum regime, while diffusive transport occurs in the semiclassical regime.
Article
Chemistry, Physical
R. M. Tromer, I. M. Felix, L. F. C. Pereira, M. G. E. da Luz, L. A. Ribeiro Junior, D. S. Galvao
Summary: In order to calculate the lattice thermal conductivity (LTC) of 2D nanomaterials, a simple, fast, and accurate semi-empirical approach was proposed. The approach avoids computationally expensive simulations by using parameterized thermochemical equations and Arrhenius-like fitting procedures. The obtained results are in good agreement with other theoretical and experimental estimations.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Physics, Fluids & Plasmas
Anderson L. R. Barbosa, Jonas R. F. Lima, Luiz Felipe C. Pereira
Summary: We investigate the propagation of waves in one-dimensional systems with Levy-type disorder. We find that nonrelativistic and relativistic waves exhibit anomalous localization when the potential barriers' width, separation, or both follow Levy distributions. Furthermore, in the case where both parameters follow a Levy distribution, nonrelativistic and relativistic waves undergo a transition from anomalous to standard localization as the incidence energy increases.
Article
Physics, Condensed Matter
Jose R. da Silva, Anderson L. R. Barbosa, Luiz Felipe C. Pereira
Summary: Graphene nanoribbons show remarkable electronic transport properties that can be controlled by modulating the electronic hopping. Quasiperiodic modulation creates a conductance gap and electronic localization in the nanoribbons. This finding expands the range of possible applications for graphene nanoribbons in nanoelectronic devices.
MICRO AND NANOSTRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Bohayra Mortazavi, Fazel Shojaei, Xiaoying Zhuang, Luiz Felipe C. Pereira
Summary: This study investigates the properties of pentadiamond through first-principles calculations, comparing it directly to diamond in terms of electronic structure, optical characteristics, mechanical response, and lattice thermal conductivity. The results show that pentadiamond has different absorption, elasticity, and thermal conductivity compared to diamond, suggesting both unique advantages and disadvantages in mechanical strength and heat conduction.
Article
Chemistry, Physical
Raphael M. Tromer, A. Freitas, Isaac M. Felix, Bohayra Mortazavi, L. D. Machado, S. Azevedo, Luiz Felipe C. Pereira
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2020)
Article
Chemistry, Physical
Jie Sheng, Jingshan He, Dun Ma, Yuanbo Wang, Wu Shao, Tian Ding, Ronghao Cen, Jingwen He, Zhihao Deng, Wenjun Wu
Summary: This study presents an innovative approach to improve the photovoltaic conversion characteristics and stability of perovskite solar cells through carbon electrode interface modification. By in-situ polymerization and carbonization on the surface of nano-graphite, a dendritic structure carbon electrode is formed, reducing the work function and aligning the energy levels with perovskite. This leads to improved charge and hole collection efficiency, resulting in increased photovoltaic conversion efficiency. Furthermore, the modified carbon electrode-based perovskite solar cells exhibit exceptional stability, maintaining high efficiency even without encapsulation.
Article
Chemistry, Physical
Guodong Shi, Jian Song, Xiaoxiao Tian, Tongtong Liu, Zhanjun Wu
Summary: This study demonstrates the improvement of mechanical properties and reduction of coefficient of thermal expansion (CTE) in graphene oxide (GO)/epoxy (EP) nanocomposites by enhancing the interface between GO and EP through functionalization and incorporating rigid-flexible interphases. The results reveal that the SiO2-PEA-GO hybrid exhibits better strengthening and toughening effects, as well as lower CTE, compared to the PEA-GO hybrid due to the presence of rigid-flexible interfaces with higher bonding strength and better energy dissipation mechanisms. Additionally, the nanocomposites with longer polyetheramine (PEA) molecules in the rigid-flexible interphases demonstrate higher strength and toughness, while maintaining a lower CTE. This work provides a promising strategy for constructing adjustable flexible-rigid interfacial structures and offers potential in developing GO/EP nanocomposites with high mechanical properties and low CTE.
Article
Chemistry, Physical
Rafal Janus, Sebastian Jarczewski, Jacek Jagiello, Piotr Natkanski, Mariusz Wadrzyk, Marek Lewandowski, Marek Michalik, Piotr Kustrowski
Summary: In this study, a facile procedure for the synthesis of CMK-1 and CMK-2 carbon replicas was developed. The method utilizes basic laboratory equipment and a renewable carbon source, and operates under mild conditions. The resulting carbon mesostructures exhibit exquisite replication fidelity and structural homogeneity, making them suitable for applications in various fields.
Article
Chemistry, Physical
Anqi Wang, Connor J. MacRobbie, Alex Baranovsky, Jean-Pierre Hickey, John Z. Wen
Summary: In this study, a novel polymer-free nanothermite aerogel with a wide range of nanoparticle loading was fabricated via a new additive manufacturing process. The SEM images showed a unique porous structure formed by extra thin rGO sheets, wrapping individual nanothermite clusters. The DSC-TGA results and high-speed combustion videos confirmed the enhanced energetic performance of the printed specimen.
Article
Chemistry, Physical
Wanze Wu, Misheng Zhao, Shiwei Miao, Xiaoyan Li, Yongzhong Wu, Xiao Gong, Hangxiang Wang
Summary: Superhydrophobic solar-driven interfacial evaporator is an energy-efficient technology for seawater desalination, which is easily fabricated using robust photothermal superhydrophobic coating and substrate. The created bifunctional coating on the melamine sponge substrate shows stable and highly efficient photothermal and superhydrophobic performance for seawater desalination. This superhydrophobic solar-driven interfacial evaporator is expected to have wide applications in seawater desalination.
Article
Chemistry, Physical
Zichen Xiang, Zhi Song, Tiansheng Wang, Menghang Feng, Yijing Zhao, Qitu Zhang, Yi Hou, Lixi Wang
Summary: This study presents a co-electrospinning synthesis strategy to fabricate lightweight and porous Co@C composite nanofibres with wideband microwave attenuation capacity. The addition of MOF-derived Co additives enhances the low-frequency absorption performance.
Article
Chemistry, Physical
J. Snow, C. Olson, E. Torres, K. Shirley, E. Cazalas
Summary: This study investigates the use of a perovskite-based graphene field effect transistor (P-GFET) device for X-ray detection. The sensitivity and responsivity of the device were found to be influenced by factors such as X-ray tube voltage, current, and source-drain voltage. Simulation experiments were conducted to determine the dose rate and energy incident on the device during irradiation.
Article
Chemistry, Physical
Zuzana Jankovska, Lenka Matejova, Jonas Tokarsky, Pavlina Peikertova, Milan Dopita, Karolina Gorzolkova, Dominika Habermannova, Michal Vastyl, Jakub Belik
Summary: This study provides new insights into microwave-assisted pyrolysis of scrap tyres, demonstrating that it can produce microporous carbon black with potential application in xylene adsorption. Compared to conventional pyrolysis, microwave pyrolysis requires less time and energy while maintaining similar adsorption capacity.
Article
Chemistry, Physical
Max Bommert, Bruno Schuler, Carlo A. Pignedoli, Roland Widmer, Oliver Groning
Summary: A detailed understanding of the interaction between molecules and two-dimensional materials is crucial for incorporating functional molecular films into next-generation 2D material-organic hybrid devices. This study compares the energy level alignment of different-sized fullerenes on a Moire superstructure and finds that C-84 fullerenes can be either neutral or negatively charged depending on slight variations of the electrostatic potential. This discovery suggests a new path to achieve ambipolar charge transfer without overcoming the electronic gap of fullerenes.
Article
Chemistry, Physical
Yuanjing Cheng, Xianxian Sun, Ye Yuan, Shuang Yang, Yuanhao Ning, Dan Wang, Weilong Yin, Yibin Li
Summary: The dual-structure aerogel (GS) consisting of flexible silica fibers and graphene honeycomb structures exhibits excellent resilience, flexibility, and reliability. It also shows remarkable wave absorbing performance, making it an ideal candidate for microwave absorption applications such as flexible electronics and aerospace.
Article
Chemistry, Physical
Shuyu Fan, Yinong Chen, Shu Xiao, Kejun Shi, Xinyu Meng, Songsheng Lin, Fenghua Su, Yifan Su, Paul K. Chu
Summary: Graphene coatings are promising solid lubrication materials due to their mechanical properties. This study presents a new method for in situ deposition of high-quality graphene coatings on hard substrates using NiCo solid solution and competitive reaction strategies. The graphene coating deposited on substrates with deep NiCo solid solution demonstrates superior low-friction and durability.
Article
Chemistry, Physical
Mengdi Wang, Sanyin Qu, Yanling Chen, Qin Yao, Lidong Chen
Summary: The improved thermoelectric properties of conducting polymers are achieved by selectively capturing single-walled carbon nanotubes (SWNTs) in a conducting polymer film, leading to increased carrier mobility and reduced thermal conductivity. The resulting composite film exhibits significantly higher electrical conductivity and lower thermal conductivity compared to films with a mixture of SWNTs. This work provides a convenient and efficient method to enhance the thermoelectric properties of conducting polymers.
Review
Chemistry, Physical
Heng Wei, Weihua Li, Kareem Bachagha
Summary: This article reviews the research progress of carbon nanotube-based microwave absorbing materials (MAMs) in recent years, covering the fundamental theory, design strategies, synthesis methods, and future development directions.
Article
Chemistry, Physical
Chenguang Shi, Junlong Huang, Zongheng Cen, Tan Yi, Shaohong Liu, Ruowen Fu
Summary: This study developed a high-performance Li metal host material, which achieved dendrite-free Li deposition with a low nucleation overpotential and high Coulombic efficiencies through the combination of Ti3C2-g-PV4P sheets and Ag nanoparticles. The full cells assembled with the Li@host anode and LiFePO4 cathode exhibited high discharge capacity and excellent cycling stability, demonstrating a perspective design for future energy storage devices.
Article
Chemistry, Physical
Tomotaro Mae, Kentaro Kaneko, Hiroki Sakurai, Suguru Noda
Summary: A new partial prelithiation method for SiO/C-CNT electrodes was developed, which showed reduced irreversible capacity and achieved high energy densities with good reversibility. The method allows for precise control of the degree of prelithiation and is applicable to various chemistries.