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The nucleation of graphene on a transition metal (TM) surface, either on a terrace or near a step edge, is systematically explored using density functional theory (DFT) calculations and applying the two-dimensional (2D) crystal nucleation…

材料科学 · 物理学 2011-04-04 Junfeng Gao , Joanne Yip , Jijun Zhao , Boris I. Yakobson , Feng Ding

Graphyne is a planar two-dimensional carbon allotrope formed by atoms in sp, sp2, and sp3 hybridized states. Topologically graphyne nanotubes (GNTs) can be considered as cylindrically rolled up graphyne sheets, similarly as carbon nanotubes…

介观与纳米尺度物理 · 物理学 2015-09-30 Jose M. de Sousa , Gustavo Brunetto , Vitor R. Coluci , Douglas S. Galvao

A significant advance toward achieving practical applications of graphene as a two-dimensional material in nanoelectronics would be provided by successful synthesis of both n-type and p-type doped graphene. However reliable doping and a…

The evolution of dynamic processes in graphene-family materials are of great interest for both scientific purposes and technical applications. Scanning electron microscopy and transmission electron microscopy outstand among the techniques…

Graphene nanoplatelets (GnPs) are promising candidates for gas sensing applications because they have a high surface area to volume ratio, high conductivity, and a high temperature stability. Also, they cost less to synthesize, and they are…

Pt electrocatalytic nanoparticles were deposited onto hybrid carriers composed of reduced graphene oxide (rGO)-transition metal hexacyanoferrate (Prussian Blue-PB) and the resulting system's electrochemical activity was investigated during…

Graphene and carbon nanotubes (CNTs) share the same atomic structure of hexagonal carbon lattice. Yet, their synthesis differs in many aspects, including the shape and size of the catalyst. Here, we demonstrate a floating-catalyst chemical…

Recent progress in porous carbon materials has highlighted the importance of structural design in controlling emergent physicochemical properties. In this context, hydrogen-substituted graphdiyne (HsGDY), a three-dimensional framework…

Graphene and graphene-based materials exhibit exceptional optical and electrical properties with great promise for novel applications in light detection. However, several challenges prevent the full exploitation of these properties in…

材料科学 · 物理学 2018-09-20 Adolfo De Sanctis , Jake D. Mehew , Monica F. Craciun , Saverio Russo

Graphene is one of the most important materials in science today due to its unique and remarkable electronic, thermal and mechanical properties. However in its pristine state, graphene is a gapless semiconductor, what limits its use in…

材料科学 · 物理学 2014-08-13 P. A. S. Autreto , J. M. de Sousa , D. S. Galvao

To achieve high thermal conductivity (k) of polymer graphene nanocomposites, it is critically important to achieve efficient thermal coupling between graphene and its surrounding polymers through effective functionalization schemes. In this…

Designing new 2D systems with tunable properties is an important subject for science and technology. Starting from graphene, we developed an algorithm to systematically generate 2D carbon crystals belonging to the family of graphdiynes…

材料科学 · 物理学 2021-03-25 Patrick Serafini , Alberto Milani , Davide M. Proserpio , Carlo S. Casari

The widely used crystal structures for both heptazine-based and triazine-based two-dimensional (2D) graphitic carbon nitride (g-C$_3$N$_4$) are the flat P-6m2 configurations. However, the experimentally synthesized 2D g-C$_3$N$_4$ possess…

材料科学 · 物理学 2021-02-03 Luneng zhao , Xizhi Shi , Jin Li , Tao Ouyang , Chunxiao Zhang , Chao Tang , Chaoyu He , Jianxin Zhong

Graphene has recently been shown to be permeable to thermal protons, the nuclei of hydrogen atoms, which sparked interest in its use as a proton-conducting membrane in relevant technologies. However, the influence of light on proton…

Graphene-oxide hybrid structures offer the opportunity to combine the versatile functionalities of oxides with the excellent electronic transport in graphene. Understanding and controlling how the dielectric environment affects the…

介观与纳米尺度物理 · 物理学 2012-07-26 X. Hong , K. Zou , A. M. DaSilva , C. H. Ahn , J. Zhu

We demonstrate a substrate-supported thermometry platform to measure thermal conduction in nanomaterials like graphene, with no need to suspend them. We use three-dimensional simulations and careful uncertainty analysis to optimize the…

材料科学 · 物理学 2014-07-24 Zuanyi Li , Myung-Ho Bae , Eric Pop

The search for carbon-based materials with tailored dimensionality and properties remains an important topic in materials science, particularly for applications in electronics, photonics, and nanomechanics. Among the emerging platforms in…

介观与纳米尺度物理 · 物理学 2026-03-26 Djardiel da S. Gomes , Alexandre F. Fonseca , Marcelo L. Pereira

Atomically thin crystals have recently been the focus of attention in particular after the synthesis of graphene, a monolayer hexagonal crystal structure of carbon. In this novel material class the chemically derived graphenes have…

材料科学 · 物理学 2015-02-23 H. Sahin , O. Leenaerts , S. K. Singh , F. M. Peeters

Gallium nitride nanowire and nanorod substrates with different morphology are prospective platforms allowing to control the local strain distribution in graphene films top of them, resulting in an induction of pseudomagnetic fields. Atomic…

Hydrogen is one of the prime candidates for clean energy source with high energy density. However, current industrial methods of hydrogen production are difficult to provide hydrogen with high purity, thus hard to meet the requirements in…

应用物理 · 物理学 2021-07-06 Liliang Tian , Humin Duan , Jiaming Luo , Yonghong Cheng , Le Shi