Journal ArticleDOI
Bimodal Phonon Scattering in Graphene Grain Boundaries.
Poya Yasaei,Arman Fathizadeh,Reza Hantehzadeh,Arnab K. Majee,Ahmed I El-Ghandour,David Estrada,Craig D. Foster,Zlatan Aksamija,Fatemeh Khalili-Araghi,Amin Salehi-Khojin +9 more
TLDR
A simultaneous comparison of thermal transport in supported single crystalline graphene to thermal transport across an individual graphene GB is reported, showing that thermal conductance through an isolated GB can be up to an order of magnitude lower than the theoretically anticipated values.Abstract:
Graphene has served as the model 2D system for over a decade, and the effects of grain boundaries (GBs) on its electrical and mechanical properties are very well investigated. However, no direct measurement of the correlation between thermal transport and graphene GBs has been reported. Here, we report a simultaneous comparison of thermal transport in supported single crystalline graphene to thermal transport across an individual graphene GB. Our experiments show that thermal conductance (per unit area) through an isolated GB can be up to an order of magnitude lower than the theoretically anticipated values. Our measurements are supported by Boltzmann transport modeling which uncovers a new bimodal phonon scattering phenomenon initiated by the GB structure. In this novel scattering mechanism, boundary roughness scattering dominates the phonon transport in low-mismatch GBs, while for higher mismatch angles there is an additional resistance caused by the formation of a disordered region at the GB. Nonequili...read more
Citations
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Fast parallel algorithms for short-range molecular dynamics
TL;DR: Comparing the results to the fastest reported vectorized Cray Y-MP and C90 algorithm shows that the current generation of parallel machines is competitive with conventional vector supercomputers even for small problems.
Journal ArticleDOI
Improvements on non-equilibrium and transport Green function techniques: The next-generation TRANSIESTA
Nick Rübner Papior,Nicolás Lorente,Thomas Frederiksen,Thomas Frederiksen,Alberto García,Mads Brandbyge +5 more
TL;DR: A flexible, next-generation DFT–NEGF code handles devices with one or multiple electrodes with individual chemical potentials and electronic temperatures, as well as the newly implemented algorithms for optimized and scalable matrix inversion, performance-critical pivoting, and hybrid parallelization.
Journal ArticleDOI
Stable and Selective Humidity Sensing Using Stacked Black Phosphorus Flakes.
Poya Yasaei,Amirhossein Behranginia,Tara Foroozan,Mohammad Asadi,Kibum Kim,Fatemeh Khalili-Araghi,Amin Salehi-Khojin +6 more
TL;DR: The sensing characteristics of BP films are explored and an ultrasensitive and selective response toward humid air with a trace-level detection capability and a very minor drift over time is observed.
Journal ArticleDOI
Toward Mass Production of CVD Graphene Films.
TL;DR: Recent progress toward the mass production of CVD graphene films is summarized, including the manufacturing process, equipment, and critical process parameters, which are crucial for quality control in mass production.
Journal ArticleDOI
Tailoring the thermal and electrical transport properties of graphene films by grain size engineering
Teng Ma,Zhibo Liu,Jinxiu Wen,Gao Yang,Xibiao Ren,Huanjun Chen,Chuanhong Jin,Xiuliang Ma,Ningsheng Xu,Hui-Ming Cheng,Wencai Ren +10 more
TL;DR: A segregation–adsorption chemical vapour deposition method to grow well-stitched high-quality monolayer graphene films with a tunable uniform grain size by using a Pt substrate with medium carbon solubility enables the determination of the scaling laws of thermal and electrical conductivities as a function of grain size.
References
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Journal ArticleDOI
Fast parallel algorithms for short-range molecular dynamics
TL;DR: In this article, three parallel algorithms for classical molecular dynamics are presented, which can be implemented on any distributed-memory parallel machine which allows for message-passing of data between independently executing processors.
Fast parallel algorithms for short-range molecular dynamics
TL;DR: Comparing the results to the fastest reported vectorized Cray Y-MP and C90 algorithm shows that the current generation of parallel machines is competitive with conventional vector supercomputers even for small problems.
Journal ArticleDOI
Superior Thermal Conductivity of Single-Layer Graphene
Alexander A. Balandin,Suchismita Ghosh,Wenzhong Bao,Irene Calizo,Desalegne Teweldebrhan,Feng Miao,Chun Ning Lau +6 more
TL;DR: The extremely high value of the thermal conductivity suggests that graphene can outperform carbon nanotubes in heat conduction and establishes graphene as an excellent material for thermal management.
Journal ArticleDOI
Roll-to-roll production of 30-inch graphene films for transparent electrodes
Sukang Bae,Hyeongkeun Kim,Youngbin Lee,Xiangfan Xu,Jaesung Park,Yi Zheng,Jayakumar Balakrishnan,Tian Lei,Hye Ri Kim,Young Il Song,Young Jin Kim,Kwang S. Kim,Barbaros Özyilmaz,Jong Hyun Ahn,Byung Hee Hong,Sumio Iijima,Sumio Iijima +16 more
TL;DR: The roll-to-roll production and wet-chemical doping of predominantly monolayer 30-inch graphene films grown by chemical vapour deposition onto flexible copper substrates are reported, showing high quality and sheet resistances superior to commercial transparent electrodes such as indium tin oxides.
Journal ArticleDOI
Raman spectroscopy as a versatile tool for studying the properties of graphene
Andrea C. Ferrari,Denis M. Basko +1 more
TL;DR: The state of the art, future directions and open questions in Raman spectroscopy of graphene are reviewed, and essential physical processes whose importance has only recently been recognized are described.