Journal ArticleDOI
Electrical characterization of graphene films synthesized by low-temperature microwave plasma chemical vapor deposition
TLDR
In this paper, the authors discuss the results of Hall effect measurements to examine the electrical properties of the graphene films synthesized by low-temperature microwave plasma chemical vapor deposition and discuss the factors controlling the mobility and how to improve the quality of the graphite films by reducing the number of defects.Abstract:
In this Letter, we discuss the results of Hall effect measurements to examine the electrical properties of the graphene films synthesized by low-temperature microwave plasma chemical vapor deposition. Van der Pauw devices with sizes of 50–100 μm were fabricated, for which we observed p-type conduction and mobility from 10 to 100 cm2/V s. To investigate the mobility dispersion, we performed Raman mapping to quantify the number of defects and the disorder in graphene films. The results suggest that the D-band/G-band intensity ratio is correlated with the mobility. Moreover, we discuss the factors controlling the mobility and how to improve the quality of the graphene films by reducing the number of defects.read more
Citations
More filters
Journal ArticleDOI
Photo-and Electroluminescence from Nitrogen-Doped and Nitrogen–Sulfur Codoped Graphene Quantum Dots
Tanvir Hasan,Roberto Gonzalez-Rodriguez,Conor Ryan,Nicolas Faerber,Jeffery L. Coffer,Anton V. Naumov +5 more
Journal ArticleDOI
The emission wavelength dependent photoluminescence lifetime of the N-doped graphene quantum dots
Xingxia Deng,Xingxia Deng,Jing Sun,Siwei Yang,Hao Shen,Wei Zhou,Jian Lu,Guqiao Ding,Zhongyang Wang,Zhongyang Wang +9 more
TL;DR: In this article, aromatic nitrogen doped graphene quantum dots were investigated by steady-state and time-resolved photoluminescence (PL) techniques and the lifetime was found to be dependent on the emission wavelength and coincident with the PL spectrum.
Journal ArticleDOI
Quenching-Resistant Solid-State Photoluminescence of Graphene Quantum Dots: Reduction of pi-pi Stacking by Surface Functionalization with POSS, PEG, and HDA
Minsu Park,Yangho Jeong,Hyung Suk Kim,Woochan Lee,Sang-Hyeon Nam,Sukki Lee,Hyewon Yoon,Jin Kim,Seunghyup Yoo,Seokwoo Jeon +9 more
Journal ArticleDOI
Bilayer graphene synthesis by plasma treatment of copper foils without using a carbon-containing gas
TL;DR: Bilayer graphene has been synthesized by using hydrogen plasma treatment of copper foils for 30 seconds at the temperature of 850°C together with joule-heating treatment of the foils without using a carbon-containing gas such as methane in order to suppress the nucleation density of graphene as discussed by the authors.
Journal ArticleDOI
Synthesis and applications of large-area single-layer graphene
Xiao-Hong Lin,Jing-Gang Gai +1 more
TL;DR: In this paper, the progress in two categories of methods for preparing large-area graphene, namely chemical assembly of small graphene sheets and chemical vapor deposition method, are assessed and discussed, and the challenges for preparing high qualities and controllable layers and for transferring graphene film to various substrates with large area, clean, and low defect surface.
References
More filters
Journal ArticleDOI
Large-scale pattern growth of graphene films for stretchable transparent electrodes
Keun Soo Kim,Yue Zhao,Houk Jang,Sang Yoon Lee,Jong Min Kim,Kwang S. Kim,Jong Hyun Ahn,Philip Kim,Philip Kim,Jae-Young Choi,Byung Hee Hong +10 more
TL;DR: The direct synthesis of large-scale graphene films using chemical vapour deposition on thin nickel layers is reported, and two different methods of patterning the films and transferring them to arbitrary substrates are presented, implying that the quality of graphene grown by chemical vapours is as high as mechanically cleaved graphene.
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
Large Area, Few-Layer Graphene Films on Arbitrary Substrates by Chemical Vapor Deposition
Alfonso Reina,Xiaoting Jia,John T. Ho,Daniel Nezich,Hyungbin Son,Vladimir Bulovic,Mildred S. Dresselhaus,Jing Kong +7 more
TL;DR: The transparency, conductivity, and ambipolar transfer characteristics of the films suggest their potential as another materials candidate for electronics and opto-electronic applications.
Journal ArticleDOI
Transparent, Conductive Graphene Electrodes for Dye-Sensitized Solar Cells
TL;DR: Transparent, conductive, and ultrathin graphene films, as an alternative to the ubiquitously employed metal oxides window electrodes for solid-state dye-sensitized solar cells, are demonstrated and show high chemical and thermal stabilities and an ultrasmooth surface with tunable wettability.
Journal ArticleDOI
Evaluation of Solution-Processed Reduced Graphene Oxide Films as Transparent Conductors
TL;DR: These experiments demonstrate solution-processed GO films have potential as transparent electrodes and sheet resistance and optical transparency using different reduction treatments.