H
Helin Cao
Researcher at Purdue University
Publications - 52
Citations - 5062
Helin Cao is an academic researcher from Purdue University. The author has contributed to research in topics: Graphene & Topological insulator. The author has an hindex of 27, co-authored 51 publications receiving 4792 citations. Previous affiliations of Helin Cao include University of Washington.
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Control and characterization of individual grains and grain boundaries in graphene grown by chemical vapour deposition
Qingkai Yu,Qingkai Yu,Luis A. Jauregui,Wei Wu,Robert Colby,Jifa Tian,Zhihua Su,Helin Cao,Zhihong Liu,Deepak Pandey,Dongguang Wei,Ting-Fung Chung,Peng Peng,Nathan P. Guisinger,Eric A. Stach,Eric A. Stach,Jiming Bao,Shin-Shem Pei,Yong P. Chen +18 more
TL;DR: It is shown that grain boundaries give a significant Raman 'D' peak, impede electrical transport, and induce prominent weak localization indicative of intervalley scattering in graphene, opening a route towards scalable fabrication of single-crystal graphene devices without grain boundaries.
Journal ArticleDOI
Control and Characterization of Individual Grains and Grain Boundaries in Graphene Grown by Chemical Vapor Deposition
Qingkai Yu,Luis A. Jauregui,Wei Wu,Robert Colby,Jifa Tian,Zhihua Su,Helin Cao,Zhihong Liu,Deepak Pandey,Dongguang Wei,Ting-Fung Chung,Peng Peng,Nathan P. Guisinger,Eric A. Stach,Jiming Bao,Shin-Shem Pei,Yong P. Chen +16 more
TL;DR: In this paper, single-crystal graphene grains synthesized by ambient CVD on polycrystalline Cu are studied and individual boundaries between coalescing grains affect graphene's electronic properties.
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Wafer-scale synthesis of graphene by chemical vapor deposition and its application in hydrogen sensing
Wei Wu,Wei Wu,Zhihong Liu,Luis A. Jauregui,Qingkai Yu,Qingkai Yu,Rajeev Pillai,Helin Cao,Jiming Bao,Yong P. Chen,Shin-Shem Pei,Shin-Shem Pei +11 more
TL;DR: In this paper, the authors used a 4 mm × 3 mm size graphene film with a 1 nm palladium film deposited for hydrogen detection and showed high sensitivity, fast response and recovery, and can be used with multiple cycles.
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Electronic transport in chemical vapor deposited graphene synthesized on Cu: Quantum Hall effect and weak localization
Helin Cao,Qingkai Yu,Luis A. Jauregui,Jifa Tian,Wei Wu,Zhihong Liu,Romaneh Jalilian,Daniel K. Benjamin,Zhigang Jiang,Jiming Bao,Shin-Shem Pei,Yong P. Chen +11 more
TL;DR: In this article, the electronic properties of graphene synthesized by chemical vapor deposition (CVD) on copper then transferred to SiO2/Si were reported, showing ambipolar field effect (with on/off ratio ∼5 and carrier mobilities up to ∼3000 cm2/V
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Quantized Hall effect and Shubnikov-de Haas oscillations in highly doped Bi2Se3: evidence for layered transport of bulk carriers.
Helin Cao,Jifa Tian,Ireneusz Miotkowski,Tian Shen,Tian Shen,Jiuning Hu,Shan Qiao,Yong P. Chen +7 more
TL;DR: It is shown that the observed magnetotransport features do not come from the sample surface, but arise from the bulk of the sample acting as many parallel 2D electron systems to give a multilayered quantum Hall effect.