The role of hydrogen partial pressure on the annealing of copper substrates for graphene CVD synthesis

Ramos, Welyson T S; Cunha, Thiago Henrique Rodrigues da; Barcelos, Ingrid D.; Miquita, Douglas R.; Ferrari, Gustavo A.; Oliveira, Sabrynna Brito; Seara, Luciana Moreira; Neto, Eliel G. S.; Ferlauto, André S.; Lacerda, Rodrigo G.

doi:10.1088/2053-1591/3/4/045602

Cited by 22 publications

(12 citation statements)

References 18 publications

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“…Synthesis of graphene film with reduced defects can generate better results with complete impermeabilization. However, there was a great advance compared to other works reported in the literature 2,10,14,43 . Furthermore, the transfer PMMA acted as a protective layer for graphene during the permeation steps.…”

Section: Resultsmentioning

confidence: 94%

“…However, there was a great advance compared to other works reported in the literature. 2,10,14,43 Furthermore, the transfer PMMA acted as a protective layer for graphene during the permeation steps. In this sense, the use of graphene/PMMA thin film proved to be an efficient alternative for transfer.…”

Section: Gas Permeation Properties Of Pmma Support and Composite Membranesmentioning

confidence: 99%

“…Graphene is a carbon allotrope in a two‐dimensional planar (2D) configuration with a theoretical specific surface area of 2630 m 2 /g and monoatomic thickness. It is formed exclusively by carbon atoms covalently linked with hybrid sp 2 bonds in a hexagonal crystalline lattice 13,14 . The monolayer of graphene under ideal conditions ‐ free from defects and crystal lattice with nanopores of 0.34 nm ‐ is impervious even to helium gas atoms 15–17 .…”

Section: Introductionmentioning

confidence: 99%

“…It is formed exclusively by carbon atoms covalently linked with hybrid sp 2 bonds in a hexagonal crystalline lattice. 13,14 The monolayer of graphene under ideal conditions -free from defects and crystal lattice with nanopores of 0.34 nm -is impervious even to helium gas atoms. [15][16][17] However, molecules can diffuse through the monolayer if pores of controlled size are created or if there are intrinsic defects formed during the process of graphene synthesis or transfer.…”

Section: Introductionmentioning

confidence: 99%

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Chemical vapor deposition graphene transfer onto asymmetric PMMA support

Vivas

Flores

Jesus

et al. 2021

J of Applied Polymer Sci

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Graphene is a promising material for membrane applications. However, the graphene production with large specific area and good structural quality is a challenge. Therefore, the production and characterization of composite membranes with graphene grown by chemical vapor deposition (CVD) over a porous polymethylmethacrylate (PMMA) substrate was investigated. The experimental strategy consisted in applying CVD‐graphene on a PMMA surface using PMMA‐assisted graphene wet transfer. The proposed methodology resulted in large‐area membranes with 2 cm diameter. The samples were characterized by Raman spectroscopy, indicating the presence of graphene in good quality and relative structural integrity. The analysis by scanning electron microscopy revealed the formation of a microporous support with an asymmetric structure. The gas permeation measurements of graphene/PMMA membranes showed a permeability reduction of 81.9% for CO2 and 83.7% for N2. The contribution of PMMA to flow resistance was 2% and 11% for CO2 and N2, respectively, and the contribution of graphene was 98% and 89% for CO2 and N2. Therefore, this research presents a potential advance in transferring graphene to porous support, and the impermeability process of membranes composed of graphene/PMMA, a fundamental step for the development of graphene membranes before the production of controlled‐sized pores.

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Section: Resultsmentioning

confidence: 94%

Section: Gas Permeation Properties Of Pmma Support and Composite Membranesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Chemical vapor deposition graphene transfer onto asymmetric PMMA support

Vivas

Flores

Jesus

et al. 2021

J of Applied Polymer Sci

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“…Hence, hydrogen was selected to reduce the copper oxide present in the electroplated copper and at the same time anneal it at a higher temperature to enlarge its grain size [153]. However, it has also been reported that at higher temperatures the diffusivity of hydrogen inside Cu is very high, leading to hydrogen inclusion inside Cu voids [154][155][156]. Therefore, it was decided to use a lower temperature for our anneal treatment in a hydrogen-rich ambient.…”

Section: Electrical Characterization Of Har Micro-coilssmentioning

confidence: 99%

Design and fabrication of micro-coils for NMR micro probes

Mohammed¹

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A thesis submitted in fulfillment of the requirements for the degree of Doctor of Philosophy in Electrical and Electronic Engineering 2018 Acknowledgment I would like to offer sincere gratitude to my two wonderful supervisors-Prof. Poenar Daniel Puiu & Prof. Sheel Aditya. Thanks Prof. Daniel for admitting me into your research group, and for introducing me into the wonderful world of research and academics. You are an extremely supportive professor who have helped me throughout my PhD journey and have spent hours meticulously reading and editing my papers, reports and thesis. A huge thanks to Prof. Aditya for all your support and guidance throughout my PhD-helping me go through the funding crisis, constant motivation in getting my thesis done and helping me solving problems whenever I faced a roadblock. I would be eternally grateful to the staff members in Nanyang Nano-fabrication center for getting me trained in the cleanroom equipments and helping me with their experienced advices to get micro-fabrication of my devices done. I would like to thank Dr. Gang Yih, Xiaohong, Ling Ling, Kwok Fai, Shamsul, Zul, Rex, Clarence, Mak, and Irene for their constant support and helpful advices without whom this thesis wouldn't have been possible. I would like to thank my colleague Dr. Xia Xin for his valued advices on microfabrication and Dr. Wang Shaomeng & Dr. Zhao Chen for their guidance in CST modeling and simulations. I would also thankful to members of my thesis advisory committee Prof. Zheng Yuanjin and Dr. Alex Gu for their recommendations and suggestions to shape my thesis work throughout my PhD journey. My PhD journey wouldn't have been complete without the constant support of my friends. Special thanks Soumya, Subhrajit, Binit da, Avishek, Subrata and Sumanta for their love and support for all these years. I would also like to thank

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Quasistatic Equilibrium Chemical Vapor Deposition of Graphene

Ullah

Yang

et al. 2021

Adv Materials Inter

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This study reviews the majorly used chemical vapor deposition (CVD) with a focus on confined reaction configurations in which quasistatic equilibrium conditions are obtained for the fabrication of graphene with large size and high quality through controlled nucleation density, feedstock flux, and growth rates. The confinement configurations can also be used to tune the thickness, domain size and shape, and stacking order of the synthetic graphene. The confined CVD reaction configurations discussed include enclosure systems, inner‐tube setups, sandwiched substrates, as well as other types of configurations. The advantages and limitations of the different confinement configurations are presented, along ways to optimize the operational parameters for them.

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The role of hydrogen partial pressure on the annealing of copper substrates for graphene CVD synthesis

Cited by 22 publications

References 18 publications

Chemical vapor deposition graphene transfer onto asymmetric PMMA support

Chemical vapor deposition graphene transfer onto asymmetric PMMA support

Design and fabrication of micro-coils for NMR micro probes

Quasistatic Equilibrium Chemical Vapor Deposition of Graphene

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