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Al-Hamry A, Pan Y, Rahaman M, Selyshchev O, Tegenkamp C, Zahn DRT, Pašti IA, Kanoun O. Toward Humidity-Independent Sensitive and Fast Response Temperature Sensors Based on Reduced Graphene Oxide/Poly(vinyl alcohol) Nanocomposites. ACS APPLIED ELECTRONIC MATERIALS 2024; 6:4718-4734. [PMID: 38947952 PMCID: PMC11210420 DOI: 10.1021/acsaelm.4c00729] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/23/2024] [Revised: 05/17/2024] [Accepted: 05/19/2024] [Indexed: 07/02/2024]
Abstract
Flexible temperature sensors are becoming increasingly important these days. In this work, we explore graphene oxide (GO)/poly(vinyl alcohol) (PVA) nanocomposites for potential application in temperature sensors. The influence of the mixing ratio of both materials, the reduction temperature, and passivation on the sensing performance has been investigated. Various spectroscopic techniques revealed the composite structure and atomic composition. These were complemented by semiempirical quantum chemical calculations to investigate rGO and PVA interaction. Scanning electron and atomic force microscopy measurements were carried out to evaluate dispersion and coated film quality. The temperature sensitivity has been evaluated for several composite materials with different compositions in the range from 10 to 80 °C. The results show that a linear temperature behavior can be realized based on rGO/PVA composites with temperature coefficients of resistance (TCR) larger than 1.8% K-1 and a fast response time of 0.3 s with minimal hysteresis. Furthermore, humidity influence has been investigated in the range from 10% to 80%, and a minor effect is shown. Therefore, we can conclude that rGO/PVA composites have a high potential for excellent passivation-free, humidity-independent, sensitive, and fast response temperature sensors for various applications. The GO reduction is tunable, and PVA improves the rGO/PVA sensor performance by increasing the tunneling effect and band gap energy, consequently improving temperature sensitivity. Additionally, PVA exhibits minimal water absorption, reducing the humidity sensitivity. rGO/PVA maintains its temperature sensitivity during and after several mechanical deformations.
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Affiliation(s)
- Ammar Al-Hamry
- Measurement
and Sensor Technology, Chemnitz University
of Technology, Reichenhainer Str. 70, 09126 Chemnitz, Germany
| | - Yang Pan
- Semiconductor
Physics, Chemnitz University of Technology, Reichenhainer Str. 70, 09126 Chemnitz, Germany
| | - Mahfujur Rahaman
- Semiconductor
Physics, Chemnitz University of Technology, Reichenhainer Str. 70, 09126 Chemnitz, Germany
| | - Oleksandr Selyshchev
- Semiconductor
Physics, Chemnitz University of Technology, Reichenhainer Str. 70, 09126 Chemnitz, Germany
| | - Christoph Tegenkamp
- Analysis
of Solid Surfaces, Chemnitz University of
Technology, Reichenhainer
Str. 70, 09126 Chemnitz, Germany
| | - Dietrich R. T. Zahn
- Semiconductor
Physics, Chemnitz University of Technology, Reichenhainer Str. 70, 09126 Chemnitz, Germany
| | - Igor A. Pašti
- Faculty
of Physical Chemistry, University of Belgrade, Studentski trg 12-16, 11158 Belgrade, Serbia
| | - Olfa Kanoun
- Measurement
and Sensor Technology, Chemnitz University
of Technology, Reichenhainer Str. 70, 09126 Chemnitz, Germany
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2
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Luo G, Yang Y, Zhu Y, Peng X, He L. Effect and mechanism analysis of surface hydrogenation and fluorination on the electronic properties of th-GeC 2. Phys Chem Chem Phys 2024; 26:14734-14744. [PMID: 38716669 DOI: 10.1039/d4cp00639a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/23/2024]
Abstract
A two-dimensional (2D) tetrahex-GeC2 nanosheet demonstrates excellent electronic properties such as a finite direct band gap and high carrier mobilities, as predicted from theoretical calculations. To further expand its potential applications, various strategies can be employed to tailor its electronic properties. These strategies include alloying, strain application, and edge and surface functionalization. This work specifically focuses on the impact of surface functionalization with hydrogen and fluorine adsorption on the 2D tetrahex-GeC2 nanostructures. It was discovered that the electronic properties of these nanostructures undergo significant alterations through surface functionalization by adjusting the adsorption sites and coverage of H/F species. The underlying mechanisms responsible for these property changes have been thoroughly analyzed and discussed in detail. Our calculations, based on density functional theory, reveal that the band gap of tetrahex-GeC2 widens as the surface coverage of H atoms increases. Conversely, the band gap narrows in the case of F adsorption. Additionally, the indirect-direct band gap transition can be triggered through surface functionalization. Such modifications in the electronic band structure are primarily due to the disappearance of the π bond when the C atom is converted from sp2 to sp3 hybridization through the adsorption of surface functionalized species. Furthermore, the results indicate that surface adsorption can regulate the effective mass of carriers, electron affinity, and work function in the 2D tetrahex-GeC2 nanostructure.
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Affiliation(s)
- Guihong Luo
- Department of Electronic Engineering, Xi'an University of Technology, Xi'an, Shaanxi, 710048, China.
| | - Ying Yang
- Department of Electronic Engineering, Xi'an University of Technology, Xi'an, Shaanxi, 710048, China.
| | - Yajie Zhu
- Department of Electronic Engineering, Xi'an University of Technology, Xi'an, Shaanxi, 710048, China.
| | - Xihong Peng
- College of Integrative Sciences and Arts, Arizona State University, Mesa, Arizona 85212, USA
| | - Li He
- Department of Electronic Engineering, Xi'an University of Technology, Xi'an, Shaanxi, 710048, China.
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3
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Chandra S, Yasin Y, Pouralimardan O, Majedi S, Azizi B, Jalali Sarvestani MR, Vessally E. Theoretical study on efficient HF gas sensing by functionalized, decorated, and doped nanocone strategy. J Mol Graph Model 2023; 124:108574. [PMID: 37540937 DOI: 10.1016/j.jmgm.2023.108574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 07/21/2023] [Accepted: 07/25/2023] [Indexed: 08/06/2023]
Abstract
Hydrogen fluoride (HF) is a highly dangerous and corrosive gas that can cause severe burns and respiratory damage. The density functional theory method (DFT) used to study the interaction between the HF gas and the surface of a carbon nanocone (CNC) doped with gallium atom as a chemical sensor. The results showed that CNC wasn't a good candidate to sense the HF gas and consequently its electrical properties are changed insignificant. To improve the properties of the CNC, several strategies were tried: functionalizing by pyridinol (Pyr) and pyridinol oxide (PyrO), decorated with metals (M = B, Al, and Ga), and doped with element of third group (M = B, Al, and Ga). The obtained data demonstrated that the promising results were obtained by doping the CNC with Ga atom. After full optimization, we achieved one stable configuration between the HF gas and CNC-Ga structure (S15 configuration) with Eads = -19.86 kcal/mol. The electronic properties of the CNC-Ga structure is sensible changed after the HF molecule is adsorbed. According to calculated the energy gap between HOMO and LUMO orbitals of S15 configuration are increased which could be applied a chemical signal. Eventually, one could propose that the CNC-Ga has the ability to act as a Φ-type sensor based on its physical adsorption energy and quick recovery time and doped with gallium atom is a promising strategy.
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Affiliation(s)
- Subhash Chandra
- Department of Electrical Engineering, GLA University, Mathura, 281406, India
| | - Yaser Yasin
- Medical Technical College, Al-Farahidi University, Iraq
| | | | - Soma Majedi
- Department of Medical Analysis, Faculty of Applied Science, Tishk International University, Erbil, Kurdistan Region, Iraq
| | - Bayan Azizi
- Medical Laboratory Sciences Department, College of Health Sciences, University of Human Development, Sulaymaniyah, Iraq
| | | | - Esmail Vessally
- Department of Chemistry, Payame Noor University, Tehran, Iran.
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4
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Lee HY, Haidari MM, Kee EH, Choi JS, Park BH, Campbell EEB, Jhang SH. Charge Transport in UV-Oxidized Graphene and Its Dependence on the Extent of Oxidation. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:2845. [PMID: 36014709 PMCID: PMC9415921 DOI: 10.3390/nano12162845] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 08/15/2022] [Accepted: 08/15/2022] [Indexed: 06/15/2023]
Abstract
Graphene oxides with different degrees of oxidation are prepared by controlling UV irradiation on graphene, and the charge transport and the evolution of the transport gap are investigated according to the extent of oxidation. With increasing oxygenous defect density nD, a transition from ballistic to diffusive conduction occurs at nD≃1012 cm-2 and the transport gap grows in proportion to nD. Considering the potential fluctuation related to the e-h puddle, the bandgap of graphene oxide is deduced to be Eg≃30nD(1012cm-2) meV. The temperature dependence of conductivity showed metal-insulator transitions at nD≃0.3×1012 cm-2, consistent with Ioffe-Regel criterion. For graphene oxides at nD≥4.9×1012 cm-2, analysis indicated charge transport occurred via 2D variable range hopping conduction between localized sp2 domain. Our work elucidates the transport mechanism at different extents of oxidation and supports the possibility of adjusting the bandgap with oxygen content.
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Affiliation(s)
- Hwa Yong Lee
- School of Physics, Konkuk University, Seoul 05029, Korea
| | | | - Eun Hee Kee
- School of Physics, Konkuk University, Seoul 05029, Korea
| | - Jin Sik Choi
- School of Physics, Konkuk University, Seoul 05029, Korea
| | - Bae Ho Park
- School of Physics, Konkuk University, Seoul 05029, Korea
| | - Eleanor E. B. Campbell
- EaStCHEM, School of Chemistry, Edinburgh University, David Brewster Road, Edinburgh EH9 3FJ, UK
| | - Sung Ho Jhang
- School of Physics, Konkuk University, Seoul 05029, Korea
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5
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Son J, Ryu H, Kwon J, Huang S, Yu J, Xu J, Watanabe K, Taniguchi T, Ji E, Lee S, Shin Y, Kim JH, Kim K, van der Zande AM, Lee GH. Tailoring Single- and Double-Sided Fluorination of Bilayer Graphene via Substrate Interactions. NANO LETTERS 2021; 21:891-898. [PMID: 33079559 DOI: 10.1021/acs.nanolett.0c03237] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
While many technologies rely on multilayer heterostructures, most of the studies on chemical functionalization have been limited to monolayer graphene. In order to use functionalization in multilayer systems, we must first understand the interlayer interactions between functionalized and nonfunctionalized (intact) layers and how to selectively functionalize one layer at a time. Here, we demonstrate a method to fabricate single- or double-sided fluorinated bilayer graphene (FBG) by tailoring substrate interactions. Both the top and bottom surfaces of bilayer graphene on the rough silicon dioxide (SiO2) are fluorinated; meanwhile, only the top surface of graphene on hexagonal boron nitride (hBN) is fluorinated. The functionalization type affects electronic properties; double-sided FBG on SiO2 is insulating, whereas single-sided FBG on hBN maintains conducting, showing that the intact bottom layer becomes electrically decoupled from the fluorinated top insulating layer. Our results define a straightforward method to selectively functionalize the top and bottom surfaces of bilayer graphene.
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Affiliation(s)
- Jangyup Son
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
- Department of Mechanical Science and Engineering, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, United States
- Functional Composite Materials Research Center, Korea Institute of Science and Technology (KIST), Jeonbuk 55324, Korea
| | - Huije Ryu
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
| | - Junyoung Kwon
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea
| | - Siyuan Huang
- Department of Mechanical Science and Engineering, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Jaehyung Yu
- Department of Mechanical Science and Engineering, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Jingwei Xu
- Department of Mechanical Science and Engineering, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Kenji Watanabe
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), Ibaraki 305-0044, Japan
| | - Takashi Taniguchi
- International Center for Materials Nanoarchitectonics, National Institute for Materials Science (NIMS), Ibaraki 305-0044, Japan
| | - Eunji Ji
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea
| | - Sol Lee
- Department of Physics, Yonsei University, Seoul 03722, Korea
| | - Yongjun Shin
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
| | - Jong Hun Kim
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
| | - Kwanpyo Kim
- Department of Physics, Yonsei University, Seoul 03722, Korea
| | - Arend M van der Zande
- Department of Mechanical Science and Engineering, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Gwan-Hyoung Lee
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
- Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul 08826, Korea
- Institute of Engineering Research, Seoul National University, Seoul 08826, Korea
- Institute of Applied Physics, Seoul National University, Seoul 08826, Korea
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6
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Arranz-Mascarós P, Godino-Salido ML, López-Garzón R, García-Gallarín C, Chamorro-Mena I, López-Garzón FJ, Fernández-García E, Gutiérrez-Valero MD. Non-covalent Functionalization of Graphene to Tune Its Band Gap and Stabilize Metal Nanoparticles on Its Surface. ACS OMEGA 2020; 5:18849-18861. [PMID: 32775887 PMCID: PMC7408210 DOI: 10.1021/acsomega.0c02006] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Accepted: 07/07/2020] [Indexed: 05/10/2023]
Abstract
Controlling graphene conductivity is crucial for its potential applications. With this focus, this paper shows the effect of the non-covalent bonding of a pyrimidine derivative (HIS) on the electronic properties of graphene (G). Several G-HIS hybrids are prepared through mild treatments keeping unaltered the structures of both G and HIS. The attachment of HIS to G occurs by π-π stacking of the HIS-aromatic residue with the G surface. This partially blocks the p z electrons of G, giving rise to the splitting of both the valence and conduction bands. Moreover, the width of the splitting is directly related to the HIS content. This fact allows the fine-tuning of the band gap of G-HIS hybrids. Furthermore, HIS keeps its metal-complexing ability in the G-HIS hybrids. Taking advantage of this, a G-HIS-Cu(0) composite was prepared by H2 plasma reduction of a precursor of the G-HIS-Cu(II) type. G-HIS-Cu(0) contains Cu(0) clusters stabilized on the G surface due to interactions with the COO- functions of HIS. In an analogous hybrid, G-HIS-Au(0), the Au(0) NPs are also stabilized by COO- functions. This material, consisting of the coupling of Au(0) NPs and G-HIS, photocatalyzed water reduction under visible light radiation producing 12.5 μmol·g-1·h-1of hydrogen.
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Affiliation(s)
- Paloma Arranz-Mascarós
- Department
of Inorganic and Organic Chemistry, Faculty of Experimental Sciences, Jaén University, 23071 Jaén, Spain
| | - Maria Luz Godino-Salido
- Department
of Inorganic and Organic Chemistry, Faculty of Experimental Sciences, Jaén University, 23071 Jaén, Spain
| | - Rafael López-Garzón
- Department
of Inorganic and Organic Chemistry, Faculty of Experimental Sciences, Jaén University, 23071 Jaén, Spain
| | - Celeste García-Gallarín
- Department
of Inorganic and Organic Chemistry, Faculty of Experimental Sciences, Jaén University, 23071 Jaén, Spain
| | - Ignacio Chamorro-Mena
- Department
of Inorganic and Organic Chemistry, Faculty of Experimental Sciences, Jaén University, 23071 Jaén, Spain
| | - F. Javier López-Garzón
- Department
of Inorganic Chemistry, Faculty of Sciences, Granada University, 18071 Granada, Spain
| | - Esperanza Fernández-García
- Department
of Inorganic and Organic Chemistry, Faculty of Experimental Sciences, Jaén University, 23071 Jaén, Spain
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7
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Molecular Interpretation of Pharmaceuticals’ Adsorption on Carbon Nanomaterials: Theory Meets Experiments. Processes (Basel) 2020. [DOI: 10.3390/pr8060642] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
The ability of carbon-based nanomaterials (CNM) to interact with a variety of pharmaceutical drugs can be exploited in many applications. In particular, they have been studied both as carriers for in vivo drug delivery and as sorbents for the treatment of water polluted by pharmaceuticals. In recent years, the large number of experimental studies was also assisted by computational work as a tool to provide understanding at molecular level of structural and thermodynamic aspects of adsorption processes. Quantum mechanical methods, especially based on density functional theory (DFT) and classical molecular dynamics (MD) simulations were mainly applied to study adsorption/release of various drugs. This review aims to compare results obtained by theory and experiments, focusing on the adsorption of three classes of compounds: (i) simple organic model molecules; (ii) antimicrobials; (iii) cytostatics. Generally, a good agreement between experimental data (e.g. energies of adsorption, spectroscopic properties, adsorption isotherms, type of interactions, emerged from this review) and theoretical results can be reached, provided that a selection of the correct level of theory is performed. Computational studies are shown to be a valuable tool for investigating such systems and ultimately provide useful insights to guide CNMs materials development and design.
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8
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Gheybi H, Sattari S, Soleimani K, Adeli M. Graphene-dendritic polymer hybrids: synthesis, properties, and applications. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2019. [DOI: 10.1007/s13738-019-01817-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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9
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Che S, Behura SK, Berry V. Photo-organometallic, Nanoparticle Nucleation on Graphene for Cascaded Doping. ACS NANO 2019; 13:12929-12938. [PMID: 31609585 DOI: 10.1021/acsnano.9b05484] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Controlling the doping levels in graphene by modifying the electric potential of interfaced nanostructures is important to understand "cascaded-doping"-based applications of graphene. However, graphene does not have active sites for nanoparticle attachment, and covalently adding functional groups on graphene disrupts its planar sp2-hybridization, affecting its cascaded doping. Here we show a hexahepto (η6) photo-organometallic chemistry to interface nanoparticles on graphene while retaining the sp2-hybridized state of carbon atoms. For testing cascaded doping with ethanol interaction, transition metal oxide nanoparticles (TMONs) (Cr2O3/CrO3, MoO3, and WO3) are attached on graphene. Here, the transition metal forms six σ-bonds and π-back-bonds with the benzenoid rings of graphene, while its opposite face binds to three carbonyl groups, which enable nucleation and growth of TMONs. With a radius size ranging from 50 to 100 nm, the TMONs downshift the Fermi level of graphene (-250 mV; p-doping) via interfacial charge transfer. This is consistent with the blue shift of graphene's G and 2D Raman modes with a hole density of 3.78 × 1012 cm-2. With susceptibility to ethanol, CrxO3 nanoparticles on graphene enable cascaded doping from ethanol that adsorbs on CrxO3, leading to doping of graphene to increase the electrical resistance of the TMONs-graphene hybrid. This nanoparticle-on-graphene construct can have several applications in gas/vapor sensing, electrochemical catalysis, and high-energy-density supercapacitors.
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Affiliation(s)
- Songwei Che
- Department of Chemical Engineering , University of Illinois at Chicago , 945 W. Taylor Street , Chicago , Illinois 60607 , United States
| | - Sanjay K Behura
- Department of Chemical Engineering , University of Illinois at Chicago , 945 W. Taylor Street , Chicago , Illinois 60607 , United States
| | - Vikas Berry
- Department of Chemical Engineering , University of Illinois at Chicago , 945 W. Taylor Street , Chicago , Illinois 60607 , United States
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10
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Zhukova MO, Hogan BT, Oparin EN, Shaban PS, Grachev YV, Kovalska E, Walsh KK, Craciun MF, Baldycheva A, Tcypkin AN. Transmission Properties of FeCl 3-Intercalated Graphene and WS 2 Thin Films for Terahertz Time-Domain Spectroscopy Applications. NANOSCALE RESEARCH LETTERS 2019; 14:225. [PMID: 31289955 PMCID: PMC6616562 DOI: 10.1186/s11671-019-3062-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Accepted: 06/24/2019] [Indexed: 05/30/2023]
Abstract
Time-resolved terahertz spectroscopy has become a common method both for fundamental and applied studies focused on improving the quality of human life. However, the issue of finding materials applicable in these systems is still relevant. One of the appropriate solution is 2D materials. Here, we demonstrate the transmission properties of unique graphene-based structures with iron trichloride FeCl3 dopant on glass, sapphire and Kapton polyimide film substrates that previously were not investigated in the framework of the above-described problems in near infrared and THz ranges. We also show properties of a thin tungsten disulfide WS2 film fabricated from liquid crystal solutions transferred to a polyimide and polyethylene terephthalate substrates. The introduction of impurities, the selection of structural dimensions and the use of an appropriate substrate for modified 2D layered materials allow to control the transmission of samples for both the terahertz and infrared ranges, which can be used for creation of effective modulators and components for THz spectroscopy systems.
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Affiliation(s)
- Maria O. Zhukova
- Laboratory of Femtosecond Optics and Femtotechnology, ITMO University, St. Petersburg, Russia
| | - Benjamin T. Hogan
- EPSRC Centre for Doctoral Training in Metamaterials, University of Exeter, Exeter, UK
| | - Egor N. Oparin
- Laboratory of Femtosecond Optics and Femtotechnology, ITMO University, St. Petersburg, Russia
| | - Polina S. Shaban
- Laboratory of Femtosecond Optics and Femtotechnology, ITMO University, St. Petersburg, Russia
| | - Yaroslav V. Grachev
- Laboratory of Femtosecond Optics and Femtotechnology, ITMO University, St. Petersburg, Russia
| | - Evgeniya Kovalska
- EPSRC Centre for Doctoral Training in Metamaterials, University of Exeter, Exeter, UK
| | - Kieran K. Walsh
- EPSRC Centre for Doctoral Training in Metamaterials, University of Exeter, Exeter, UK
| | - Monica F. Craciun
- EPSRC Centre for Doctoral Training in Metamaterials, University of Exeter, Exeter, UK
| | - Anna Baldycheva
- EPSRC Centre for Doctoral Training in Metamaterials, University of Exeter, Exeter, UK
| | - Anton N. Tcypkin
- Laboratory of Femtosecond Optics and Femtotechnology, ITMO University, St. Petersburg, Russia
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11
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Balog R, Cassidy A, Jørgensen J, Kyhl L, Andersen M, Čabo AG, Ravani F, Bignardi L, Lacovig P, Lizzit S, Hornekær L. Hydrogen interaction with graphene on Ir(1 1 1): a combined intercalation and functionalization study. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:085001. [PMID: 30628585 DOI: 10.1088/1361-648x/aaf76b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We demonstrate a procedure for obtaining a H-intercalated graphene layer that is found to be chemically decoupled from the underlying metal substrate. Using high-resolution x-ray photoelectron spectroscopy and scanning tunneling microscopy techniques, we reveal that the hydrogen intercalated graphene is p-doped by about 0.28 eV, but also identify structures of interfacial hydrogen. Furthermore, we investigate the reactivity of the decoupled layer towards atomic hydrogen and vibrationally excited molecular hydrogen and compare these results to the case of non-intercalated graphene. We find distinct differences between the two. Finally, we discuss the possibility to form graphane clusters on an iridium substrate by combined intercalation and H atom exposure experiments.
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Affiliation(s)
- Richard Balog
- Department of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C, Denmark
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12
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Bobenko NG, Egorushkin VE, Melnikova NV, Belosludtseva AA, Barkalov LD, Ponomarev AN. Low Temperature Characteristics of Electronic Density of States in Epitaxial Graphene. J STRUCT CHEM+ 2018. [DOI: 10.1134/s0022476618040157] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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13
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Neustroev EP, Nogovitsyna MV, Soloviev BD, Kurkina II, Nikolaev DV. The Impact of SF6 Plasma on the Properties of Graphene Oxide. J STRUCT CHEM+ 2018. [DOI: 10.1134/s0022476618040078] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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14
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De Sanctis A, Mehew JD, Craciun MF, Russo S. Graphene-Based Light Sensing: Fabrication, Characterisation, Physical Properties and Performance. MATERIALS 2018; 11:ma11091762. [PMID: 30231517 PMCID: PMC6163333 DOI: 10.3390/ma11091762] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Revised: 09/12/2018] [Accepted: 09/13/2018] [Indexed: 12/18/2022]
Abstract
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 commercial devices. Such challenges include the limited linear dynamic range (LDR) of graphene-based photodetectors, the lack of efficient generation and extraction of photoexcited charges, the smearing of photoactive junctions due to hot-carriers effects, large-scale fabrication and ultimately the environmental stability of the constituent materials. In order to overcome the aforementioned limits, different approaches to tune the properties of graphene have been explored. A new class of graphene-based devices has emerged where chemical functionalisation, hybridisation with light-sensitising materials and the formation of heterostructures with other 2D materials have led to improved performance, stability or versatility. For example, intercalation of graphene with FeCl 3 is highly stable in ambient conditions and can be used to define photo-active junctions characterized by an unprecedented LDR while graphene oxide (GO) is a very scalable and versatile material which supports the photodetection from UV to THz frequencies. Nanoparticles and quantum dots have been used to enhance the absorption of pristine graphene and to enable high gain thanks to the photogating effect. In the same way, hybrid detectors made from stacked sequences of graphene and layered transition-metal dichalcogenides enabled a class of devices with high gain and responsivity. In this work, we will review the performance and advances in functionalised graphene and hybrid photodetectors, with particular focus on the physical mechanisms governing the photoresponse, the performance and possible future paths of investigation.
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Affiliation(s)
- Adolfo De Sanctis
- Centre for Graphene Science, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QL, UK.
| | - Jake D Mehew
- Centre for Graphene Science, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QL, UK.
| | - Monica F Craciun
- Centre for Graphene Science, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QL, UK.
| | - Saverio Russo
- Centre for Graphene Science, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QL, UK.
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15
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Kim CH. Nanostructured Graphene: An Active Component in Optoelectronic Devices. NANOMATERIALS 2018; 8:nano8050328. [PMID: 29757992 PMCID: PMC5977342 DOI: 10.3390/nano8050328] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Revised: 05/11/2018] [Accepted: 05/12/2018] [Indexed: 01/09/2023]
Abstract
Nanostructured and chemically modified graphene-based nanomaterials possess intriguing properties for their incorporation as an active component in a wide spectrum of optoelectronic architectures. From a technological point of view, this aspect brings many new opportunities to the now well-known atomically thin carbon sheet, multiplying its application areas beyond transparent electrodes. This article gives an overview of fundamental concepts, theoretical backgrounds, design principles, technological implications, and recent advances in semiconductor devices that integrate nanostructured graphene materials into their active region. Starting from the unique electronic nature of graphene, a physical understanding of finite-size effects, non-idealities, and functionalizing mechanisms is established. This is followed by the conceptualization of hybridized films, addressing how the insertion of graphene can modulate or improve material properties. Importantly, it provides general guidelines for designing new materials and devices with specific characteristics. Next, a number of notable devices found in the literature are highlighted. It provides practical information on material preparation, device fabrication, and optimization for high-performance optoelectronics with a graphene hybrid channel. Finally, concluding remarks are made with the summary of the current status, scientific issues, and meaningful approaches to realizing next-generation technologies.
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Affiliation(s)
- Chang-Hyun Kim
- Department of Electronic Engineering, Gachon University, Seongnam 13120, Korea.
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16
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De Sanctis A, Russo S, Craciun MF, Alexeev A, Barnes MD, Nagareddy VK, Wright CD. New routes to the functionalization patterning and manufacture of graphene-based materials for biomedical applications. Interface Focus 2018; 8:20170057. [PMID: 29696089 DOI: 10.1098/rsfs.2017.0057] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/31/2018] [Indexed: 12/17/2022] Open
Abstract
Graphene-based materials are being widely explored for a range of biomedical applications, from targeted drug delivery to biosensing, bioimaging and use for antibacterial treatments, to name but a few. In many such applications, it is not graphene itself that is used as the active agent, but one of its chemically functionalized forms. The type of chemical species used for functionalization will play a key role in determining the utility of any graphene-based device in any particular biomedical application, because this determines to a large part its physical, chemical, electrical and optical interactions. However, other factors will also be important in determining the eventual uptake of graphene-based biomedical technologies, in particular the ease and cost of manufacture of proposed device and system designs. In this work, we describe three novel routes for the chemical functionalization of graphene using oxygen, iron chloride and fluorine. We also introduce novel in situ methods for controlling and patterning such functionalization on the micro- and nanoscales. Our approaches are readily transferable to large-scale manufacturing, potentially paving the way for the eventual cost-effective production of functionalized graphene-based materials, devices and systems for a range of important biomedical applications.
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Affiliation(s)
- A De Sanctis
- Centre for Graphene Science, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, UK
| | - S Russo
- Centre for Graphene Science, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, UK
| | - M F Craciun
- Centre for Graphene Science, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, UK
| | - A Alexeev
- Centre for Graphene Science, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, UK
| | - M D Barnes
- Centre for Graphene Science, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, UK
| | - V K Nagareddy
- Centre for Graphene Science, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, UK
| | - C D Wright
- Centre for Graphene Science, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, UK
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17
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Sarno M, Rossi G, Cirillo C, Incarnato L. Cold Wall Chemical Vapor Deposition Graphene-Based Conductive Tunable Film Barrier. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.7b05281] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Maria Sarno
- Department of Industrial Engineering, University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy
- NANO_MATES Research Centre, University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy
| | - Gabriella Rossi
- Department of Industrial Engineering, University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy
| | - Claudia Cirillo
- Department of Industrial Engineering, University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy
- NANO_MATES Research Centre, University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy
| | - Loredana Incarnato
- Department of Industrial Engineering, University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy
- NANO_MATES Research Centre, University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy
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18
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M. Dieb T, Hou Z, Tsuda K. Structure prediction of boron-doped graphene by machine learning. J Chem Phys 2018; 148:241716. [DOI: 10.1063/1.5018065] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Affiliation(s)
- Thaer M. Dieb
- Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Japan
- National Institute for Materials Science (NIMS), Tsukuba, Japan
- RIKEN, Center for Advanced Intelligence Project, Tokyo, Japan
| | - Zhufeng Hou
- National Institute for Materials Science (NIMS), Tsukuba, Japan
| | - Koji Tsuda
- Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Japan
- National Institute for Materials Science (NIMS), Tsukuba, Japan
- RIKEN, Center for Advanced Intelligence Project, Tokyo, Japan
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19
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Buonocore F, Capasso A, Lisi N. An ab initio study of hydroxylated graphane. J Chem Phys 2017; 147:104705. [PMID: 28915759 DOI: 10.1063/1.4986858] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Graphene-based derivatives with covalent functionalization and well-defined stoichiometry are highly desirable in view of their application as functional surfaces. Here, we have evaluated by ab initio calculations the energy of formation and the phase diagram of hydroxylated graphane structures, i.e., fully functionalized graphene derivatives coordinated with -H and -OH groups. We compared these structures to different hydrogenated and non-hydrogenated graphene oxide derivatives, with high level of epoxide and hydroxyl groups functionalization. Based on our calculations, stable phases of hydroxylated graphane with low and high contents of hydrogen are demonstrated for high oxygen and hydrogen partial pressure, respectively. Stable phases of graphene oxide with a mixed carbon hybridization are also found. Notably, the synthesis of hydroxylated graphane has been recently reported in the literature.
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Affiliation(s)
| | - Andrea Capasso
- Istituto Italiano di Tecnologia, Graphene Labs, Via Morego 30, Genova 16163, Italy
| | - Nicola Lisi
- ENEA, Casaccia Research Centre, I-00123 Rome, Italy
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20
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Bueno RA, Martínez JI, Luccas RF, Del Árbol NR, Munuera C, Palacio I, Palomares FJ, Lauwaet K, Thakur S, Baranowski JM, Strupinski W, López MF, Mompean F, García-Hernández M, Martín-Gago JA. Highly selective covalent organic functionalization of epitaxial graphene. Nat Commun 2017; 8:15306. [PMID: 28480884 PMCID: PMC5424159 DOI: 10.1038/ncomms15306] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Accepted: 03/20/2017] [Indexed: 12/16/2022] Open
Abstract
Graphene functionalization with organics is expected to be an important step for the development of graphene-based materials with tailored electronic properties. However, its high chemical inertness makes difficult a controlled and selective covalent functionalization, and most of the works performed up to the date report electrostatic molecular adsorption or unruly functionalization. We show hereafter a mechanism for promoting highly specific covalent bonding of any amino-terminated molecule and a description of the operating processes. We show, by different experimental techniques and theoretical methods, that the excess of charge at carbon dangling-bonds formed on single-atomic vacancies at the graphene surface induces enhanced reactivity towards a selective oxidation of the amino group and subsequent integration of the nitrogen within the graphene network. Remarkably, functionalized surfaces retain the electronic properties of pristine graphene. This study opens the door for development of graphene-based interfaces, as nano-bio-hybrid composites, fabrication of dielectrics, plasmonics or spintronics.
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Affiliation(s)
- Rebeca A Bueno
- Materials Science Factory, Instituto de Ciencia de Materiales de Madrid-CSIC, C/Sor Juana Inés de la Cruz 3, Madrid 28049, Spain
| | - José I Martínez
- Materials Science Factory, Instituto de Ciencia de Materiales de Madrid-CSIC, C/Sor Juana Inés de la Cruz 3, Madrid 28049, Spain
| | - Roberto F Luccas
- Materials Science Factory, Instituto de Ciencia de Materiales de Madrid-CSIC, C/Sor Juana Inés de la Cruz 3, Madrid 28049, Spain.,Instituto de Física Rosario-CONICET-UNR, Bv. 27 de Febrero 210bis, Rosario S2000EZP, Argentina
| | - Nerea Ruiz Del Árbol
- Materials Science Factory, Instituto de Ciencia de Materiales de Madrid-CSIC, C/Sor Juana Inés de la Cruz 3, Madrid 28049, Spain
| | - Carmen Munuera
- Materials Science Factory, Instituto de Ciencia de Materiales de Madrid-CSIC, C/Sor Juana Inés de la Cruz 3, Madrid 28049, Spain
| | - Irene Palacio
- Materials Science Factory, Instituto de Ciencia de Materiales de Madrid-CSIC, C/Sor Juana Inés de la Cruz 3, Madrid 28049, Spain
| | - Francisco J Palomares
- Materials Science Factory, Instituto de Ciencia de Materiales de Madrid-CSIC, C/Sor Juana Inés de la Cruz 3, Madrid 28049, Spain
| | - Koen Lauwaet
- Materials Science Factory, Instituto de Ciencia de Materiales de Madrid-CSIC, C/Sor Juana Inés de la Cruz 3, Madrid 28049, Spain
| | - Sangeeta Thakur
- Sincrotrone Trieste, strada Statale 14 - km 163, Basovizza 5 34149, Italy
| | - Jacek M Baranowski
- Institute of Electronic Materials Technology, Wolczynska 133, 01-919 Warsaw, Poland
| | - Wlodek Strupinski
- Institute of Electronic Materials Technology, Wolczynska 133, 01-919 Warsaw, Poland
| | - María F López
- Materials Science Factory, Instituto de Ciencia de Materiales de Madrid-CSIC, C/Sor Juana Inés de la Cruz 3, Madrid 28049, Spain
| | - Federico Mompean
- Materials Science Factory, Instituto de Ciencia de Materiales de Madrid-CSIC, C/Sor Juana Inés de la Cruz 3, Madrid 28049, Spain
| | - Mar García-Hernández
- Materials Science Factory, Instituto de Ciencia de Materiales de Madrid-CSIC, C/Sor Juana Inés de la Cruz 3, Madrid 28049, Spain
| | - José A Martín-Gago
- Materials Science Factory, Instituto de Ciencia de Materiales de Madrid-CSIC, C/Sor Juana Inés de la Cruz 3, Madrid 28049, Spain
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21
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De Sanctis A, Barnes MD, Amit I, Craciun MF, Russo S. Functionalised hexagonal-domain graphene for position-sensitive photodetectors. NANOTECHNOLOGY 2017; 28:124004. [PMID: 28233763 DOI: 10.1088/1361-6528/aa5ec0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Graphene's unique photoresponse has been largely used in a multitude of optoelectronics applications ranging from broadband photodetectors to wave-guide modulators. In this work we extend the range of applications to position-sensitive photodetectors (PSDs) using FeCl3-intercalated hexagonal domains of graphene grown by atmospheric pressure chemical vapour deposition (APCVD). The FeCl3-based chemical functionalisation of APCVD graphene crystals is affected by the presence of wrinkles and results in a non-uniform doping of the graphene layers. This doping profile creates multiple p-p+ photoactive junctions which show a linear and bipolar photoresponse with respect to the position of a focused light spot, which is ideal for the realization of a PSD. Our study paves the way towards the fabrication of flexible and transparent PSDs that could be embedded in smart textile and wearable electronics.
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Affiliation(s)
- Adolfo De Sanctis
- Centre for Graphene Science, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, United Kingdom
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22
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Lee WK, Hernández SC, Robinson JT, Walton SG, Sheehan PE. Fluorinated Graphene Enables the Growth of Inorganic Thin Films by Chemical Bath Deposition on Otherwise Inert Substrates. ACS APPLIED MATERIALS & INTERFACES 2017; 9:677-683. [PMID: 27977931 DOI: 10.1021/acsami.6b12440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Chemically modified graphenes (CMGs) offer a means to tune a wide variety of graphene's exceptional properties. Critically, CMGs can be transferred onto a variety of substrates, thereby imparting functionalities to those substrates that would not be obtainable through conventional functionalization. One such application of CMGs is enabling and controlling the subsequent growth of inorganic thin films. In the current study, we demonstrated that CMGs enhance the growth of inorganic films on inert surfaces with poor growth properties. Fluorinated graphene transferred onto polyethylene enabled the dense and homogeneous deposition of a cadmium sulfide (CdS) film grown via chemical bath deposition. We showed that the coverage of the CdS film can be controlled by the degree of fluorination from less than 20% to complete coverage of the film. The approach can also be applied to other technologically important materials such as ZnO. Finally, we demonstrated that electron beam-generated plasma in a SF6-containing background could pattern fluorine onto a graphene/PE sample to selectively grow CdS films on the fluorinated region. Therefore, CMG coatings can tailor the surface properties of polymers and control the growth of inorganic thin films on polymers for the development of flexible electronics.
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Affiliation(s)
- Woo-Kyung Lee
- Chemistry Division, ‡Plasma Physics Division, §Electronics Science and Technology Division, U.S. Naval Research Laboratory , Washington, D.C. 20375, United States
| | - Sandra C Hernández
- Chemistry Division, ‡Plasma Physics Division, §Electronics Science and Technology Division, U.S. Naval Research Laboratory , Washington, D.C. 20375, United States
| | - Jeremy T Robinson
- Chemistry Division, ‡Plasma Physics Division, §Electronics Science and Technology Division, U.S. Naval Research Laboratory , Washington, D.C. 20375, United States
| | - Scott G Walton
- Chemistry Division, ‡Plasma Physics Division, §Electronics Science and Technology Division, U.S. Naval Research Laboratory , Washington, D.C. 20375, United States
| | - Paul E Sheehan
- Chemistry Division, ‡Plasma Physics Division, §Electronics Science and Technology Division, U.S. Naval Research Laboratory , Washington, D.C. 20375, United States
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23
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Seehra MS, Narang V, Geddam UK, Stefaniak AB. Correlation between X-ray diffraction and Raman spectra of 16 commercial graphene-based materials and their resulting classification. CARBON 2017; 111:380-384. [PMID: 28690336 PMCID: PMC5497829 DOI: 10.1016/j.carbon.2016.10.010] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Structural properties of sixteen (16) commercial samples of graphene-based materials (GBM) labelled as graphene, graphene oxide or reduced graphene oxide are investigated at room temperature using X-ray diffraction (XRD) and Raman spectroscopy. Based on the observed correlation between the results obtained with these two techniques, these samples are classified into three groups: Group A of seven samples consisting of graphitic nanosheets with evaluated thickness ≃20 nm and exhibiting both the 2H and 3R phases in XRD; Group B of six samples exhibiting XRD spectra characteristic of either graphene oxides (GO) or carbons with some order; and Group C of three samples with XRD spectra characteristic of disordered carbons. The relative intensities and widths of D, G, D', 2D and (D + D') bands in the Raman spectra are equally distinguishable between the samples in groups A, B and C. The width of the D-band is the smallest for Group A samples, intermediate for group B and the largest for group C samples. The intensity ratio I(D)/I(G) of the D and G bands in the Raman spectra of the samples is used to quantify the Raman-active defects whose concentration increases in going from samples in Group A to those in Group C.
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Affiliation(s)
- Mohindar S. Seehra
- Department of Physics & Astronomy, West Virginia University, Morgantown, WV 26506, USA
| | - Vishal Narang
- Department of Physics & Astronomy, West Virginia University, Morgantown, WV 26506, USA
| | - Usha K. Geddam
- Department of Physics & Astronomy, West Virginia University, Morgantown, WV 26506, USA
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24
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Terms of endearment: Bacteria meet graphene nanosurfaces. Biomaterials 2016; 89:38-55. [DOI: 10.1016/j.biomaterials.2016.02.030] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2015] [Revised: 02/11/2016] [Accepted: 02/19/2016] [Indexed: 12/12/2022]
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25
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Van Tuan D, Roche S. Spin Manipulation in Graphene by Chemically Induced Pseudospin Polarization. PHYSICAL REVIEW LETTERS 2016; 116:106601. [PMID: 27015500 DOI: 10.1103/physrevlett.116.106601] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Indexed: 06/05/2023]
Abstract
Spin manipulation is one of the most critical challenges to realize spin-based logic devices and spintronic circuits. Graphene has been heralded as an ideal material to achieve spin manipulation, but so far new paradigms and demonstrators are limited. Here we show that certain impurities such as fluorine adatoms, which locally break sublattice symmetry without the formation of strong magnetic moment, could result in a remarkable variability of spin transport characteristics. The impurity resonance level is found to be associated with a long-range sublattice pseudospin polarization, which by locally decoupling spin and pseudospin dynamics provokes a huge spin lifetime electron-hole asymmetry. In the dilute impurity limit, spin lifetimes could be tuned electrostatically from 100 ps to several nanoseconds, providing a protocol to chemically engineer an unprecedented spin device functionality.
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Affiliation(s)
- Dinh Van Tuan
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193 Barcelona, Spain
| | - Stephan Roche
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193 Barcelona, Spain
- ICREA, Institució Catalana de Recerca i Estudis Avançats, 08070 Barcelona, Spain
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26
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Bhimanapati GR, Lin Z, Meunier V, Jung Y, Cha J, Das S, Xiao D, Son Y, Strano MS, Cooper VR, Liang L, Louie SG, Ringe E, Zhou W, Kim SS, Naik RR, Sumpter BG, Terrones H, Xia F, Wang Y, Zhu J, Akinwande D, Alem N, Schuller JA, Schaak RE, Terrones M, Robinson JA. Recent Advances in Two-Dimensional Materials beyond Graphene. ACS NANO 2015; 9:11509-39. [PMID: 26544756 DOI: 10.1021/acsnano.5b05556] [Citation(s) in RCA: 877] [Impact Index Per Article: 97.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The isolation of graphene in 2004 from graphite was a defining moment for the "birth" of a field: two-dimensional (2D) materials. In recent years, there has been a rapidly increasing number of papers focusing on non-graphene layered materials, including transition-metal dichalcogenides (TMDs), because of the new properties and applications that emerge upon 2D confinement. Here, we review significant recent advances and important new developments in 2D materials "beyond graphene". We provide insight into the theoretical modeling and understanding of the van der Waals (vdW) forces that hold together the 2D layers in bulk solids, as well as their excitonic properties and growth morphologies. Additionally, we highlight recent breakthroughs in TMD synthesis and characterization and discuss the newest families of 2D materials, including monoelement 2D materials (i.e., silicene, phosphorene, etc.) and transition metal carbide- and carbon nitride-based MXenes. We then discuss the doping and functionalization of 2D materials beyond graphene that enable device applications, followed by advances in electronic, optoelectronic, and magnetic devices and theory. Finally, we provide perspectives on the future of 2D materials beyond graphene.
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Affiliation(s)
- Ganesh R Bhimanapati
- Department of Materials Science and Engineering, Center for Two-Dimensional and Layered Materials, Pennsylvania State University , University Park, Pennsylvania 16802, United States
| | - Zhong Lin
- Department of Physics, Center for Two-Dimensional and Layered Materials, Pennsylvania State University , University Park, Pennsylvania 16802, United States
| | - Vincent Meunier
- Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute , Troy, New York 12180, United States
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Yeonwoong Jung
- Nanoscience Technology Center, Department of Materials Science and Engineering, University of Central Florida , Orlando, Florida 32826, United States
| | - Judy Cha
- Department of Mechanical Engineering and Material Science, Yale School of Engineering and Applied Sciences , New Haven, Connecticut 06520, United States
| | - Saptarshi Das
- Birck Nanotechnology Center & Department of ECE, Purdue University , West Lafayette, Indiana 47907, United States
| | - Di Xiao
- Department of Physics, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States
| | - Youngwoo Son
- Department of Chemical Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
| | - Michael S Strano
- Department of Chemical Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
| | - Valentino R Cooper
- Center for Nanophase Materials Sciences and Computer Science & Mathematics Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Liangbo Liang
- Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute , Troy, New York 12180, United States
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Steven G Louie
- Department of Physics, University of California at Berkeley , Berkeley, California 94720, United States
- Lawrence Berkeley National Lab , Berkeley, California 94720, United States
| | - Emilie Ringe
- Department of Materials Science & Nano Engineering, Rice University , Houston, Texas 77005, United States
| | - Wu Zhou
- Center for Nanophase Materials Sciences and Computer Science & Mathematics Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Steve S Kim
- Air Force Laboratory, Materials & Manufacturing directorate, Wright-Patterson AFB , Dayton, Ohio 45433, United States
- UES Inc. , Beavercreek, Ohio 45432, United States
| | - Rajesh R Naik
- Air Force Laboratory, Materials & Manufacturing directorate, Wright-Patterson AFB , Dayton, Ohio 45433, United States
| | - Bobby G Sumpter
- Center for Nanophase Materials Sciences and Computer Science & Mathematics Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Humberto Terrones
- Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute , Troy, New York 12180, United States
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Fengnian Xia
- Department of Electrical Engineering, Yale University , New Haven, Connecticut 06511, United States
| | - Yeliang Wang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China
| | - Jun Zhu
- Department of Physics, Center for Two-Dimensional and Layered Materials, Pennsylvania State University , University Park, Pennsylvania 16802, United States
| | - Deji Akinwande
- Microelectronics Research Centre, The University of Texas at Austin , Austin, Texas 78758, United States
| | - Nasim Alem
- Department of Materials Science and Engineering, Center for Two-Dimensional and Layered Materials, Pennsylvania State University , University Park, Pennsylvania 16802, United States
| | - Jon A Schuller
- Electrical and Computer Engineering Department, University of California at Santa Barbara , Santa Barbara, California 93106, United States
| | - Raymond E Schaak
- Department of Chemistry and Materials Research Institute, Pennsylvania State University , University Park, Pennsylvania 16802, United States
| | - Mauricio Terrones
- Department of Materials Science and Engineering, Center for Two-Dimensional and Layered Materials, Pennsylvania State University , University Park, Pennsylvania 16802, United States
- Department of Physics, Center for Two-Dimensional and Layered Materials, Pennsylvania State University , University Park, Pennsylvania 16802, United States
- Department of Chemistry and Materials Research Institute, Pennsylvania State University , University Park, Pennsylvania 16802, United States
| | - Joshua A Robinson
- Department of Materials Science and Engineering, Center for Two-Dimensional and Layered Materials, Pennsylvania State University , University Park, Pennsylvania 16802, United States
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27
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Seehra MS, Geddam UK, Schwegler-Berry D, Stefaniak AB. Detection and quantification of 2H and 3R phases in commercial graphene-based materials. CARBON 2015; 85:818-823. [PMID: 28316338 PMCID: PMC5354470 DOI: 10.1016/j.carbon.2015.08.109] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Graphene-based material (GBM) samples acquired from commercial sources are investigated using X-ray diffraction (XRD). Of the 18 GBM samples investigated here, seven samples show XRD patterns with features characteristic of the graphite structure. The XRD patterns of the seven samples are analyzed showing the presence of both the ABA (2H) structure and the ABCA (3R) structure. After de-convoluting the (101) lines of the 2H and 3R structures, the areas under the peaks are used to determine the relative concentrations of the 2H and 3R phases present, typically yielding the ratio 60/40 for 2H/3R. The presence of the 3R structure is important since the 3R structure is a semiconductor with tunable band gap and it is less stable than the 2H structure. The number of layers determined from the analysis of the XRD data varies between 65 and 109 for different samples yielding thickness of the graphite sheets varying between 22 nm and 37 nm. Scanning electron microscopy and transmission electron microscopy of three representative samples confirms the sheet-like morphology and stacking of the graphene layers in the samples. Relevance of these results in connection with their potential applications and toxicology is briefly discussed.
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Affiliation(s)
- Mohindar S. Seehra
- Department of Physics and Astronomy, West Virginia University, Morgantown, WV 26506, USA
| | - Usha K. Geddam
- Department of Physics and Astronomy, West Virginia University, Morgantown, WV 26506, USA
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28
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do Amaral Carminati S, Souza FL, Nogueira AF. Enhancing Hematite Photoanode Activity for Water Oxidation by Incorporation of Reduced Graphene Oxide. Chemphyschem 2015; 17:170-7. [DOI: 10.1002/cphc.201500659] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2015] [Indexed: 11/10/2022]
Affiliation(s)
- Saulo do Amaral Carminati
- Laboratório de Nanotecnologia e Energia Solar (LNES); Chemistry Institute; Universidade Estadual de Campinas; Campinas Brazil
| | - Flavio L. Souza
- Centro de Ciências Naturais e Humanas (CCNH); Universidade Federal do ABC; R.Santa Adélia, 166 Santo André Brazil
| | - Ana F. Nogueira
- Laboratório de Nanotecnologia e Energia Solar (LNES); Chemistry Institute; Universidade Estadual de Campinas; Campinas Brazil
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29
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Vatamanu J, Ni X, Liu F, Bedrov D. Tailoring graphene-based electrodes from semiconducting to metallic to increase the energy density in supercapacitors. NANOTECHNOLOGY 2015; 26:464001. [PMID: 26511198 DOI: 10.1088/0957-4484/26/46/464001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The semiconducting character of graphene and some carbon-based electrodes can lead to noticeably lower total capacitances and stored energy densities in electric double layer (EDL)capacitors. This paper discusses the chemical and electronic structure modifications that enhance the available energy bands, density of states and quantum capacitance of graphene substrates near the Fermi level, therefore restoring the conducting character of these materials. The doping of graphene with p or n dopants, such as boron and nitrogen atoms, or the introduction of vacancy defects that introduce zigzag edges, can significantly increase the quantum capacitance within the potential range of interest for the energy storage applications by either shifting the Dirac point away from the Fermi level or by eliminating the Dirac point. We show that a combination of doping and vacancies at realistic concentrations is sufficient to increase the capacitance of a graphene-based electrode to within 1 μF cm(−2) from that of a metallic surface.Using a combination of ab initio calculations and classical molecular dynamics simulations we estimate how the changes in the quantum capacitance of these electrode materials affect the total capacitance stored by the open structure EDL capacitors containing room temperature ionic liquid electrolytes.
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30
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Usachov DY, Fedorov AV, Petukhov AE, Vilkov OY, Rybkin AG, Otrokov MM, Arnau A, Chulkov EV, Yashina LV, Farjam M, Adamchuk VK, Senkovskiy BV, Laubschat C, Vyalikh DV. Epitaxial B-Graphene: Large-Scale Growth and Atomic Structure. ACS NANO 2015; 9:7314-7322. [PMID: 26121999 DOI: 10.1021/acsnano.5b02322] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Embedding foreign atoms or molecules in graphene has become the key approach in its functionalization and is intensively used for tuning its structural and electronic properties. Here, we present an efficient method based on chemical vapor deposition for large scale growth of boron-doped graphene (B-graphene) on Ni(111) and Co(0001) substrates using carborane molecules as the precursor. It is shown that up to 19 at. % of boron can be embedded in the graphene matrix and that a planar C-B sp(2) network is formed. It is resistant to air exposure and widely retains the electronic structure of graphene on metals. The large-scale and local structure of this material has been explored depending on boron content and substrate. By resolving individual impurities with scanning tunneling microscopy we have demonstrated the possibility for preferential substitution of carbon with boron in one of the graphene sublattices (unbalanced sublattice doping) at low doping level on the Ni(111) substrate. At high boron content the honeycomb lattice of B-graphene is strongly distorted, and therefore, it demonstrates no unballanced sublattice doping.
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Affiliation(s)
| | - Alexander V Fedorov
- †Saint Petersburg State University, 198504 St. Petersburg, Russia
- ‡II Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany
- §IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany
| | | | - Oleg Yu Vilkov
- †Saint Petersburg State University, 198504 St. Petersburg, Russia
| | - Artem G Rybkin
- †Saint Petersburg State University, 198504 St. Petersburg, Russia
| | - Mikhail M Otrokov
- ⊥Donostia International Physics Center (DIPC), Departamento de Fisica de Materiales and CFM-MPC UPV/EHU, 20080 San Sebastian, Spain
- ∥Tomsk State University, Lenina Av., 36, 634050 Tomsk, Russia
| | - Andrés Arnau
- ⊥Donostia International Physics Center (DIPC), Departamento de Fisica de Materiales and CFM-MPC UPV/EHU, 20080 San Sebastian, Spain
| | - Evgueni V Chulkov
- ⊥Donostia International Physics Center (DIPC), Departamento de Fisica de Materiales and CFM-MPC UPV/EHU, 20080 San Sebastian, Spain
- ∥Tomsk State University, Lenina Av., 36, 634050 Tomsk, Russia
| | - Lada V Yashina
- #M.V. Lomonosov Moscow State University, Leniskie Gory 1/3 199991 Moscow, Russia
| | - Mani Farjam
- ∇Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran, Iran
| | - Vera K Adamchuk
- †Saint Petersburg State University, 198504 St. Petersburg, Russia
| | - Boris V Senkovskiy
- †Saint Petersburg State University, 198504 St. Petersburg, Russia
- ⊗Institute of Solid State Physics, Dresden University of Technology, D-01062 Dresden, Germany
| | - Clemens Laubschat
- ⊗Institute of Solid State Physics, Dresden University of Technology, D-01062 Dresden, Germany
| | - Denis V Vyalikh
- †Saint Petersburg State University, 198504 St. Petersburg, Russia
- ⊥Donostia International Physics Center (DIPC), Departamento de Fisica de Materiales and CFM-MPC UPV/EHU, 20080 San Sebastian, Spain
- ⊗Institute of Solid State Physics, Dresden University of Technology, D-01062 Dresden, Germany
- ¶IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain
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31
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Neves AIS, Bointon TH, Melo LV, Russo S, de Schrijver I, Craciun MF, Alves H. Transparent conductive graphene textile fibers. Sci Rep 2015; 5:9866. [PMID: 25952133 PMCID: PMC4424659 DOI: 10.1038/srep09866] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Accepted: 03/03/2015] [Indexed: 11/09/2022] Open
Abstract
Transparent and flexible electrodes are widely used on a variety of substrates such as plastics and glass. Yet, to date, transparent electrodes on a textile substrate have not been explored. The exceptional electrical, mechanical and optical properties of monolayer graphene make it highly attractive as a transparent electrode for applications in wearable electronics. Here, we report the transfer of monolayer graphene, grown by chemical vapor deposition on copper foil, to fibers commonly used by the textile industry. The graphene-coated fibers have a sheet resistance as low as ~1 kΩ per square, an equivalent value to the one obtained by the same transfer process onto a Si substrate, with a reduction of only 2.3 per cent in optical transparency while keeping high stability under mechanical stress. With this approach, we successfully achieved the first example of a textile electrode, flexible and truly embedded in a yarn.
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Affiliation(s)
- A I S Neves
- 1] INESC-MN and IN, Rua Alves Redol nº9, 1000-029 Lisboa, Portugal [2] Centre for Graphene Science, College of Engineering, Mathematics &Physical Sciences, University of Exeter, EX4 4QL, United Kingdom
| | - T H Bointon
- Centre for Graphene Science, College of Engineering, Mathematics &Physical Sciences, University of Exeter, EX4 4QL, United Kingdom
| | - L V Melo
- 1] INESC-MN and IN, Rua Alves Redol nº9, 1000-029 Lisboa, Portugal [2] Physics Department, IST, University of Lisbon, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal
| | - S Russo
- Centre for Graphene Science, College of Engineering, Mathematics &Physical Sciences, University of Exeter, EX4 4QL, United Kingdom
| | - I de Schrijver
- CenTexBel, Technologiepark-Zwijnaarde 7, 9052 Gent, Belgium
| | - M F Craciun
- Centre for Graphene Science, College of Engineering, Mathematics &Physical Sciences, University of Exeter, EX4 4QL, United Kingdom
| | - H Alves
- 1] INESC-MN and IN, Rua Alves Redol nº9, 1000-029 Lisboa, Portugal [2] Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
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Lee WK, Whitener KE, Robinson JT, Sheehan PE. Patterning magnetic regions in hydrogenated graphene via e-beam irradiation. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2015; 27:1774-1778. [PMID: 25594531 DOI: 10.1002/adma.201404144] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2014] [Revised: 11/13/2014] [Indexed: 06/04/2023]
Abstract
Partially hydrogenated graphene is ferromagnetic and may be patterned by electron-beam irradiation. Sequential patterning produces a patterned magnetic array. Removal of the hydrogen atoms also can convert electrically insulating fully hydrogenated graphene back into conductive graphene, enabling the writing of chemically isolated, dehydrogenated graphene nanoribbons as narrow as 100 nm.
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Affiliation(s)
- Woo-Kyung Lee
- Chemistry Division, U.S. Naval Research Laboratory, 4555 Overlook Ave., SW, Washington, DC, 20375, USA
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33
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Unforeseen high temperature and humidity stability of FeCl3 intercalated few layer graphene. Sci Rep 2015; 5:7609. [PMID: 25567796 PMCID: PMC4286778 DOI: 10.1038/srep07609] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2014] [Accepted: 11/20/2014] [Indexed: 11/17/2022] Open
Abstract
We present the first systematic study of the stability of the structure and electrical properties of FeCl3 intercalated few-layer graphene to high levels of humidity and high temperature. Complementary experimental techniques such as electrical transport, high resolution transmission electron microscopy and Raman spectroscopy conclusively demonstrate the unforseen stability of this transparent conductor to a relative humidity up to 100% at room temperature for 25 days, to a temperature up to 150°C in atmosphere and to a temperature as high as 620°C in vacuum, that is more than twice higher than the temperature at which the intercalation is conducted. The stability of FeCl3 intercalated few-layer graphene together with its unique values of low square resistance and high optical transparency, makes this material an attractive transparent conductor in future flexible electronic applications.
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Abstract
By depositing a graphene layer on the metallic film with subwavelength hole arrays, the tunable extraordinary transmission property based on the metal-dielectrics-graphene (MDG) structure has been investigated in the terahertz (THz) and near-infrared (NIR) regimes. The influences of operation frequency, composed materials, and the Fermi level of the graphene layer have been taken into account. The results show that by varying the Fermi level of the graphene layer, the transmission of the MDG structure can be tuned in a wide range and the modulation depth of the peak value of the transmission can reach more than 50%. But the tunable mechanisms in the THz and NIR regimes are quite different. In the infrared (THz) regime, the graphene behaves like the dielectric (metallic) layer; its dielectric constant decreases (increases) with the increase of Fermi level, resulting in the transmission increasing (decreasing). Compared with the metallic structure, the transmission of the semiconductor structure can also be modulated by using the doping or varying temperature; its peak position can also be changed in a much broader range. The results are very useful to understand the mechanism of the graphene plasmonic devices and to design novel filters, switchers, modulators, and sensors.
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Affiliation(s)
- Xiaoyong He
- Mathematics & Science College, Shanghai Normal University, No. 100 Guilin Rd., Shanghai, 200234, People's Republic of China
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35
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Gowda P, Sakorikar T, Reddy SK, Ferry DB, Misra A. Defect-induced enhancement and quenching control of photocurrent in few-layer graphene photodetectors. ACS APPLIED MATERIALS & INTERFACES 2014; 6:7485-7490. [PMID: 24779774 DOI: 10.1021/am500865f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A novel approach is presented for achieving an enhanced photoresponse in a few layer graphene (FLG) based photodetector that is realized by introducing defect sites in the FLG. Fabrication induced wrinkle formation in graphene presented a four-fold enhancement in the photocurrent when compared to unfold FLG. Interestingly, it was observed that the addition of few multiwalled carbon nanotubes to an FLG improves the photocurrent by two-fold along with a highly stable response as compared to FLG alone.
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Affiliation(s)
- Prarthana Gowda
- Department of Instrumentation and Applied Physics, Indian Institute of Science , Bangalore, Karnataka 560012, India
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36
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Venter A, Hesari M, Ahmed MS, Bauld R, Workentin MS, Fanchini G. Facile nucleation of gold nanoparticles on graphene-based thin films from Au₁₄₄ molecular precursors. NANOTECHNOLOGY 2014; 25:135601. [PMID: 24583600 DOI: 10.1088/0957-4484/25/13/135601] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We demonstrate a facile and cost effective method to obtain gold nanoparticles on graphene by dispersing Au₁₄₄ molecular nanoclusters by spin coating them in thin layers on graphene-based films and subsequent annealing in a controlled atmosphere. The graphene-based thin films used for these experiments are prepared by solvent-assisted exfoliation of graphite in water in the presence of ribonucleic acid as a surfactant and by subsequent vacuum filtration of the resulting graphene-containing suspensions. Not only is this method easily reproducible, but it leads to gold nanoparticles that are not dependent in size on the number of graphene layers beneath them. This is a distinct advantage over other methods. Plasmonic effects have been detected in our gold nanoparticle-decorated graphene layers, indicating that these thin films may be useful in applications such as plasmonic solar cells and optical memory devices.
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Affiliation(s)
- Andrei Venter
- Department of Physics and Astronomy, University of Western Ontario, London, ON N6A 3K7, Canada
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37
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Garg R, Dutta NK, Choudhury NR. Work Function Engineering of Graphene. NANOMATERIALS 2014; 4:267-300. [PMID: 28344223 PMCID: PMC5304665 DOI: 10.3390/nano4020267] [Citation(s) in RCA: 87] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Revised: 03/06/2014] [Accepted: 03/18/2014] [Indexed: 11/17/2022]
Abstract
Graphene is a two dimensional one atom thick allotrope of carbon that displays unusual crystal structure, electronic characteristics, charge transport behavior, optical clarity, physical & mechanical properties, thermal conductivity and much more that is yet to be discovered. Consequently, it has generated unprecedented excitement in the scientific community; and is of great interest to wide ranging industries including semiconductor, optoelectronics and printed electronics. Graphene is considered to be a next-generation conducting material with a remarkable band-gap structure, and has the potential to replace traditional electrode materials in optoelectronic devices. It has also been identified as one of the most promising materials for post-silicon electronics. For many such applications, modulation of the electrical and optical properties, together with tuning the band gap and the resulting work function of zero band gap graphene are critical in achieving the desired properties and outcome. In understanding the importance, a number of strategies including various functionalization, doping and hybridization have recently been identified and explored to successfully alter the work function of graphene. In this review we primarily highlight the different ways of surface modification, which have been used to specifically modify the band gap of graphene and its work function. This article focuses on the most recent perspectives, current trends and gives some indication of future challenges and possibilities.
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Affiliation(s)
- Rajni Garg
- Ian Wark Research Institute, University of South Australia, Mawson Lakes Campus, 5095 Adelaide, Australia.
| | - Naba K Dutta
- Ian Wark Research Institute, University of South Australia, Mawson Lakes Campus, 5095 Adelaide, Australia.
| | - Namita Roy Choudhury
- Ian Wark Research Institute, University of South Australia, Mawson Lakes Campus, 5095 Adelaide, Australia.
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38
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Costa ALMT, Meunier V, Girão EC. Electronic transport in three-terminal triangular carbon nanopatches. NANOTECHNOLOGY 2014; 25:045706. [PMID: 24394719 DOI: 10.1088/0957-4484/25/4/045706] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The electronic transport properties of three-terminal graphene-based triangular patches are investigated using a combination of semi-empirical tight-binding calculations and Green's function-based transport theory within Landauer's framework. The junctions are composed of a triangular structure based on armchair edged graphene nanoribbons. We show how details of the central region influence the resonant electronic transport across the triangular patches and highlight the unique features of the current flow as a function of geometry. These properties indicate an array of functionalities for the development of carbon-based complex nanocircuits and operational devices at the nanoscale.
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