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AlSalem HS, Al-Goul ST, García-Miranda Ferrari A, Brownson DAC, Velarde L, Koehler SPK. Imaging the reactivity and width of graphene's boundary region. Chem Commun (Camb) 2020; 56:9612-9615. [PMID: 32776054 DOI: 10.1039/d0cc02675a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reactivity of graphene at its boundary region has been imaged using non-linear spectroscopy to address the controversy whether the terraces of graphene or its edges are more reactive. Graphene was functionalised with phenyl groups, and we subsequently scanned our vibrational sum-frequency generation setup from the functionalised graphene terraces across the edges. A greater phenyl signal is clearly observed at the edges, showing evidence of increased reactivity in the boundary region. We estimate an upper limit of 1 mm for the width of the CVD graphene boundary region.
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Affiliation(s)
- Huda S AlSalem
- School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK and School of Chemistry, Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia
| | - Soha T Al-Goul
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260-3000, USA and School of Chemistry, King Abdulaziz University, Rabigh, Saudi Arabia
| | - Alejandro García-Miranda Ferrari
- Department of Natural Sciences, Manchester Metropolitan University, Chester Street, Manchester, M1 5GD, UK. and Manchester Fuel Cell Innovation Centre, Manchester Metropolitan University, Manchester M1 5GD, UK
| | - Dale A C Brownson
- Department of Natural Sciences, Manchester Metropolitan University, Chester Street, Manchester, M1 5GD, UK. and Manchester Fuel Cell Innovation Centre, Manchester Metropolitan University, Manchester M1 5GD, UK
| | - Luis Velarde
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260-3000, USA
| | - Sven P K Koehler
- Department of Natural Sciences, Manchester Metropolitan University, Chester Street, Manchester, M1 5GD, UK.
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2
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Moreno V, Murtada K, Zougagh M, Ríos Á. Analytical control of Rhodamine B by SERS using reduced graphene decorated with copper selenide. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 223:117302. [PMID: 31260886 DOI: 10.1016/j.saa.2019.117302] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2019] [Revised: 06/20/2019] [Accepted: 06/21/2019] [Indexed: 05/11/2023]
Abstract
A novel approach for the decoration of reduced graphene oxide with copper selenide (CuSe-rGO), using supercritical carbon dioxide (sc-CO2) as a medium, was developed and proposed as a new substrate for surface-enhanced Raman spectroscopy (SERS) to determine Rhodamine B in chili powder. The synthesized materials graphene oxide (GO), reduced graphene oxide (rGO) and CuSe-rGO were characterized by Raman spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM). All SERS spectra were obtained by using a portable Raman spectrometer. The procedure presented involves a simple and rapid sample pretreatment in order to determine Rhodamine B in chili powder, with a limit of quantification of 44.5 ng g-1. The recovery values of the proposed method resulted in the 96% to 99% range, with RSD values from 2.4% to 3.0%. The developed SERS active hybrid substrate has an enhancement factor higher than those using gold or silver nanoparticles, providing a clear improvement in the sensitivity.
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Affiliation(s)
- Virginia Moreno
- Department of Analytical Chemistry and Food Technology, Faculty of Science and Chemical Technologies, University of Castilla-La Mancha, Ciudad Real 13071, Spain; Regional Institute for Applied Science Research (IRICA), Ciudad Real 13071, Spain
| | - Khaled Murtada
- Department of Analytical Chemistry and Food Technology, Faculty of Science and Chemical Technologies, University of Castilla-La Mancha, Ciudad Real 13071, Spain; Regional Institute for Applied Science Research (IRICA), Ciudad Real 13071, Spain
| | - Mohammed Zougagh
- Regional Institute for Applied Science Research (IRICA), Ciudad Real 13071, Spain; Department of Analytical Chemistry and Food Technology, Faculty of Pharmacy, University of Castilla-La Mancha, Albacete, Spain
| | - Ángel Ríos
- Department of Analytical Chemistry and Food Technology, Faculty of Science and Chemical Technologies, University of Castilla-La Mancha, Ciudad Real 13071, Spain; Regional Institute for Applied Science Research (IRICA), Ciudad Real 13071, Spain.
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3
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Zhang J, Zhou R, Minamimoto H, Yasuda S, Murakoshi K. Nonzero Wavevector Excitation of Graphene by Localized Surface Plasmons. NANO LETTERS 2019; 19:7887-7894. [PMID: 31557442 DOI: 10.1021/acs.nanolett.9b02947] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Electrochemical surface-enhanced Raman scattering measurements of single layer graphene provide unique information on resonant excitation induced by localized surface plasmons under controlled electron or hole doping. The highly confined electromagnetic field from the LSPs of the Au nanodimer structures prepared on defect-free graphene can generate holes and electrons of the electrochemical potentials beyond the limit of far-field light illumination. The electrochemical in situ SERS spectra prove nonzero wavevector excitation through the observation of normally forbidden Raman bands in graphene. The present findings point to a novel approach to breaking the limit of optoelectronic interactions and photochemical reactions of graphene and other semiconductors.
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Affiliation(s)
- Jinjiang Zhang
- Graduate School of Chemical Sciences and Engineering , Hokkaido University , Sapporo 060-8628 , Japan
| | - Ruifeng Zhou
- Department of Chemistry, Faculty of Science , Hokkaido University , Sapporo 060-0810 , Japan
- Institute for the Advancement of Higher Education , Hokkaido University , Sapporo 060-8617 , Japan
| | - Hiro Minamimoto
- Department of Chemistry, Faculty of Science , Hokkaido University , Sapporo 060-0810 , Japan
| | - Satoshi Yasuda
- Department of Chemistry, Faculty of Science , Hokkaido University , Sapporo 060-0810 , Japan
| | - Kei Murakoshi
- Department of Chemistry, Faculty of Science , Hokkaido University , Sapporo 060-0810 , Japan
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4
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Al-Ani LA, Yehye WA, Kadir FA, Hashim NM, AlSaadi MA, Julkapli NM, Hsiao VKS. Hybrid nanocomposite curcumin-capped gold nanoparticle-reduced graphene oxide: Anti-oxidant potency and selective cancer cytotoxicity. PLoS One 2019; 14:e0216725. [PMID: 31086406 PMCID: PMC6516671 DOI: 10.1371/journal.pone.0216725] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Accepted: 04/28/2019] [Indexed: 12/27/2022] Open
Abstract
Nanotechnology-based antioxidants and therapeutic agents are believed to be the next generation tools to face the ever-increasing cancer mortality rates. Graphene stands as a preferred nano-therapeutic template, due to the advanced properties and cellular interaction mechanisms. Nevertheless, majority of graphene-based composites suffer from hindered development as efficient cancer therapeutics. Recent nano-toxicology reviews and recommendations emphasize on the preliminary synthetic stages as a crucial element in driving successful applications results. In this study, we present an integrated, green, one-pot hybridization of target-suited raw materials into curcumin-capped gold nanoparticle-conjugated reduced graphene oxide (CAG) nanocomposite, as a prominent anti-oxidant and anti-cancer agent. Distinct from previous studies, the beneficial attributes of curcumin are employed to their fullest extent, such that they perform dual roles of being a natural reducing agent and possessing antioxidant anti-cancer functional moiety. The proposed novel green synthesis approach secured an enhanced structure with dispersed homogenous AuNPs (15.62 ± 4.04 nm) anchored on reduced graphene oxide (rGO) sheets, as evidenced by transmission electron microscopy, surpassing other traditional chemical reductants. On the other hand, safe, non-toxic CAG elevates biological activity and supports biocompatibility. Free radical DPPH inhibition assay revealed CAG antioxidant potential with IC50 (324.1 ± 1.8%) value reduced by half compared to that of traditional citrate-rGO-AuNP nanocomposite (612.1 ± 10.1%), which confirms the amplified multi-potent antioxidant activity. Human colon cancer cell lines (HT-29 and SW-948) showed concentration- and time-dependent cytotoxicity for CAG, as determined by optical microscopy images and WST-8 assay, with relatively low IC50 values (~100 μg/ml), while preserving biocompatibility towards normal human colon (CCD-841) and liver cells (WRL-68), with high selectivity indices (≥ 2.0) at all tested time points. Collectively, our results demonstrate effective green synthesis of CAG nanocomposite, free of additional stabilizing agents, and its bioactivity as an antioxidant and selective anti-colon cancer agent.
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Affiliation(s)
- Lina A. Al-Ani
- Institute of Postgraduate Studies, Nanotechnology & Catalysis Research Centre (NANOCAT), University of Malaya, Kuala Lumpur, Malaysia
| | - Wageeh A. Yehye
- Institute of Postgraduate Studies, Nanotechnology & Catalysis Research Centre (NANOCAT), University of Malaya, Kuala Lumpur, Malaysia
| | - Farkaad A. Kadir
- Department of Anatomy and Medical Imaging, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand
| | - Najihah M. Hashim
- Department of Pharmacy, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
- Centre for Natural Products and Drug Discovery (CENAR), University of Malaya, Kuala Lumpur, Malaysia
| | - Mohammed A. AlSaadi
- Institute of Postgraduate Studies, Nanotechnology & Catalysis Research Centre (NANOCAT), University of Malaya, Kuala Lumpur, Malaysia
- University of Malaya Centre for Ionic Liquids (UMCiL), University of Malaya, Kuala Lumpur, Malaysia
- National Chair of Materials Sciences and Metallurgy, University of Nizwa, Nizwa, Sultanate of Oman
| | - Nurhidayatullaili M. Julkapli
- Institute of Postgraduate Studies, Nanotechnology & Catalysis Research Centre (NANOCAT), University of Malaya, Kuala Lumpur, Malaysia
| | - Vincent K. S. Hsiao
- Department of Applied Materials and Optoelectronic Engineering, National Chi Nan University, Nantou, Taiwan
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Verhagen T, Vales V, Kalbac M, Vejpravova J. Electronic and mechanical response of graphene on BaTiO 3 at martensitic phase transitions. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:085001. [PMID: 29345243 DOI: 10.1088/1361-648x/aaa8b7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Graphene is extremely sensitive to optical, electrical and mechanical stimuli, which cause a significant variation of the band structure, thus the physiochemical properties. In our work, we report on changes of strain and doping in graphene grown by chemical vapor deposition on copper and transferred onto a BaTiO3(1 0 0) (BTO) single-crystal. The BTO is known as a ferroelectric material, which undergoes several thermoelastic martensitic phase transitions when it is cooled from 300 K to 10 K. In order to enhance the very weak Raman signal of the graphene monolayer (ML) on the BTO, a 15 nm thin gold layer was deposited on top of the graphene ML to benefit from the surface enhanced Raman scattering. Using temperature dependent Raman spectral mapping, the principal Raman modes (D, G and 2D) of the graphene ML were followed in situ. From a careful analysis of these Raman modes, we conclude that the induced strain and doping of the graphene ML follows the martensitic phase transitions of the BTO crystal. Our study suggests potential exploitation of the graphene as a highly sensitive opto-mechanical sensor or transducer.
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Affiliation(s)
- Tim Verhagen
- Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, CZ-121 16, Prague 2, Czechia. Institute of Physics of the CAS, v.v.i., Na Slovance 1999/2, CZ-182 21 Prague 8, Czechia
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6
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Sutrová V, Šloufová I, Melníková Z, Kalbáč M, Pavlova E, Vlčková B. Effect of Ethanethiolate Spacer on Morphology and Optical Responses of Ag Nanoparticle Array-Single Layer Graphene Hybrid Systems. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:14414-14424. [PMID: 29172530 DOI: 10.1021/acs.langmuir.7b03462] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Single layer graphene (SLG) and two-dimensional (2-D) plasmonic Ag nanoparticle arrays assembled by chemisorption of ethanethiol (ET) molecules (AgNPs-ET) were employed as components of two types of hybrid systems designed for surface-enhanced Raman scattering (SERS) spectral probing of SLG localized in the vicinity of plasmonic NPs. Both hybrids were characterized by optical microscopy, transmission electron microscopy (TEM), surface plasmon extinction (SPE), and SERS microRaman spectral measurements at four excitation wavelengths spanning the 445-780 nm range. SERS spectral probing of the glass/SLG/AgNPs-ET hybrid prepared by overdeposition of SLG on glass by the array of ET-modified Ag NPs has shown that the chemisorbed ET acts as an efficient molecular spacer between SLG and Ag NPs surface which, in turn, enabled to obtain SERS spectra of SLG unperturbed by doping or strain. TEM imaging and SERS spectral probing of the second hybrid prepared by overdeposition of AgNPs-ET array on glass by SLG revealed removal of the adsorbed ET molecules and annealing of Ag NPs during the SLG deposition. The characteristics of the resulting glass/AgNPs/SLG hybrid system, namely (i) broad distribution of the annealed Ag NPs sizes and shapes, (ii) SPE curve covering the overall visible spectral region, (iii) absence of the ET spectral bands in SERS spectra, and (iv) fairly uniform SERS enhancement of the G and 2D mode of SLG in the 532-780 nm range in the straight sample geometry indicate that this hybrid can provide a suitable platform for investigation of the excitation wavelength dependence of combined SERS/GERS (graphene-enhanced Raman scattering) enhancement experienced by various molecular species brought into contact with SLG in this hybrid. Finally, weak optical effects attributed to increased reflectivity of SLG in the near field of Ag NPs arrays have been observed in the excitation wavelength dependence of the SERS spectra of both types of hybrid systems.
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Affiliation(s)
- Veronika Sutrová
- Faculty of Science, Department of Physical and Macromolecular Chemistry, Charles University , Hlavova 8, Prague 2, 128 40, Czech Republic
- Institute of Macromolecular Chemistry AS CR , Heyrovsky Square 2, 162 06 Prague 6, Czech Republic
| | - Ivana Šloufová
- Faculty of Science, Department of Physical and Macromolecular Chemistry, Charles University , Hlavova 8, Prague 2, 128 40, Czech Republic
| | - Zuzana Melníková
- J. Heyrovsky Institute of Physical Chemistry of the ASCR , v.v.i, Dolejškova 3, 182 21 Prague 8, Czech Republic
| | - Martin Kalbáč
- J. Heyrovsky Institute of Physical Chemistry of the ASCR , v.v.i, Dolejškova 3, 182 21 Prague 8, Czech Republic
| | - Ewa Pavlova
- Institute of Macromolecular Chemistry AS CR , Heyrovsky Square 2, 162 06 Prague 6, Czech Republic
| | - Blanka Vlčková
- Faculty of Science, Department of Physical and Macromolecular Chemistry, Charles University , Hlavova 8, Prague 2, 128 40, Czech Republic
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7
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Tang B, Ji G, Wang Z, Chen H, Li X, Yu H, Li S, Liu H. Three-dimensional graphene networks and reduced graphene oxide nanosheets co-modified dye-sensitized solar cells. RSC Adv 2017. [DOI: 10.1039/c7ra09135d] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Graphene assisted dye-sensitized solar cells (DSSCs) have drawn increasing attention because of their high performances.
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Affiliation(s)
- Bo Tang
- School of Petroleum Engineering
- Changzhou University
- Changzhou city 213016
- China
| | - Guojian Ji
- School of Petroleum Engineering
- Changzhou University
- Changzhou city 213016
- China
| | - Zhengwei Wang
- School of Petroleum Engineering
- Changzhou University
- Changzhou city 213016
- China
| | - Haiqun Chen
- School of Petroleum Engineering
- Changzhou University
- Changzhou city 213016
- China
| | - Xufei Li
- School of Petroleum Engineering
- Changzhou University
- Changzhou city 213016
- China
| | - Haogang Yu
- School of Petroleum Engineering
- Changzhou University
- Changzhou city 213016
- China
| | - Sen Li
- School of Petroleum Engineering
- Changzhou University
- Changzhou city 213016
- China
| | - Hong Liu
- School of Petroleum Engineering
- Changzhou University
- Changzhou city 213016
- China
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8
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Qin J, Pan L, Li C, Xia L, Zhou N, Huang Y, Zhang Y. Controlled preparation of Ag nanoparticles on graphene with different amount of defects for surface-enhanced Raman scattering. RSC Adv 2017. [DOI: 10.1039/c7ra03635c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
Graphene with different amounts of defects was prepared by chemical vapor deposition by controlling the flow rate of hydrogen, on which Ag nanoparticles (NPs) were deposited by magnetron sputtering.
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Affiliation(s)
- Jun Qin
- School of Physics and Optoelectronic Technology
- Dalian University of Technology
- Dalian 116024
- PR China
| | - Lujun Pan
- School of Physics and Optoelectronic Technology
- Dalian University of Technology
- Dalian 116024
- PR China
| | - Chengwei Li
- School of Physics and Optoelectronic Technology
- Dalian University of Technology
- Dalian 116024
- PR China
| | - Lichen Xia
- School of Physics and Optoelectronic Technology
- Dalian University of Technology
- Dalian 116024
- PR China
| | - Nan Zhou
- School of Physics and Optoelectronic Technology
- Dalian University of Technology
- Dalian 116024
- PR China
| | - Yingying Huang
- School of Physics and Optoelectronic Technology
- Dalian University of Technology
- Dalian 116024
- PR China
| | - Yi Zhang
- School of Physics and Optoelectronic Technology
- Dalian University of Technology
- Dalian 116024
- PR China
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9
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Surface enhanced Raman scattering of monolayer MX2 with metallic nano particles. Sci Rep 2016; 6:30320. [PMID: 27457808 PMCID: PMC4960528 DOI: 10.1038/srep30320] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Accepted: 07/04/2016] [Indexed: 11/28/2022] Open
Abstract
Monolayer transition metal dichalcogenides MX2 (M = Mo, W; X = S) exhibit remarkable electronic and optical properties, making them candidates for application within flexible nano-optoelectronics. The ability to achieve a high optical signal, while quantitatively monitoring strain in real-time is the key requirement for applications in flexible sensing and photonics devices. Surface-enhanced Raman scattering (SERS) allows us to achieve both simultaneously. However, the SERS depends crucially on the size and shape of the metallic nanoparticles (NPs), which have a large impact on its detection sensitivity. Here, we investigated the SERS of monolayer MX2, with particular attention paid to the effect of the distribution of the metallic NPs. We show that the SERS depends crucially on the distribution of the metallic NPs and also the phonon mode of the MX2. Moreover, strong coupling between MX2 and metallic NPs, through surface plasmon excitation, results in splitting of the and modes and an additional peak becomes apparent. For a WS2-Ag system the intensity of the additional peak increases exponentially with local strain, which opens another interesting window to quantitatively measure the local strain using SERS. Our experimental study may be useful for the application of monolayer MX2 in flexible nano-optoelectronics.
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Kovaříček P, Bastl Z, Valeš V, Kalbac M. Covalent Reactions on Chemical Vapor Deposition Grown Graphene Studied by Surface-Enhanced Raman Spectroscopy. Chemistry 2016; 22:5404-8. [PMID: 26929075 DOI: 10.1002/chem.201504689] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2015] [Revised: 02/04/2016] [Indexed: 12/31/2022]
Abstract
Graphene is a material of unmatched properties and eminent potential in disciplines ranging from physics, to chemistry, to biology. Its advancement to applications with a specific function requires rational design and fine tuning of its properties, and covalent introduction of various substituents answers this requirement. We challenged the obstacle of non-trivial and harsh procedures for covalent functionalization of pristine graphene and developed a protocol for mild nucleophilic introduction of organic groups in the gas phase. The painstaking analysis problem of monolayered materials was addressed by using surface-enhanced Raman spectroscopy, which allowed us to monitor and characterize in detail the surface composition. These deliverables provide a toolbox for reactivity of fluorinated graphene under mild reaction conditions, providing structural freedom of the species to-be-grafted to the single-layer graphene.
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Affiliation(s)
- Petr Kovaříček
- Department of Low-Dimensional Systems, J. Heyrovsky Institute of Physical Chemistry of the ASCR, v.v.i., Dolejškova 2155/3, 182 23, Prague, Czech Republic
| | - Zdeněk Bastl
- Department of Low-Dimensional Systems, J. Heyrovsky Institute of Physical Chemistry of the ASCR, v.v.i., Dolejškova 2155/3, 182 23, Prague, Czech Republic
| | - Václav Valeš
- Department of Low-Dimensional Systems, J. Heyrovsky Institute of Physical Chemistry of the ASCR, v.v.i., Dolejškova 2155/3, 182 23, Prague, Czech Republic
| | - Martin Kalbac
- Department of Low-Dimensional Systems, J. Heyrovsky Institute of Physical Chemistry of the ASCR, v.v.i., Dolejškova 2155/3, 182 23, Prague, Czech Republic.
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11
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Costa SD, Weis JE, Frank O, Fridrichová M, Kalbac M. Monitoring the doping of graphene on SiO2/Si substrates during the thermal annealing process. RSC Adv 2016. [DOI: 10.1039/c6ra10764h] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
It is the temperature of annealing after the transfer of CVD graphene influencing the doping and compression level, and thus the various Raman peak positions reported in the literature.
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Affiliation(s)
- S. D. Costa
- J. Heyrovský Institute of Physical Chemistry
- Academy of Sciences of the Czech Republic
- v.v.i
- CZ-18223 Prague 8
- Czech Republic
| | - J. Ek Weis
- J. Heyrovský Institute of Physical Chemistry
- Academy of Sciences of the Czech Republic
- v.v.i
- CZ-18223 Prague 8
- Czech Republic
| | - O. Frank
- J. Heyrovský Institute of Physical Chemistry
- Academy of Sciences of the Czech Republic
- v.v.i
- CZ-18223 Prague 8
- Czech Republic
| | - M. Fridrichová
- J. Heyrovský Institute of Physical Chemistry
- Academy of Sciences of the Czech Republic
- v.v.i
- CZ-18223 Prague 8
- Czech Republic
| | - M. Kalbac
- J. Heyrovský Institute of Physical Chemistry
- Academy of Sciences of the Czech Republic
- v.v.i
- CZ-18223 Prague 8
- Czech Republic
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12
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Abidi IH, Cagang AA, Tyagi A, Riaz MA, Wu R, Sun Q, Luo Z. Oxidized nitinol substrate for interference enhanced Raman scattering of monolayer graphene. RSC Adv 2016. [DOI: 10.1039/c5ra24842f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
We prepared a controllable and reproducible active NiTi alloy substrate with tunable thickness of titanium oxide capping layer for surface enhanced Raman scattering (SERS) of monolayer graphene using a facile oxidation method.
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Affiliation(s)
- Irfan Haider Abidi
- Department of Chemical and Biomolecular Engineering
- Hong Kong University of Science and Technology
- Kowloon
- Hong Kong
| | - Aldrine Abenoja Cagang
- Department of Chemical and Biomolecular Engineering
- Hong Kong University of Science and Technology
- Kowloon
- Hong Kong
| | - Abhishek Tyagi
- Department of Chemical and Biomolecular Engineering
- Hong Kong University of Science and Technology
- Kowloon
- Hong Kong
| | - Muhammad Adil Riaz
- Department of Chemical and Biomolecular Engineering
- Hong Kong University of Science and Technology
- Kowloon
- Hong Kong
| | - Ruizhe Wu
- Department of Chemical and Biomolecular Engineering
- Hong Kong University of Science and Technology
- Kowloon
- Hong Kong
| | - Qingping Sun
- Department of Mechanical and Aerospace Engineering
- Hong Kong University of Science and Technology
- Kowloon
- Hong Kong
| | - Zhengtang Luo
- Department of Chemical and Biomolecular Engineering
- Hong Kong University of Science and Technology
- Kowloon
- Hong Kong
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