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Rehman H, Golubewa L, Basharin A, Urbanovic A, Lahderanta E, Soboleva E, Matulaitiene I, Jankunec M, Svirko Y, Kuzhir P. Fragmented graphene synthesized on a dielectric substrate for THz applications. NANOTECHNOLOGY 2022; 33:395703. [PMID: 35623324 DOI: 10.1088/1361-6528/ac7403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Accepted: 05/27/2022] [Indexed: 06/15/2023]
Abstract
Fragmented multi-layered graphene films were directly synthesized via chemical vapor deposition (CVD) on dielectric substrates with a pre-deposited copper catalyst. We demonstrate that the thickness of the sacrificial copper film, process temperature, and growth time essentially influence the integrity, quality, and disorder of the synthesized graphene. Atomic force microscopy and Kelvin probe force microscopy measurements revealed the presence of nano-agglomerates and charge puddles. The potential gradients measured over the sample surface confirmed that the deposited graphene film possessed a multilayered structure, which was modelled as an ensemble of randomly oriented conductive prolate ellipsoids. THz time domain spectroscopy measurements gave theacconductivity of the graphene flakes and homogenized graphitic films as being around 1200 S cm-1and 1000 S cm-1, respectively. Our approach offers a scalable fabrication of graphene structures composed of graphene flakes, which have effective conductivity sufficient for a wide variety of THz applications.
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Affiliation(s)
- Hamza Rehman
- Department of Physics and Mathematics, Institute of Photonics, University of Eastern Finland, Yliopistokatu 7, FI-80101 Joensuu, Finland
| | - Lena Golubewa
- Center for Physical Sciences and Technology, Saulėtekio av. 3, LT-10257 Vilnius, Lithuania
| | - Alexey Basharin
- Department of Physics and Mathematics, Institute of Photonics, University of Eastern Finland, Yliopistokatu 7, FI-80101 Joensuu, Finland
| | - Andzej Urbanovic
- Center for Physical Sciences and Technology, Saulėtekio av. 3, LT-10257 Vilnius, Lithuania
| | - Erkki Lahderanta
- Lappeenranta-Lahti University of Technology LUT, Yliopistonkatu 34, 53850, Lappeenranta, Finland
| | - Ekaterina Soboleva
- Lappeenranta-Lahti University of Technology LUT, Yliopistonkatu 34, 53850, Lappeenranta, Finland
| | - Ieva Matulaitiene
- Center for Physical Sciences and Technology, Saulėtekio av. 3, LT-10257 Vilnius, Lithuania
| | - Marija Jankunec
- Institute of Biochemistry, Life Sciences Center, Vilnius University, Saulėtekio al. 7, LT-10257, Vilnius, Lithuania
| | - Yuri Svirko
- Department of Physics and Mathematics, Institute of Photonics, University of Eastern Finland, Yliopistokatu 7, FI-80101 Joensuu, Finland
| | - Polina Kuzhir
- Department of Physics and Mathematics, Institute of Photonics, University of Eastern Finland, Yliopistokatu 7, FI-80101 Joensuu, Finland
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Siavash Moakhar R, Hosseini-Hosseinabad SM, Masudy-Panah S, Seza A, Jalali M, Fallah-Arani H, Dabir F, Gholipour S, Abdi Y, Bagheri-Hariri M, Riahi-Noori N, Lim YF, Hagfeldt A, Saliba M. Photoelectrochemical Water-Splitting Using CuO-Based Electrodes for Hydrogen Production: A Review. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2007285. [PMID: 34117806 DOI: 10.1002/adma.202007285] [Citation(s) in RCA: 58] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2020] [Revised: 12/25/2020] [Indexed: 06/12/2023]
Abstract
The cost-effective, robust, and efficient electrocatalysts for photoelectrochemical (PEC) water-splitting has been extensively studied over the past decade to address a solution for the energy crisis. The interesting physicochemical properties of CuO have introduced this promising photocathodic material among the few photocatalysts with a narrow bandgap. This photocatalyst has a high activity for the PEC hydrogen evolution reaction (HER) under simulated sunlight irradiation. Here, the recent advancements of CuO-based photoelectrodes, including undoped CuO, doped CuO, and CuO composites, in the PEC water-splitting field, are comprehensively studied. Moreover, the synthesis methods, characterization, and fundamental factors of each classification are discussed in detail. Apart from the exclusive characteristics of CuO-based photoelectrodes, the PEC properties of CuO/2D materials, as groups of the growing nanocomposites in photocurrent-generating devices, are discussed in separate sections. Regarding the particular attention paid to the CuO heterostructure photocathodes, the PEC water splitting application is reviewed and the properties of each group such as electronic structures, defects, bandgap, and hierarchical structures are critically assessed.
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Affiliation(s)
- Roozbeh Siavash Moakhar
- Department of Bioengineering, McGill University, Montreal, QC, H3A 0E9, Canada
- Non-Metallic Materials Research Group, Niroo Research Institute (NRI), Tehran, 14686-13113, Iran
| | | | - Saeid Masudy-Panah
- Electrical and Computer Engineering, National University of Singapore, Singapore, 119260, Singapore
- Low Energy Electronic Systems (LEES), Singapore-MIT Alliance for Research and Technology (SMART) Centre, Singapore, 38602, Singapore
| | - Ashkan Seza
- Non-Metallic Materials Research Group, Niroo Research Institute (NRI), Tehran, 14686-13113, Iran
- Department of Materials Science and Engineering, Sharif University of Technology, Azadi Ave, Tehran, 11155-9466, Iran
| | - Mahsa Jalali
- Department of Bioengineering, McGill University, Montreal, QC, H3A 0E9, Canada
| | - Hesam Fallah-Arani
- Non-Metallic Materials Research Group, Niroo Research Institute (NRI), Tehran, 14686-13113, Iran
| | - Fatemeh Dabir
- Non-Metallic Materials Research Group, Niroo Research Institute (NRI), Tehran, 14686-13113, Iran
| | - Somayeh Gholipour
- Nanophysics Research Laboratory, Department of Physics, University of Tehran, Tehran, 14395-547, Iran
| | - Yaser Abdi
- Nanophysics Research Laboratory, Department of Physics, University of Tehran, Tehran, 14395-547, Iran
| | - Mohiedin Bagheri-Hariri
- Institute for Corrosion and Multiphase flow Technology, Department of Chemical and Biomedical Engineering, Ohio University, Athens, OH, 45701, USA
| | - Nastaran Riahi-Noori
- Non-Metallic Materials Research Group, Niroo Research Institute (NRI), Tehran, 14686-13113, Iran
| | - Yee-Fun Lim
- Institute of Materials Research and Engineering, Agency for Science Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis, #08-03, Singapore, 138634, Singapore
| | - Anders Hagfeldt
- Laboratory of Photomolecular Science, Ecole Polytechnique Fédérale de Lausanne, EPFL SB-ISIC-LSPM, Station 6, Lausanne, 1015, Switzerland
| | - Michael Saliba
- Institute for Photovoltaics, University of Stuttgart, Pfaffenwaldring 47, D-70569, Stuttgart, Germany
- Helmholtz Young Investigator Group FRONTRUNNER IEK5-Photovoltaik, Forschungszentrum, D-52425, Jülich, Germany
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Chen H, Fang C, Gao X, Jiang G, Wang X, Sun SP, Duo Wu W, Wu Z. Sintering- and oxidation-resistant ultrasmall Cu(I)/(II) oxides supported on defect-rich mesoporous alumina microspheres boosting catalytic ozonation. J Colloid Interface Sci 2021; 581:964-978. [PMID: 32956914 DOI: 10.1016/j.jcis.2020.09.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 09/01/2020] [Accepted: 09/02/2020] [Indexed: 11/28/2022]
Abstract
Supported copper oxides with well-dispersed metal species, small size, tunable valence and high stability are highly desirable in catalysis. Herein, novel copper oxide (CuOx) catalysts supported on defect-rich mesoporous alumina microspheres are developed using a spray-drying-assisted evaporation induced self-assembly method. The catalysts possess a special structure composed of a mesoporous outer layer, a mesoporous-nanosphere-stacked under layer and a hollow cavity. Because of this special structure and the defective nature of the alumina support, the CuOx catalysts are ultrasmall in size (1 ~ 3 nm), bivalent with a very high Cu+/Cu2+ ratio (0.7), and highly stable against sintering and oxidation at high temperatures (up to 800 °C), while the wet impregnation method results in CuOx catalysts with much larger sizes (~15 nm) and lower the Cu+/Cu2+ ratios (~0.29). The catalyst formation mechanism through the spray drying method is proposed and discussed. The catalysts show remarkable performance in catalytic ozonation of phenol wastewaters. With high-concentration phenol (250 ppm) as the model organic pollutant, the optimized catalyst delivers promising catalytic performance with 100% phenol removal and 53% TOC removal in 60 min, and a high cyclic stability. Superoxide anion free radicals (⋅O2-), singlet oxygen (1O2) and hydroxyl radicals (⋅OH) are the predominant reactive species. A detailed structure-performance study reveals the surface hydroxyl groups and Cu+/Cu2+ redox couples play cooperatively to accelerate O3 decomposition generating reactive radicals. The plausible catalytic O3 decomposition mechanism is proposed and discussed with supportive evidences.
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Affiliation(s)
- Hua Chen
- Engineering Research Centre of Advanced Powder Technology (ERCAPT), School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu Province 215123, PR China
| | - Cunxia Fang
- Engineering Research Centre of Advanced Powder Technology (ERCAPT), School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu Province 215123, PR China
| | - Xingmin Gao
- Engineering Research Centre of Advanced Powder Technology (ERCAPT), School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu Province 215123, PR China
| | - Guanyun Jiang
- Engineering Research Centre of Advanced Powder Technology (ERCAPT), School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu Province 215123, PR China
| | - Xiaoning Wang
- Engineering Research Centre of Advanced Powder Technology (ERCAPT), School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu Province 215123, PR China
| | - Sheng-Peng Sun
- Engineering Research Centre of Advanced Powder Technology (ERCAPT), School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu Province 215123, PR China
| | - Winston Duo Wu
- Engineering Research Centre of Advanced Powder Technology (ERCAPT), School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu Province 215123, PR China.
| | - Zhangxiong Wu
- Engineering Research Centre of Advanced Powder Technology (ERCAPT), School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu Province 215123, PR China.
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Nguyen DCT, Cho KY, Oh WC. Mesoporous CuO-graphene coating of mesoporous TiO2 for enhanced visible-light photocatalytic activity of organic dyes. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2018.10.009] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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5
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Oh WC, Cho KY, Jung CH, Tien Nguyen DC. Photocatalytic activities using a nanocomposite of mesoporous SiO2 and CdInSe-graphene nanoparticles under visible light irradiation. J Photochem Photobiol A Chem 2019. [DOI: 10.1016/j.jphotochem.2018.11.025] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Highly efficient visible light driven photocatalytic activities of the LaCuS2-graphene composite-decorated ordered mesoporous silica. Sep Purif Technol 2018. [DOI: 10.1016/j.seppur.2018.05.019] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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7
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An eco-friendly synthesized mesoporous-silica particle combined with WSe 2-graphene-TiO 2 by self-assembled method for photocatalytic dye decomposition and hydrogen production. Sci Rep 2018; 8:12759. [PMID: 30143720 PMCID: PMC6109040 DOI: 10.1038/s41598-018-31188-w] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Accepted: 08/14/2018] [Indexed: 11/08/2022] Open
Abstract
To address the limitations of titanium dioxide (TiO2) and expand the applicability of the photocatalytic activity of TiO2,WSe2 and silica, an eco-friendly, self-assembled method for combining a silica precursor with a WSe2-graphene-TiO2 composite with cetyltrimethylammonium bromide (CTAB) as surface active agents is proposed. Firstly, for the main target, the photocatalytic degradation of organic dye solutions with different initial pH levels and catalyst dosages under visible light irradiation was surveyed. The as-synthesized sample exhibited highly efficient photocatalytic effects for the treatment of the SO dye solution in the optimal conditions of this study, which included a solution with a pH level of 11 and 0.05-gram dosage of the catalyst. Secondly, previous photocatalytic hydrogen production studies reported markedly better outcomes with SiO2/WSe2-graphene-TiO2 than with the binary WSe2-graphene and ternary WSe2-graphene-TiO2 composites under ambient conditions with and without 20% methanol sacrificing reagents. The SiO2/WSe2-graphene-TiO2 composite is promising to become a potential candidate for photocatalytic performance that performs excellently as well as offer an efficient heterosystem for hydrogen production.
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Nguyen DCT, Oh WC. Ternary self-assembly method of mesoporous silica and Cu 2 O combined graphene composite by nonionic surfactant and photocatalytic degradation of cationic-anionic dye pollutants. Sep Purif Technol 2018. [DOI: 10.1016/j.seppur.2017.08.054] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Nguyen DCT, Cho KY, Oh WC. Synthesis of mesoporous SiO2/Cu2O–graphene nanocomposites and their highly efficient photocatalytic performance for dye pollutants. RSC Adv 2017. [DOI: 10.1039/c7ra03526h] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A mesoporous SiO2/Cu2O–graphene composite, a novel material, was successfully synthesized using a self-assembly method with tetraethyl orthosilicate (TEOS).
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Affiliation(s)
| | - Kwang Yeon Cho
- Korea Institutes of Ceramic Engineering and Technology
- Jinju-Si
- Republic of Korea
| | - Won-Chun Oh
- Department of Advanced Materials Science & Engineering
- Hanseo University
- Seosan
- Korea
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10
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Ren X, Liu J, Ren J, Tang F, Meng X. One-pot synthesis of active copper-containing carbon dots with laccase-like activities. NANOSCALE 2015; 7:19641-19646. [PMID: 26548709 DOI: 10.1039/c5nr04685h] [Citation(s) in RCA: 86] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Herein, an effective strategy for designing a new type of nanozyme, blue fluorescent laccase mimics, is reported. Active copper-containing carbon dots (Cu-CDs) were synthesized through a simple, nontoxic and one-pot hydrothermal method, which showed favorable photoluminescence properties and good photostability under high-salt conditions or in a broad pH range (3.0-13.5). The Cu-CDs possessed intrinsic laccase-like activities and could catalyze the oxidation of the laccase substrate p-phenylenediamine (PPD) to produce a typical color change from colorless to brown. Poly(methacrylic acid sodium salt) (PMAA) not only was used as the carbon source and reducing agent, but also provided carboxyl groups to assist flocculation between Cu-CDs and polyacrylamide, which facilitated the removal of PPD. Importantly, the intrinsic fluorescence of the as-prepared Cu-CDs could indicate the presence of hydroquinone, one of the substrates of laccases, based on laccase mimics and fluorescence quenching.
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Affiliation(s)
- Xiangling Ren
- Laboratory of Controllable Preparation and Application of Nanomaterials, Center for Micro/nanomaterials and Technology & Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
| | - Jing Liu
- Laboratory of Controllable Preparation and Application of Nanomaterials, Center for Micro/nanomaterials and Technology & Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
| | - Jun Ren
- Laboratory of Controllable Preparation and Application of Nanomaterials, Center for Micro/nanomaterials and Technology & Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
| | - Fangqiong Tang
- Laboratory of Controllable Preparation and Application of Nanomaterials, Center for Micro/nanomaterials and Technology & Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
| | - Xianwei Meng
- Laboratory of Controllable Preparation and Application of Nanomaterials, Center for Micro/nanomaterials and Technology & Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
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11
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Giangregorio MM, Jiao W, Bianco GV, Capezzuto P, Brown AS, Bruno G, Losurdo M. Insights into the effects of metal nanostructuring and oxidation on the work function and charge transfer of metal/graphene hybrids. NANOSCALE 2015; 7:12868-77. [PMID: 26158222 DOI: 10.1039/c5nr02610e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Graphene/metal heterojunctions are ubiquitous in graphene-based devices and, therefore, have attracted increasing interest of researchers. Indeed, the literature on the field reports apparently contradictory results about the effect of a metal on graphene doping. Here, we elucidate the effect of metal nanostructuring and oxidation on the metal work function (WF) and, consequently, on the charge transfer and doping of graphene/metal hybrids. We show that nanostructuring and oxidation of metals provide a valid support to frame WF and doping variation in metal/graphene hybrids. Chemical vapour-deposited monolayer graphene has been transferred onto a variety of metal surfaces, including d-metals, such as Ag, Au, and Cu, and sp-metals, such as Al and Ga, configured as thin films or nanoparticle (NP) ensembles of various average sizes. The metal-induced charge transfer and the doping of graphene have been investigated using Kelvin probe force microscopy (KPFM), and corroborated by Raman spectroscopy and plasmonic ellipsometric spectroscopy. We show that when the appropriate WF of the metal is considered, without any assumption, taking into account WF variations by nanostructure and/or oxidation, a linear relationship between the metal WF and the doping of graphene is found. Specifically, for all metals, nanostructuring lowers the metal WF. In addition, using gold as an example, a critical metal nanoparticle size is found at which the direction of charge transfer, and consequently graphene doping, is inverted.
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Affiliation(s)
- M M Giangregorio
- CNR-NANOTEC, Istituto di Nanotecnologia and IMIP-Institute of Inorganic Methodologies and of Plasmas, via Orabona, 4, 70126 Bari, Italy.
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Zhang X, Zhou J, Song H, Chen X, Fedoseeva YV, Okotrub AV, Bulusheva LG. "Butterfly effect" in CuO/graphene composite nanosheets: a small interfacial adjustment triggers big changes in electronic structure and Li-ion storage performance. ACS APPLIED MATERIALS & INTERFACES 2014; 6:17236-17244. [PMID: 25226227 DOI: 10.1021/am505186a] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Generally speaking, excellent electrochemical performance of metal oxide/graphene nanosheets (GNSs) composite is attributed to the interfacial interaction (or "synergistic effect") between constituents. However, there are no any direct observations on how the electronic structure is changed and how the properties of Li-ion storage are affected by adjusting the interfacial interaction, despite of limited investigations on the possible nature of binding between GNSs and metal oxide. In this paper, CuO nanosheets/GNSs composites with a little Cu2O (ca. 4 wt %) were utilized as an interesting model to illustrate directly the changes of interfacial nature as well as its deep influence on the electronic structure and Li-ion storage performance of composite. The interfacial adjustment was successfully fulfilled by removal of Cu2O in the composite by NH3·H2O. Formation of Cu-O-C bonds on interfaces both between CuO and GNSs, and Cu2O and GNSs in the original CuO/GNSs composites was detected. The small interfacial alteration by removal of the little Cu2O results in the obvious changes in electronic structure, such as weakening of covalent Cu-O-C interfacial interaction and recovery of π bonds in graphene, and simultaneously leads to variations in electrochemical performance of composites, including a 21% increase of reversible capacity, degradation of cyclic stability and rate-performance, and obvious increase of charge-transfer resistance, which can be called a "butterfly effect" in graphene-based metal oxide composites. These interesting phenomena could be helpful to design not only the high-performance graphene/metal oxide anode materials but also various advanced graphene-based composites used in the other fields such as sensors, catalysis, fuel cells, solar cells, etc.
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Affiliation(s)
- Xiaoting Zhang
- State Key Laboratory of Chemical Resource Engineering, Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology , Beijing 100029, China
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James TH, Cannon C, Scott D, AlOthman Z, Apblett A, Materer NF. Titania-hydroxypropyl cellulose thin films for the detection of peroxide vapors. ACS APPLIED MATERIALS & INTERFACES 2014; 6:10205-10212. [PMID: 24848322 DOI: 10.1021/am501535g] [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
Titania nanoparticles in a hydroxypropyl cellulose matrix produced using a sol-gel method were utilized to prepare films on polycarbonate slides and coatings on cellulose papers. The exposure of these materials to hydrogen peroxide gas leads to the development of an intense yellow color. By using an inexpensive web camera and a tungsten lamp to measure the reflected light, first-order behavior in the color change was observed when exposed to peroxide vapor of less than 50 ppm. For 50 mass percent titania nanoparticles in hydroxypropyl cellulose films on polycarbonate, the detection limit was estimated to be 90 ppm after a 1 min measurement and 1.5 ppm after a 1 h integration. The coatings on the filter paper had a 3-fold higher sensitivity compared to the films, with a detection limit of 5.4 ppm peroxide for a 1 min measurement and 0.09 ppm peroxide for a 1 h integration. The high sensitivity and rapid response of these films make them a promising material for use as a sensitive peroxide detector.
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Affiliation(s)
- Travis H James
- Department of Chemistry, Oklahoma State University , Stillwater, Oklahoma 74078-3071, United States
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Purushothaman KK, Saravanakumar B, Babu IM, Sethuraman B, Muralidharan G. Nanostructured CuO/reduced graphene oxide composite for hybrid supercapacitors. RSC Adv 2014. [DOI: 10.1039/c4ra02107j] [Citation(s) in RCA: 106] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
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15
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Zhou F, Li Z, Shenoy GJ, Li L, Liu H. Enhanced room-temperature corrosion of copper in the presence of graphene. ACS NANO 2013; 7:6939-47. [PMID: 23883292 DOI: 10.1021/nn402150t] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
This paper reports the enhancement of long-term oxidation of copper at room temperature by a graphene coating. Previous studies showed that graphene is an effective anticorrosion barrier against short-term thermal and electrochemical oxidation of metals. Here, we show that a graphene coating can, on the contrary, accelerate long-term oxidation of an underlying copper substrate in ambient atmosphere at room temperature. After 6 months of exposure in air, both Raman spectroscopy and energy-dispersive X-ray spectroscopy indicated that graphene-coated copper foil had a higher degree of oxidation than uncoated foil, although X-ray photoelectron spectroscopy showed that the surface concentration of Cu(2+) was higher for the uncoated sample. In addition, we observed that the oxidation of graphene-coated copper foil was not homogeneous and occurred within micrometer-sized domains. The corrosion enhancement effect of graphene was attributed to its ability to promote electrochemical corrosion of copper.
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Affiliation(s)
- Feng Zhou
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
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16
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Electrochemical reduction of nitrate on graphene modified copper electrodes in alkaline media. J Electroanal Chem (Lausanne) 2013. [DOI: 10.1016/j.jelechem.2013.04.001] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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17
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Reddy MV, Subba Rao GV, Chowdari BVR. Metal Oxides and Oxysalts as Anode Materials for Li Ion Batteries. Chem Rev 2013; 113:5364-457. [DOI: 10.1021/cr3001884] [Citation(s) in RCA: 2468] [Impact Index Per Article: 224.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- M. V. Reddy
- Department of Physics, Solid State Ionics & Advanced Batteries Lab, National University of Singapore, Singapore- 117 542
| | - G. V. Subba Rao
- Department of Physics, Solid State Ionics & Advanced Batteries Lab, National University of Singapore, Singapore- 117 542
| | - B. V. R. Chowdari
- Department of Physics, Solid State Ionics & Advanced Batteries Lab, National University of Singapore, Singapore- 117 542
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Large-area high-throughput synthesis of monolayer graphene sheet by Hot Filament Thermal Chemical Vapor Deposition. Sci Rep 2012; 2:682. [PMID: 23002423 PMCID: PMC3448070 DOI: 10.1038/srep00682] [Citation(s) in RCA: 128] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2012] [Accepted: 09/03/2012] [Indexed: 01/29/2023] Open
Abstract
We report hot filament thermal CVD (HFTCVD) as a new hybrid of hot filament and thermal CVD and demonstrate its feasibility by producing high quality large area strictly monolayer graphene films on Cu substrates. Gradient in gas composition and flow rate that arises due to smart placement of the substrate inside the Ta filament wound alumina tube accompanied by radical formation on Ta due to precracking coupled with substrate mediated physicochemical processes like diffusion, polymerization etc., led to graphene growth. We further confirmed our mechanistic hypothesis by depositing graphene on Ni and SiO2/Si substrates. HFTCVD can be further extended to dope graphene with various heteroatoms (H, N, and B, etc.,), combine with functional materials (diamond, carbon nanotubes etc.,) and can be extended to all other materials (Si, SiO2, SiC etc.,) and processes (initiator polymerization, TFT processing) possible by HFCVD and thermal CVD.
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Tian J, Li H, Xing Z, Wang L, Luo Y, Asiri AM, Al-Youbi AO, Sun X. One-pot green hydrothermal synthesis of CuO–Cu2O–Cu nanorod-decorated reduced graphene oxide composites and their application in photocurrent generation. Catal Sci Technol 2012. [DOI: 10.1039/c2cy20406a] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Qi Y, Mazur U, Hipps KW. Charge transfer induced chemical reaction of tetracyano-p-quinodimethane adsorbed on graphene. RSC Adv 2012. [DOI: 10.1039/c2ra21756b] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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