1
|
Lee J, Ju S, Lim C, Lee J, Yoon Y. Effect of a solvothermal method using DMF on the dispersibility of rGO, application of rGO as a CDI electrode material, and recovery of sp 2-hybridized carbon. RSC Adv 2024; 14:22665-22675. [PMID: 39027039 PMCID: PMC11255561 DOI: 10.1039/d4ra03387f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2024] [Accepted: 07/04/2024] [Indexed: 07/20/2024] Open
Abstract
Graphene is prized for its large surface area and superior electrical properties. Efforts to maximize the electrical conductivity of graphene commonly result in the recovery of sp2-hybridized carbon in the form of reduced graphene oxide (rGO). However, rGO shows poor dispersibility and aggregation when mixed with other materials without hydrophilic functional groups, This could lead to electrode delamination, agglomeration, and reduced efficiency. This study focuses on the impact of solvothermal reduction on the dispersibility and capacitance of rGO compared with chemical reduction. The results show that the dispersibility of rGO-D obtained through solvothermal reduction using N,N-dimethylformamide improved compared to that obtained through chemical reduction (rGO-H). Furthermore, when utilized as a material for CDI, an improvement in deionization efficiency was observed in the AC@rGO-D-based CDI system compared to AC@rGO-H and AC. However, the specific surface area, a key factor affecting CDI efficiency, was higher in rGO-H (249.572 m2 g-1) than in rGO-D (150.661 m2 g-1). While AC@rGO-H is expected to exhibit higher deionization efficiency due to its greater specific surface area, the opposite was observed. This highlights the effect of the improved dispersibility of rGO-D and underscores its potential as a valuable material for CDI applications.
Collapse
Affiliation(s)
- Junho Lee
- Department of Environmental and Energy Engineering, Yonsei University Wonju 26493 Republic of Korea +82-10-8993-0744
| | - Seonghyeon Ju
- Department of Environmental and Energy Engineering, Yonsei University Wonju 26493 Republic of Korea +82-10-8993-0744
| | - Chaehwi Lim
- Department of Environmental and Energy Engineering, Yonsei University Wonju 26493 Republic of Korea +82-10-8993-0744
| | - Jihoon Lee
- Department of Environmental and Energy Engineering, Yonsei University Wonju 26493 Republic of Korea +82-10-8993-0744
| | - Yeojoon Yoon
- Department of Environmental and Energy Engineering, Yonsei University Wonju 26493 Republic of Korea +82-10-8993-0744
| |
Collapse
|
2
|
Ma J, Yan R, Wo X, Cao Y, Yu X, Li A, Huang J, Li F, Luo L, Zhang Q. Synthesis of Superelastic, Highly Conductive Graphene Aerogel/Liquid Metal Foam and its Piezoresistive Application. Chemistry 2024; 30:e202303594. [PMID: 38278765 DOI: 10.1002/chem.202303594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 01/25/2024] [Accepted: 01/25/2024] [Indexed: 01/28/2024]
Abstract
Graphene aerogel (GA) has important application potential as piezoresistive sensors due to its low density, high conductivity, high porosity, and good mechanical properties. However, the fabrication of GA-based sensors with good mechanical properties and excellent sensing performance is still challenging. Herein, liquid- metal-modified GAs (GA/LM) are proposed for the development of an excellent GA-based sensor. GA/LM with three-dimensional interconnected layered structure exhibits excellent compressive stress of 41 KPa and fast response time (<20 ms). While generally flexible GA composites cannot be compressed beyond 80 % strain without plastic deformation, GA/LM demonstrates a high compressive strength of 60 kPa under a strain of 90 %. A real-time pressure sensor was fabricated based on GA/LM-2 to monitor swallowing, pulse beating, finger, wrist and knee bending, and even plantar pressure during walking. These excellent features enable potential applications in health detection.
Collapse
Affiliation(s)
- Jinlong Ma
- School of Materials Science and Engineering, Shanghai University, 200436, Shanghai, PR China
- Shaoxing Institute of Technology, Shanghai University, 312000, Shaoxing, PR China
| | - Rui Yan
- School of Materials Science and Engineering, Shanghai University, 200436, Shanghai, PR China
| | - Xiaoye Wo
- School of Materials Science and Engineering, Shanghai University, 200436, Shanghai, PR China
| | - Yanpeng Cao
- School of Materials Science and Engineering, Shanghai University, 200436, Shanghai, PR China
- Shaoxing Institute of Technology, Shanghai University, 312000, Shaoxing, PR China
| | - Xiao Yu
- School of Materials Science and Engineering, Shanghai University, 200436, Shanghai, PR China
- Shaoxing Institute of Technology, Shanghai University, 312000, Shaoxing, PR China
| | - Aijun Li
- School of Materials Science and Engineering, Shanghai University, 200436, Shanghai, PR China
- Shaoxing Institute of Technology, Shanghai University, 312000, Shaoxing, PR China
- Zhejiang Institute of Advanced Materials, Shanghai University, 314113, Jiashan, PR China
| | - Jian Huang
- School of Materials Science and Engineering, Shanghai University, 200436, Shanghai, PR China
- Shaoxing Institute of Technology, Shanghai University, 312000, Shaoxing, PR China
- Zhejiang Institute of Advanced Materials, Shanghai University, 314113, Jiashan, PR China
| | - Fenghua Li
- Shaoxing Institute of Technology, Shanghai University, 312000, Shaoxing, PR China
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, 130022, Changchun, Jilin, China
| | - Liqiang Luo
- School of Materials Science and Engineering, Shanghai University, 200436, Shanghai, PR China
- Shaoxing Institute of Technology, Shanghai University, 312000, Shaoxing, PR China
| | - Qixian Zhang
- School of Materials Science and Engineering, Shanghai University, 200436, Shanghai, PR China
- Shaoxing Institute of Technology, Shanghai University, 312000, Shaoxing, PR China
- Zhejiang Institute of Advanced Materials, Shanghai University, 314113, Jiashan, PR China
| |
Collapse
|
3
|
Al-Sakkaf MK, Basfer I, Iddrisu M, Bahadi SA, Nasser MS, Abussaud B, Drmosh QA, Onaizi SA. An Up-to-Date Review on the Remediation of Dyes and Phenolic Compounds from Wastewaters Using Enzymes Immobilized on Emerging and Nanostructured Materials: Promises and Challenges. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2152. [PMID: 37570470 PMCID: PMC10420689 DOI: 10.3390/nano13152152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 07/13/2023] [Accepted: 07/17/2023] [Indexed: 08/13/2023]
Abstract
Addressing the critical issue of water pollution, this review article emphasizes the need to remove hazardous dyes and phenolic compounds from wastewater. These pollutants pose severe risks due to their toxic, mutagenic, and carcinogenic properties. The study explores various techniques for the remediation of organic contaminants from wastewater, including an enzymatic approach. A significant challenge in enzymatic wastewater treatment is the loss of enzyme activity and difficulty in recovery post-treatment. To mitigate these issues, this review examines the strategy of immobilizing enzymes on newly developed nanostructured materials like graphene, carbon nanotubes (CNTs), and metal-organic frameworks (MOFs). These materials offer high surface areas, excellent porosity, and ample anchoring sites for effective enzyme immobilization. The review evaluates recent research on enzyme immobilization on these supports and their applications in biocatalytic nanoparticles. It also analyzes the impact of operational factors (e.g., time, pH, and temperature) on dye and phenolic compound removal from wastewater using these enzymes. Despite promising outcomes, this review acknowledges the challenges for large-scale implementation and offers recommendations for future research to tackle these obstacles. This review concludes by suggesting that enzyme immobilization on these emerging materials could present a sustainable, environmentally friendly solution to the escalating water pollution crisis.
Collapse
Affiliation(s)
- Mohammed K. Al-Sakkaf
- Department of Chemical Engineering, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
| | - Ibrahim Basfer
- Department of Chemical Engineering, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
| | - Mustapha Iddrisu
- Department of Chemical Engineering, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
| | - Salem A. Bahadi
- Department of Chemical Engineering, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
| | - Mustafa S. Nasser
- Gas Processing Center, College of Engineering, Qatar University, Doha 2713, Qatar
| | - Basim Abussaud
- Department of Chemical Engineering, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
| | - Qasem A. Drmosh
- Department of Materials Science and Engineering, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
- Interdisciplinary Research Center for Hydrogen and Energy Storage, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
| | - Sagheer A. Onaizi
- Department of Chemical Engineering, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
- Interdisciplinary Research Center for Hydrogen and Energy Storage, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
| |
Collapse
|
4
|
Ravichandran PK, Munusamy C. Optimization of reduced Graphene oxide synthesis using central composite design analysis-A waste to value approach. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:28259-28273. [PMID: 36396762 DOI: 10.1007/s11356-022-24018-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Accepted: 11/01/2022] [Indexed: 06/16/2023]
Abstract
In recent times, reduced graphene oxide has gained more attention in various fields. In our study, a direct synthesis of reduced graphene oxide using a novel carbon-rich agro-waste from Pennisetum glaucum was used. Ferrocene acted as an oxidizing agent during thermal degradation at 300 °C for 15 and 20 min to promote graphene oxide and reduced graphene oxide formation. The X-ray diffraction peak at 2θ indicating a shift from 16.86 to 24.28°, presence of functional groups like -OH stretching, -C = C-, C = O, C-O, and C-OH by Fourier transmission infrared spectroscopy, prominent D and G bands at 1308 cm-1 and 1578 cm-1 by Raman spectra and UV-visible spectroscopy peak shift from 235 to 245 nm (π-π*, C = C bonds) confirmed the reduction of graphene oxide to reduced graphene oxide. The average particle size values 233.3 nm for graphene oxide and 63.57 nm for reduced graphene oxide illustrate the nanoscale range of our synthesized material. The negative zeta potential values in the range - 45.5 mV and - 29.5 mV for graphene oxide and its reduced forms infer the dispersion stability along with surface oxygen group presence. We have also highlighted the formation of graphene oxide quantum dots by magnetic stirring and confirmed by UV transilluminator and photoluminescence spectra. The photodegradation efficiency was optimized using central composite design for dosage, dye concentration, pH, and time for both malachite green and reactive blue dye. The kinetic studies report pseudo-first-order kinetic model for catalytic degradation and statistical Analysis of variance proved the significance of the process for p value < 0.05. Thus, the synthesized graphene materials could be used as a potential candidate for environmental applications.
Collapse
Affiliation(s)
| | - Chamundeeswari Munusamy
- Department of Biotechnology, St. Joseph's College of Engineering, OMR, Chennai, 600 119, India.
| |
Collapse
|
5
|
Aftab K, Naseem T, Hussain S, Haq S, Waseem M. Synthesis and characterization of Ag 2O, CoFe 2O 4, GO, and their ternary composite for antibacterial activity. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:4079-4093. [PMID: 35962168 DOI: 10.1007/s11356-022-22516-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Accepted: 08/09/2022] [Indexed: 06/15/2023]
Abstract
Currently, nanomaterials with exceptional antibacterial activity have become an emerging domain in research. The optimization of nanomaterials against infection causing agents is the next step in dealing with the present-day problem of antibiotics. In this research work, Ag2O, CoFe2O4, and Ag2O/CoFe2O4/rGO are prepared by chemical methods. Ag2O was prepared by co-precipitation method, while solvothermal technique was utilized for the synthesis of CoFe2O4. The ternary nanocomposite was synthesized by a simple in situ reduction using a two-step approach. The structural and morphological properties were studied by UV-Vis spectroscopy, X-ray diffraction spectroscopy (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (SEM), dynamic light scattering (DLS), and Fourier-transform infrared spectroscopy (FTIR). From the X-ray diffraction analysis, the crystallite size is found to be 14 nm, 5 nm, and 6 nm for Ag2O, CoFe2O4, and Ag2O/CoFe2O4/rGO respectively. The synthesized nanomaterials were investigated for antibacterial activities against gram-positive strain Staphylococcus aureus (S. aureus) and gram-negative strain Escherichia coli (E. coli) using Agar well diffusion method. Ag2O and CoFe2O4 showed zones of inhibition (ZOI) of 13 mm and 11 mm against gram positive bacteria while 12 mm against gram negative bacteria respectively, while ternary nanocomposite showed 14 mm and 13 mm of ZOI. The antibacterial activity of nanomaterials showed a gradual increment with an increase in the concentration of the materials. Ag2O, CoFe2O4, and Ag2O/CoFe2O4/rGO showed minimum inhibitory concentration (MIC) values of 4.5, 6.5, and 4.5 μg/mL for S. aureus and 6.5, 7.2, and 4.8 μg/mL for E. coli respectively. Minimum bactericidal concentrations were found to be same as the MIC values. Additionally, a time-kill curve analysis was performed and for ternary nanocomposite; the killing response was most effective as the complete killing was achieved at 3 h of incubation at 3-MIC (9.75 μg/mL). These results demonstrate that all the nanomaterials, as a kind of antibacterial material, have a great potential for a wide range of biomedical applications.
Collapse
Affiliation(s)
- Komal Aftab
- Department of Chemistry, COMSATS University Islamabad, Islamabad Campus, Islamabad, Pakistan
| | - Taiba Naseem
- Department of Chemistry, University of Azad Jammu and Kashmir, Muzaffarabad, Pakistan
| | - Shahzad Hussain
- Department of Physics, COMSATS University Islamabad, Islamabad Campus, Islamabad, Pakistan
| | - Sirajul Haq
- Department of Chemistry, University of Azad Jammu and Kashmir, Muzaffarabad, Pakistan
| | - Muhammad Waseem
- Department of Chemistry, COMSATS University Islamabad, Islamabad Campus, Islamabad, Pakistan.
| |
Collapse
|
6
|
Fabrication of Inorganic Coatings Incorporated with Functionalized Graphene Oxide Nanosheets for Improving Fire Retardancy of Wooden Substrates. Polymers (Basel) 2022; 14:polym14245542. [PMID: 36559909 PMCID: PMC9784433 DOI: 10.3390/polym14245542] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 11/18/2022] [Accepted: 12/03/2022] [Indexed: 12/23/2022] Open
Abstract
Flame-retardant chemicals are frequently used within consumer products and can even be employed as a treatment on the surface of different types of materials (e.g., wood, steel, and textiles) to prevent fire or limit the rapid spread of flames. Functionalized graphene oxide (FGO) nanosheets are a promising construction coating nanomaterial that can be blended with sodium metasilicate and gypsum to reduce the flammability of construction buildings. In this work, we designed and fabricated novel and halogen-free FGO sheets using the modified Hummers method; and subsequently functionalized them by pentaerythritol through a chemical impregnation process before dispersing them within the construction coating. Scanning electron microscopic images confirm that the FGO-filled coating was uniformly dispersed on the surface of wooden substrates. We identified that the FGO content is a critical factor affecting the fire retardancy. Thermogravimetric analysis of the FGO coating revealed that higher char residue can be obtained at 700 °C. Based on the differential scanning calorimetry, the exothermic peak contained a temperature delay in the presence of FGO sheets, primarily due to the formation of a thermal barrier. Such a significant improvement in the flame retardancy confirms that the FGO nanosheets are superior nanomaterials to be employed as a flame-retardant construction coating nanomaterial for improving thermal management within buildings.
Collapse
|
7
|
Buledi JA, Solangi AR, Mallah A, Shah ZUH, Sherazi ST, Shah MR, Hyder A, Ali S. Electrochemical monitoring of isoproturon herbicide using NiO/V2O5/rGO/GCE. JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION 2022. [DOI: 10.1007/s11694-022-01733-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
8
|
Frontiñan-Rubio J, Llanos-González E, González VJ, Vázquez E, Durán-Prado M. Subchronic Graphene Exposure Reshapes Skin Cell Metabolism. J Proteome Res 2022; 21:1675-1685. [PMID: 35611947 PMCID: PMC9251767 DOI: 10.1021/acs.jproteome.2c00064] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
![]()
In recent years,
the toxicity of graphene-related materials (GRMs)
has been evaluated in diverse models to guarantee their safety. In
most applications, sublethal doses of GRMs contact human barriers
such as skin in a subchronic way. Herein, the subchronic effect (30
day exposure) of three GRMs (GO 1, GO 2, and FLG) with different oxidation
degrees and sizes was studied. The effects of these materials on human
skin cells, HaCaTs, were assayed through high-throughput metabolic-based
readout and other cell-based assays. A differential effect was found
between the different GRMs. GO 2 induced a metabolic remodeling in
epithelial cells, increasing the level of tricarboxylic acid components,
mirrored by increased cell proliferation and changes in cell phenotype.
The oxidation degree, size, and method of manufacture of GRMs dictated
harmful effects on cell metabolism and behavior generated by nontoxic
exposures. Therefore, a “safe by design” procedure is
necessary when working with these nanomaterials.
Collapse
Affiliation(s)
| | | | - Viviana Jehová González
- Instituto Regional de Investigación Científica Aplicada (IRICA), Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain.,Faculty of Chemical Science and Technology, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain
| | - Ester Vázquez
- Instituto Regional de Investigación Científica Aplicada (IRICA), Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain.,Faculty of Chemical Science and Technology, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain
| | - Mario Durán-Prado
- Faculty of Medicine, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain
| |
Collapse
|
9
|
Rapid and efficient testing of the toxicity of graphene-related materials in primary human lung cells. Sci Rep 2022; 12:7664. [PMID: 35538131 PMCID: PMC9088729 DOI: 10.1038/s41598-022-11840-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2021] [Accepted: 04/28/2022] [Indexed: 11/25/2022] Open
Abstract
Graphene and its derivative materials are manufactured by numerous companies and research laboratories, during which processes they can come into contact with their handlers' physiological barriers—for instance, their respiratory system. Despite their potential toxicity, these materials have even been used in face masks to prevent COVID-19 transmission. The increasingly widespread use of these materials requires the design and implementation of appropriate, versatile, and accurate toxicological screening methods to guarantee their safety. Murine models are adequate, though limited when exploring different doses and lengths of exposure—as this increases the number of animals required, contrary to the Three R's principle in animal experimentation. This article proposes an in vitro model using primary, non-transformed normal human bronchial epithelial (NHBE) cells as an alternative to the most widely used model to date, the human lung tumor cell line A549. The model has been tested with three graphene derivatives—graphene oxide (GO), few-layer graphene (FLG), and small FLG (sFLG). We observed a cytotoxic effect (necrosis and apoptosis) at early (6- and 24-h) exposures, which intensified after seven days of contact between cells and the graphene-related materials (GRMs)—with cell death reaching 90% after a 5 µg/mL dose. A549 cells are more resistant to necrosis and apoptosis, yielding values less than half of NHBE cells at low concentrations of GRMs (between 0.05 and 5 µg/mL). Indeed, GRM-induced cell death in NHBE cells is comparable to that induced by toxic compounds such as diesel exhaust particles on the same cell line. We propose NHBE as a suitable model to test GRM-induced toxicity, allowing refinement of the dose concentrations and exposure timings for better-designed in vivo mouse assays.
Collapse
|
10
|
Critical roles of reduced graphene oxide in the electrochemical performance of silicon/reduced graphene oxide hybrids for high rate capable lithium-ion battery anodes. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2021.139753] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
11
|
Flexible Low-Temperature Ammonia Gas Sensor Based on Reduced Graphene Oxide and Molybdenum Disulfide. CHEMOSENSORS 2021. [DOI: 10.3390/chemosensors9120345] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Owing to harsh working environments and complex industrial requirements, traditional gas sensors are prone to deformation damage, possess a limited detection range, require a high working temperature, and display low reliability, thereby necessitating the development of flexible and low-temperature gas sensors. In this study, we developed a low-temperature polyimide (PI)-based flexible gas sensor comprising a reduced graphene oxide (rGO)/MoS2 composite. The micro-electro-mechanical system technology was used to fabricate Au electrodes on a flexible PI sheet to form a “sandwiched” sensor structure. The rGO/MoS2 composites were synthesized via a one-step hydrothermal method. The gas-sensing response was the highest for the composite comprising 10% rGO. The structure of this material was characterized, and a PI-based flexible gas sensor comprising rGO/MoS2 was fabricated. The optimal working temperature of the sensor was 141 °C, and its response-recovery time was significantly short upon exposure to 50–1500 ppm NH3. Thus, this sensor exhibited high selectivity and a wide NH3 detection range. Furthermore, it possessed the advantages of low power consumption, a short response-recovery time, a low working temperature, flexibility, and variability. Our findings provide a new framework for the development of pollutant sensors that can be utilized in an industrial environment.
Collapse
|
12
|
Kwon S, Choi HJ, Shim HC, Yoon Y, Ahn J, Lim H, Kim G, Choi KB, Lee J. Hierarchically Porous, Laser-Pyrolyzed Carbon Electrode from Black Photoresist for On-Chip Microsupercapacitors. NANOMATERIALS 2021; 11:nano11112828. [PMID: 34835593 PMCID: PMC8620280 DOI: 10.3390/nano11112828] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 10/14/2021] [Accepted: 10/20/2021] [Indexed: 01/23/2023]
Abstract
We report a laser-pyrolyzed carbon (LPC) electrode prepared from a black photoresist for an on-chip microsupercapacitor (MSC). An interdigitated LPC electrode was fabricated by direct laser writing using a high-power carbon dioxide (CO2) laser to simultaneously carbonize and pattern a spin-coated black SU-8 film. Due to the high absorption of carbon blacks in black SU-8, the laser-irradiated SU-8 surface was directly exfoliated and carbonized by a fast photo-thermal reaction. Facile laser pyrolysis of black SU-8 provides a hierarchically macroporous, graphitic carbon structure with fewer defects (ID/IG = 0.19). The experimental conditions of CO2 direct laser writing were optimized to fabricate high-quality LPCs for MSC electrodes with low sheet resistance and good porosity. A typical MSC based on an LPC electrode showed a large areal capacitance of 1.26 mF cm-2 at a scan rate of 5 mV/s, outperforming most MSCs based on thermally pyrolyzed carbon. In addition, the results revealed that the high-resolution electrode pattern in the same footprint as that of the LPC-MSCs significantly affected the rate performance of the MSCs. Consequently, the proposed laser pyrolysis technique using black SU-8 provided simple and facile fabrication of porous, graphitic carbon electrodes for high-performance on-chip MSCs without high-temperature thermal pyrolysis.
Collapse
Affiliation(s)
- Soongeun Kwon
- Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery and Materials, 156, Gajeongbuk-Ro, Yuseong-Gu, Daejeon 34103, Korea; (H.-J.C.); (H.C.S.); (J.A.); (H.L.); (G.K.); (K.-B.C.); (J.L.)
- Correspondence:
| | - Hak-Jong Choi
- Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery and Materials, 156, Gajeongbuk-Ro, Yuseong-Gu, Daejeon 34103, Korea; (H.-J.C.); (H.C.S.); (J.A.); (H.L.); (G.K.); (K.-B.C.); (J.L.)
| | - Hyung Cheoul Shim
- Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery and Materials, 156, Gajeongbuk-Ro, Yuseong-Gu, Daejeon 34103, Korea; (H.-J.C.); (H.C.S.); (J.A.); (H.L.); (G.K.); (K.-B.C.); (J.L.)
- Department of Nanomechatronics, Korea University of Science and Technology (UST), 217, Gajeongbuk-Ro, Yuseong-Gu, Daejeon 34113, Korea
| | - Yeoheung Yoon
- Korea Electric Power Research Institute, 105, Munji-Ro, Yuseong-Gu, Daejeon 34056, Korea;
| | - Junhyoung Ahn
- Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery and Materials, 156, Gajeongbuk-Ro, Yuseong-Gu, Daejeon 34103, Korea; (H.-J.C.); (H.C.S.); (J.A.); (H.L.); (G.K.); (K.-B.C.); (J.L.)
| | - Hyungjun Lim
- Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery and Materials, 156, Gajeongbuk-Ro, Yuseong-Gu, Daejeon 34103, Korea; (H.-J.C.); (H.C.S.); (J.A.); (H.L.); (G.K.); (K.-B.C.); (J.L.)
- Department of Nanomechatronics, Korea University of Science and Technology (UST), 217, Gajeongbuk-Ro, Yuseong-Gu, Daejeon 34113, Korea
| | - Geehong Kim
- Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery and Materials, 156, Gajeongbuk-Ro, Yuseong-Gu, Daejeon 34103, Korea; (H.-J.C.); (H.C.S.); (J.A.); (H.L.); (G.K.); (K.-B.C.); (J.L.)
| | - Kee-Bong Choi
- Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery and Materials, 156, Gajeongbuk-Ro, Yuseong-Gu, Daejeon 34103, Korea; (H.-J.C.); (H.C.S.); (J.A.); (H.L.); (G.K.); (K.-B.C.); (J.L.)
| | - JaeJong Lee
- Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery and Materials, 156, Gajeongbuk-Ro, Yuseong-Gu, Daejeon 34103, Korea; (H.-J.C.); (H.C.S.); (J.A.); (H.L.); (G.K.); (K.-B.C.); (J.L.)
- Department of Nanomechatronics, Korea University of Science and Technology (UST), 217, Gajeongbuk-Ro, Yuseong-Gu, Daejeon 34113, Korea
| |
Collapse
|
13
|
Xu Q, Lin X, Gan L, Owens G, Chen Z. Green reduction of graphene oxide using Bacillus sphaericus. J Colloid Interface Sci 2021; 605:881-887. [PMID: 34371431 DOI: 10.1016/j.jcis.2021.07.102] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 07/17/2021] [Accepted: 07/19/2021] [Indexed: 11/30/2022]
Abstract
While chemical methods are often used to convert graphene oxide (GO) to reduced graphene oxide (RGO), chemical reduction is often environmentally unfriendly due to the high toxicity of many chemical reducing agents. To address this limitation, Bacillus sphaericus was used here for the green reduction of GO to RGO. Successful reduction was confirmed by various advanced characterization techniques including Ultraviolet-Visible (UV-vis), X-ray Powder Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Raman spectroscopy, X-ray Photoelectron Spectroscopy (XPS) and Scanning Electron Microscope and Energy Dispersive Spectrometer (SEM-EDS). With a new peak attributable to RGO at 261 nm appearing in UV-vis and XRD spectra of the reduced product also developed a new peak at 2θ = 24.6° characteristic of RGO. Successful reduction was also supported by Raman spectroscopy which showed that the ratio of the intensity band (D band: G band) increased from 0.99 to 1.17. FTIR and XPS both confirmed that specific OH (3399 cm-1), CO (1734 cm-1) and COC (287 eV) bonds were reduced. Cyclic voltammograms (CVs) showed that the produced RGO exhibited good conductivity (changed from 0.8 to 1.1 mW·cm-2). This work developed a green and easy operated method of synthesizing RGO using microorganisms.
Collapse
Affiliation(s)
- Qianyu Xu
- Fujian Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Fujian Normal University, Fuzhou 350007, Fujian Province, China
| | - Xiaoyu Lin
- Fujian Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Fujian Normal University, Fuzhou 350007, Fujian Province, China
| | - Li Gan
- Fujian Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Fujian Normal University, Fuzhou 350007, Fujian Province, China.
| | - Gary Owens
- Environmental Contaminants Group, Future Industries Institute, University of South Australia, Mawson Lakes, SA 5095, Australia
| | - Zuliang Chen
- Fujian Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Fujian Normal University, Fuzhou 350007, Fujian Province, China.
| |
Collapse
|
14
|
Graphene-bentonite supported free-standing, flexible membrane with switchable wettability for selective oil–water separation. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.118569] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
|
15
|
Ball-type phthalocyanines and reduced graphene oxide nanoparticles as separate and combined corrosion inhibitors of aluminium in HCl. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130279] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
16
|
MOOSA AA, ABED MS. Graphene preparation and graphite exfoliation. Turk J Chem 2021; 45:493-519. [PMID: 34385847 PMCID: PMC8326494 DOI: 10.3906/kim-2101-19] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Accepted: 03/19/2021] [Indexed: 01/10/2023] Open
Abstract
The synthesis of Graphene is critical to achieving its functions in practical applications. Different methods have been used to synthesis graphene, but graphite exfoliation is considered the simplest way to produce graphene and graphene oxide. In general, controlling the synthesis conditions to achieving the optimum yield, keeping the pristine structure to realize on-demand properties, minimum layers with the smallest lateral size, and minimum oxygen content are the most obstacles experienced by researchers. Each application requires a specific graphene model, graphene oxides GO, or even graphene intercalated compounds (GIC) depending on synthesis conditions and approach. This paper reviewed and summarized the most researches in this field and focusing on exfoliation methods.
Collapse
Affiliation(s)
- Ahmed A. MOOSA
- Materials Engineering Technology Department, Engineering Technical College, Middle Technical University, BaghdadIraq
| | - Mayyadah S. ABED
- Department of Materials Engineering, University of Technology, BaghdadIraq
| |
Collapse
|
17
|
Timochenco L, Costa-Almeida R, Bogas D, Silva FALS, Silva J, Pereira A, Magalhães FD, Pinto AM. High-Yield Production of Nano-Lateral Size Graphene Oxide by High-Power Ultrasonication. MATERIALS (BASEL, SWITZERLAND) 2021; 14:1916. [PMID: 33921291 PMCID: PMC8069895 DOI: 10.3390/ma14081916] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/13/2021] [Revised: 04/05/2021] [Accepted: 04/09/2021] [Indexed: 02/04/2023]
Abstract
Nanographene oxide (GOn) constitutes a nanomaterial of high value in the biomedical field. However, large scale production of highly stable aqueous dispersions of GOn is yet to be achieved. In this work, we explored high-power ultrasonication as a method to reduce particle size of GO and characterized the impact of the process on the physicochemical properties of the material. GOn was obtained with lateral dimensions of 99 ± 43 nm and surface charge of -39.9 ± 2.2 mV. High-power ultrasonication enabled an improvement of stability features, particularly by resulting in a decrease of the average particle size, as well as zeta potential, in comparison to GO obtained by low-power exfoliation and centrifugation (287 ± 139 nm; -29.7 ± 1.2 mV). Remarkably, GOn aqueous dispersions were stable for up to 6 months of shelf-time, with a global process yield of 74%. This novel method enabled the production of large volumes of highly concentrated (7.5 mg mL-1) GOn aqueous dispersions. Chemical characterization of GOn allowed the identification of characteristic oxygen functional groups, supporting high-power ultrasonication as a fast, efficient, and productive process for reducing GO lateral size, while maintaining the material's chemical features.
Collapse
Affiliation(s)
- Licínia Timochenco
- LEPABE, Faculdade de Engenharia, Universidade do Porto, 4200-180 Porto, Portugal; (L.T.); (D.B.); (F.D.M.)
| | - Raquel Costa-Almeida
- i3S—Instituto de Investigação e Inovação em Saúde, Universidade do Porto, 4200-180 Porto, Portugal; (R.C.-A.); (F.A.L.S.S.)
- INEB—Instituto de Engenharia Biomédica, Universidade do Porto, Rua Alfredo Allen, 208, 4200-180 Porto, Portugal
| | - Diana Bogas
- LEPABE, Faculdade de Engenharia, Universidade do Porto, 4200-180 Porto, Portugal; (L.T.); (D.B.); (F.D.M.)
| | - Filipa A. L. S. Silva
- i3S—Instituto de Investigação e Inovação em Saúde, Universidade do Porto, 4200-180 Porto, Portugal; (R.C.-A.); (F.A.L.S.S.)
- INEB—Instituto de Engenharia Biomédica, Universidade do Porto, Rua Alfredo Allen, 208, 4200-180 Porto, Portugal
| | - Joana Silva
- IFIMUP and IN-Institute of Nanoscience and Nanotechnology, Departamento de Física e Astronomia da Faculdade de Ciências da Universidade do Porto, 4169-007 Porto, Portugal; (J.S.); (A.P.)
- CFP, Department of Physics Engineering, FEUP, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - André Pereira
- IFIMUP and IN-Institute of Nanoscience and Nanotechnology, Departamento de Física e Astronomia da Faculdade de Ciências da Universidade do Porto, 4169-007 Porto, Portugal; (J.S.); (A.P.)
- CFP, Department of Physics Engineering, FEUP, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - Fernão D. Magalhães
- LEPABE, Faculdade de Engenharia, Universidade do Porto, 4200-180 Porto, Portugal; (L.T.); (D.B.); (F.D.M.)
| | - Artur M. Pinto
- LEPABE, Faculdade de Engenharia, Universidade do Porto, 4200-180 Porto, Portugal; (L.T.); (D.B.); (F.D.M.)
- i3S—Instituto de Investigação e Inovação em Saúde, Universidade do Porto, 4200-180 Porto, Portugal; (R.C.-A.); (F.A.L.S.S.)
- INEB—Instituto de Engenharia Biomédica, Universidade do Porto, Rua Alfredo Allen, 208, 4200-180 Porto, Portugal
| |
Collapse
|
18
|
Chen X, Zhu YB, Yu H, Liu JZ, Easton CD, Wang Z, Hu Y, Xie Z, Wu HA, Zhang X, Li D, Wang H. Ultrafast water evaporation through graphene membranes with subnanometer pores for desalination. J Memb Sci 2021. [DOI: 10.1016/j.memsci.2020.118934] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
19
|
Chen X, Zhang S, Zhang L, Zhu P, Zhang G. Design and Characterization of the Surface Porous UHMWPE Composite Reinforced by Graphene Oxide. Polymers (Basel) 2021; 13:482. [PMID: 33546460 PMCID: PMC7913735 DOI: 10.3390/polym13040482] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 01/27/2021] [Accepted: 01/28/2021] [Indexed: 12/02/2022] Open
Abstract
The surface porous ultrahigh molecular weight polyethylene (UHMWPE) composites were successfully fabricated with NaCl and graphene oxide (GO) in the hot-pressing procedure. The GO sheets were evenly dispersed in UHMWPE with the sedimentation method of GO in saturated NaCl. The morphologies, chemical compositions, mechanical, and tribological properties of GO and surface porous GO/NaCl/UHMWPE were investigated. The results show that GO sheet and NaCl could be evenly dispersed in UHMWPE. The regular pores are present on the surface of UHMWPE after NaCl dissolution in distilled water. The wear resistance properties are improved significantly, and the friction properties increased slightly with the addition of GO and NaCl.
Collapse
Affiliation(s)
- Xiaohong Chen
- Institute of Advanced Materials, North China Electric Power University, Beijing 102206, China
| | - Sheng Zhang
- Ningbo Research Institute, Zhejiang University, Ningbo 315100, China;
| | - Lin Zhang
- College of Textile and Clothing, Institute of Functional Textiles and Advanced Materials, State Key Laboratory of Bio-Fibers and Eco-Textiles, Collaborative Innovation Center of Marine Biomass Fibers Materials and Textiles of Shandong Province, Qingdao University, Qingdao 266071, China; (L.Z.); (P.Z.)
- Wilson College of Textiles, North Carolina State University, Raleigh, NC 27606, USA
| | - Ping Zhu
- College of Textile and Clothing, Institute of Functional Textiles and Advanced Materials, State Key Laboratory of Bio-Fibers and Eco-Textiles, Collaborative Innovation Center of Marine Biomass Fibers Materials and Textiles of Shandong Province, Qingdao University, Qingdao 266071, China; (L.Z.); (P.Z.)
| | - Gangqiang Zhang
- College of Textile and Clothing, Institute of Functional Textiles and Advanced Materials, State Key Laboratory of Bio-Fibers and Eco-Textiles, Collaborative Innovation Center of Marine Biomass Fibers Materials and Textiles of Shandong Province, Qingdao University, Qingdao 266071, China; (L.Z.); (P.Z.)
| |
Collapse
|
20
|
Kaleli H, Demirtaş S, Uysal V, Karnis I, Stylianakis MM, Anastasiadis SH, Kim DE. Tribological Performance Investigation of a Commercial Engine Oil Incorporating Reduced Graphene Oxide as Additive. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:386. [PMID: 33546353 PMCID: PMC7913578 DOI: 10.3390/nano11020386] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Revised: 01/28/2021] [Accepted: 01/29/2021] [Indexed: 01/01/2023]
Abstract
We investigated the tribological behavior of commercialized, fully synthetic engine oil upon the incorporation of reduced graphene oxide in seven different concentrations between 0.01 and 0.2 wt %. Stability of the prepared samples was assessed by turbidimetry and dynamic light scattering measurements, and their tribological properties through a reciprocating tribometer, using a steel ball on special cut steel blocks. The addition of 0.02 wt % of reduced graphene oxide led to an improvement of the tribological behavior compared to the pristine engine oil, by significantly lowering the friction coefficient by 5% in the boundary lubrication regime. Both the surfaces and the reduced graphene oxide additive were thoroughly characterized by microscopic and optical spectroscopy techniques. We also verified that a protective layer was formed between the worn surfaces, due to the presence of reduced graphene oxide. Carbon accumulation and various additive elements such as Ca, Zn, S and P were detected on the rubbing surfaces of both the ball and the block through energy-dispersive X-ray spectroscopy. Finally, it was shown that the wear scar diameter on the surface of the steel ball was lower by 3%, upon testing the engine oil sample containing reduced graphene oxide at concentration 0.02 wt %, compared to the control sample.
Collapse
Affiliation(s)
- Hakan Kaleli
- Faculty of Mechanical Engineering, Automotive Division, Yildiz Technical University, Besiktas, Yildiz, 34349 Istanbul, Turkey; (S.D.); (V.U.)
| | - Selman Demirtaş
- Faculty of Mechanical Engineering, Automotive Division, Yildiz Technical University, Besiktas, Yildiz, 34349 Istanbul, Turkey; (S.D.); (V.U.)
| | - Veli Uysal
- Faculty of Mechanical Engineering, Automotive Division, Yildiz Technical University, Besiktas, Yildiz, 34349 Istanbul, Turkey; (S.D.); (V.U.)
| | - Ioannis Karnis
- Institute of Electronic Structure and Laser, Foundation for Research and Technology Hellas (FORTH), GR-70013 Heraklion, Crete, Greece; (I.K.); (S.H.A.)
| | - Minas M. Stylianakis
- Institute of Electronic Structure and Laser, Foundation for Research and Technology Hellas (FORTH), GR-70013 Heraklion, Crete, Greece; (I.K.); (S.H.A.)
| | - Spiros H. Anastasiadis
- Institute of Electronic Structure and Laser, Foundation for Research and Technology Hellas (FORTH), GR-70013 Heraklion, Crete, Greece; (I.K.); (S.H.A.)
| | - Dae-Eun Kim
- Center for Nano-Wear, Department of Mechanical Engineering, Yonsei University, Seoul 03722, Korea;
| |
Collapse
|
21
|
Bo Strunck A, Suri A, Boffa V. Effect of Temperature and Branched Crosslinkers on Supported Graphene Oxide Pervaporation Membranes for Ethanol Dehydration. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E1571. [PMID: 32785060 PMCID: PMC7466621 DOI: 10.3390/nano10081571] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 07/29/2020] [Accepted: 08/06/2020] [Indexed: 12/03/2022]
Abstract
We describe the performance of graphene oxide (GO) membranes stabilized by crosslinkers and supported on polyethersulfone films in the dehydration of ethanol in a continuous cross-flow pervaporation set-up. We used two crosslinker species with branched structures (humic acid-like substances derived from urban waste and a synthetic hyperbranched polyol). The supported crosslinked GO films were prepared by rod coating on a polyethersulfone ultrafiltration membrane. Pervaporation experiments were carried out at temperatures of 40, 50, 60 and 70 °C. When the feed comprised pure water and ethanol, a much higher flux of water than ethanol was observed at all temperatures through GO films stabilized by the two crosslinkers (humic acid, GO-HAL, and the synthetic hyperbranched polyol, GO-HBPO), indicating the separation ability of these crosslinked membranes. For feed mixtures of water and ethanol, the GO-HAL and GO-HBPO membranes showed good separation performances by producing permeates with a significantly higher water content than the feed at all temperatures.
Collapse
Affiliation(s)
| | - Anil Suri
- Center for Membrane Technology, Department of Chemistry and Bioscience, Aalborg University, Fredrik Bajers Vej 7H, 9220 Aalborg Øst, Denmark; (A.B.S.); (V.B.)
| | | |
Collapse
|
22
|
Microstructural and Tribological Properties of a Dopamine Hydrochloride and Graphene Oxide Coating Applied to Multifilament Surgical Sutures. Polymers (Basel) 2020; 12:polym12081630. [PMID: 32708037 PMCID: PMC7465952 DOI: 10.3390/polym12081630] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 07/17/2020] [Accepted: 07/21/2020] [Indexed: 11/16/2022] Open
Abstract
With the development of fine surgery and desire for low-injury methods, the frictional properties of surgical sutures are one of the crucial factors that can cause damage to tissue, especially for some fragile and sensitive human tissues such as the eyeball. In this study, dopamine hydrochloride and graphene oxide were used as external application agents to prepare a biological coating for the surface of multifilament surgical sutures. The effects of this biocoating on the surface morphology, chemical properties, mechanical properties, and tribological properties of surgical sutures were studied. The friction force and the coefficient of friction of surgical sutures penetrating through a skin substitute were evaluated using a penetration friction apparatus and a linear elastic model. The tribological mechanism of the coating on the multifilament surgical sutures was investigated according to the results of the tribological test. The results showed that there were uniform dopamine and graphene oxide films on the surface of the surgical sutures, and that the fracture strength and yield stress of the coated sutures both increased. The surface wettability of the surgical sutures was improved after the coating treatment. The friction force and the coefficient of friction of the multifilament surgical sutures with the dopamine hydrochloride and graphene oxide coating changed little compared to those of the untreated multifilament surgical sutures.
Collapse
|
23
|
A mechanistic approach for the modulation of band gap of nanopolyaniline using various heterogeneous carbon nanostructures. Polym Bull (Berl) 2020. [DOI: 10.1007/s00289-019-02927-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
24
|
Raza A, Qumar U, Hassan J, Ikram M, Ul-Hamid A, Haider J, Imran M, Ali S. A comparative study of dirac 2D materials, TMDCs and 2D insulators with regard to their structures and photocatalytic/sonophotocatalytic behavior. APPLIED NANOSCIENCE 2020. [DOI: 10.1007/s13204-020-01475-y] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
|
25
|
Baqiya MA, Nugraheni AY, Islamiyah W, Kurniawan AF, Ramli MM, Yamaguchi S, Furukawa Y, Soontaranon S, Putra EGR, Cahyono Y, Risdiana, Darminto. Structural study on graphene-based particles prepared from old coconut shell by acid–assisted mechanical exfoliation. ADV POWDER TECHNOL 2020. [DOI: 10.1016/j.apt.2020.02.039] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
|
26
|
Khose RV, Wadekar PH, Pethsangave DA, Chakraborty G, Ray AK, Some S. Novel approach towards the synthesis of highly efficient flame retardant electrode and oil/organic solvent absorber. CHEMOSPHERE 2020; 246:125785. [PMID: 31927374 DOI: 10.1016/j.chemosphere.2019.125785] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Revised: 12/27/2019] [Accepted: 12/28/2019] [Indexed: 06/10/2023]
Abstract
We have developed a facile one pot process to synthesize an ultra-light functionalized spongy graphene (FSG). This is the first approach to use carbon based flame retardant spongy material as an electrode to build completely flame retardant supercapacitor (FRS) also as an oil/organic solvent absorber. The fully FRS concept has created by the compilation of as-prepared FSG with flame retardant separator and electrolyte. As-prepared FSG contained high amount of phosphorus and nitrogen functional groups, which makes it potent flame retardant electrochemical material, to use it as an efficient FR electrode. Flame test of FSG revealed that it doesn't catch fire for ∼1500 s. Also, FSG was able to sustain flame retardancy at a temperature as high as 1500 °C for continuous exposure of ∼300 s. FSG used as an electrode for symmetric capacitor possessing maximum specific capacitance of 494.3 F g-1 at a current density 1 A g-1. Corresponding high energy density and power density values are 55.6 Wh kg-1 and 1799 W kg-1. It shows cycling stability of 86.1% after 5000 cycles at current density of 10 A g-1. The electrochemical property of FSG was also confirmed using three electrode system. Flame retardant FSG material was also used for the absorption and recovery of oil and organic solvents. FSG has high oil and organic solvent sorption capacity in the range of 40-70 g/g, also can be reused for minimum 10 cycles. Such approach has great significance for multifunctional graphene based nanocomposites will open the new window for large-scale applications.
Collapse
Affiliation(s)
- Rahul V Khose
- Department of Dyestuff Technology, Institute of Chemical Technology, Matunga, Mumbai, 400019, India
| | - Pravin H Wadekar
- Department of Dyestuff Technology, Institute of Chemical Technology, Matunga, Mumbai, 400019, India
| | - Dattatray A Pethsangave
- Department of Dyestuff Technology, Institute of Chemical Technology, Matunga, Mumbai, 400019, India
| | - Goutam Chakraborty
- Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | - Alok K Ray
- Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai, 400085, India; Homi Bhabha National Institute (HBNI), Mumbai, 400094, India
| | - Surajit Some
- Department of Dyestuff Technology, Institute of Chemical Technology, Matunga, Mumbai, 400019, India.
| |
Collapse
|
27
|
Ikram M, Raza A, Imran M, Ul-Hamid A, Shahbaz A, Ali S. Hydrothermal Synthesis of Silver Decorated Reduced Graphene Oxide (rGO) Nanoflakes with Effective Photocatalytic Activity for Wastewater Treatment. NANOSCALE RESEARCH LETTERS 2020; 15:95. [PMID: 32346803 PMCID: PMC7188753 DOI: 10.1186/s11671-020-03323-y] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Accepted: 04/13/2020] [Indexed: 05/21/2023]
Abstract
Graphene oxide (GO) was obtained through modified hummers method, and reduced graphene oxide (rGO) was acquired by employing heat treatment. Various concentrations (2.5, 5, 7.5, and 10 wt. %) of silver (Ag) were incorporated in GO nanosheets by adopting hydrothermal approach. Synthesized Ag decorated rGO photocatalyst Ag/rGO was characterized using X-ray diffraction (XRD) to determine phase purity and crystal structure. XRD patterns showed the formation of GO to Ag/rGO. Molecular vibration and functional groups were determined through Fourier Transform Infrared spectroscopy (FTIR). Optical properties and a decrease in bandgap with insertion of Ag were confirmed with UV-Visible (Uv-Vis) spectrophotometer and photoluminescence (PL). Electronic properties and disorders in carbon structures were investigated through Raman spectroscopy that revealed the existence of characteristic bands (D and G). Surface morphology of prepared samples was examined with field emission scanning electron microscope (FESEM). Homogeneous distribution, size, and spherical shape of Ag NPs over rGO sheets were further confirmed with the help of high-resolution transmission electron microscope (HR-TEM). Dye degradation of doped and undoped samples was examined through Uv-Vis spectra. Experimental results indicated that photocatalytic activity of Ag@rGO enhanced with increased doping ratio owing to diminished electron-hole pair recombination. Therefore, it is suggested that Ag@rGO can be used as a beneficial and superior photocatalyst to clean environment and wastewater.
Collapse
Affiliation(s)
- Muhammad Ikram
- Solar Cell Applications Research Lab, Department of Physics, Government College University Lahore, Lahore, Punjab 54000 Pakistan
| | - Ali Raza
- Department of Physics, Riphah Institute of Computing and Applied Sciences (RICAS), Riphah International University, 14 Ali Road, Lahore, Pakistan
| | - Muhammad Imran
- State key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Centre for Soft Matter Science and Engineering, Beijing Engineering Center for Hierarchical Catalysts, Beijing University of Chemical Technology, Beijing, 100029 China
| | - Anwar Ul-Hamid
- Center for Engineering Research, Research Institute, King Fahd University of Petroleum & Minerals, Dhahran, 31261 Saudi Arabia
| | - Atif Shahbaz
- Department of Physics, Government College University Lahore, Lahore, Punjab 54000 Pakistan
| | - Salamat Ali
- Department of Physics, Riphah Institute of Computing and Applied Sciences (RICAS), Riphah International University, 14 Ali Road, Lahore, Pakistan
| |
Collapse
|
28
|
Vengatesan MR, Alhseinat E, Arangadi AF, Anwer S, Kannangara YY, Song JK, Banat F. Ag-doped sepiolite intercalated graphene nanostructure for hybrid capacitive deionization system. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2019.115799] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
29
|
Shirhatti V, Kedambaimoole V, Nuthalapati S, Neella N, Nayak MM, Rajanna K. High-range noise immune supersensitive graphene-electrolyte capacitive strain sensor for biomedical applications. NANOTECHNOLOGY 2019; 30:475502. [PMID: 31430732 DOI: 10.1088/1361-6528/ab3cd2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
This paper presents development and performance assessment of an innovative and a highly potent graphene-electrolyte capacitive sensor (GECS) based on the supercapacitor model. Although graphene has been widely researched and adapted in supercapacitors as electrode material, this combination has not been applied in sensor technology. A low base capacitance, generally the impeding factor in capacitive sensors, is addressed by incorporating electric double layer capacitance in GECS, and a million-fold increase in base capacitance is achieved. The high base capacitance (∼22.0 μF) promises to solve many inherent issues pertaining to capacitive sensors. GECS is fabricated by using thermally reduced microwave exfoliated graphene oxide material to form interdigitated electrodes coated with solid-state electrolyte which forms the double layer capacitance. The capacitance response of GECS on subjecting to strain is examined and an enormous operating range (∼300 nF) is seen, which is the salient feature of this sensor. The GECS showed an impressive device sensitivity of 11.24 nF kPa-1 and good immunity towards noise i.e. lead capacitance and stray capacitance. Two regimes of operation are identified based on the procedure of device fabrication. The device can be applied to varied applications and one such biomedical application of breath pattern monitoring is demonstrated.
Collapse
Affiliation(s)
- Vijay Shirhatti
- Dept. of Instrumentation and Applied Physics, Indian Institute of Science, Bangalore, India
| | | | | | | | | | | |
Collapse
|
30
|
Gupta S, Narayan J. Reduced Graphene Oxide/Amorphous Carbon P-N Junctions: Nanosecond Laser Patterning. ACS APPLIED MATERIALS & INTERFACES 2019; 11:24318-24330. [PMID: 31184475 DOI: 10.1021/acsami.9b05374] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The device integration of graphene and reduced graphene oxide (rGO) is impeded by scalability and high temperature (>2000 K) treatment required for effective reduction into high-quality rGO. In this article, we present a novel approach for direct laser writing of heavily reduced graphene oxide films by nanosecond laser melting of amorphous carbon on silicon (001) substrates under ambient conditions. Ultrafast quenching from the undercooled melt state above the melting threshold energy density (Ed) of 0.4 J/cm2 leads to the formation of large-area rGO films. The first-order phase transformation of liquid carbon into graphene is triggered by low undercooling at the C melt/silicon interface. The laser-irradiated rGO films exhibit electron mobility of 12.56 cm2/V s and charge carrier concentration of -1.2 × 1021/cm3 at 300 K. Temperature-dependent electrical measurements and Raman spectroscopic investigations suggest low disorder and charge transport via 2D Mott variable range hopping between the graphene islands for rGO films. The localization length corresponding to the size of these graphitic domains is 3 nm. The ultrafast regrowth of rGO creates an atomically sharp interface between n-type rGO and p-type amorphous carbon, resulting in p-n junction heterojunction diodes with a turn-on voltage of 0.3 V, rectification ratio of 110@±1.5 V, and activation energy of 0.13 eV under reverse bias. This unique laser processing method solves the problems of traps and defects associated with equilibrium-based rGO fabrication methods, enabling high conductivity and mobility, providing insights into the fundamental mechanism driving laser writing of graphene-based materials on silicon.
Collapse
Affiliation(s)
- Siddharth Gupta
- Department of Materials Science and Engineering , North Carolina State University , Centennial Campus , Raleigh , North Carolina 27695-7907 , United States
| | - Jagdish Narayan
- Department of Materials Science and Engineering , North Carolina State University , Centennial Campus , Raleigh , North Carolina 27695-7907 , United States
| |
Collapse
|
31
|
Peng X, Xu X, Huang F, Liu Q, Liu L. Graphene Oxide and Its Derivatives: Their Synthesis and Use in Organic Synthesis. CURR ORG CHEM 2019. [DOI: 10.2174/1385272823666190213122158] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Since Geim and co-workers reported their groundbreaking experiments on graphene, research on
graphene oxide (GO) and its derivatives has greatly influenced the field of modern physics, chemistry, device
fabrication, material science, and nanotechnology. The unique structure and fascinating properties of these carbon
materials can be ascribed to their eminent chemical, electronic, electrochemical, optical, and mechanical
properties of GO and its derivatives, particularly compared to other carbon allotropes. The present Review
aims to provide an overview on the recent developments in the preparation of GO and its derivatives and their
applications in organic reactions. We will first outline the synthesis of GO and its derivatives. Then, we will
discuss the major sections about their application as stoichiometric and catalytic oxidants in organic reactions,
a particular emphasis on the carbon-carbon, carbon-oxygen, and carbon-nitrogen single bond-forming reactions,
as well as carbon-oxygen and carbon-nitrogen double bond-forming reactions. Simultaneously, this Review
also describes briefly transition metal supported on GO or its derivatives as a catalyst for organic reaction.
Lastly, we will present an outlook of potential areas where GO and its derivatives may be expected to find
utility or opportunity for further growth and study.
Collapse
Affiliation(s)
- Xiangjun Peng
- School of Pharmaceutical Science, Gannan Medical University, Ganzhou, Jiangxi 341000, China
| | - Xianyun Xu
- School of Pharmaceutical Science, Gannan Medical University, Ganzhou, Jiangxi 341000, China
| | - Fujiang Huang
- Department of Chemistry and Chemical Engineering, Gannan Normal University, Ganzhou, Jiangxi 341000, China
| | - Qian Liu
- School of Pharmaceutical Science, Gannan Medical University, Ganzhou, Jiangxi 341000, China
| | - Liangxian Liu
- Department of Chemistry and Chemical Engineering, Gannan Normal University, Ganzhou, Jiangxi 341000, China
| |
Collapse
|
32
|
Jo J, Lee S, Gim J, Song J, Kim S, Mathew V, Alfaruqi MH, Kim S, Lim J, Kim J. Facile synthesis of reduced graphene oxide by modified Hummer's method as anode material for Li-, Na- and K-ion secondary batteries. ROYAL SOCIETY OPEN SCIENCE 2019; 6:181978. [PMID: 31183129 PMCID: PMC6502357 DOI: 10.1098/rsos.181978] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Accepted: 03/26/2019] [Indexed: 06/09/2023]
Abstract
Reduced graphene oxide (rGO) sheets were synthesized by a modified Hummer's method without additional reducing procedures, such as chemical and thermal treatment, by appropriate drying of graphite oxide under ambient atmosphere. The use of a moderate drying temperature (250°C) led to mesoporous characteristics with enhanced electrochemical activity, as confirmed by electron microscopy and N2 adsorption studies. The dimensions of the sheets ranged from nanometres to micrometres and these sheets were entangled with each other. These morphological features of rGO tend to facilitate the movement of guest ions larger than Li+. Impressive electrochemical properties were achieved with the rGO electrodes using various charge-transfer ions, such as Li+, Na+ and K+, along with high porosity. Notably, the feasibility of this system as the carbonaceous anode material for sodium battery systems is demonstrated. Furthermore, the results also suggest that the high-rate capability of the present rGO electrode can pave the way for improving the full cell characteristics, especially for preventing the potential drop in sodium-ion batteries and potassium-ion batteries, which are expected to replace the lithium-ion battery system.
Collapse
Affiliation(s)
- Jeonggeun Jo
- Department of Materials Science and Engineering, Chonnam National University, 300 Yongbong-dong, Bukgu, Gwangju 61186, Republic of Korea
| | - Seulgi Lee
- Department of Materials Science and Engineering, Chonnam National University, 300 Yongbong-dong, Bukgu, Gwangju 61186, Republic of Korea
| | - Jihyeon Gim
- Department of Materials Science and Engineering, Chonnam National University, 300 Yongbong-dong, Bukgu, Gwangju 61186, Republic of Korea
| | - Jinju Song
- Department of Materials Science and Engineering, Chonnam National University, 300 Yongbong-dong, Bukgu, Gwangju 61186, Republic of Korea
| | - Sungjin Kim
- Department of Materials Science and Engineering, Chonnam National University, 300 Yongbong-dong, Bukgu, Gwangju 61186, Republic of Korea
| | - Vinod Mathew
- Department of Materials Science and Engineering, Chonnam National University, 300 Yongbong-dong, Bukgu, Gwangju 61186, Republic of Korea
| | - Muhammad Hilmy Alfaruqi
- Department of Materials Science and Engineering, Chonnam National University, 300 Yongbong-dong, Bukgu, Gwangju 61186, Republic of Korea
| | - Seokhun Kim
- Department of Materials Science and Engineering, Chonnam National University, 300 Yongbong-dong, Bukgu, Gwangju 61186, Republic of Korea
| | - Jinsub Lim
- Korea Institute of Industrial Technology (KITECH), Buk-gu, Gwangju 61012, South Korea
| | - Jaekook Kim
- Department of Materials Science and Engineering, Chonnam National University, 300 Yongbong-dong, Bukgu, Gwangju 61186, Republic of Korea
| |
Collapse
|
33
|
Najjar A, Sabri S, Al-Gaashani R, Atieh MA, Kochkodan V. Antibiofouling Performance by Polyethersulfone Membranes Cast with Oxidized Multiwalled Carbon Nanotubes and Arabic Gum. MEMBRANES 2019; 9:membranes9020032. [PMID: 30813347 PMCID: PMC6410110 DOI: 10.3390/membranes9020032] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/20/2019] [Revised: 02/15/2019] [Accepted: 02/17/2019] [Indexed: 12/07/2022]
Abstract
Despite extensive research efforts focusing on tackling membrane biofouling, one of the biggest problems associated with membrane technology, there has been little headway in this area. This study presents novel polyethersulfone (PES) membranes synthesized via a phase inversion method at incremental loadings of functionalized oxidized multiwalled carbon nanotubes (OMWCNT) along with 1 wt. % arabic gum (AG). The synthesized OMWCNT were examined using scanning electron microscopy and transmission electron microscopy for morphological changes compared to the commercially obtained carbon nanotubes. Additionally energy-dispersive X-ray spectroscopy was carried out on the raw and OMWCNT materials, indicating an almost 2-fold increase in oxygen content in the latter sample. The cast PES/OMWCNT membranes were extensively characterized, and underwent a series of performance testing using bovine serum albumin solution for fouling tests and model Gram-positive (Bacillus subtilis) and Gram-negative (Escherichia coli) bacterial species for anti-biofouling experiments. Results indicated that the composite PES membranes, which incorporated the OMWCNT and AG, possessed significantly stronger hydrophilicity and negative surface charge as evidenced by water contact angle and zeta potential data, respectively, when compared to plain PES membranes. Furthermore atomic force microscopy analysis showed that the PES/OMWCNT membranes exhibited significantly lower surface roughness values. Together, these membrane surface features were held responsible for the anti-adhesive nature of the hybrid membranes seen during biofouling tests. Importantly, the prepared membranes were able to inhibit bacterial colonization upon incubation with both Gram-positive and Gram-negative bacterial suspensions. The PES/OMWCNT membranes also presented more resilient normalized flux values when compared to neat PES and commercial membrane samples during filtration of both bacterial suspensions and real treated sewage effluents. Taken together, the results of this study allude to OMWCNT and AG as promising additives, for incorporation into polymeric membranes to enhance biofouling resistance.
Collapse
Affiliation(s)
- Ahmad Najjar
- College of Life and Health Sciences, Hamad Bin Khalifa University (HBKU), P.O. Box 34110 Doha, Qatar.
| | - Souhir Sabri
- Qatar Environment and Energy Research Institute (QEERI), Hamad Bin Khalifa University (HBKU), P.O. Box 34110 Doha, Qatar.
| | - Rashad Al-Gaashani
- Qatar Environment and Energy Research Institute (QEERI), Hamad Bin Khalifa University (HBKU), P.O. Box 34110 Doha, Qatar.
| | - Muataz Ali Atieh
- Qatar Environment and Energy Research Institute (QEERI), Hamad Bin Khalifa University (HBKU), P.O. Box 34110 Doha, Qatar.
| | - Viktor Kochkodan
- Qatar Environment and Energy Research Institute (QEERI), Hamad Bin Khalifa University (HBKU), P.O. Box 34110 Doha, Qatar.
| |
Collapse
|
34
|
Enhanced Fouling Resistance and Antibacterial Properties of Novel Graphene Oxide-Arabic Gum Polyethersulfone Membranes. APPLIED SCIENCES-BASEL 2019. [DOI: 10.3390/app9030513] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Membrane biofouling has proved to be a major obstacle when it comes to membrane efficiency in membrane-based water treatment. Solutions to this problem remain elusive. This study presents novel polyethersulfone (PES) membranes that are fabricated using the phase inversion method at different loadings of graphene oxide (GO) and 1 wt. % arabic gum (AG) as nanofiller and pore forming agents. Synthesized GO was examined using scanning electron microscopy (SEM) and transmission electron microscopy (TEM) for morphological studies and energy-dispersive X-ray spectroscopy (EDX) for elemental analysis. The prepared GO flakes showed a high content of oxygen-containing groups (~31%). The fabricated membranes were extensively characterized, including water contact angle analysis for hydrophilicity, zeta potential measurements for surface charge, SEM, total porosity and pore size measurements. The prepared membranes underwent fouling tests using bovine serum albumin (BSA) solutions and biofouling tests using model Gram-positive (Bacillus subtilis) and Gram-negative (Escherichia coli) bacterial suspensions as well as real treated sewage effluent (TSE). The results showed that the novel PES/GO membranes possessed strong hydrophilicity and negative surface charge with an increase in porosity, pore size and water flux. The PES/GO membranes exhibited superior antibacterial action against both Gram-positive and Gram-negative bacterial species, implicating PES membranes which incorporate GO and AG as novel membranes that are capable of high antibiofouling properties with high flux.
Collapse
|
35
|
Elucidation of an intrinsic parameter for evaluating the electrical quality of graphene flakes. Sci Rep 2019; 9:557. [PMID: 30679626 PMCID: PMC6346114 DOI: 10.1038/s41598-018-37010-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Accepted: 11/30/2018] [Indexed: 11/08/2022] Open
Abstract
A test method for evaluating the quality of graphene flakes, such as reduced graphene oxide (rGO) and graphene nanopowder (GNP), was developed in this study. The pelletizer was selected for a sampling tool, which enables us to formulate the flake sample as a measurable sample. Various parameters were measured from the pelletized sample in order to elucidate the best parameter for representing the quality of the graphene flakes in terms of their electrical properties. Based on the analysis of 4-probe measurement data on the pelletized sample, the best intrinsic parameter is volume resistivity (or volume conductivity) rather than resistivity (or conductivity). Additionally, the possible modification of a sample before and after the pressurization was investigated by electron microscopy and Raman spectroscopy. No significant modification was observed. The volume conductivity in the two types of the graphene was different from their individual conductivities by one order of magnitude. Based on the results of X-ray photoelectron spectroscopy and Raman spectroscopy measurements, the volume conductivity of the graphene flake samples was governed by the oxygen content in the sample. Our achievements will promote the effective use of powder-type graphene products for further applications.
Collapse
|
36
|
Cheedarala RK, Song JI. In situ generated hydrophobic micro ripples via π–π stacked pop-up reduced graphene oxide nanoflakes for extended critical heat flux and thermal conductivities. RSC Adv 2019; 9:31735-31746. [PMID: 35527973 PMCID: PMC9072717 DOI: 10.1039/c9ra04563e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Accepted: 09/07/2019] [Indexed: 12/02/2022] Open
Abstract
We report the synthesis of thermally heated pop-up reduced graphene oxide (Pop-rGO) and its nanofluid (Pop-rGO-Nf) in DI water for extended critical heat flux (CHF) in a nucleate pool boiling experiment. When Pop-rGO-Nf is boiled over a nichrome (NiCr) wire heater the CHF values were increased up to 132%, 156%, and 175% with increasing concentrations of 0.0005 vol%, 0.001 vol%, and 0.005 vol% at heat fluxes of q′′ = 264 333 kW m−2, 339 202 kW m−2, and 327 895 kW m−2, respectively, because of the higher surface area of 430 m2 g−1. We also found a decrease in the CHF value from 0.05 vol% (175%) to 0.01 vol% (153%) for Pop-rGO-Nf due to the nanofluid concentration reaching the saturation point. After nucleate pool boiling, the developed Pop-rGO-Nf built-up layer on the NiCr wire surface showed regular π–π stacking with novel micro-rippled structures having uniform nanocavities and nanochannels. The nanocavities strongly helped vapor bubbles to escape from the NiCr wire surface. In addition, the nanochannels were formed by hydrogen bonding of adjacent carboxyl groups of each Pop-rGO nanosheet. The surface hydrophobicity of the built-up layers increased with the increase of the concentration of the Pop-rGO-Nfs, and the surface morphology, roughness average (Ra) and hydrophobicity were determined using FE-SEM, AFM and contact angle (CA) analysis. In our present investigation, during and after the nucleate CHF experiments with Pop-rGO-Nfs, for the first time, we obtained a higher CHF value of 175% at 0.01 vol% and a higher CA of 118° obtained at 0.05 vol%, due to the increase in surface hydrophobicity and the novel micro-rippled structures. We anticipate that the present results suggest that pool boiling employing Pop-rGO-Nf can dissipate the critical heat flux of electronic chips to a greater extent, allowing the enhancement of the cooling performance in existing two-phase heat transfer devices. We report the synthesis of thermally heated pop-up reduced graphene oxide (Pop-rGO) and its nanofluid (Pop-rGO-Nf) in DI water for extended critical heat flux (CHF) in a nucleate pool boiling experiment.![]()
Collapse
Affiliation(s)
- Ravi Kumar Cheedarala
- Department of Mechanical Engineering
- Changwon National University
- Changwon
- Republic of Korea
| | - Jung Il Song
- Department of Mechanical Engineering
- Changwon National University
- Changwon
- Republic of Korea
| |
Collapse
|
37
|
Golestanzadeh M, Naeimi H. Palladium decorated on a new dendritic complex with nitrogen ligation grafted to graphene oxide: fabrication, characterization, and catalytic application. RSC Adv 2019; 9:27560-27573. [PMID: 35529209 PMCID: PMC9070579 DOI: 10.1039/c9ra04511b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2019] [Accepted: 08/15/2019] [Indexed: 12/05/2022] Open
Abstract
Immobilized Pd nanoparticles on a new ligand, namely, tris(pentaethylene-pentamine)triazine supported on graphene oxide (Pdnp-TPEPTA(L)-GO) was introduced as a novel and robust heterogeneous catalyst for use in C–C bond formation reaction. The Pdnp-TPEPTA(L)-GO catalyst was synthesized by complexation of Pd with TPEPTA as a ligand with high N-ligation sites that were supported on graphene oxide through 3-chloropropyltrimethoxysilane. The prepared catalyst was characterized using some microscopic and spectroscopic techniques. The TPEPTA(L)-GO substrate is a 2D heterogeneous catalyst with a high specific surface area and a large amount of N-ligation sites. The Pdnp-TPEPTA(L)-GO catalyst used in the C–C bond formation reaction between aryl or heteroaryl and phenylboronic acid derivatives was applied towards the synthesis of biaryl units in high isolated yields. Notably, a series of competing experiments were performed to establish the selectivity trends of the presented method. Also, this catalyst system was reusable at least six times without a significant decrease in its catalytic activity. Immobilized Pd nanoparticles on a new ligand, namely, tris(pentaethylene-pentamine)triazine supported on graphene oxide (Pdnp-TPEPTA(L)-GO) was introduced as a novel and robust heterogeneous catalyst for use in C–C bond formation reaction.![]()
Collapse
Affiliation(s)
- Mohsen Golestanzadeh
- Departetment of Organic Chemistry
- Faculty of Chemistry
- University of Kashan
- Kashan
- Iran
| | - Hossein Naeimi
- Departetment of Organic Chemistry
- Faculty of Chemistry
- University of Kashan
- Kashan
- Iran
| |
Collapse
|
38
|
Hosseini E, Zakertabrizi M, Habibnejad Korayem A, Chang Z. Mechanical and electromechanical properties of functionalized hexagonal boron nitride nanosheet: A density functional theory study. J Chem Phys 2018; 149:114701. [PMID: 30243282 DOI: 10.1063/1.5043252] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Hydroxylation as a technique is mainly used to alter the chemical characteristics of hexagonal boron nitride (h-BN), affecting physical features as well as mechanical and electromechanical properties in the process, the extent of which remains unknown. In this study, effects of functionalization on the physical, mechanical, and electromechanical properties of h-BN, including the interlayer distance, Young's modulus, intrinsic strength, and bandgaps were investigated based on density functional theory. It was found that functionalized layers of h-BN have an average distance of about 5.48 Å. Analyzing mechanical properties of h-BN revealed great dependence on the degree of functionalization. For the amorphous hydroxylated hexagonal boron nitride nanosheets (OH-BNNS), the Young's modulus moves from 436 to 284 GPa as the coverage of -OH increases. The corresponding variations in the Young's modulus of the ordered OH-BNNS with analogous coverage are bigger at 460-290 GPa. The observed intrinsic strength suggested that mechanical properties are promising even after functionalization. Moreover, the resulted bandgap reduction drastically enhanced the electrical conductivity of this structure under imposed strains. The results from this work pave the way for future endeavors in h-BN nanocomposites research.
Collapse
Affiliation(s)
- Ehsan Hosseini
- Department of Civil Engineering, Iran University of Science and Technology, Tehran, Iran
| | - Mohammad Zakertabrizi
- Department of Civil Engineering, Iran University of Science and Technology, Tehran, Iran
| | | | - Zhenyue Chang
- Department of Civil Engineering, Monash University, Melbourne, VIC 3800, Australia
| |
Collapse
|
39
|
Microwave-assisted polyol preparation of reduced graphene oxide nanoribbons supported platinum as a highly active electrocatalyst for oxygen reduction reaction. J APPL ELECTROCHEM 2018. [DOI: 10.1007/s10800-018-1235-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
40
|
Wadekar PH, Ahirrao DJ, Khose RV, Pethsangave DA, Jha N, Some S. Synthesis of Aqueous Dispersible Reduced Graphene Oxide by the Reduction of Graphene Oxide in Presence of Carbonic Acid. ChemistrySelect 2018. [DOI: 10.1002/slct.201800221] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Pravin H. Wadekar
- Department of Dyestuff Technology; Institute of Chemical Technology, Matunga; Mumbai-400 019 India
| | - Dinesh J. Ahirrao
- Department of Physics; Institute of Chemical Technology, Matunga; Mumbai-400 019 India
| | - Rahul V. Khose
- Department of Dyestuff Technology; Institute of Chemical Technology, Matunga; Mumbai-400 019 India
| | - Dattatray A. Pethsangave
- Department of Dyestuff Technology; Institute of Chemical Technology, Matunga; Mumbai-400 019 India
| | - Neetu Jha
- Department of Physics; Institute of Chemical Technology, Matunga; Mumbai-400 019 India
| | - Surajit Some
- Department of Dyestuff Technology; Institute of Chemical Technology, Matunga; Mumbai-400 019 India
| |
Collapse
|
41
|
Ni Y, Chen Z, Kong F, Qiao Y, Kong A, Shan Y. Pony-size Cu nanoparticles confined in N-doped mesoporous carbon by chemical vapor deposition for efficient oxygen electroreduction. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.04.002] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
|
42
|
Current Progress of Si/Graphene Nanocomposites for Lithium-Ion Batteries. C — JOURNAL OF CARBON RESEARCH 2018. [DOI: 10.3390/c4010018] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
|
43
|
Savchak M, Borodinov N, Burtovyy R, Anayee M, Hu K, Ma R, Grant A, Li H, Cutshall DB, Wen Y, Koley G, Harrell WR, Chumanov G, Tsukruk V, Luzinov I. Highly Conductive and Transparent Reduced Graphene Oxide Nanoscale Films via Thermal Conversion of Polymer-Encapsulated Graphene Oxide Sheets. ACS APPLIED MATERIALS & INTERFACES 2018; 10:3975-3985. [PMID: 29286620 DOI: 10.1021/acsami.7b16500] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Despite noteworthy progress in the fabrication of large-area graphene sheetlike nanomaterials, the vapor-based processing still requires sophisticated equipment and a multistage handling of the material. An alternative approach to manufacturing functional graphene-based films includes the employment of graphene oxide (GO) micrometer-scale sheets as precursors. However, search for a scalable manufacturing technique for the production of high-quality GO nanoscale films with high uniformity and high electrical conductivity is still continuing. Here we show that conventional dip-coating technique can offer fabrication of high quality mono- and bilayered films made of GO sheets. The method is based on our recent discovery that encapsulating individual GO sheets in a nanometer thick molecular brush copolymer layer allows for the nearly perfect formation of the GO layers via dip coating from water. By thermal reduction the bilayers (cemented by a carbon-forming polymer linker) are converted into highly conductive and transparent reduced GO films with a high conductivity up to 104 S/cm and optical transparency on the level of 90%. The value is the highest electrical conductivity reported for thermally reduced nanoscale GO films and is close to the conductivity of indium tin oxide currently in use for transparent electronic devices, thus making these layers intriguing candidates for replacement of ITO films.
Collapse
Affiliation(s)
| | | | | | | | - Kesong Hu
- School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - Ruilong Ma
- School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - Anise Grant
- School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | | | | | | | | | | | | | - Vladimir Tsukruk
- School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | | |
Collapse
|
44
|
Ramesh A, Jeyavelan M, Leo Hudson MS. Electrochemical properties of reduced graphene oxide derived through camphor assisted combustion of graphite oxide. Dalton Trans 2018; 47:5406-5414. [DOI: 10.1039/c8dt00626a] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
One-step synthesis of reduced graphene oxide (rGO) from graphite oxide (GO) using a camphor assisted combustion (CAC) process. The rGO with synthesis acquired carbon particles for improved supercapacitance.
Collapse
Affiliation(s)
- A. Ramesh
- Department of Physics
- Central University of Tamil Nadu
- Thiruvarur-610005
- India
| | - M. Jeyavelan
- Department of Physics
- Central University of Tamil Nadu
- Thiruvarur-610005
- India
| | | |
Collapse
|
45
|
Baptista-Pires L, Orozco J, Guardia P, Merkoçi A. Architecting Graphene Oxide Rolled-Up Micromotors: A Simple Paper-Based Manufacturing Technology. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2018; 14:1702746. [PMID: 29171716 DOI: 10.1002/smll.201702746] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Revised: 09/18/2017] [Indexed: 05/27/2023]
Abstract
A graphene oxide rolled-up tube production process is reported using wax-printed membranes for the fabrication of on-demand engineered micromotors at different levels of oxidation, thickness, and lateral dimensions. The resultant graphene oxide rolled-up tubes can show magnetic and catalytic movement within the addition of magnetic nanoparticles or sputtered platinum in the surface of graphene-oxide-modified wax-printed membranes prior to the scrolling process. As a proof of concept, the as-prepared catalytic graphene oxide rolled-up micromotors are successfully exploited for oil removal from water. This micromotor production technology relies on an easy, operator-friendly, fast, and cost-efficient wax-printed paper-based method and may offer a myriad of hybrid devices and applications.
Collapse
Affiliation(s)
- Luis Baptista-Pires
- Nanobioelectronics and Biosensors Group, Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus de la UAB, 08193, Bellaterra, Barcelona, Spain
| | - Jahir Orozco
- Nanobioelectronics and Biosensors Group, Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus de la UAB, 08193, Bellaterra, Barcelona, Spain
| | - Pablo Guardia
- Nanobioelectronics and Biosensors Group, Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus de la UAB, 08193, Bellaterra, Barcelona, Spain
| | - Arben Merkoçi
- Nanobioelectronics and Biosensors Group, Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus de la UAB, 08193, Bellaterra, Barcelona, Spain
- ICREA, Passeig Lluis Companys, 23, 08010, Barcelona, Spain
| |
Collapse
|
46
|
Pethsangave DA, Khose RV, Wadekar PH, Some S. Deep Eutectic Solvent Functionalized Graphene Composite as an Extremely High Potency Flame Retardant. ACS APPLIED MATERIALS & INTERFACES 2017; 9:35319-35324. [PMID: 28901747 DOI: 10.1021/acsami.7b09587] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
We report a simple and green approach to develop the deep eutectic solvent functionalized graphene derivative as an effective flame retardant. The deep eutectic solvent functionalized graphene oxide (DESGO) was synthesized by introducing nitrogen-supported phosphorus functional groups on the surface of graphene derivative via a deep eutectic solvent, which is prepared by the treatment of monosodium dihydrogen orthophosphate and choline chloride. Subsequently, the resultant DESGO material is characterized by X-ray photoelectron spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy, thermogravimetric analysis, and scanning electron microscopy. The as prepared DESGO solution coated cloth piece was sustaining its initial shape and size by releasing a little amount of smoke at the early stage without catching fire for more than 540 s (9 min), whereas the pristine cloth is totally burned out within 10 s, leaving small amounts of black mass. This simple method of directly functionalized deep eutectic solvent on a graphene oxide surface can be a common process for the cost-effective bulk production of a nano carbon template for extremely high potency, nontoxic flame retardant applications.
Collapse
Affiliation(s)
- Dattatray A Pethsangave
- Department of Dyestuff Technology, Institute of Chemical Technology , Matunga, Mumbai 400 019, India
| | - Rahul V Khose
- Department of Dyestuff Technology, Institute of Chemical Technology , Matunga, Mumbai 400 019, India
| | - Pravin H Wadekar
- Department of Dyestuff Technology, Institute of Chemical Technology , Matunga, Mumbai 400 019, India
| | - Surajit Some
- Department of Dyestuff Technology, Institute of Chemical Technology , Matunga, Mumbai 400 019, India
| |
Collapse
|
47
|
Fan X, Kong F, Kong A, Chen A, Zhou Z, Shan Y. Covalent Porphyrin Framework-Derived Fe 2P@Fe 4N-Coupled Nanoparticles Embedded in N-Doped Carbons as Efficient Trifunctional Electrocatalysts. ACS APPLIED MATERIALS & INTERFACES 2017; 9:32840-32850. [PMID: 28872833 DOI: 10.1021/acsami.7b11229] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
A new porous covalent porphyrin framework (CPF) filled with triphenylphosphine was designed and synthesized using the rigid tetrakis(p-bromophenyl)porphyrin (TBPP) and 1,3,5-benzenetriboronic acid trivalent alcohol ester as building blocks. The carbonization of this special CPF has afforded coupled Fe2P and Fe4N nanoparticles embedded in N-doped carbons (Fe2P/Fe4N@N-doped carbons). This CPF serves as an "all in one" precursor of Fe, N, P, and C. The porous property and solid skeleton of the CPF endow Fe2P/Fe4N@N-doped carbons with porous structure and a high degree of graphitization. As a result, Fe2P/Fe4N@N-doped carbons exhibited highly efficient multifunctional electrocatalytic performance for water splitting and oxygen electroreduction. Typically, Fe2P/Fe4N@C-800, obtained at a heat-treatment temperature of 800 °C, showed an ORR half-wave potential of 0.80 V in alkaline media and 0.68 V in acidic media, close to that of commercial Pt/C catalysts. Fe2P/Fe4N@C-800 also displayed efficient OER and HER activities, comparable to other phosphide and nitride electrocatalysts. The coupled Fe4N and Fe2P nanoparticles embedded in carbons exert unique catalytic efficiency for water splitting and fuel cells.
Collapse
Affiliation(s)
- Xiaohong Fan
- School of Chemistry and Molecular Engineering, East China Normal University , Shanghai 200241, China
| | - Fantao Kong
- School of Chemistry and Molecular Engineering, East China Normal University , Shanghai 200241, China
| | - Aiguo Kong
- School of Chemistry and Molecular Engineering, East China Normal University , Shanghai 200241, China
| | - Aoling Chen
- School of Chemistry and Molecular Engineering, East China Normal University , Shanghai 200241, China
| | - Ziqian Zhou
- School of Chemistry and Molecular Engineering, East China Normal University , Shanghai 200241, China
| | - Yongkui Shan
- School of Chemistry and Molecular Engineering, East China Normal University , Shanghai 200241, China
| |
Collapse
|
48
|
Exploring High-Energy Li-I(r)on Batteries and Capacitors with Conversion-Type Fe3
O4
-rGO as the Negative Electrode. ChemElectroChem 2017. [DOI: 10.1002/celc.201700484] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
49
|
Multiphase nanostructured PANI anchored @ CVD grown MWCNT on rGO coated nickel foam for binder free supercapacitor electrode. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.05.012] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
50
|
Roy R, Thapa R, Chakrabarty S, Jha A, Midya PR, Kumar EM, Chattopadhyay KK. Role of oxygen functionality on the band structure evolution and conductance of reduced graphene oxide. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.03.079] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|