Artykuły w czasopismach: „Graphene Oxide Thin Film”

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Do Thi Thuy. "SYNTHESIS THIN FILM ELECTRODES GRAPHENE VIA NOVEL 3D PRINTALBE TECHNIQUE AND DETERMINE PROPERTY ELECTROCHEMICAL". Journal of Military Science and Technology, nr 75A (11.11.2021): 29–37. http://dx.doi.org/10.54939/1859-1043.j.mst.75a.2021.29-37.

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Graphene film electrodes have many important applications, but the fabriacion of these electrodes is difficult dues to the poor processing of graphene. This article describes the preliminary results of using 3D printing technology to fabricate thin-film electrodes from graphene oxide inks. Graphene oxide ink is synthesized by chemical method. The graphene oxide (GO) and reduction graphene oxide (r GO) thin film were chacracterized by filed scanning electron microscopy (FESEM) and Energy-dispersive X-ray spectrocopy (EDX spectrocopy) to make sure the morphological and optical characteristics of the thin film. In addition, the electrochemical aera active studies were also determined by cyclic voltametry (CV) curves. The r GO thin film displays higher electrochemical area active in comparison with GO, which is 2.56 cm2 compare to 0.31 cm2, indicating the best result for the superior conductivity of thin film electrode.

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Ahn, Ho Sang, Hye Jin Park, Ju Hyun Oh, Jin Chul Joo i Dong Joo Kim. "VOCs Sensing Property of Graphene Oxide Thin Film by Reduction Rate". Applied Mechanics and Materials 440 (październik 2013): 64–68. http://dx.doi.org/10.4028/www.scientific.net/amm.440.64.

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We demonstrate a combinatorial graphene oxide (GO) and reduced graphene oxide (rGO) thin film sensor fabricated by spin coating and dip casting method. Thermal treatment was followed to convert graphene oxide into reduced graphene oxide at different temperatures. 100ppm of evaporated methanol was utilized to examine the resistance profile of graphene oxide thin film and reduced graphene oxide thin film. Crystalline phase of GO and rGO were characterized by XRD. Surface roughness was observed by FE-SEM. Obvious opposite sensing property of GO and rGO were observed according to drying conditions.It was attributed to the change in number of radicals and type attached to the edge and surface of graphene oxide during reduction. Authors suggest that control of reduction rate by thermal treatment would be the one of the readiest approaches to enhance the selectivity of gas sensing in terms of direction of reaction.

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Kim, Daeok, i Ali Coskun. "Graphene oxide-templated preferential growth of continuous MOF thin films". CrystEngComm 18, nr 22 (2016): 4013–17. http://dx.doi.org/10.1039/c5ce02188j.

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Alazzam, Alamoodi, Abutayeh, Stiharu i Nerguizian. "Fabrication of Porous Gold Film Using Graphene Oxide as a Sacrificial Layer". Materials 12, nr 14 (18.07.2019): 2305. http://dx.doi.org/10.3390/ma12142305.

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An original and simple fabrication process to produce thin porous metal films on selected substrates is reported. The fabrication process includes the deposition of a thin layer of gold on a substrate, spin coating of a graphene oxide dispersion, etching the gold film through the graphene oxide layer, and removing the graphene oxide layer. The porosity of the thin gold film is controlled by varying the etching time, the thickness of the gold film, and the concentration of the graphene oxide dispersion. Images by scanning electron and metallurgical microscopes show a continuous gold film with random porosity formed on the substrate with a porosity size ranging between hundreds of nanometers to tens of micrometers. This general approach enables the fabrication of porous metal films using conventional microfabrication techniques. The proposed process is implemented to fabricate electrodes with patterned porosity that are used in a microfluidic system to manipulate living cells under dielectrophoresis. Porous electrodes are found to enhance the magnitude and spatial distribution of the dielectrophoretic force.

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Abdul Hussein, Adi Mahmood, Sallal Abdulhadi Abdullah, Mohammed RASHEED i Rafid Sabbar Zamel. "Optical and Electrical Properties of Glass/Graphene Oxide Thin Films". Iraqi Journal of Physics (IJP) 18, nr 47 (30.11.2020): 73–83. http://dx.doi.org/10.30723/ijp.v18i47.617.

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The study effect Graphene on optical and electrical properties of glass prepared on glass substrates using sol–gel dip-coating technique. The deposited film of about (60-100±5%) nm thick. Optical and electrical properties of the films were studied under different preparation conditions, such as graphene concentration of 2, 4, 6 and 8 wt%. The results show that the optical band gap for glass-graphene films decreasing after adding the graphene. Calculated optical constants, such as transmittance, extinction coefficient are changing after adding graphene. The structural morphology and composition of elements for the samples have been demonstrated using SEM and EDX. The electrical properties of films include DC electrical conductivity; we found an increasing in current as graphene concentration increases.

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Jaafar, E., Muhammad Kashif, S. K. Sahari i Z. Ngaini. "Study on Morphological, Optical and Electrical Properties of Graphene Oxide (GO) and Reduced Graphene Oxide (rGO)". Materials Science Forum 917 (marzec 2018): 112–16. http://dx.doi.org/10.4028/www.scientific.net/msf.917.112.

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In this work, graphene oxide (GO) is synthesized via chemical method (improved method) and reduced grapheneoxide(rGO) using thermal treatment. The GO and rGO thin films were coated on a glass substrate by using drop casting method. The GO and rGO thin film were characterized by scanningelectronmicroscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR) to make sure the morphological and optical characteristics of the thin film. In addition, the electrical studies were performed by current-voltage (I-V) characteristic. The rGO thin film displays higher conductivity in comparison with GO which is 4.12 x 10-5S/cm, and also affected the morphological (SEM) and optical properties (FTIR). Morphological and optical data confirms that rGO losses the oxygen groups compare to GO.

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ZHU, JIAYI, i JUNHUI HE. "SELF-ASSEMBLY FABRICATION OF GRAPHENE-BASED MATERIALS WITH OPTICAL–ELECTRONIC, TRANSIENT OPTICAL AND ELECTROCHEMICAL PROPERTIES". International Journal of Nanoscience 11, nr 06 (grudzień 2012): 1240032. http://dx.doi.org/10.1142/s0219581x12400327.

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Directed self-assembly of nano or microsized materials as building blocks is a very exciting research topic to construct large-scale but still uniform 2D or 3D architectures. Graphene shows great potential as an advanced building block for fabricating varied graphene-based functional films or architectures together with other metal, metal oxide and semiconductor nanomaterials. In our work, we demonstrated an approach to fabrication of flexible, transparent conductive thin films via layer-by-layer (LbL) assembly of oppositely charged reduced graphene oxides (RGOs). The graphene thin films showed remarkable optical–electronic properties. Inspired by this, we further fabricated transparent conductive hybrid thin film via LbL assembly of oppositely charged RGO nanosheets and Pt nanoparticles. The graphene– Pt hybrid thin film showed transient optical property as well as appropriate conductive and wetting properties. Moreover, we demonstrated graphene wrapped- MnO2 (GW- MnO2 ) nanocomposites by self-assembly of honeycomb MnO2 nanospheres and graphene sheets via an electrostatic co-precipitation method. The hybrid materials had a good electrochemical performance.

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Bolhan, Aisyah, Norasikin Ahmad Ludin, Najah Syahirah Mohd Nor, Mohd Adib Ibrahim, Suhaila Sepeai, Mohd Asri Mat Teridi, Kamaruzzaman Sopian i Azami Zaharim. "Catalytic Performance of Pt/rGO using Stacked Layer Technique for DSSC Counter Electrode". Jurnal Kejuruteraan 31, nr 1 (30.04.2019): 115–22. http://dx.doi.org/10.17576/jkukm-2019-31(1)-14.

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The stacked layer technique of platinum (Pt) and reduce graphene oxide (rGO) counters electrode thin film fabricated by using doctor blade method was prepared. The first layer with direct intact on fluorine doped tin oxide (FTO) glass substrate was graphene thin film and second layer on top of graphene layer was Pt thin film. X-ray diffraction (XRD) and atomic force microscopy (AFM) were performed on the thin films to determine the formation of crystallite structure and the surface roughness of the thin films, respectively. The crystallite size was determined from XRD data and it shows that Pt/rGO-10 thin film has the suitable crystal size for a better catalytic activity. As for surface roughness analysis from AFM images, Pt and Pt/rGO thin films exhibit the rougher surface compared to rGO thin film. The thin films were further analysed using field emission scanning electron microscopy (FESEM) to observe the adhesion of Pt and rGO on FTO glass substrate in nanoscale image. The catalytic activity of each thin film was measured by cyclic voltammetry (CV). The Pt/rGO counter electrode of 10μl aqueous graphene oxide denoted as Pt/rGO-10 has high catalytic activity compare to Pt. The Pt/rGO-10 recorded the highest current density at -3.075 mA/cm-2 indicate a high catalytic activity at the counter electrode. Thus, Pt/rGO-10 counter electrode thin film deemed as comparable to conventional counter electrode material which is Pt. Therefore, Pt/rGO-10 counter electrode is expected to improve the performance of Dye-sensitized solar cell.

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Karlsson, Anton, Helena Grennberg i Stefan Johansson. "Graphene oxide microstructure control of electrosprayed thin films". RSC Advances 13, nr 2 (2023): 781–89. http://dx.doi.org/10.1039/d2ra06278j.

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Safa, Saeed, Rasoul Sarraf-Mamoori i Rouhollah Azimirad. "The Effects of Reduced Graphene Oxide (rGO) on ZnO Film UV-Detector". Advanced Materials Research 829 (listopad 2013): 577–82. http://dx.doi.org/10.4028/www.scientific.net/amr.829.577.

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In this work, pure and graphene incorporated ZnO thin films were prepared by solgel method on glass substrates and influence of graphene doping on the structural, electrical and optical properties of the films were studied. The results of Raman spectrum indicated the coexistence of ZnO and rGO in composite thin film. The FT-IR analysis of the composite sample showed that ZnO, ZnO-C heterojunction and C-C graphene skeletal peak are formed. The UV-Vis spectrum showed that both the transparency and band gap was partially decreased by graphene incorporation. The linear trend of I-V curve suggests an ohmic contact between ZnO and graphene nanosheets. In addition, the resistivity was decreased from 4.32×102 Ω.cm for pure ZnO film to 2.4×101 Ω.cm for composite film. The composite photodetector possessed a desirable signal to noise ratio and UV-sensitivity while the response time decreased to half of pure ZnO. The above results suggest that 0.225 wt.% rGO incorporation can improve the ultraviolet detection of ZnO thin film.

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Wang, Hong Jie, Li Guo Jin, Shuo Wang, Chao Wang i Tai Yang Liu. "Study on Dye-Sensitized Solar Cells Based on Graphene / Pt Counter Electrode". Advanced Materials Research 1056 (październik 2014): 25–29. http://dx.doi.org/10.4028/www.scientific.net/amr.1056.25.

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Graphene/platinum composite gel was prepared with chloroplatinic acid and graphene oxide (GO) as precursors by in-situ reduction method. Grapheme/platinum composite film as counter electrode was prepared on fluorine-doped tin oxide (FTO) glass by electro-hydrodynamic (EHD) method. Battery was assembled with nanoTiO2film as anode, N3 dye, and ionic liquid electrolyte. It was characterized by Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM) and X-ray Diffraction (XRD). Graphene/platinum composite film include very thin graphene layers, with platinum particles of an average dimension dispersed evenly in graphene layers. This device shows similar photoelectric conversion efficiency compared with platinum electrode under 100 mWcm-2(1 sun) AM1.5 illumination.

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Hsu, Chih-Hung, Jia-Ren Wu, Lung-Chien Chen, Po-Shun Chan i Cheng-Chiang Chen. "Enhanced Performance of Dye-Sensitized Solar Cells with Nanostructure Graphene Electron Transfer Layer". Advances in Materials Science and Engineering 2014 (2014): 1–4. http://dx.doi.org/10.1155/2014/107352.

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The utilization of nanostructure graphene thin films as electron transfer layer in dye-sensitized solar cells (DSSCs) was demonstrated. The effect of a nanostructure graphene thin film in DSSC structure was examined. The nanostructure graphene thin films provides a great electron transfer channel for the photogenerated electrons from TiO2to indium tin oxide (ITO) glass. Obvious improvements in short-circuit current density of the DSSCs were observed by using the graphene electron transport layer modified photoelectrode. The graphene electron transport layer reduces effectively the back reaction in the interface between the ITO transparent conductive film and the electrolyte in the DSSC.

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Ampaiwong, Jutamas, Pranee Rattanawaleedirojn, Kanokwan Saengkiettiyut, Nadnudda Rodthongkum, Pranut Potiyaraj i Niphaphun Soatthiyanon. "Reduced Graphene Oxide/Carboxymethyl Cellulose Nanocomposites: Novel Conductive Films". Journal of Nanoscience and Nanotechnology 19, nr 6 (1.06.2019): 3544–50. http://dx.doi.org/10.1166/jnn.2019.16120.

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Herein, carboxymethyl cellulose nanocomposite films incorporated with graphene oxide and reduced graphene oxide were successfully prepared by a novel approach for the first time, and their alternative properties compared with the original carboxymethyl cellulose films were disclosed. For carboxymethyl cellulose/reduced graphene oxide film preparation, sodium borohydride was used as a chemical reducing agent. The carboxymethyl cellulose films were prepared by using a solvent casting method, followed by an acid treatment to decrease the water solubility (98%) while enhancing the tensile strength (15%) and elastic modulus (32%) of the original carboxymethyl cellulose films. Overall, the addition of 1.0 wt% graphene oxide and reduced graphene oxide to the treated films increased the water solubility, water absorption, tensile properties and electrical conductivity. Particularly, the electrical conductivity was predominantly enhanced 1.3×105 times with graphene oxide and 2.2×105 times with reduced graphene oxide compared to the treated carboxymethyl cellulose film. The electrical conductivity of the treated carboxymethyl cellulose film also increased with an increase in reduced graphene oxide. The effects of reduced graphene oxide on the water solubility, water absorption, tensile properties and electrical conductivity of the treated carboxymethyl cellulose film were more pronounced than those of graphene oxide, especially for the electrical conductivity. In conclusion, graphene oxide and reduced graphene oxide might be alternative nanofillers for improving the carboxymethyl cellulose film properties. For the future applications, carboxymethyl cellulose/reduced graphene oxide films prepared by using this approach might be employed as alternative materials in electronic packagings and electrochemical biosensors.

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Pereira, Neuma, Julieta Carballo, Marcos Daniel Vozer Felisberto i Glaura Silva. "A Facile Production of Reduced Graphene Oxide Transparent Films in Polyethylene Terephthalate Substrates". Journal of Nano Research 72 (21.03.2022): 53–65. http://dx.doi.org/10.4028/p-110q6p.

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Graphene oxide and reduced graphene oxide films have widespread applications in many fields. There are several methods for preparing thin films of these materials in different substrates, but a method that offers low cost and high quality in thin-film fabrication is still lacking. Here, we report a low cost and easily scalable methodology to produce reduced graphene oxide conductive films in polyethylene terephthalate (PET) substrates from graphene oxide suspensions. In an environmentally friendly approach, the reduction process was carried out in a green chemistry fashion way using ascorbic acid as reduction agent. Graphene oxide was synthesized by modified Hummers' method and the coating was realized in a homemade dip-coating process. Films with light transmittance as high as 99% and surface resistance in the order of MΩ/sq were obtained with graphene oxide contents as low as 0.5 wt%. The increase in graphene oxide contents produced films with surface resistance as low as 13 kΩ/sq. These are very interesting results that allows these films to be considered for application in electromagnetic shielding and electrostatic dissipation.

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Wu, Hong Peng, Da Wei He, Yong Sheng Wang, Bing Yang Yang, Hai Teng Xu, Jing Feng Li, Hai Teng Wang, Ji Gang Wang i Ming Fu. "Preparation of Sandwich-Like TiO₂/Graphene/TiO₂ Films and its Application in Photocatalysis". Advanced Materials Research 465 (luty 2012): 80–85. http://dx.doi.org/10.4028/www.scientific.net/amr.465.80.

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Anatase nano-TiO2 film was prepared by sol-gel method and graphene oxide nanosheets synthesized by Hummers method were deposited on this TiO2 thin film. Another nano-TiO2 film was then deposited on the graphene film forming sandwich-like to avoid graphene layer peeled off. Scanning electron microscope shows that TiO2 particles layer with a diameter of about 20 nm were densely and uniformly deposited on both surfaces of the graphene layer to form a sandwich-like composite structure. The composite films exhibit excellent photocatalytic degradation to methyl orange and remains chemically stable in the whole process without anything exfoliation.

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Yu, Hui Yao, Ying Long Yao i Xiao Hua Wang. "Humidity Sensitive Properties of Graphene Oxide Investigated by Quartz Crystal Microbalance". Advanced Materials Research 1051 (październik 2014): 85–89. http://dx.doi.org/10.4028/www.scientific.net/amr.1051.85.

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Graphene oxide has been studied as sensing material for the humidity detection in this paper. At room temperature, graphene oxide was dissolved in water to prepare graphene oxide aqueous solution. This aqueous solution was distributed on the electrode surface of quartz crystal microbalance to form a thin film for humidity detection. The results of the experiment showed that the quartz crystal microbalance sensors with graphene oxide film have good response to the change of humidity. The maximum humidity sensitivity, during the humidity ranging from 10% to 90%RH (relative humidity), has achieved ~54Hz/%RH (relative humidity). The quartz crystal microbalance sensors with graphene oxide thin film have good stability and reproducibility properties. All results implied that the graphene oxide was a potential humidity sensing material for practical use.

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Tismanar, Ioana, Alexandru Cosmin Obreja, Octavian Buiu i Anca Duta. "TiO2–Graphene Oxide and TiO2–Reduced Graphene Oxide Composite Thin Films for Solar Photocatalytic Wastewater Treatment". Energies 15, nr 24 (12.12.2022): 9416. http://dx.doi.org/10.3390/en15249416.

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This research reports on Vis- and solar-active photocatalytic bi-layered films of TiO2 (layer 1) and a composite with TiO2 matrix and graphene oxide or reduced graphene oxide filler (layer 2) obtained by coupling two methods: spray pyrolysis deposition followed by spraying a diluted sol. The thin films crystallinity degree, surface morphology and elemental composition were recorded and the composites were tested in photo-degradation processes, using the standard 10 ppm methylene blue solution, under simulated UV + VIS irradiation conditions using an irradiance measured to be close to the natural one, in continuous flow process, at demonstrator scale; these results were compared with those recorded when using low irradiance values in static regime. The effect of the increase in the graphene oxide content was investigated in the concentration range 1.4%w...10%w and was found to increase the process efficiency. However, the photocatalytic efficiencies increased only by 15% at high irradiance values compared with the values recorded at low irradiance as result of the electron-hole recombination in the composite-thin film. Similar experiments were run using composites having reduced graphene oxide as filler. The interfaces developed between the matrix and the filler were discussed outlining the influence of the filler’s polarity. The thin films stability in aqueous medium was good, confirmed by the results that outlined no significant differences in the surface aspect after three successive photocatalytic cycles.

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Kovalchuk, A. A. "Structure and oxygen-sensitive properties of thin films of natural carbon". Journal of Physics: Conference Series 2316, nr 1 (1.08.2022): 012014. http://dx.doi.org/10.1088/1742-6596/2316/1/012014.

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Abstract Thin film carbon nanomaterials are widely studied and used as functional, conductive, reflective, and sensor coatings. In this work, films of natural graphene-based carbon are studied as a sensitive material for a gas sensor operating close to room temperature. The structural features of the films were studied by scanning electron microscopy and Raman spectroscopy. It has been found that the deposition of natural carbon on substrates with a conductive coatings of indium oxide and of indium tin oxide allows to obtain a thin films, represented by homogeneous carbon nets, in the nodes of which are globular nano-sized particles. Microwave conductivity measurements were carried out using a λ/4 coaxial resonator based on a symmetric two-wire line. The results demonstrated that films on substrates with deposited indium oxide and indium tin oxide desorb oxygen from various structural levels of graphene-based carbon.

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Xiao-Yan, ZHANG, SUN Ming-Xuan, SUN Yu-Jun, LI Jing, SONG Peng, SUN Tong i CUI Xiao-Li. "Photoelectrochemical Properties of Graphene Oxide Thin Film Electrodes". Acta Physico-Chimica Sinica 27, nr 12 (2011): 2831–35. http://dx.doi.org/10.3866/pku.whxb20112831.

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Valentini, Luca, i Bittolo Bon. "Plasma etching of polystyrene latex particles for the preparation of graphene oxide nanowalls". Journal of the Serbian Chemical Society 77, nr 12 (2012): 1701–7. http://dx.doi.org/10.2298/jsc121022137v.

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Graphene oxide nanowalls were prepared by casting a water dispersion of polystyrene latex particles onto a graphene oxide film followed by tetrafluoromethane plasma etching. Mild plasma etching conditions allow one to retain the oxygen functional groups on the graphene oxide nanowalls. It was found that the exposure to a xenon light source of such graphene oxide nanowalls coated with a gold thin film results in an increase of the electrical conductivity.

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Liu, Jinzhang, Dilini Galpaya, Marco Notarianni, Cheng Yan i Nunzio Motta. "Graphene-based thin film supercapacitor with graphene oxide as dielectric spacer". Applied Physics Letters 103, nr 6 (5.08.2013): 063108. http://dx.doi.org/10.1063/1.4818337.

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Choi, Eunmi, i Sunggyu Pyo. "Effect of Pulsed Light Irradiation on Patterning of Reduction Graphene Oxide-Graphene Oxide Interconnects for Power Devices". Coatings 11, nr 9 (30.08.2021): 1042. http://dx.doi.org/10.3390/coatings11091042.

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Reduction graphene oxide (r-GO) lines on graphene oxide (GO) films can be prepared by a photocatalytic reduction and photothermal reduction method. A mechanism of partial GO reduction by pulsed photon energy is identified for preparing patterned rGO-GO films. The photocatalytic reduction method efficiently reduces GO at low photon energies. The successful production of a patterned rGO-GO film without damage by the photo thermal reduction method is possible when an energy density of 6.0 or 6.5 J/m2 per pulse is applied to a thin GO film (thickness: 0.45 μm). The lowest resistance obtained for a photo-reduced rGO line is 0.9 kΩ sq−1. The GO-TiO2 pattern fabricated on the 0.23 μm GO-TiO2 composite sheet through the energy density of each pulse is 5.5 J/m2 for three pulses.

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Nam, Woo Hyun, Hyung Mo Jeong, Jong-Hyeong Lim, Jong-Min Oh, Hiesang Sohn, Won-Seon Seo, Jung Young Cho i Weon Ho Shin. "Charge Transport Behavior of Al-Doped ZnO Incorporated with Reduced Graphene Oxide Nanocomposite Thin Film". Applied Sciences 10, nr 21 (30.10.2020): 7703. http://dx.doi.org/10.3390/app10217703.

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ZnO is utilized as a promising material for various electronic and energy areas due to its outstanding chemical stability, abundance, non-toxicity, and low cost. However, controlling electronic transport properties of ZnO by facile strategy is still necessary for wider applications. Here, we synthesized reduced graphene oxide incorporated Al-doped ZnO nanocomposite thin film prepared by the electrospray deposition method and investigated the electronic transport behavior. The electron transport in pristine Al-doped ZnO thin film is strongly affected by grain boundary scattering, but significant enhancement of carrier mobility is observed in reduced graphene oxide-incorporated Al-doped ZnO nanocomposite thin film. The results demonstrate that this hybrid strategy with graphene has an important effect on the charge transport behavior in ZnO polycrystalline materials.

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Zhu, Jia Yi, i Jun Hui He. "Fabrication and its Transient Optical Properties of Graphene Thin Films". Materials Science Forum 743-744 (styczeń 2013): 892–902. http://dx.doi.org/10.4028/www.scientific.net/msf.743-744.892.

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Graphene thin films were fabricated via layer-by-layer (LbL) assembly of oppositely charged reduced graphene oxides (RGOs) and benign post-treatment. RGOs dispersions and thin films were characterized by means of transmission electron microscopy, UV-visible absorption spectrophotometer, Raman spectroscopy, and four-point probe. It was found that graphene thin films exhibited a significant increase in electrical conductivity after post-treatment. In addition, post-treatment and film thickness showed an effect on transient optical properties of graphene thin films. The transmittance (800 nm, pulse) of (RGO-PDDA+/RGO-O-)30 film decreased after post-treatment, and the transmittance (800 nm, pulse) of post-treated films decreased with increasing the number of LbL assembled bilayers.

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Goswami, S., M. Chakraborty i D. De. "Electro-Magnetic switching in NiO-Graphene film". IOP Conference Series: Materials Science and Engineering 1225, nr 1 (1.02.2022): 012051. http://dx.doi.org/10.1088/1757-899x/1225/1/012051.

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Abstract Nickel oxide (NiO) thin film is grown via pulse laser deposition (PLD) technique and it is trapped in between conducting graphene films deposited through the same technique. Epitaxial crystalline growth of both NiO and graphene films are confirmed from X-ray diffraction studies. Raman studies propose creation of pure graphene film with acceptable defects. Electrical transport of the NiO film reveal resistance switching properties for an wide range of temperature which is useful for resistive random access memory (RRAM) and electric-switch. Besides electrical switching, the transport properties of the NiO film depict a systematic response in influence of magnetic field. Resistance of the NiO film changed significantly with external magnetic field which makes the system useful as a magnetic-switch.

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Kruk, Tomasz, i Piotr Warszyński. "Conductive Nanofilms with Oppositely Charged Reduced Graphene Oxides as a Base for Electroactive Coatings and Sensors". Colloids and Interfaces 5, nr 2 (1.04.2021): 20. http://dx.doi.org/10.3390/colloids5020020.

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We demonstrate a method for the formation of multilayers composed of reduced graphene oxide (rGO), which can be used for transparent, conducting thin films. Using the layer-by-layer (LbL) assembly of positively and negatively charged GO sheets, we could obtain thin films with highly controllable sheet resistance. The natural negative charge of graphene oxide was turned to positive by the amidation reaction. After forming the multilayer films, the graphene oxide underwent thermal reduction at temperatures above 150 °C. The (rGO+/rGO−) films were characterized by UV-Vis and scanning electron microscopy (SEM), and their conductivity was measured by the four-point method. We found that after deposition of five (rGO+/rGO−), the coating structure reached the percolation limit, and the film resistance decreased more gradually to around 20 kΩ/sq for the films obtained by eleven deposition cycles with graphene oxide reduced at 250 °C. The formation of thin films on polyimide allows the forming of new flexible conductive materials, which can find applications, e.g., in biomedicine as new electroactive, low-cost, disposable sensors.

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Abunahla, Heba, Nahla Alamoodi, Anas Alazzam i Baker Mohammad. "Micro-Pattern of Graphene Oxide Films Using Metal Bonding". Micromachines 11, nr 4 (10.04.2020): 399. http://dx.doi.org/10.3390/mi11040399.

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Recently, graphene has been explored in several research areas according to its outstanding combination of mechanical and electrical features. The ability to fabricate micro-patterns of graphene facilitates its integration in emerging technologies such as flexible electronics. This work reports a novel micro-pattern approach of graphene oxide (GO) film on a polymer substrate using metal bonding. It is shown that adding ethanol to the GO aqueous dispersion enhances substantially the uniformity of GO thin film deposition, which is a great asset for mass production. On the other hand, the presence of ethanol in the GO solution hinders the fabrication of patterned GO films using the standard lift-off process. To overcome this, the fabrication process provided in this work takes advantage of the chemical adhesion between the GO or reduced GO (rGO) and metal films. It is proved that the adhesion between the metal layer and GO or rGO is stronger than the adhesion between the latter and the polymer substrate (i.e., cyclic olefin copolymer used in this work). This causes the removal of the GO layer underneath the metal film during the lift-off process, leaving behind the desired GO or rGO micro-patterns. The feasibility and suitability of the proposed pattern technique is confirmed by fabricating the patterned electrodes inside a microfluidic device to manipulate living cells using dielectrophoresis. This work adds great value to micro-pattern GO and rGO thin films and has immense potential to achieve high yield production in emerging applications.

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KADIM, Sinai Ramah, Haider Jabbar KADIM, Adel Kadim SHAKER i Abothur Ghanim ALMOHANA. "INVESTIGATION OF STRUCTURAL, MORPHOLOGY AND SELF-CLEANING PROPERTIES OF GO:AG, GO:SI AND GO:ZN NANO-COMPOSITES THIN FILMS SYNTHESIZED BY SPRAY PYROLYSIS TECHNIQUE". MINAR International Journal of Applied Sciences and Technology 03, nr 01 (1.03.2021): 16–26. http://dx.doi.org/10.47832/2717-8234.1-3.3.

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A wide variety of approaches have been explored by researchers in the attempt to attain a system with controllable wetting properties. The hydrophilic surfaces can be used in anti-fogging applications, biomedical, filtration, heat pipes, and many others. hydrophilic surface has strong affinity to water whereas hydrophobic surface repel water. In this research, the synthesis of graphene oxide- silver, graphene oxide- silica and graphene oxide-zinc nano-composite were done by spray pyrolysis method in order to investigate their self-cleaning properties. The nano-composite thin films were characterized by X-ray diffraction (XRD), field-emission transmission electron microscope (FE-SEM) . The xrd results confirm the formation of desired thin films. Atomic force microscope (AFM) was used to calculate the thickness and RMS value of thin films. RMS values for GO, GO:Ag, GO:Si and GO:Zn thin films were 17.57, 185.78, 125.64, 37.23 nm, respectively. According to the results of contact angle and AFM images, GO:Zn thin film has the lowest roughness and therefore the lowest contact angle and a relatively good hydrophilic surface.

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Lv, Ya Nan, Jian Fang Wang, Yin Long, Cheng An Tao, Lin Xia i Hui Zhu. "How Graphene Layers Depend on Drying Methods of Graphene Oxide". Advanced Materials Research 554-556 (lipiec 2012): 597–600. http://dx.doi.org/10.4028/www.scientific.net/amr.554-556.597.

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Abstract: Graphite oxide is of great importance in preparing graphene, the average layer of graphene depends on that of graphene oxide in some extent. In this paper, we prepared graphite oxide via H3PO4/H2SO4mixed acid, then which were dried by vacuum drying in a freezer dryer and drying oven respectively, the graphite oxide powder and thin film were obtained correspondingly. After dispersing the above two forms of graphite oxide in water by shaking, stirring or supersonic wave, they were reduced in the same condition. According to the XRD, AFM results, vacuum freeze-drying was inclined to gain few-lay graphene.

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Wu, Liang, Baishu Liu, Meiling Zhu, Dameng Guo, Han Wu, Liming Bian i Bo Zheng. "Patterning Perfluorinated Surface with Graphene Oxide and the Microarray Applications". Micromachines 10, nr 3 (1.03.2019): 173. http://dx.doi.org/10.3390/mi10030173.

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A method was developed to pattern the surface of perfluorinated materials with graphene oxide thin film, and various biological applications of the patterned perfluorinated surface were illustrated. Perfluorinated surfaces such as Teflon, Cytop, and other perfluorinated materials are known to be both hydrophobic and oleophobic, with low adhesion for most materials. Modifying the perfluorinated surfaces has been difficult due to the extraordinary chemical inertness, which limits the applications of perfluorinated materials as anti-fouling substrates. Herein we successfully patterned Cytop surfaces with graphene oxide. Patterns of the graphene oxide thin film with feature dimension down to 40 microns were formed and remained stable on the Cytop surface against washing with water, ethanol and acetone. The graphene oxide thin film on the Cytop surface allowed non-specific protein adsorption. To illustrate the applications of the patterned Cytop surface, we used the patterned Cytop surface as the substrate to study the protein-protein interactions, stem cell culture, and stem cell proliferation.

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Kammoun, M., S. Berg i H. Ardebili. "Flexible thin-film battery based on graphene-oxide embedded in solid polymer electrolyte". Nanoscale 7, nr 41 (2015): 17516–22. http://dx.doi.org/10.1039/c5nr04339e.

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A novel flexible thin-film lithium ion battery containing polyethylene oxide (PEO) with 1% graphene oxide (GO) nanosheets is fabricated that offers enhanced safety, flexibility, stability and high capacity.

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Cheon, Yeong Ah, Jin-Su Nam, Kyung Soo Son, Young Tae Im, Won Kee Ahn i Bong Geun Chung. "Development and Analysis of Graphene Oxide Thin Film Coating". Transactions of the Korean Society of Mechanical Engineers B 39, nr 5 (1.05.2015): 463–69. http://dx.doi.org/10.3795/ksme-b.2015.39.5.463.

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Jilani, S. Mahaboob, Tanesh D. Gamot i P. Banerji. "Thin-Film Transistors with a Graphene Oxide Nanocomposite Channel". Langmuir 28, nr 48 (15.11.2012): 16485–89. http://dx.doi.org/10.1021/la303554z.

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Jin, Meihua, Hae-Kyung Jeong, Woo Jong Yu, Dong Jae Bae, Bo Ram Kang i Young Hee Lee. "Graphene oxide thin film field effect transistors without reduction". Journal of Physics D: Applied Physics 42, nr 13 (18.06.2009): 135109. http://dx.doi.org/10.1088/0022-3727/42/13/135109.

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Vaněk, Jiri, i Radoslav Mach. "Electrical Conductivity of Reduced Graphene Oxide Thin-Film Layers". ECS Transactions 87, nr 1 (26.11.2018): 253–59. http://dx.doi.org/10.1149/08701.0253ecst.

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He, Qiyuan, Shixin Wu, Shuang Gao, Xiehong Cao, Zongyou Yin, Hai Li, Peng Chen i Hua Zhang. "Transparent, Flexible, All-Reduced Graphene Oxide Thin Film Transistors". ACS Nano 5, nr 6 (4.05.2011): 5038–44. http://dx.doi.org/10.1021/nn201118c.

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Heidari, B., A. Majdabadi, L. Naji, M. Sasani Ghamsari, Z. Fakharan i S. Salmani. "Thin reduced graphene oxide film with enhanced optical nonlinearity". Optik 156 (marzec 2018): 104–11. http://dx.doi.org/10.1016/j.ijleo.2017.10.176.

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Chakraborty, S., A. N. Resmi, P. Renuka Devi i K. B. Jinesh. "P-channel thin film transistors using reduced graphene oxide". Nanotechnology 28, nr 15 (15.03.2017): 155201. http://dx.doi.org/10.1088/1361-6528/aa628d.

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Khalid, Mohd, Milton A. Tumelero, Vinicius C. Zoldan, Cristiani C. Pla Cid, Dante F. Franceschini, Ronaldo A. Timm, Lauro T. Kubota, Stanislav A. Moshkalev i Andre A. Pasa. "Polyaniline nanofibers–graphene oxide nanoplatelets composite thin film electrodes for electrochemical capacitors". RSC Adv. 4, nr 64 (2014): 34168–78. http://dx.doi.org/10.1039/c4ra06145d.

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Terzioglu, Pınar, Yasin Altin, Ayse Kalemtas i Ayse Celik Bedeloglu. "Graphene oxide and zinc oxide decorated chitosan nanocomposite biofilms for packaging applications". Journal of Polymer Engineering 40, nr 2 (28.01.2020): 152–57. http://dx.doi.org/10.1515/polyeng-2019-0240.

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AbstractRecently, due to sustainable development and environmental protection policies, there is increasing interest in the development of new biodegradable polymer-based multifunctional composites. Chitosan is one of the most remarkable and preferred biopolymers, which is environmentally friendly as well as renewable, biocompatible, and inexpensive. Though it has a wide range of potential applications, the major limitation of chitosan – the problem of poor mechanical performance – needs to be solved. In this work, graphene oxide was first produced and then used to manufacture a chitosan/graphene oxide/zinc oxide composite film through a casting method. The properties of the chitosan film and the chitosan/graphene oxide/zinc oxide composite film were investigated using Fourier transform infrared spectroscopy, mechanical, thermal gravimetric, and ultraviolet (UV)-visible spectroscopy analyses. The results showed that the incorporation of graphene oxide and zinc oxide into the chitosan matrix resulted in enhanced mechanical properties and thermal stability of chitosan biocomposite films. The graphene oxide- and zinc oxide-reinforced chitosan film showed 2527 MPa and 55.72 MPa of Young’s modulus and tensile strength, respectively, while neat chitosan showed only 1549 MPa and 37.91 MPa of Young’s modulus and tensile strength, respectively. Conversely, the addition of graphene oxide decreased the transmittance, notably in the UV region.

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Naik, Gautam, i Sridhar Krishnaswamy. "Room-Temperature Humidity Sensing Using Graphene Oxide Thin Films". Graphene 05, nr 01 (2016): 1–13. http://dx.doi.org/10.4236/graphene.2016.51001.

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Wang, Wei, Shirui Guo, Mihrimah Ozkan i Cengiz S. Ozkan. "MnO2 Decorated Three Dimensional Graphene Heterostructures for Supercapacitor Electrodes". MRS Proceedings 1451 (2012): 63–68. http://dx.doi.org/10.1557/opl.2012.1334.

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ABSTRACTSupercapacitors are promising candidates for alternative energy storage applications since they can store and deliver energy at relatively high rates. In this work, we integrated large area chemical vapor deposition (CVD) grown three dimensional graphene heterostructures with high capacitance metal oxides (MnO2) to fabricate highly conductive, large surface-area composite thin films. Uniform, large area 3D graphene heterostructures layers were produced by a one-step CVD on nickel foams. MnO2 nanowires were deposited on the as-obtained 3D graphene heterostructures film by a simple chemical bath depostion process. The oxide loading of the 3D graphene/MWNTs/MnO2 nanowires (GMM) composite films can be simply controlled by deposition time and nanowire solution concentration. The surface morphology was investigated by scanning electron microscopy (SEM) and scanning transmission electron microscopy (STEM), and Energy-dispersive X-ray spectroscopy (EDS) was performed to characterize the MnO2on the surface of the film. By introducing the fast surface redox reactions into the graphene heterostructures film via integrating pseudocapacitive material like MnO2, the capacitive ability of the system enhanced dramatically. Supercapacitor was fabricated based on the 3D graphene heterostructures /MnO2 hybrid film electrodes; the measurements of cyclic voltammetry, and electrochemical impedance spectroscopy (EIS) are conducted to determine its performance for the electrodes of supercapacitors.

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LAI, S., M. CHEN, YU N. KHANIN, K. S. NOVOSELOV i D. V. ANDREEVA. "ENHANCEMENT OF REDUCED GRAPHENE OXIDE BOLOMETRIC PHOTORESPONSE VIA ADDITION OF GRAPHENE QUANTUM DOTS". Surface Review and Letters 28, nr 08 (17.07.2021): 2140011. http://dx.doi.org/10.1142/s0218625x21400114.

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Reduced graphene oxide (rGO) has attracted interest in its potential application in large area photodetectors owing to its ease of manufacture and wideband optical absorbance. Here, we report that thin rGO films produced via vacuum filtration of GO followed by reduction by immersion in L-ascorbic acid are capable of sensing light through a bolometric mechanism. The photoresponse of these rGO thin films can be further enhanced by dropcasting graphene quantum dots (GQDs) on the rGO surface. These GQDs were observed to increase the opacity of the rGO film and hence its absorptivity of light, thereby enabling a significant increase in the photoresponse of the device.

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Soroush, Adel, Wen Ma, Yule Silvino i Md Saifur Rahaman. "Surface modification of thin film composite forward osmosis membrane by silver-decorated graphene-oxide nanosheets". Environmental Science: Nano 2, nr 4 (2015): 395–405. http://dx.doi.org/10.1039/c5en00086f.

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Jiang, Youcheng, Shangzhi Song, Mengjuan Mi, Lixuan Yu, Lisha Xu, Puqing Jiang i Yilin Wang. "Improved Electrical and Thermal Conductivities of Graphene–Carbon Nanotube Composite Film as an Advanced Thermal Interface Material". Energies 16, nr 3 (30.01.2023): 1378. http://dx.doi.org/10.3390/en16031378.

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Thermal management has become a crucial issue for the rapid development of electronic devices, and thermal interface materials (TIMs) play an important role in improving heat dissipation. Recently, carbon−based TIMs, including graphene, reduced graphene oxide, and carbon nanotubes (CNTs) with high thermal conductivity, have attracted great attention. In this work, we provide graphene−carbon nanotube composite films with improved electrical and thermal conductivities. The composite films were prepared from mixed graphene oxide (GO) and CNT solutions and then were thermally reduced at a temperature greater than 2000 K to form a reduced graphene oxide (rGO)/CNT composite film. The added CNTs connect adjacent graphene layers, increase the interlayer interaction, and block the interlayer slipping of graphene layers, thereby improving the electrical conductivity, through−plane thermal conductivity, and mechanical properties of the rGO/CNT composite film at an appropriate CNT concentration. The rGO/CNT(4:1) composite film has the most desired properties with an electrical conductivity of ~2827 S/cm and an in−plane thermal conductivity of ~627 W/(m·K). The produced rGO/CNT composite film as a TIM will significantly improve the heat dissipation capability and has potential applications in thermal management of electronics.

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Jung, Jae Woong, Seung Hwan Son i Jun Choi. "Polyaniline/Reduced Graphene Oxide Composites for Hole Transporting Layer of High-Performance Inverted Perovskite Solar Cells". Polymers 13, nr 8 (14.04.2021): 1281. http://dx.doi.org/10.3390/polym13081281.

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We herein address the optoelectronic properties of polyaniline composite films with graphene oxide and reduced graphene oxide as a hole transport layer in inverted perovskite solar cells. The composite films exhibited enhanced electrical conductivity and suitable energy level matching with CH3NH3PbI3 for efficient hole extraction/transport than the pristine polyaniline film, which thus can deliver improved photovoltaic properties of device. The composite film-based devices exhibited maximum efficiency of 16.61%, which is enhanced by 21.6% from the device with the pristine polyaniline hole transport layer (efficiency = 13.66%). The reduced graphene oxide-based composite film also achieved improved long-term operative stability as compared to the pristine polyaniline-based device, demonstrating a great potential of reduced graphene oxide/polyaniline composite hole transport layer for high performance perovskite solar cells.

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Tamm, Aile, Tauno Kahro, Helle-Mai Piirsoo i Taivo Jõgiaas. "Atomic-Layer-Deposition-Made Very Thin Layer of Al2O3, Improves the Young’s Modulus of Graphene". Applied Sciences 12, nr 5 (27.02.2022): 2491. http://dx.doi.org/10.3390/app12052491.

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Nanostructures with graphene make them highly promising for nanoelectronics, memristor devices, nanosensors and electrodes for energy storage. In some devices the mechanical properties of graphene are important. Therefore, nanoindentation has been used to measure the mechanical properties of polycrystalline graphene in a nanostructure containing metal oxide and graphene. In this study the graphene was transferred, prior to the deposition of the metal oxide overlayers, to the Si/SiO2 substrate were SiO2 thickness was 300 nm. The atomic layer deposition (ALD) process for making a very thin film of Al2O3 (thickness comparable with graphene) was applied to improve the elasticity of graphene. For the alumina film the Al(CH3)3 and H2O were used as the precursors. According to the micro-Raman analysis, after the Al2O3 deposition process, the G-and 2D-bands of graphene slightly broadened but the overall quality did not change (D-band was mostly absent). The chosen process did not decrease the graphene quality and the improvement in elastic modulus is significant. In case the load was 10 mN, the Young’s modulus of Si/SiO2/Graphene nanostructure was 96 GPa and after 5 ALD cycles of Al2O3 on graphene (Si/SiO2/Graphene/Al2O3) it increased up to 125 GPa. Our work highlights the correlation between nanoindentation and defects appearance in graphene.

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Ishikawa, Ryousuke, Masashi Bando, Yasuyoshi Kurokawa, Adarsh Sandhu i Makoto Konagai. "Layer-by-layer assembled transparent conductive graphene films for solar cells application". MRS Proceedings 1451 (2012): 75–81. http://dx.doi.org/10.1557/opl.2012.1225.

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ABSTRACTThe potential of chemically derived graphene as a solution-processable transparent conductive film has been explored. Synthesis of amine-functionalized graphene oxide was intended for its utilization in layer-by-layer assembly. Layer-by-layer assembly of graphene oxide was utilized to fabricate graphene based thin film in a scalable and highly reproducible way. It was found that optical transmittance and sheet resistance of the film decreases with an increase in number of LBL cycles in a reproducible way. The sheet resistance of LBL-assembled GO film improves by an order of magnitude at the same optical transparency due to more homogeneous coverage and better stacking of graphene flakes. Furthermore, we demonstrated the potential for a large-scale deposition of chemically derived graphene.

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LEE, YOUNGBIN, i JONG-HYUN AHN. "GRAPHENE-BASED TRANSPARENT CONDUCTIVE FILMS". Nano 08, nr 03 (30.05.2013): 1330001. http://dx.doi.org/10.1142/s1793292013300016.

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Graphene is a promising alternative to indium tin oxide for use in transparent conducting electrodes. We review recent progress in production methods of graphene and its applications in optoelectronic devices such as touch panel screens, organic photovoltaic cells, organic light emitting diodes and thin film transistors. In addition, we discuss important criteria such as optical transmittance, electrical conductivity and work function, which are critical considerations in the integration of graphene conductive films with optoelectronic devices.

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Kim, Yo-Han, Huynh Quoc Nguyen, Bum Jun Park, Hyun Ho Lee i Tae Seok Seo. "Characteristics of a Multiple-Layered Graphene Oxide Memory Thin Film Transistor with Gold Nanoparticle Embedded as Charging Elements". Journal of Nanomaterials 2021 (15.01.2021): 1–9. http://dx.doi.org/10.1155/2021/6689861.

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In this study, we report the highest mobility in the reduced graphene oxide- (rGO-) based TFTs embedded with Au NPs. In addition, we fabricated a reduced graphene oxide memory device (rGO-capacitor), a reduced graphene oxide thin film transistor (rGO-TFT), and a reduced graphene oxide memory thin film transistor (rGO-MTFT) and characterized their electrical performances. While the rGO-TFT device was investigated for nonambipolar channel performance, the rGO-capacitor and rGO-MTFT were examined for nonvolatile memory capabilities in a metal-graphene-insulator-silicon (MGIS) structure. The incorporation of the gold nanoparticles (Au NPs) between the rGO and an insulator silicon dioxide (SiO2) layer served as a charging element. The rGO-capacitor revealed the memory effect of hysteretic capacitance-voltage (C-V) loops, and the flat-band voltage shift ( Δ V FB ) was measured as 0.1375 V after 100 s retention time. The rGO-TFT shows the p-channel characteristics with high hole mobility of 16.479 cm2/V⋅s. The threshold voltage shift ( Δ V th ) of the rGO-MTFT was detected as 5.74 V from 10 V to -30 V sweep, demonstrating high mobility of 22.887 cm2/V⋅s.

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