Journal articles: 'Graphene liquid interface'

1

Chen, Xianjue, and Colin L. Raston. "Liquid interface evolution of polyhedral-like graphene." Chemical Communications 51, no. 78 (2015): 14609–12. http://dx.doi.org/10.1039/c5cc05888k.

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Peng, Xiaoyi, Pengfei Jiang, Yulou Ouyang, Shuang Lu, Weijun Ren, and Jie Chen. "Reducing Kapitza resistance between graphene/water interface via interfacial superlattice structure." Nanotechnology 33, no. 3 (October 29, 2021): 035707. http://dx.doi.org/10.1088/1361-6528/ac2f5c.

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Abstract The control of thermal transport across solid/liquid interface has attracted great interests for efficient thermal management in the integrated devices. Based on molecular dynamics simulations, we study the effect of interfacial superlattice structure on the Kapitza resistance between graphene/water interface. Compared to the original interface, introducing interfacial superlattice structure can result in an obvious reduction of Kapitza resistance by as large as 40%, exhibiting a decreasing trend of Kapitza resistance with the decrease of superlattice period. Surprisingly, by analyzing the structure of water block and atomic vibration characteristics on both sides of the interface, we find the interfacial superlattice structure has a minor effect on the water structure and overlap in the vibrational spectrum, suggesting that the improved interfacial heat transfer is not mainly originated from the liquid block. Instead, the spectral energy density analysis reveals that phonon scattering rate in the interfacial graphene layer is significantly enhanced after superlattice decoration, giving rise to the increased thermal resistance between the interfacial graphene layer and its nearest neighboring layer. As this thermal resistance is coupled to the Kapitza resistance due to the local nature of interfacial superlattice decoration, the enhanced thermal resistance in the solid segment indirectly reduces the Kapitza resistance between graphene/water interface, which is supported by the enhancement of the spectral interfacial thermal conductance upon superlattce decoration at microscopic level. Our study uncovers the physical mechanism for controlling heat transfer across solid/liquid interface via interfacial superlattice structure, which might provide valuable insights for designing efficient thermal interfaces.

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Kam, Kevin, Brianne Tengan, Cody Hayashi, Richard Ordonez, and David Garmire. "Polar Organic Gate Dielectrics for Graphene Field-Effect Transistor-Based Sensor Technology." Sensors 18, no. 9 (August 23, 2018): 2774. http://dx.doi.org/10.3390/s18092774.

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We have pioneered the use of liquid polar organic molecules as alternatives to rigid gate-dielectrics for the fabrication of graphene field-effect transistors. The unique high net dipole moment of various polar organic molecules allows for easy manipulation of graphene’s conductivity due to the formation of an electrical double layer with a high-capacitance at the liquid and graphene interface. Here, we compare the performances of dimethyl sulfoxide (DMSO), acetonitrile, propionamide, and valeramide as polar organic liquid dielectrics in graphene field-effect transistors (GFETs). We demonstrate improved performance for a GFET with a liquid dielectric comprised of DMSO with high electron and hole mobilities of 154.0 cm2/Vs and 154.6 cm2/Vs, respectively, and a Dirac voltage <5 V.

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Shao, Jiao-Jing, Si-Da Wu, Shao-Bo Zhang, Wei Lv, Fang-Yuan Su, and Quan-Hong Yang. "Graphene oxide hydrogel at solid/liquid interface." Chemical Communications 47, no. 20 (2011): 5771. http://dx.doi.org/10.1039/c1cc11166c.

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Xin, Jing, Beibei Xie, Ya Li, Juanjuan Shang, Yujiao Qiu, Libing Liu, Shaofu Zhao, Lidan Fan, and Renjie Zhang. "Formation of graphene oxide films at the liquid/liquid interface." Composite Interfaces 21, no. 7 (May 19, 2014): 623–30. http://dx.doi.org/10.1080/15685543.2014.918789.

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Wehrhold, Michel, Tilmann J. Neubert, Anur Yadav, Martin Vondráček, Rodrigo M. Iost, Jan Honolka, and Kannan Balasubramanian. "pH sensitivity of interfacial electron transfer at a supported graphene monolayer." Nanoscale 11, no. 31 (2019): 14742–56. http://dx.doi.org/10.1039/c9nr05049c.

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Patil, Sagar H., Bihag Anothumakkool, Shivaram D. Sathaye, and Kashinath R. Patil. "Architecturally designed Pt–MoS2 and Pt–graphene composites for electrocatalytic methanol oxidation." Physical Chemistry Chemical Physics 17, no. 39 (2015): 26101–10. http://dx.doi.org/10.1039/c5cp04141d.

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Pt particles (2–3 nm) deposited using a liquid–liquid interface reaction technique are used to construct LbL architectures to form MoS₂/graphene composites for efficient methanol oxidation.

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Chen, Long, Liangliang Huang, and Jiahua Zhu. "Stitching graphene oxide sheets into a membrane at a liquid/liquid interface." Chem. Commun. 50, no. 100 (October 21, 2014): 15944–47. http://dx.doi.org/10.1039/c4cc07558g.

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Allaire, Ryan H., Abhijeet Dhakane, Reece Emery, P. Ganesh, Philip D. Rack, Lou Kondic, Linda Cummings, and Miguel Fuentes-Cabrera. "Surface, Interface, and Temperature Effects on the Phase Separation and Nanoparticle Self Assembly of Bi-Metallic Ni0.5Ag0.5: A Molecular Dynamics Study." Nanomaterials 9, no. 7 (July 21, 2019): 1040. http://dx.doi.org/10.3390/nano9071040.

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Classical molecular dynamics (MD) simulations were used to investigate how free surfaces, as well as supporting substrates, affect phase separation in a NiAg alloy. Bulk samples, droplets, and droplets deposited on a graphene substrate were investigated at temperatures that spanned regions of interest in the bulk NiAg phase diagram, i.e., miscible and immiscible liquid, liquid-crystal, and crystal-crystal regions. Using MD simulations to cool down a bulk sample from 3000 K to 800 K, it was found that phase separation below 2400 K takes place in agreement with the phase diagram. When free surface effects were introduced, phase separation was accompanied by a core-shell transformation: spherical droplets created from the bulk samples became core-shell nanoparticles with a shell made mostly of Ag atoms and a core made of Ni atoms. When such droplets were deposited on a graphene substrate, the phase separation was accompanied by Ni layering at the graphene interface and Ag at the vacuum interface. Thus, it should be possible to create NiAg core-shell and layer-like nanostructures by quenching liquid NiAg samples on tailored substrates. Furthermore, interesting bimetallic nanoparticle morphologies might be tuned via control of the surface and interface energies and chemical instabilities of the system.

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Rodgers, Andrew N. J., and Robert A. W. Dryfe. "Oxygen Reduction at the Liquid-Liquid Interface: Bipolar Electrochemistry through Adsorbed Graphene Layers." ChemElectroChem 3, no. 3 (October 22, 2015): 472–79. http://dx.doi.org/10.1002/celc.201500343.

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Kolmakov, Andrei, Hongxuan Guo, Alexander Yulaev, Evgheni Strelcov, and Alexander Tselev. "Polarization of the Graphene-Liquid Electrolyte Interface Probed by SEM." Microscopy and Microanalysis 24, S1 (August 2018): 354–55. http://dx.doi.org/10.1017/s143192761800226x.

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12

Cingolani, Juan Santiago, Martin Deimel, Simone Köcher, Christoph Scheurer, Karsten Reuter, and Mie Andersen. "Interface between graphene and liquid Cu from molecular dynamics simulations." Journal of Chemical Physics 153, no. 7 (August 21, 2020): 074702. http://dx.doi.org/10.1063/5.0020126.

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Polishchuk, Yu, S. Dubinevych, V. Zinin, and E. Shembel. "Graphene-enhanced sulfur cathode with high interface stability in Li-S batteries." Journal of Physics: Conference Series 2382, no. 1 (November 1, 2022): 012005. http://dx.doi.org/10.1088/1742-6596/2382/1/012005.

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The physicochemical properties of graphene and graphene materials obtained by the method of controlled detonation gas synthesis are presented. The fundamental possibility of controlling the graphene and graphene materials physicochemical properties by changing the synthesis conditions is shown. Dynamics of changes in the impedance spectra of Li-S and Li-S-Li batteries with graphene in non-aqueous liquid electrolyte 0.7 M LiIm, 0.25 M LiNO3, DME:DOL (2:1) were studied. The results of electrochemical testing of experimental samples and prototypes of elements of the lithium-sulfur system by the methods of cyclic voltammetry and galvanostatic cycling are presented. The effect of interface stabilization was expressed in a decrease in impedance spectra, an increase in discharge capacity, and more stable long-term cycling with high parameters. The investigation showed a positive effect of graphene materials in the active mass of the multilayered S-based electrode with special design.

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Huang, Li-Jiao, Xue Tian, Jin-Tao Yi, Ru-Qin Yu, and Xia Chu. "A turn-on upconversion fluorescence resonance energy transfer biosensor for ultrasensitive endonuclease detection." Analytical Methods 7, no. 18 (2015): 7474–79. http://dx.doi.org/10.1039/c5ay01169h.

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A facile one-step approach is proposed to make hydrophilic and DNA-functionalized upconversion nanoparticles through ligand exchange at the liquid–liquid interface, and an ultrasensitive and selective biosensor was designed for assaying nuclease activity and inhibition, based on FRET from the DNA-functionalized UCNPs to graphene oxide.

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15

Liu, Yue E., Cheng En He, Ren Gui Peng, Wei Tang, and Ying Kui Yang. "Ionic Liquid Assisted Dispersion of Reduced Graphene Oxide in Epoxy Composites with Improved Mechanical Properties." Advanced Materials Research 738 (August 2013): 56–60. http://dx.doi.org/10.4028/www.scientific.net/amr.738.56.

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Graphene nanosheets were prepared by chemical reduction of the exfoliated graphite oxide using sodium borohydride (NaBH4). The graphene/epoxy composites were separately fabricated in the absence or presence of imidazolium-based ionic liquids, and their dynamic thermomechanical and tensile properties were studied. TEM examinations show that graphene sheets are well dispersed in the epoxy resin and have strong interface adhesion with the matrix due to the π-π and/or cation-π interactions between graphene and imidazolium ions. The composite fabricated by assistance of ionic liquids shows larger increases in Youngs modulus, tensile strength, storage modulus and glass transition temperature compared to the composite without using ionic liquids. This work provides a method for the fabrication of multifunctional graphene-based polymer composites.

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Trusova, Elena A., Klara V. Kotsareva, Alexey N. Kirichenko, Sergey S. Abramchuk, and Igor A. Perezhogin. "Sonochemical Preparation and Subsequent Fixation of Oxygen-Free Graphene Sheets at N,N-Dimethyloctylamine-Aqua Boundary." Advances in Materials Science and Engineering 2018 (2018): 1–11. http://dx.doi.org/10.1155/2018/6026437.

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In this study, the syntheses of oxygen-free graphene sheets and the method of its fixation at an oil-aqua interface were presented. The graphene sheets were prepared by exfoliation of synthetic graphite powder in an aqua-organic medium under ultrasound irradiation. N,N-Dimethyloctylamine- (DMOA-) aqua emulsion was used as the liquid medium, and pH was equal to 3. The obtained graphene nanosuspension was fractionated by sedimentation and decanted according to the weight. The graphene nanoparticle fractions, differing in configuration and number of layers, have been characterized using transmission electron microscopy (TEM), electron diffraction, HRTEM, Raman spectroscopy, and electron energy loss spectroscopy (EELS). It was found that using a DMOA-aqua mixture as the liquid medium in ultrasonic treatment of synthetic graphite leads to the formation of oxygen-free 1-2-layer graphene sheets attached to the DMOA-aqua interface. The proposed method differs from known ones by using a small amount of more environmentally friendly organic substances. It allows to obtain large quantities of oxygen-free graphene, and finally unconverted graphite can be directed for reuse. The proposed method allows to obtain both 2D graphene sheets with micron linear dimensions and 3D packages with a high content of defects. Both these species are in demand in areas related to the development of new materials with unique electrophysical properties.

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Cui, Xinghong, Yanfang Zhu, Fei Li, Daijun Liu, Jianjun Chen, Yuxin Zhang, Li Li Zhang, and Junyi Ji. "Enhanced rate capability of a lithium ion battery anode based on liquid–solid-solution assembly of Fe2O3 on crumpled graphene." RSC Advances 6, no. 11 (2016): 9007–12. http://dx.doi.org/10.1039/c5ra22408j.

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We report a liquid–solid-solution assemble strategy to fabricate Fe₂O₃@graphene (Fe₂O₃@rGO) composites at the oil/water interface. The composite with ultrathin Fe₂O₃ nanoplates anchored on crumpled graphene sheets can act as a high-rate LIBs anode.

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18

Thomas, Loji K., and Michael Reichling. "Capillary force-induced superlattice variation atop a nanometer-wide graphene flake and its moiré origin studied by STM." Beilstein Journal of Nanotechnology 10 (April 1, 2019): 804–10. http://dx.doi.org/10.3762/bjnano.10.80.

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We present strong experimental evidence for the moiré origin of superlattices on graphite by imaging a live transition from one superlattice to another with concurrent and direct measurement of the orientation angle before and after rotation using scanning tunneling microscopy (STM). This has been possible due to a fortuitous observation of a superlattice on a nanometer-sized graphene flake wherein we have induced a further rotation of the flake utilizing the capillary forces at play at a solid–liquid interface using STM tip motion. We propose a more “realistic” tip–surface meniscus relevant to STM at solid–liquid interfaces and show that the capillary force is sufficient to account for the total expenditure of energy involved in the process.

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19

Collins, Liam, Jason I. Kilpatrick, Ivan V. Vlassiouk, Alexander Tselev, Stefan A. L. Weber, Stephen Jesse, Sergei V. Kalinin, and Brian J. Rodriguez. "Dual harmonic Kelvin probe force microscopy at the graphene–liquid interface." Applied Physics Letters 104, no. 13 (March 31, 2014): 133103. http://dx.doi.org/10.1063/1.4870074.

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20

D'Urso, Luisa, Cristina Satriano, Giuseppe Forte, Giuseppe Compagnini, and Orazio Puglisi. "Water structure and charge transfer phenomena at the liquid–graphene interface." Physical Chemistry Chemical Physics 14, no. 42 (2012): 14605. http://dx.doi.org/10.1039/c2cp42249b.

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21

Patil, Sagar H., Aarti P. Gaikwad, Babasaheb J. Waghmode, Shivaram D. Sathaye, and Kashinath R. Patil. "A graphene–MnO2 composite supercapacitor material accomplished tactically using liquid–liquid and solid–liquid interface reaction techniques." New Journal of Chemistry 44, no. 17 (2020): 6853–61. http://dx.doi.org/10.1039/c9nj05898b.

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22

Méndez-Morales, Trinidad, Jesús Carrete, Martín Pérez-Rodríguez, Óscar Cabeza, Luis J. Gallego, Ruth M. Lynden-Bell, and Luis M. Varela. "Molecular dynamics simulations of the structure of the graphene–ionic liquid/alkali salt mixtures interface." Phys. Chem. Chem. Phys. 16, no. 26 (2014): 13271–78. http://dx.doi.org/10.1039/c4cp00918e.

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23

Gudarzi, Mohsen Moazzami, and Farhad Sharif. "Self assembly of graphene oxide at the liquid–liquid interface: A new route to the fabrication of graphene based composites." Soft Matter 7, no. 7 (2011): 3432. http://dx.doi.org/10.1039/c0sm01311k.

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24

Chen, Shiue-Luen, Chong-You Chen, Jason Chia-Hsun Hsieh, Zih-Yu Yu, Sheng-Jen Cheng, Kuan Yu Hsieh, Jia-Wei Yang, Priyank V. Kumar, Shien-Fong Lin, and Guan-Yu Chen. "Graphene Oxide-Based Biosensors for Liquid Biopsies in Cancer Diagnosis." Nanomaterials 9, no. 12 (December 3, 2019): 1725. http://dx.doi.org/10.3390/nano9121725.

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Liquid biopsies use blood or urine as test samples, which are able to be continuously collected in a non-invasive manner. The analysis of cancer-related biomarkers such as circulating tumor cells (CTCs), circulating tumor DNA (ctDNA), microRNA, and exosomes provides important information in early cancer diagnosis, tumor metastasis detection, and postoperative recurrence monitoring assist with clinical diagnosis. However, low concentrations of some tumor markers, such as CTCs, ctDNA, and microRNA, in the blood limit its applications in clinical detection and analysis. Nanomaterials based on graphene oxide have good physicochemical properties and are now widely used in biomedical detection technologies. These materials have properties including good hydrophilicity, mechanical flexibility, electrical conductivity, biocompatibility, and optical performance. Moreover, utilizing graphene oxide as a biosensor interface has effectively improved the sensitivity and specificity of biosensors for cancer detection. In this review, we discuss various cancer detection technologies regarding graphene oxide and discuss the prospects and challenges of this technology.

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Ge, Xiangyu, Zhiyuan Chai, Qiuyu Shi, Yanfei Liu, Jiawei Tang, and Wenzhong Wang. "Liquid Superlubricity Enabled by the Synergy Effect of Graphene Oxide and Lithium Salts." Materials 15, no. 10 (May 16, 2022): 3546. http://dx.doi.org/10.3390/ma15103546.

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In this study, graphene oxide (GO) nanoflakes and lithium salt (LiPF6) were utilized as lubrication additives in ether bond−containing dihydric alcohol aqueous solutions (DA(aq)) to improve lubrication performances. The apparent friction reduction and superlubricity were realized at the Si3N4/sapphire interface. The conditions and laws for superlubricity realization have been concluded. The underlying mechanism was the synergy effect of GO and LiPF6. It was proven that a GO adsorption layer was formed at the interface, which caused the shearing interface to transfer from solid asperities to GO interlayers (weak interlayer interactions), resulting in friction reduction and superlubricity realization. In addition to the GO adsorption layer, a boundary layer containing phosphates and fluorides was formed by tribochemical reactions of LiPF6 and was conducive to low friction. Additionally, a fluid layer contributed to friction reduction as well. This work proved that GO−family materials are promising for friction reduction, and provided new insights into realizing liquid superlubricity at macroscale by combining GO with other materials.

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Lv, Wei, Zhangxun Xia, Sida Wu, Ying Tao, Feng-Min Jin, Baohua Li, Hongda Du, Zhen-Ping Zhu, Quan-Hong Yang, and Feiyu Kang. "Conductive graphene-based macroscopic membrane self-assembled at a liquid–air interface." Journal of Materials Chemistry 21, no. 10 (2011): 3359. http://dx.doi.org/10.1039/c0jm02852e.

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27

Shao, Jiao-Jing, Wei Lv, Quangui Guo, Chen Zhang, Qiang Xu, Quan-Hong Yang, and Feiyu Kang. "Hybridization of graphene oxide and carbon nanotubes at the liquid/air interface." Chem. Commun. 48, no. 31 (2012): 3706–8. http://dx.doi.org/10.1039/c1cc16838j.

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Fedorov, Maxim V., and R. M. Lynden-Bell. "Probing the neutral graphene–ionic liquid interface: insights from molecular dynamics simulations." Physical Chemistry Chemical Physics 14, no. 8 (2012): 2552. http://dx.doi.org/10.1039/c2cp22730d.

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29

Gómez-González, V., A. García-Fuente, A. Vega, J. Carrete, O. Cabeza, L. J. Gallego, and L. M. Varela. "Density Functional Study of Charge Transfer at the Graphene/Ionic Liquid Interface." Journal of Physical Chemistry C 122, no. 27 (July 2, 2018): 15070–77. http://dx.doi.org/10.1021/acs.jpcc.8b02795.

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Zhang, Man, Jun Zhang, Zhenyao Ding, Haili Wang, Lihui Huang, and Xinjian Feng. "Laser-Induced Graphene Arrays-Based Three-Phase Interface Enzyme Electrode for Reliable Bioassays." Biomimetics 8, no. 1 (January 8, 2023): 26. http://dx.doi.org/10.3390/biomimetics8010026.

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Electrochemical oxidase biosensors have been widely applied in healthcare, environmental measurements and the biomedical field. However, the low and fluctuant oxygen levels in solution and the high anodic detection potentially restrict the assay accuracy. To address these problems, in this work, we constructed a three-phase interface enzyme electrode by sequentially immobilizing H2O2 electrocatalysts and an oxidase layer on a superhydrophobic laser-induced graphene (LIG) array substrate. The LIG-based enzyme electrode possesses a solid–liquid–air three-phase interface where constant and sufficient oxygen can be supplied from the air phase to the enzymatic reaction zone, which enhances and stabilizes the oxidase kinetics. We discovered that the enzymatic reaction rate is 21.2-fold improved over that of a solid–liquid diphase system where oxygen is supplied from the liquid phase, leading to a 60-times wider linear detection range. Moreover, the three-phase enzyme electrode can employ a cathodic measuring principle for oxidase catalytic product H2O2 detection, which could minimize interferences arising from oxidizable molecules in biofluids and increase the detection selectivity. This work provides a simple and promising approach to the design and construction of high-performance bioassay systems.

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Bramhaiah, Kommula, Vidya N. Singh, and Neena S. John. "Three Dimensional Branched Gold Nanostructures on Reduced Graphene Oxide Films Formed at a Liquid/Liquid Interface." Particle & Particle Systems Characterization 31, no. 11 (July 1, 2014): 1168–74. http://dx.doi.org/10.1002/ppsc.201400037.

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Diego, Michele, Marco Gandolfi, Stefano Giordano, Fabien Vialla, Aurélien Crut, Fabrice Vallée, Paolo Maioli, Natalia Del Fatti, and Francesco Banfi. "Tuning photoacoustics with nanotransducers via thermal boundary resistance and laser pulse duration." Applied Physics Letters 121, no. 25 (December 19, 2022): 252201. http://dx.doi.org/10.1063/5.0135147.

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The photoacoustic effect in liquids, generated by metal nanoparticles excited with short laser pulses, offers high contrast imaging and promising medical treatment techniques. Understanding the role of the thermal boundary resistance (TBR) and the laser pulse duration in the generation mechanism of acoustic waves is essential to implement efficient photoacoustic nanotransducers. This work theoretically investigates, for the paradigmatic case of water-immersed gold nanocylinders, the role of the TBR and laser pulse duration in the competition between the launching mechanisms: the thermophone and the mechanophone. In the thermophone, the nanoparticle acts as a nanoheater and the wave is launched by water thermal expansion. In the mechanophone, the nanoparticle directly acts as a nanopiston. Specifically, for a gold–water interface, the thermophone prevails under ns light pulse irradiation, while the mechanophone dominates shortening the pulse to the 10 ps regime. For a graphene-functionalized gold–water interface, instead, the mechanophone dominates over the entire range of explored laser pulse durations. The results point to high-TBR, liquid-immersed nanoparticles as potentially efficient photoacoustic nanogenerators, with the advantage of keeping the liquid environment temperature unaltered.

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Pervez, Syed Atif, Milad Madinehei, and Nima Moghimian. "Graphene in Solid-State Batteries: An Overview." Nanomaterials 12, no. 13 (July 5, 2022): 2310. http://dx.doi.org/10.3390/nano12132310.

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Solid-state batteries (SSBs) have emerged as a potential alternative to conventional Li-ion batteries (LIBs) since they are safer and offer higher energy density. Despite the hype, SSBs are yet to surpass their liquid counterparts in terms of electrochemical performance. This is mainly due to challenges at both the materials and cell integration levels. Various strategies have been devised to address the issue of SSBs. In this review, we have explored the role of graphene-based materials (GBM) in enhancing the electrochemical performance of SSBs. We have covered each individual component of an SSB (electrolyte, cathode, anode, and interface) and highlighted the approaches using GBMs to achieve stable and better performance. The recent literature shows that GBMs impart stability to SSBs by improving Li+ ion kinetics in the electrodes, electrolyte and at the interfaces. Furthermore, they improve the mechanical and thermal properties of the polymer and ceramic solid-state electrolytes (SSEs). Overall, the enhancements endowed by GBMs will address the challenges that are stunting the proliferation of SSBs.

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Velasco-Velez, Juan J., Verena Pfeifer, Michael Hävecker, Robert S. Weatherup, Rosa Arrigo, Cheng-Hao Chuang, Eugen Stotz, et al. "Photoelectron Spectroscopy at the Graphene-Liquid Interface Reveals the Electronic Structure of an Electrodeposited Cobalt/Graphene Electrocatalyst." Angewandte Chemie International Edition 54, no. 48 (October 14, 2015): 14554–58. http://dx.doi.org/10.1002/anie.201506044.

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Purwidyantri, Agnes, Telma Domingues, Jérôme Borme, Joana Rafaela Guerreiro, Andrey Ipatov, Catarina M. Abreu, Marco Martins, Pedro Alpuim, and Marta Prado. "Influence of the Electrolyte Salt Concentration on DNA Detection with Graphene Transistors." Biosensors 11, no. 1 (January 17, 2021): 24. http://dx.doi.org/10.3390/bios11010024.

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Liquid-gated Graphene Field-Effect Transistors (GFET) are ultrasensitive bio-detection platforms carrying out the graphene’s exceptional intrinsic functionalities. Buffer and dilution factor are prevalent strategies towards the optimum performance of the GFETs. However, beyond the Debye length (λD), the role of the graphene-electrolytes’ ionic species interactions on the DNA behavior at the nanoscale interface is complicated. We studied the characteristics of the GFETs under different ionic strength, pH, and electrolyte type, e.g., phosphate buffer (PB), and phosphate buffer saline (PBS), in an automatic portable built-in system. The electrostatic gating and charge transfer phenomena were inferred from the field-effect measurements of the Dirac point position in single-layer graphene (SLG) transistors transfer curves. Results denote that λD is not the main factor governing the effective nanoscale screening environment. We observed that the longer λD was not the determining characteristic for sensitivity increment and limit of detection (LoD) as demonstrated by different types and ionic strengths of measuring buffers. In the DNA hybridization study, our findings show the role of the additional salts present in PBS, as compared to PB, in increasing graphene electron mobility, electrostatic shielding, intermolecular forces and DNA adsorption kinetics leading to an improved sensitivity.

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Kondo, Hiroki, Takayoshi Tsutsumi, Kenji Ishikawa, Makoto Sekine, and Masaru Hori. "(Invited) Synthesis, Functionalization, and Three-Dimensional Structuring of Carbon Nanomaterials By Gas-Liquid Interface Plasma." ECS Meeting Abstracts MA2022-02, no. 18 (October 9, 2022): 870. http://dx.doi.org/10.1149/ma2022-0218870mtgabs.

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Carbon nanomaterials, such as fullerene, carbon nanotubes (CNT), graphene sheets, and so forth, play indispensable roles in nanotechnology research and applications. Due to their unique self-organized nanostructures and properties, various types of applications using them are expected and have been developed. One of recent hottest topics among them is graphene sheets and their electric device applications. High quality graphene sheets for such the device applications, epitaxial growth or chemical vapor deposition (CVD) methods at high temperature up to 1,000°C, are used as a synthesis method in general. On the other hand, some kinds of applications, such as sensors, batteries, additives to polymers, and so forth, need a large amount of nanographene power. For that purpose, a reduction of graphene oxide (GO) is well known, but the quality of the synthesized graphene is not high enough. Recently, we have established a high-speed synthesis method of nanographene materials with high crystallinity by a plasma discharge at gas-liquid interfaces with alcohol sources. By this method, a synthesis rate of nanographene over 1 mg/min and higher crystallinity of nanographene than the reduced GO have been realized. On the other hand, there is a trade-of relationship between the synthesis rate and crystallinity, when different types of alcohols were used as a feed stock gas. When ethanol,1-propanol, and 1-butanol were used, it was found that the higher synthesis rates were obtained by the higher-molecular weight alcohols, while its crystallinity was lower. In the comparison between hexane (C6H14) and hexanol (C6H13OH), in the case of hexane, the synthesis rate is about twice as high as that in the case of hexanol, but the crystallinity is lowered. These results indicate that this trade-of relationship is attributed to a ratio of carbon (C) and oxygen (O) atoms. O-related radicals (O, OH, etc.) in plasma could have etching effects of amorphous or low-crystallinity carbon components. Actually, according to the results of plasma diagnostic measurements and residual liquid analyses, it was found that crystallinity of nanographene materials degraded with decrease in OH intensity in plasma. Furthermore, small radicals such as C2 and CHx contribute to the synthesis of nanographene rather than by-products with a six-membered ring structure. Furthermore, we have also found functionalization and structural control of nanographene materials by additive agents to alcohol sources at in-liquid plasma processes. Using an iron phthalocyanine with ethanol, size of carbon nanosheets increased up to micrometer. And they showed excellent catalytic characteristics thorough 4-electron reduction pathway. According to the verification results of dependence on synthesis conditions such as the type of additive, such the catalytic activity is induced by pyridinic C-N bonds. In the case of this way, to increase pyridinic C-N bonds and improve catalytic performance, iron phthalocyanine is much better than Hemin, even which also included Fe and N. These knowledges obtained in this study will open the way to the next-generation green energy solutions, such as high-performance catalytic electrode for the fuel cell.

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37

Li, Kun, Jing Jie Sha, Lei Liu, Gen Sheng Wu, Wei Si, and Yun Fei Chen. "Molecular Dynamics Study of Confined Fluid in Graphene Nanopores." Advanced Materials Research 1061-1062 (December 2014): 205–8. http://dx.doi.org/10.4028/www.scientific.net/amr.1061-1062.205.

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With the miniaturization of the NEMS/MEMS, the size effect becomes significant in the nanochannels/nanopores through which fluid flows as well as the interface effect. By all-atom molecular dynamics (MD) simulations, the ion transportation is investigated in nanopores as well as the physical properties at solid-liquid interface. To describe the anion and cation distributions of NaCl solution in vicinity of graphene nanopores, a new MD model was developed, taking thermal vibration of wall atoms, the structure of solvent molecules and ion sizes into consideration. The main peak locations of ion distributions stayed unchanged by changing the nanopore size, the solution concentration and the electric field strength. The ionic currents increased linearly with the diameter and the electric field strength, while it increased non-linearly with the solution concentration.

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38

Kang, Sumin, Taeshik Yoon, Boo Soo Ma, Min Sun Cho, and Taek-Soo Kim. "Liquid-assisted adhesion control of graphene–copper interface for damage-free mechanical transfer." Applied Surface Science 551 (June 2021): 149229. http://dx.doi.org/10.1016/j.apsusc.2021.149229.

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39

Lu, Pengfei, Qiaobo Dai, Liangyu Wu, and Xiangdong Liu. "Structure and Capacitance of Electrical Double Layers at the Graphene–Ionic Liquid Interface." Applied Sciences 7, no. 9 (September 12, 2017): 939. http://dx.doi.org/10.3390/app7090939.

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40

Wang, Zhuo, Xuesong Yang, and Maggie Yihong Chen. "Assembly of Patterned Graphene Film Aided by Wetting/Nonwetting Surface on Liquid Interface." IEEE Transactions on Nanotechnology 13, no. 3 (May 2014): 589–93. http://dx.doi.org/10.1109/tnano.2014.2312951.

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41

Uysal, Ahmet, Hua Zhou, Guang Feng, Sang Soo Lee, Song Li, Paul Fenter, Peter T. Cummings, et al. "Structural Origins of Potential Dependent Hysteresis at the Electrified Graphene/Ionic Liquid Interface." Journal of Physical Chemistry C 118, no. 1 (December 19, 2013): 569–74. http://dx.doi.org/10.1021/jp4111025.

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42

Kim, Hyeri, Young Rae Jang, Jeseung Yoo, Young-Soo Seo, Ki-Yeon Kim, Jeong-Soo Lee, Soon-Dong Park, Chan-Joong Kim, and Jaseung Koo. "Morphology Control of Surfactant-Assisted Graphene Oxide Films at the Liquid–Gas Interface." Langmuir 30, no. 8 (February 19, 2014): 2170–77. http://dx.doi.org/10.1021/la403255q.

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43

Cheong, Jun Young, Joon Ha Chang, Sung Joo Kim, Chanhoon Kim, Hyeon Kook Seo, Jae Won Shin, Jong Min Yuk, Jeong Yong Lee, and Il-Doo Kim. "In Situ High-Resolution Transmission Electron Microscopy (TEM) Observation of Sn Nanoparticles on SnO2 Nanotubes Under Lithiation." Microscopy and Microanalysis 23, no. 6 (December 2017): 1107–15. http://dx.doi.org/10.1017/s1431927617012739.

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AbstractWe trace Sn nanoparticles (NPs) produced from SnO2 nanotubes (NTs) during lithiation initialized by high energy e-beam irradiation. The growth dynamics of Sn NPs is visualized in liquid electrolytes by graphene liquid cell transmission electron microscopy. The observation reveals that Sn NPs grow on the surface of SnO2 NTs via coalescence and the final shape of agglomerated NPs is governed by surface energy of the Sn NPs and the interfacial energy between Sn NPs and SnO2 NTs. Our result will likely benefit more rational material design of the ideal interface for facile ion insertion.

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44

Siddaiah, Arpith, Pankaj Kumar, Artie Henderson, Manoranjan Misra, and Pradeep L. Menezes. "Surface Energy and Tribology of Electrodeposited Ni and Ni–Graphene Coatings on Steel." Lubricants 7, no. 10 (October 9, 2019): 87. http://dx.doi.org/10.3390/lubricants7100087.

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Composite electrochemical coatings (CECs) are some of the most widely investigated coatings due to its versatility in tailoring physio-mechanical and tribological properties. The effectiveness of the CECs for tribological applications is dependent on the solid–liquid interfaces. The active and passive nature of the contact boundaries for a CEC with a solid/liquid interface is defined by the surface energy of these boundaries. Unless the effect of surface energy on the tribological properties of the CEC are understood, it is not possible to get a holistic picture on properties, such as corrosion and tribocorrosion. The present study investigates the surface energy of optimized nickel (Ni) and Ni–graphene (Ni–Gr) coatings and their effect on the dynamic friction and wear behavior. It was found that the addition of Gr to the Ni coating in small quantities could decrease the polar component of surface energy significantly than the dispersive component. The presence of Gr in the coating was able to reduce the wear while providing low friction. The Ni–Gr coating exhibited low surface energy that includes weak adhesive forces, which can prevent embedding of the wear particles during sliding.

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45

Cotet, Liviu Cosmin, Klára Magyari, Milica Todea, Mircea Cristian Dudescu, Virginia Danciu, and Lucian Baia. "Versatile self-assembled graphene oxide membranes obtained under ambient conditions by using a water–ethanol suspension." Journal of Materials Chemistry A 5, no. 5 (2017): 2132–42. http://dx.doi.org/10.1039/c6ta08898h.

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The study reports a low cost and scalable pathway for preparing free-standing GO membranes by a self-assembly process under ambient conditions at an air–liquid interface of an isopycnic sorted GO water–ethanol fraction.

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46

Butko A.V., Butko V.Y., and Kumzerov Y.A. "Optimization of graphene transistor sensors based on quantum capacitance and charge carrier mobility analysis." Physics of the Solid State 64, no. 12 (2022): 2041. http://dx.doi.org/10.21883/pss.2022.12.54405.441.

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Charge density of molecules (Nm) in hybrid nanostructures that is formed at the interface of graphene and liquid in solution gated graphene field effect transistors (SGFETs) determines the selective response of chemical and biological sensors based on these SGFETs. For optimization of this response it is important to determine how it depends on characteristics of SGFETs such as quantum capacitance (Cq) and charge mobility (μ) which are functionally linked to Nm. The proposed model shows that when the gate voltage (Vgate) is near the minimum point of graphene conductivity (Dirac point) the sensor response is low and increases with gate voltage until Cq is approximately equal to the capacitance of the formed double layer (Cdl) in SGFETs. A decrease in sensor response is predicted upon further increase of Vgate in cases where there is a stronger dependence of μ on Nm than μ propto 1/Nm. A comparison of the predicted results of the model and literature data obtained in SGFET sensors for lysine in an aqueous solution are in agreement with the assumption that the optimal condition of Cq~ Cdl is reached approximately in the Vgate region of (0.5-1.4) V from the Dirac Point. Keywords: graphene, hybrid nanostructures, transistor sensor, charge mobility, interface.

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Kim, Hyeri, Jongsoon Kim, Hee-Sung Jeong, Hyungsub Kim, Hoyeon Lee, Jae-Min Ha, Sung-Min Choi, et al. "Spontaneous hybrids of graphene and carbon nanotube arrays at the liquid–gas interface for Li-ion battery anodes." Chemical Communications 54, no. 41 (2018): 5229–32. http://dx.doi.org/10.1039/c8cc02148a.

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48

Kavitha, C., K. Bramhaiah, Neena S. John, and Shantanu Aggarwal. "Improved surface-enhanced Raman and catalytic activities of reduced graphene oxide–osmium hybrid nano thin films." Royal Society Open Science 4, no. 9 (September 2017): 170353. http://dx.doi.org/10.1098/rsos.170353.

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Reduced graphene oxide–osmium (rGO-Os) hybrid nano dendtrites have been prepared by simple liquid/liquid interface method for the first time. The method involves the introduction of phase-transfered metal organic precursor in toluene phase and GO dispersion in the aqueous phase along with hydrazine hydrate as the reducing agent. Dendritic networks of Os nanoparticles and their aggregates decorating rGO layers are obtained. The substrate shows improved catalytic and surface-enhanced activities comparable with previous reports. The catalytic activity was tested for the reduction of p -nitroaniline into p -phenyldiamine with an excess amount of NaBH 4 . The catalytic activity factors of these hybrid films are 2.3 s −1 g −1 (Os film) and 4.4 s −1 g −1 (rGO-Os hybrid film), which are comparable with other noble metal nanoparticles such as Au, Ag, but lower than Pd-based catalysts. Surface-enhanced Raman spectroscopy (SERS) measurements have been done on rhodamine 6G (R6G) and methylene blue dyes. The enhancement factor for the R6G adsorbed on rGO-Os thin film is 1.0 × 10 5 and for Os thin film is 7 × 10 3 . There is a 14-fold enhancement observed for Os hybrids with rGO. The enhanced catalytic and SERS activities of rGO-Os hybrid thin film prepared by simple liquid/liquid interface method open up new challenges in electrocatalytic application and SERS-based detection of biomolecules.

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49

Loulijat, Hamid. "Numerical study of the formation of liquid layer at the liquid–solid interface near the graphene in nanofluid." Materials Today: Proceedings 50 (2022): 2143–51. http://dx.doi.org/10.1016/j.matpr.2021.09.439.

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50

Biswas, Sanjib, and Lawrence T. Drzal. "A Novel Approach to Create a Highly Ordered Monolayer Film of Graphene Nanosheets at the Liquid−Liquid Interface." Nano Letters 9, no. 1 (January 14, 2009): 167–72. http://dx.doi.org/10.1021/nl802724f.

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Journal articles on the topic 'Graphene liquid interface'

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