Graphene oxide

/Tag: Graphene oxide

Antibody-modified reduced graphene oxide film for circulating tumor cell detection in early-stage prostate cancer patients

2019-03-22T16:34:27+00:00March 22nd, 2019|Categories: Publications|Tags: , |

RSC Adv., 2019, 9,9379-9385DOI: 10.1039/C8RA08682F, Paper Open Access &nbsp This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.Binshuai Wang, Yimeng Song, Liyuan Ge, Shudong Zhang, Lulin MaWe report the fabrication of an antibody-modified reduced graphene oxide film, which can be

Published in: "RSC Advances".

Metal to insulator transition in Conducting Polyaniline/Graphene Oxide composites. (arXiv:1903.07954v1 [cond-mat.mtrl-sci])

2019-03-20T02:29:31+00:00March 20th, 2019|Categories: Publications|Tags: , |

Broadband Dielectric Spectroscopy (BDS) measurements of P{omicron}lyaniline/Graphene oxide composites were conducted for an as-prepared and a thermally annealed specimen, respectively, from 15K to room temperature. Electrical conductivity values of the annealed composite display a very modest rise denoting the important contributions of the GO component to achieving electrical stability of the polymer. Patterns of the dc conductivity as a function of temperature also reveal a metal to insulator transition around 75K. The transition is dominated by two key factors; temperature and annealing process. Metal-like and insulating features are subsequently detected, as well, and accordingly described to provide a qualitative inspection of the charge transfer mechanisms involved

Published in: "arXiv Material Science".

Electric-field-induced emergent electrical connectivity in graphene oxide

2019-03-19T12:35:22+00:00March 19th, 2019|Categories: Publications|Tags: , |

Author(s): M. Neek-Amal, R. Rashidi, Rahul R. Nair, D. Neilson, and F. M. PeetersUnderstanding the appearance of local electrical connectivity in liquid filled layered graphene oxide subjected to an external electric field is important to design electrically controlled smart permeable devices and also to gain insight into the physics behind electrical effects on confined water p…[Phys. Rev. B 99, 115425] Published Tue Mar 19, 2019

Published in: "Physical Review B".

Platinum Nanoparticles Decorated Graphene Oxide Based Resistive Device for Enhanced Formaldehyde Sensing: First-Principle Study and its Experimental Correlation

2019-03-19T00:32:54+00:00March 18th, 2019|Categories: Publications|Tags: , , |

This paper reports the formaldehyde (HCHO) sensing mechanism of platinum nanoparticles (Pt) supported reduced graphene oxide (RGO)-based resistive sensor devices through the experimental investigation and subsequent density functional theory (DFT) computation. Sensing measurements conducted at room temperature revealed that the Pt facilitated enhanced charge transfer between HCHO molecule and RGO-Pt nanomaterial improves the response of the device by almost 4.5 times against 400 ppm of HCHO concentration as compared to bare RGO counterpart. The device has been found to recover within 350 s for an optimized impulsive heating treatment at 50 °C for 55 s. Moreover, the selectivity test performed for some common indoor volatile organic compounds signifies the RGO-Pt nanohybrid to be more specific toward the HCHO molecule. DFT-based first-principle calculations have also been carried out in terms of stable adsorption geometry, adsorption energy, net electron transfer, charge density difference, and changes in density of states of the HCHO adsorbed complexes. The simulation results suggest that the chemisorption of HCHO through molecular dissociation and strong covalent bond formation on RGO-Pt surface have led to significant changes in its resistivity in contrast to RGO, where HCHO molecule possesses pure physisorption. The simulation results agree quite well with the experimental observations.

Published in: "IEEE Transactions on Electron Devices".

Improving the Properties of L-Ascorbic Acid Biosensor Based on GO/IGZO/Al Using Magnetic Beads

2019-03-19T00:32:47+00:00March 18th, 2019|Categories: Publications|Tags: , |

An L-ascorbic acid (L-AA) biosensor based on an indium–gallium–zinc oxide (IGZO)/aluminum (Al) membrane modified by graphene oxide (GO) and magnetic beads (MBs) was produced and trusted to investigate its potential biosensor applications. An atomic force microscope, scanning electron microscope (SEM), and electrochemical impedance spectroscopy (EIS) were used to analyze electron transfer resistance (${R} _{textsf {et}}$ ), surface roughness, and surface morphology. The experimental results show that the L-AA biosensor possessed the average sensitivity of 78.9 mV/decade with a linearity of 0.997. The experimental results from the EIS confirm that ${R} _{textsf {et}}$ can be improved by the addition of GO and MBs. This paper opens a new window for the detection of L-AA based on MBs-ascorbate oxidase/GO/IGZO/Al sensing membranes.

Published in: "IEEE Transactions on Electron Devices".

NO 2 gas sensing performance enhancement based on reduced graphene oxide decorated V 2 O 5 thin films

2019-03-18T14:33:05+00:00March 18th, 2019|Categories: Publications|Tags: , |

Here, we demonstrate improved NO 2 gas sensing properties based on reduced graphene oxide (rGO) decorated V 2 O 5 thin film. Excluding the DC sputtering grown V 2 O 5 thin film, rGO was spread over V 2 O 5 thin film by the drop cast method. The formation of several p–n heterojunctions was greatly affected by the current–voltage relation of the rGO-decorated V 2 O 5 thin film due to the p-type and n-type nature of rGO and V 2 O 5 , respectively. Initially with rGO decoration on V 2 O 5 thin film, current decreased in comparison to the pristine V 2 O 5 thin film, whereas depositing rGO film on a glass substrate drastically increased current. Among all sensors, only the rGO-decorated V 2 O 5 sensor revealed a maximum NO 2 gas sensing response for 100 ppm at 150 °C, and it achieved an approximately 61% higher respo…

Published in: "Nanotechnology".

Inkjet-Printed Reduced Graphene Oxide (rGO) Films For Electrocatalytic Applications

2019-03-15T16:31:31+00:00March 15th, 2019|Categories: Publications|Tags: , |

Reduced graphene oxide (rGO) films for application as electrocatalyst have been deposited using an inkjet materials printer, with excellent control over the film morphology and properties. The dispersions were prepared by the ultrasound-assisted liquid exfoliation method using polyvinylpyrrolidone (PVP) as stabilizer. The environmentally friendly ink formulation exhibits a stability for at least 6 months. The inkjet-printed rGO/PVP composite films were thermally treated at different temperatures, and it was found that the fraction of remaining PVP considerably affects the final structural, textural, optical and electrocatalytic characteristics. After annealing at 400°C, the rGO film exhibits a morphology of interconnected flakes and a very good transparency with a transmittance >90% in the entire visible spectrum. The inkjet-printed rGO films have been applied as electrocatalytic coating on fluorine-doped tin oxide (FTO) and tested for activity for the reduction of Co(bpy)33+ in acetonitrile. Dye-sensitized solar cells (DSSCs) fabricated with an rGO film on FTO annealed at 400°C as counter-electrode achieved 87% of the efficiency with respect to DSSCs with a Pt-catalyzed counter electrode. Hence, the fabrication of active and inexpensive rGO films using a high-throughput technique such as inkjet printing is an interesting approach to accelerate the development of competitive electrocatalytic nanomaterials.

Published in: "Journal of the Electrochemical Society".

Neodymium-decorated graphene oxide as a corrosion barrier layer on Ti6Al4V alloy in acidic medium

2019-03-14T16:32:15+00:00March 14th, 2019|Categories: Publications|Tags: , |

RSC Adv., 2019, 9,8537-8545DOI: 10.1039/C9RA00106A, Paper Open Access &nbsp This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.N. Palaniappan, I. S. Cole, F. Caballero-Briones, S. Manickam, C. Lal, J. SathiskumarNeodymium-decorated graphene oxide is chemisorbed by non-bonding electrons on Ti6Al4V surface

Published in: "RSC Advances".

Intricate modulation of interlayer coupling at the graphene oxide/$mathrm{MoS}{mathrm{e}}_{2}$ interface: Application in time-dependent optics and device transport

2019-03-14T14:35:18+00:00March 14th, 2019|Categories: Publications|Tags: , , , |

Author(s): Tuhin Kumar Maji, Kumar Vaibhav, Samir Kumar Pal, Kausik Majumdar, K. V. Adarsh, and Debjani KarmakarIn the GO/MoSe2 semiconductor heterostructure, we have demonstrated a subtle control on the doping dynamics by modulating interlayer coupling through the combination of strain-reducing relative rotation of the constituting layers and variation of ligand type and concentration. By first-principles ca…[Phys. Rev. B 99, 115309] Published Tue Mar 12, 2019

Published in: "Physical Review B".

Electrochemically-derived graphene oxide membrane with high stability and superior ionic sieving

2019-03-14T12:32:59+00:00March 14th, 2019|Categories: Publications|Tags: , |

Chem. Commun., 2019, Accepted ManuscriptDOI: 10.1039/C8CC09970G, CommunicationDan Li, Pei Yu, Zhiyuan Xiong, Hualin Zhan, Ke Xie, Yu Lin Zhong, George Philitp SimonCrosslinker-free electrochemically-derived graphene oxide membranes are found to be extraordinarily stable in aqueous solutions and exhibit superior ionic sieving performance because of their unique chemical structure.The content of this RSS Feed (c) The Royal Society of Chemistry

Published in: "Chemical Communications".

Novel in situ synthesis of copper nanoparticles supported on reduced graphene oxide and its application as a new catalyst for the decomposition of composite solid propellants

2019-03-13T16:32:47+00:00March 13th, 2019|Categories: Publications|Tags: , |

RSC Adv., 2019, 9,8480-8489DOI: 10.1039/C9RA00789J, Paper Open Access &nbsp This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.Paulina L. Ríos, Paula Povea, Christopher Cerda-Cavieres, Juan L. Arroyo, Cesar Morales-Verdejo, Gabriel Abarca, María B. CamaradaThe synergistic effect of a copper and

Published in: "RSC Advances".

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