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Coated reduced graphene Oxide

Aida Mohammadi, Danielle Lilly Nicholls, Aristides Docoslis
This study examines the improvements in surface-enhanced Raman scattering (SERS) performance achieved when silver nanodendritic structures are coated with various graphene-based materials, namely graphene oxide (GO), reduced graphene oxide (rGO), and graphene nanoplatelets (GNPs). The tests are performed on our unique SERS-active substrates, prepared on the surface of planar microelectrode chips using an electric field-guided Ag nanoparticle assembly process. The graphene-based materials are introduced into the substrate by means of an in-house spray-coating technique...
October 11, 2018: Sensors
Huiru Zhao, Chengdong Zhang, Yaqi Wang, Wei Chen, Pedro J J Alvarez
Microbial reduction of graphene oxide (GO) under aerobic conditions is poorly understood despite its critical role in changing GO toxicity and environmental fate. Here we show that 20 mg/L GO interacts with the membrane-bound cytochrome c of E. coli in saline, shuttling electrons from the respiratory chain to extracellular molecular oxygen. This results in the formation of superoxide anions (O2●-), which in turn reduce GO in 30 min. The critical role of superoxide was demonstrated by impeding GO reduction upon addition of superoxide dismutase, or by carrying out experiments under strictly anaerobic conditions that preclude O2●- formation...
October 2, 2018: Environmental Science & Technology
Zhengyao Jiang, Hailong Jin, Shu Sun, Changqing Chen, Jie Zhang, Zefeng Guo, Xiaoyou Liu
The combination of biologically active compounds and nanomaterials in biomedicine field is growing rapidly and provided excellent forecasts for the progress of facile non-invasive approaches for the diagnosis of cancer therapy. In this present study, we demonstrated that as-prepared gallic acid (GA) coated reduced graphene oxide (rGO) combined with radiofrequency (RF) ablation has facilitated for the treatment of human renal epithelial cancer (A-489) cells without disturbing the renal proximal epithelial (HK-2) cells...
December 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
Vikram Hastak, Suresh Bandi, Sanjay Kashyap, Shilpi Singh, Suaib Luqman, Mangesh Lodhe, D R Peshwe, Ajeet K Srivastav
The antioxidant potential of superparamagnetic iron oxide nanoparticles functionalized with chitosan and graphene were examined in the present work. Coprecipitation technique was followed for the synthesis of iron oxide nanoparticles. Graphene-iron oxide nanocomposites were synthesized by mechanical mixing followed by the heat treatment at moderate temperature. The chitosan coated iron oxide nanoparticles were prepared by dispersing nanoparticles in chitosan solution. The nanoparticles/nanocomposites were characterized using XRD, SEM, TEM and HAADF-STEM for phase structure, morphology and elemental analysis...
September 29, 2018: Journal of Materials Science. Materials in Medicine
Xia Huang, Bin Luo, Ruth Knibbe, Han Hu, Miaoqiang Lyu, Mu Xiao, Dan Sun, Songcan Wang, Lianzhou Wang
To fulfil the potential of Li-S batteries (LSBs) with high energy density and low cost, multiple challenges need to be addressed simultaneously. Most research in LSBs have been focusing on sulfur cathode design, while the performance are also known to be sensitive to other parameters such as binder, current collector, separator, lithium anode, and electrolyte. Here, an integrated LSB system based on the understanding of the different roles of binder, current collector, and separator is developed. By using the cross-linked carboxymethyl cellulose-citric acid (CMC-CA) binder, Toray carbon paper current collector, and reduced graphene oxide (rGO) coated separator, LSBs achieve a high capacity of 960 mAh g-1 after 200 cycles (2...
September 28, 2018: Chemistry: a European Journal
Ya-Fei Fu, Yuan-Qing Li, Ya-Feng Liu, Pei Huang, Ning Hu, Shao-Yun Fu
Recently, various piezoresistive composites with good flexibility have been developed as sensing materials for flexible strain sensors (FSSs). External forces will be applied to strain sensors when they are used in some circumstances such as wrist bending, etc. However, conventional flexible composites may fail upon being subjected to external forces since they have low strength and are unable to protect the inner vulnerable structure of flexible sensors. In this work, the reduced graphene oxide-coated glass fabric (RGO@GF)/silicone composite is fabricated and used to make high-performance structural flexible strain sensors...
October 5, 2018: ACS Applied Materials & Interfaces
Sanjairaj Vijayavenkataraman, Siti Thaharah, Shuo Zhang, Wen Feng Lu, Jerry Ying Hsi Fuh
The incidence of peripheral nerve injuries is on the rise and the current gold standard for treatment of such injuries is nerve autografting. Given the severe limitations of nerve autografts which include donor site morbidity and limited supply, Neural Guide Conduits (NGCs) are considered as an effective alternative treatment. Conductivity is a desired property of an ideal NGC. Reduced graphene oxide (rGO) possesses several advantages in addition to its conductive nature such as the high surface area to volume ratio due to its nanostructure and has been explored for use in tissue engineering...
September 19, 2018: Artificial Organs
Huaibin Qing, Guorui Jin, Guoxu Zhao, Guoyou Huang, Yufei Ma, Xiaohui Zhang, Baoyong Sha, Zhengtang Luo, Tian Jian Lu, Feng Xu
Stem cell therapy is promising for treating traumatic injuries of the central nervous system, where a major challenge is to effectively differentiate neural stem cells into neurons with uniaxial alignment. Recently, controlling stem cell fate by modulating biophysical cues (e.g., stiffness, conductivity, and patterns) has emerged as an attractive approach. Herein, we report a new heterostructure composite scaffold to induce cell-oriented growth and enhance the neuronal differentiation of SH-SY5Y cells. The scaffold is composed of aligned electrospinning silk nanofibers coated on reduced graphene paper with high conductivity and good biocompatibility...
October 3, 2018: ACS Applied Materials & Interfaces
Jin Wang, Jingpeng Li, Xiaowei Zhuang, Xin Pan, Haixia Yu, Fangli Sun, Jiangang Song, Chunde Jin, Yingti Jiang
Bamboo is susceptible to mould and attack by fungi because of its high content of starch and sugar. To make bamboo-based outdoor materials, a new type of bamboo timber with improved mould resistance and antibacterial activity, coated with reduced graphene oxide and nanocrystal ZnO (abbreviated as RGO@ZnOBT), was fabricated by a two-step dip-dry and hydrothermal process. A possible synthesis mechanism for RGO@ZnOBT was investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscope, energy-dispersal X-ray analysis, X-ray photoelectron spectroscopy and Fourier-transform infrared spectroscopy...
August 2018: Royal Society Open Science
Sílvia V F Castro, Murilo N T Silva, Thiago F Tormin, Mário H P Santana, Edson Nossol, Eduardo M Richter, Rodrigo A A Munoz
This work presents the highly-sensitive detection of 2,4,6-trinitrotoluene (TNT) on reduced graphene oxide/multi-walled carbon nanotube (rGO/MWCNT) nanocomposite sensor. The formation of a thin film of this nanocomposite occurred at the cyclohexane/water immiscible interface of a mixture of MWCNT and rGO in the biphasic solution. The film was transferred to a boron-doped diamond (BDD) electrode for the square-wave voltammetric detection of TNT, which presented improved analytical characteristics in comparison with bare BDD and after modification with precursors...
December 4, 2018: Analytica Chimica Acta
Qiuyan Hao, Guoliang Cui, Yuan Tian, Taizhe Tan, Yongguang Zhang
In this paper, the synthesis of the three-dimensional (3D) composite of spherical reduced graphene oxide (RGO) with uniformly distributed CeO₂ particles is reported. This synthesis is done via a facile and large-scalable spray-drying process, and the CeO₂/RGO materials are hydrothermally compounded with sulfur. The morphology, composition, structure, and electrochemical properties of the 3D S/CeO₂/RGO composite are studied using X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), thermal gravimetric analysis (TGA), Raman spectra and X-ray photoelectron spectroscopy (XPS), etc...
September 14, 2018: Materials
Jingyu Qin, Jing Shen, Xiangyang Xu, Yuan Yuan, Guangyu He, Haiqun Chen
A composite was prepared at room temperature from nitrogen-doped reduced graphene oxide (N-rGO) and melamine via π-interaction. An ultra-sensitive electrochemical sensor for the determination of trace levels of bisphenol A (BPA) was obtained by coating a glassy carbon electrode (GCE) with the composite. The structure and morphology of composite were characterized by FTIR, Raman, XRD, XPS, SEM and TEM. Because of the synergetic effects of N-rGO and melamine, the modified GCE displays considerably enhanced sensitivity to BPA...
September 15, 2018: Mikrochimica Acta
Yongchao Yu, Pooran C Joshi, Jayne Wu, Anming Hu
We report a flexible sensor array electronic tongue system that is fabricated on a polymer substrate by the laser direct writing process for multiflavor detection. Electronic tongue is a sensing system that is applied to detect different elements with the same sensor array. By analyzing responses from different measurement units, it enables a cross-sensitivity, namely, the ability of the system to responding to a range of different analytes in solution without specific functionalization of sensors. In this article, a six-unit sensing array system was fabricated by a laser direct writing process...
September 27, 2018: ACS Applied Materials & Interfaces
Weiwei Li, Changjiu Teng, Yilin Sun, Li Cai, Jian-Long Xu, Mengxing Sun, Xian Li, Xiaokuo Yang, Lan Xiang, Dan Xie, Tianling Ren
Flexible chemical sensors usually require transfer of prepared layers or whole device onto special flexible substrates and further attachment to target objects, limiting the practical applications. Herein, a sprayed gas sensor array utilizing silver nanoparticles (AgNPs)-all-carbon hybrid nanostructures is introduced to enable direct device preparation on various target objects. The fully flexible device is formed using metallic single-walled carbon nanotubes as conductive electrodes and AgNPs-decorated reduced graphene oxide as sensing layers...
October 10, 2018: ACS Applied Materials & Interfaces
Fanjun Zhu, Guangying Zhao, Wenchao Dou
A highly sensitive electrochemical sandwich immunoassay is described for determination of Escherichia coli O157:H7 (E. coli O157:H7). Silica coated magnetite nanoparticles (Fe3 O4 ) were modified with primary antibody to capture E. coli O157:H7. Gold-platinum core/shell nanoparticles (Au@Pt NPs) with different Pt shell thicknesses were prepared via changing the molar ratio of H2 PtCl6 to HAuCl4 in the precursor solution. The optimized Au@Pt NPs exhibit enhanced activity in the electrocatalytic reduction of hydrogen peroxide (H2 O2 )...
September 13, 2018: Mikrochimica Acta
Guantao Wang, Yong Wang, Yun Luo, Sida Luo
Carbon nanomaterials have gradually demonstrated their superiority for in-line process monitoring of high-performance composites. To explore the advantages of structures, properties, as well as sensing mechanisms, three types of carbon nanomaterials-based fiber sensors, namely, carbon nanotube-coated fibers, reduced graphene oxide-coated fibers, and carbon fibers, were produced and used as key sensing elements embedded in fabrics for monitoring the manufacturing process of fiber-reinforced polymeric composites...
September 11, 2018: Materials
Douglas Rice, Ana C Barrios, Zhiwei Xiao, Anne Bogler, Edo Bar-Zeev, Francois Perreault
This study investigates the biofouling resistance of modified reverse osmosis (RO) feed spacers. Control spacers (made of polypropylene) were functionalized with a biocidal coating (silver), hydrophilic (SiO2 nanoparticles) or superhydrophobic (TMPSi-TiO2 nanoparticles) anti-adhesive coatings, or a hybrid hydrophilic-biocidal coating (graphene oxide). Performance was measured by adhesion assays, viability tests, and permeate flow decline in a bench scale RO system. The control spacers proved to be one of the better performing materials based on bacterial deposition and dynamic RO fouling experiments...
August 31, 2018: Water Research
Bo Wei, Kang Mao, Na Liu, Man Zhang, Zhugen Yang
Prostate specific antigen (PSA) is a widely used marker for the diagnosis of prostate cancer, and the increasing attention has been attracted on the development of rapid assay using biosensing technology. However, it remains challenging for the sensitive and selective detection of PSA in clinical samples. Here, we report a label-free microfluidic paper-based analytical device for highly sensitive electrochemical detection of PSA. The paper device was fabricated with wax printing to generate hydrophobic and hydrophilic layers for the construction of microfluidic channel, followed by screen-printing of three electrodes including working, counter and reference electrode...
December 15, 2018: Biosensors & Bioelectronics
Mohammad Hasanzadeh, Elham Solhi, Mohsen Jafari, Ahad Mokhtarzadeh, Jafar Soleymani, Abolghasem Jouyban, Soltanali Mahboob
Breast cancer is the most common threat in women worldwide. Increasing death rate of diagnosed cases is the main leading cause of designing specific immunoassay for tumor marker in breast cancer. Cancer antigen 15-3 (CA 15-3) is a tumor protein for many types of cancer, most notably breast cancer. Herein, we report a sandwich-type electrochemical immunosensor based on signal amplification strategy of multiple nanocomposites to detection of CA 15-3 biomarker. The proposed immunosensor fabricated by reduced graphene oxide (rGO), poly-dopamine (PDA) and amino functionalized mesoporous silica (MCM-41-NH2 ) doped by gold nanoparticles composite on the glassy carbon electrode with a large surface area which was prepared a new platform to immobilization of primary antibodies and provide excellent conductivity...
September 5, 2018: International Journal of Biological Macromolecules
Li Sun, Yuanxing Zhang, Yu Zhang, Haochen Si, Wenpeng Qin, Yihe Zhang
Reduced graphene oxide (rGO) nanosheets are exploited as a modification layer on a Ni foam-supported NiMn-LDH nanoflake array electrode via a facile dip-coating method. rGO serves as a second electron collector, which promotes rapid charge transport and improves electrochemical reaction kinetics. Asymmetric supercapacitors are also assembled exhibiting excellent electrochemical performance.
September 6, 2018: Chemical Communications: Chem Comm
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