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Core shell graphene oxide

Zhi Zhang, Xuliang Lv, Yiwang Chen, Pin Zhang, Mingxu Sui, Hui Liu, Xiaodong Sun
For the purposes of strength, military equipment camouflage, and protecting the health of organisms, electromagnetic wave absorbing materials have received a lot of attention and are widely studied. In addition to having a strong absorption intensity and a wide effective absorption bandwidth, materials that are lightweight, thermally stable, and antioxidative are also highly desirable. In this study, we fabricated core⁻shell structured NiS₂@MoS₂ nanospheres anchored on reduced graphene oxide (rGO) nanosheets (NiS₂@MoS₂/rGO) by a simple two-step hydrothermal method...
February 19, 2019: Nanomaterials
Yi-Lin Liu, Cheng Yan, Gui-Gen Wang, Hua-Yu Zhang, Le-Yang Dang, Bo-Wen Wu, Zhao-Qin Lin, Xiao-Shuai An, Jiecai Han
Self-assembled Ni(OH)2 nanosheet decorated hierarchical flower-like MnCo2O4.5 nanoneedles was synthesized via a cost-effective and facile hydrothermal strategy, aiming to realize high capacity as the advanced electrode of battery-supercapacitor hybrid (BSH) device. It is demonstrated that the as-synthesized hierarchical flower-like MnCo2O4.5@Ni(OH)2-nanosheet electrode exhibits high specific capacity of 318 mAh g-1 at current density of 3 A g-1 and still maintains a capacity of 263.5 mAh g-1 at higher current density of 20 A g-1, with an extremely long cycle lifespan of 87...
February 20, 2019: ACS Applied Materials & Interfaces
Ankush K Dhawan, Jeffery W Seyler, Brian C Bohrer
The need for new and impactful materials to address the global problem of water pollution continues to be driving force in chemical research. This report presents the preparation of a core-double shell composite consisting of sand base substrate onto which sequential layers of chitosan and graphene oxide (GO) are deposited. The adsorption characteristics of this material for Pb (II) from aqueous solutions is investigated. Specifically, different initial lead concentrations are allowed to reach equilibrium with the chitosan-graphene oxide composites, after which the remaining abundance of lead in the aqueous phase is analyzed by atomic emission spectrometry...
January 2019: Heliyon
Qinmo Luo, Yifei Wang, Zehao Chen, Peiran Wei, Esther Yoo, Emily B Pentzer
Ionic liquids (ILs) have received attention for a diverse range of applications, but their liquid nature can make them difficult to handle and process and their high viscosities can lead to sub-optimal performance. As such, encapsulated ILs are attractive for their ease of handling and high surface area, and have potential for improved performance in energy storage, gas uptake, extractions, etc. Herein, we report a method to encapsulate a variety of ILs using Pickering emulsions as templates, graphene oxide (GO)-based nanosheets as particle surfactants, and interfacial polymerization for stabilization...
February 11, 2019: ACS Applied Materials & Interfaces
Gitashree Darabdhara, Manash R Das
We report the colorimetric detection and photocatalytic degradation of toxic phenolic compounds using Au@Ni loaded reduced graphene oxide (rGO) nanostructures. Core-shell nanoparticles of Au and Ni are successfully designed on rGO with size <8 nm by a solvothermal route which demonstrate excellent enzyme mimic behaviour towards the oxidation of 3,3',5,5' tetramethylbenzidine (TMB), a peroxidase substrate and towards colorimetric detection of phenols with detection limit as low as 1.68 μM, wide detection range of 1-300 μM and admirable selectivity...
January 7, 2019: Journal of Hazardous Materials
Moslem Afzali, Ali Mostafavi, Tayebeh Shamspur
For the first time, we developed an electrochemical sensor for piceatannol based on a new type of nanocomposite: graphene oxide nano sheets decorated with core-shell NiO@polypyrrole nanoparticles (NiO@Ppy/GO) mixed with nafion and casted on the surface of glassy carbon electrode. The nanocomposite was characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction and Fourier transform infrared spectroscopy (FT-IR) techniques...
May 1, 2019: Talanta
Yong Sun, Junwei Zhang, Yan Zong, Xia Deng, Hongyang Zhao, Juan Feng, Mi He, Xing Hua Li, Yong Peng, Xinliang Zheng
The exploration of high-efficiency microwave absorption materials with lightweight and hydrophobic features is highly expected to reduce or eliminate the electromagnetic pollution. Graphene-based nanocomposites are universally acknowledged as promising candidates for absorbing microwaves due to their remarkable dielectric properties and lightweight characteristic. However, the hydrophilicity of graphene may reduce their stability and restrict the applications in moist environment. Herein, a well-designed heterostructure composed of crystalline permalloy core and amorphous iron oxide shell was uniformly adhered on oleylamine-modified graphene nanosheets by a one-pot thermal decomposition method...
January 23, 2019: ACS Applied Materials & Interfaces
Shujing Chen, Abdelhafid Zehri, Qianlong Wang, Guangjie Yuan, Xiaohua Liu, Nan Wang, Johan Liu
Functional fillers, such as Ag, are commonly employed for effectively improving the thermal or electrical conductivity in polymer composites. However, a disadvantage of such a strategy is that the cost and performance cannot be balanced simultaneously. Therefore, the drive to find a material with both a cost efficient fabrication process and excellent performance attracts intense research interest. In this work, inspired by the core-shell structure, we developed a facile manufacturing method to prepare graphene-encapsulated Cu nanoparticles (GCPs) through utilizing an improved chemical vapor deposition (CVD) system with a cold wall reactor...
January 2019: ChemistryOpen
Yanan Chen, Yanbin Wang, Shuze Zhu, Chaoji Chen, Valencia A Danner, Yiju Li, Jiaqi Dai, Hongbian Li, Kun Kevin Fu, Teng Li, Yang Liu, Liangbing Hu
Nanowires have a wide range of applications, from transparent electrodes, Li-ion battery anodes, light-emitting diodes (LEDs), solar cells and electronic devices. Currently, aluminum (Al) nanowires can be synthesized by thermally induced substitution of germanium (Ge) nanowires, chemical vapor deposition on other metal substrates, and template-assisted growth methods. However, there are still challenges in fabricating extremely high-purity nanowires, large-scale manufacturing, and simplifying the synthesis process and conditions...
January 15, 2019: ACS Applied Materials & Interfaces
Tingting Pan, Baoliang Chen
A novel Shewanella@graphene core-shell composite material was fabricated following one-step bioreduction of graphene oxide (GO) by Shewanella putrefaciens CN-32. The surface properties and microstructures were characterized by FTIR, TG-DTG, SEM and TEM, which indicate that GO was effectively reduced to rGO and subsequently loaded onto the outer surface of the microbe Shewanella. CLSM was performed to get insight into the growth of the bacteria after core-shell materials formation. The reduction properties of Shewanella@graphene materials were evaluated using nitrobenzene, a representative model pollutant, as an electron acceptor...
December 5, 2018: Science of the Total Environment
U P Gawai, D K Gaikwad, M R Bodke, H A Khawal, K K Pandey, A K Yadav, S N Jha, D Bhattacharyya, B N Dole
Core-shell nanoparticles of Co (0%, 3%, and 5%) doped Ni/NiO and incorporated (5 mg) graphene oxide (GO) sheets were synthesized by a sol-gel auto-combustion method. X-ray absorption near edge structure (XANES), extended X-ray absorption fine structure (EXAFS) and pair distribution function measurements were employed for the determination of the local structure and structural properties of the samples. Due to the effect of Co doping the bond lengths of all coordinate atoms were varied. The microstructural features in the core-shell structured particles were evaluated with high-resolution transmission electron microscopy (HRTEM)...
December 20, 2018: Physical Chemistry Chemical Physics: PCCP
Zheng-Ming Wang, Takahiro Hirotsu, Haoyi Wu, Hirofumi Kanoh
The enhancement of photocatalytic activity of TiO2 can be made either by promoting absorption efficiency of photon energy or by reducing recombination losses of photogenerated charge carriers, for which fabrication of nanocomposite structure with carbon materials is an optional selection. Among various nanocarbons, graphene (G), graphene oxide (GO), and reduced graphene oxide (rGO) are more favorable as the counterpart materials because they can provide availability of both obverse and reverse surface, thus doubling effective sites for adsorption, loading of nanoparticles, and interfacial interaction with the loaded nanoparticles...
December 10, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
Luojiang Zhang, K N Hui, K S Hui, Siu Wing Or
High performance of an electrode relies largely on scrupulous design of nanoarchitectures and smart hybridization of bespoke active materials. Here, a 3D heterostructured core-shell architecture was fabricated as a supercapacitor electrode, in which Co3O4 nanowire cores were grown on nickel foam prior to the in situ deposition of layered double hydroxide (LDH) nanosheet shells. Owing to the unique configuration and hybridization, the as-fabricated Co3O4@LDH core-shell electrode exhibited high capacities of 818...
December 5, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Yanan Zhang, Yu Yang, Haichao Duan, Changli Lü
Magnetic Fe3O4@catechol-formaldehyde resin (CFR) core-shell nanospheres were fabricated via a controllable hydrothermal method. The shell thickness of Fe3O4@CFR nanospheres can be effectively regulated in the range of 10~170 nm via adjusting reaction parameters. Especially, catechol groups on the surface of nanospheres also play a significant role in mussel-inspired chemistry to further combine with graphene oxide (GO) to wrap the Fe3O4@CFR spheres. The obtained Fe3O4@CFR and Fe3O4@CFR@GO nanospheres can be used as the effective catalyst supports of small Pd nanoparticles ( < 10 nm) formed via in-situ synthesis route...
November 30, 2018: ACS Applied Materials & Interfaces
Sheng-Dong Pan, Xiao-Hong Chen, Hao-Yu Shen, Xiao-Ping Li, Mei-Qiang Cai, Yong-Gang Zhao, Mi-Cong Jin
This article has been retracted at the request of the Editor after the corresponding author pointed the Editor to comments from an anonymous reader. The article reports electron micrographs of different preparations while showing identical images as used in previous publications by the same authors. The particles in Fig. 4C (SEM image of Fe3O4@SiO2) are identical to each other and the corresponding author confirmed that these have been copy-pasted. In addition, these particles have previously been communicated as different substances in Fig...
January 10, 2019: Analytica Chimica Acta
Jianhong Ru, Yuchi Fan, Weiwei Zhou, Zhenxing Zhou, Tuo Wang, Ruiheng Liu, Jianping Yang, Xiaofang Lu, Jiancheng Wang, Chengchang Ji, Lianjun Wang, Wan Jiang
Ceramic composites with good electrical conductivity and high strength that can provide electromagnetic interference (EMI) shielding are highly desirable for the applications in harsh environment. In this study, lightweight, highly conductive, and strong mullite composites incorporated with reduced graphene oxide (rGO) are successfully fabricated by spark plasma sintering at merely 1200 °C using the core-shell structured γ-Al2 O3 @SiO2 powder as a precursor. The transient viscous sintering induced by the γ-Al2 O3 @SiO2 precursor not only prohibits the reaction between mullite and rGO by greatly reducing the sintering temperature, but also induces a highly anisotropic structure in the rGO/mullite composite, leading to an extremely high in-plane electrical conductivity (696 S m-1 for only 0...
November 14, 2018: ACS Applied Materials & Interfaces
Dong Sung Choi, Chanhoon Kim, Joonwon Lim, Su-Ho Cho, Gil Yong Lee, Ho Jin Lee, Jang Wook Choi, Heeyeon Kim, Il-Doo Kim, Sang Ouk Kim
Nanoscale materials offer enormous opportunities for catalysis, sensing, energy storage, and so on, along with their superior surface activity and extremely large surface area. Unfortunately, their strong reactivity causes severe degradation and oxidation even under ambient conditions and thereby deteriorates long-term usability. Here superlative stable graphene-encapsulated nanoparticles with a narrow diameter distribution prepared via in situ chemical vapor deposition (CVD) are presented. The judiciously designed CVD protocol generates 3 nm size metal and ceramic nanoparticles intimately encapsulated by few-layer graphene shells...
October 15, 2018: Advanced Materials
Zehui Li, Yuheng Jiang, Zhuoya Wang, Wenbo Wang, Yi Yuan, Xiaoxue Wu, Xingchen Liu, Mingjie Li, Sobia Dilpazir, Guangjin Zhang, Dongbin Wang, Chenming Liu, Jingkun Jiang
Core-shell structured particles were prepared from carbonized zeolitic imidazolate frameworks (ZIFs) and reduced graphene oxide (rGO). The particles possess a nitrogen content of up to 10.6%. The loss of nitrogen from the ZIF is avoided by utilizing the reduction and agglomeration of graphene oxide with suitable size (>2 μm) during pyrolysis. The resulting carbonized ZIF@rGO particles were deposited on a glassy carbon electrode to give an amperometric sensor for H2 O2 , typically operated at a voltage of -0...
October 9, 2018: Mikrochimica Acta
Liming Ren, Jun Dong, Zifang Chi, Huazheng Huang
Nanoscale zero-valent iron (nZVI) assembled on graphene oxide (GO) (rGO-nZVI) composites were synthesized by reduction of GO and ferrous ions with potassium borohydride, for use in Cr(VI) removal from aqueous solution. The results showed that the two-dimensional structure of GO could provide a skeleton support for Fe0 , thus overcoming the bottleneck of aggregation for nZVI. Also, rGO-nZVI would form a ferric-carbon micro-electrolysis system in Cr(VI)-contaminated aquifers, enhancing and accelerating electron transfer, exhibiting high rate and capacity for Cr(VI) removal...
November 2018: Journal of Environmental Sciences (China)
Ankita Hazarika, Biplab K Deka, DoYoung Kim, Hoon Eui Jeong, Young-Bin Park, Hyung Wook Park
Thermotherapy is a widespread technique that provides relief for muscle spasms and joint injuries. A great deal of energy is used to heat the surrounding environment, and heat emitted by the human body is wasted on our surroundings. Herein, a woven Kevlar fiber (WKF)-based personal thermal management device was fabricated by directly growing vertical copper-nickel (Cu-Ni) nanowires (NWs) on the WKF surface using a hydrothermal method. The treated WKF was combined with reduced graphene oxide (rGO) dispersed in polydimethylsiloxane (PDMS) to form composites using vacuum-assisted resin transfer molding (VARTM)...
November 14, 2018: Nano Letters
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