Rietveld Refinement, μ-Raman, X-ray Photoelectron, and Mössbauer Studies of Metal Oxide-Nanoparticles Growth on Multiwall Carbon Nanotubes and Graphene Oxide

ABSTRACTNanogenerators (NGs) have great potential to solve the problems of energy depletion and environmental pollution. Here, two types of flexible nanogenerators (FNGs) based on graphene oxide (GO) and multiwall carbon nanotubes (MW-CNTs) are presented. The peak output voltage and current of GO based FNG reached up to 2 V and 30 nA, respectively, under 15 N force at 1 Hz. Moreover, the output voltage could be improved to 34.4 V when the frequency was increased to 10 Hz. It was also found the output voltage increased from 0.1 V to 2.0 V using a released GO structure. The other FNG was made by MW-CNTs mixed with ZnO nanoparticles (NPs). Its output voltage and power reached up to 7.5 V and 18.75 mW, respectively, which is much larger than that of bare ZnO based FNG. Furthermore, a peak voltage of 30 V could be gained by stamping one’s foot on the FNG. Finally, a modified NG was fabricated using four springs and two flexible layers. As a result, the voltage and power reached up to 9 V and 27mW, respectively. These works may bring out broad applications in energy harvesting.

Download Full-text

Design of Covalently Functionalized Carbon Nanotubes Filled with Metal Oxide Nanoparticles for Imaging, Therapy, and Magnetic Manipulation

ACS Nano ◽

10.1021/nn5040923 ◽

2014 ◽

Vol 8 (11) ◽

pp. 11290-11304 ◽

Cited By ~ 69

Author(s):

Xiaojie Liu ◽

Iris Marangon ◽

Georgian Melinte ◽

Claire Wilhelm ◽

Cécilia Ménard-Moyon ◽

...

Keyword(s):

Carbon Nanotubes ◽

Metal Oxide ◽

Metal Oxide Nanoparticles ◽

Oxide Nanoparticles ◽

Functionalized Carbon Nanotubes ◽

Magnetic Manipulation

Download Full-text

Reduced graphene oxide and inorganic nanoparticles composites – synthesis and characterization

Polish Journal of Chemical Technology ◽

10.1515/pjct-2015-0074 ◽

2015 ◽

Vol 17 (4) ◽

pp. 95-103 ◽

Cited By ~ 6

Author(s):

Magdalena Onyszko ◽

Karolina Urbas ◽

Malgorzata Aleksandrzak ◽

Ewa Mijowska

Keyword(s):

Graphene Oxide ◽

Metal Oxide ◽

Reduced Graphene Oxide ◽

Zirconium Dioxide ◽

Water Solution ◽

Metal Oxide Nanoparticles ◽

Direct Synthesis ◽

Inorganic Nanoparticles ◽

Oxide Nanoparticles ◽

Reduced Graphene

Abstract Graphene – novel 2D material, which possesses variety of fascinating properties, can be considered as a convenient support material for the nanoparticles. In this work various methods of synthesis of reduced graphene oxide with metal or metal oxide nanoparticles will be presented. The hydrothermal approach for deposition of platinum, palladium and zirconium dioxide nanoparticles in ethylene glycol/water solution was applied. Here, platinum/reduced graphene oxide (Pt/RGO), palladium/reduced graphene oxide (Pd/RGO) and zirconium dioxide/reduced graphene oxide (ZrO2/RGO) nanocomposites were prepared. Additionally, manganese dioxide/reduced graphene oxide nanocomposite (MnO2/RGO) was synthesized in an oleic-water interface. The obtained nanocomposites were investigated by transmission electron microscopy (TEM), X-ray diffraction analysis (XRD), Raman spectroscopy and thermogravimetric analysis (TGA). The results shows that GO can be successfully used as a template for direct synthesis of metal or metal oxide nanoparticles on its surface with a homogenous distribution.

Download Full-text

N-Dopant-Mediated Growth of Metal Oxide Nanoparticles on Carbon Nanotubes

Nanomaterials ◽

10.3390/nano11081882 ◽

2021 ◽

Vol 11 (8) ◽

pp. 1882

Author(s):

Jin Ah Lee ◽

Won Jun Lee ◽

Joonwon Lim ◽

Sang Ouk Kim

Keyword(s):

Carbon Nanotubes ◽

Metal Oxide ◽

Carbon Nanomaterials ◽

Wide Spectrum ◽

Metal Oxide Nanoparticles ◽

Nucleation And Growth ◽

Oxide Nanoparticles ◽

Metal Oxide Nanoparticle ◽

Nucleation Sites ◽

Direct Growth

Metal oxide nanoparticles supported on heteroatom-doped graphitic surfaces have been pursued for several decades for a wide spectrum of applications. Despite extensive research on functional metal oxide nanoparticle/doped carbon nanomaterial hybrids, the role of the heteroatom dopant in the hybridization process of doped carbon nanomaterials has been overlooked. Here, the direct growth of MnOx and RuOx nanoparticles in nitrogen (N)-doped sites of carbon nanotubes (NCNTs) is presented. The quaternary nitrogen (NQ) sites of CNTs actively participate in the nucleation and growth of the metal nanoparticles. The evenly distributed NQ nucleation sites mediate the generation of uniformly dispersed <10 nm diameter MnOx and RuOx nanoparticles, directly decorated on NCNT surfaces. The electrochemical performance of the resultant hybridized materials was evaluated using cyclic voltammetry. This novel hybridization method using the dopant-mediated nucleation and growth of metal oxides suggests ways that heteroatom dopants can be utilized to optimize the structure, interface and corresponding properties of graphitic carbon-based hybrid materials.

Download Full-text

Si-mediated fabrication of reduced graphene oxide and its hybrids for electrode materials

Green Chemistry ◽

10.1039/c4gc01485e ◽

2015 ◽

Vol 17 (2) ◽

pp. 776-780 ◽

Cited By ~ 4

Author(s):

Barun Kumar Barman ◽

Karuna Kar Nanda

Keyword(s):

Carbon Nanotubes ◽

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Electrode Materials ◽

Multiwall Carbon Nanotubes ◽

Environmentally Friendly ◽

Si Substrate ◽

Reduced Graphene ◽

Multiwall Carbon

We demonstrate a Si-mediated environmentally friendly reduction of graphene oxide (GO) and the fabrication of hybrid electrode materials with multiwall carbon nanotubes and nanofibers. The reduction of GO is facilitated by the nascent hydrogen generated by the reaction between Si and KOH. The overall process consumes 10 to 15 μm of Si each time and the same Si substrate can be used multiple times.

Download Full-text

Enhanced thermal conductivity by aggregation in heat transfer nanofluids containing metal oxide nanoparticles and carbon nanotubes

Applied Physics Letters ◽

10.1063/1.2834370 ◽

2008 ◽

Vol 92 (2) ◽

pp. 023110 ◽

Cited By ~ 84

Author(s):

Jesse Wensel ◽

Brian Wright ◽

Dustin Thomas ◽

Wayne Douglas ◽

Bert Mannhalter ◽

...

Keyword(s):

Heat Transfer ◽

Thermal Conductivity ◽

Carbon Nanotubes ◽

Metal Oxide ◽

Metal Oxide Nanoparticles ◽

Oxide Nanoparticles ◽

Enhanced Thermal Conductivity

Download Full-text

Microwave-Assisted Functionalization of Carbon Nanotubes and In Situ Coating Carbon Nanotubes with Metal Oxide Nanoparticles for Electrochemical Capacitor Applications

ECS Meeting Abstracts ◽

10.1149/ma2009-02/5/264 ◽

2009 ◽

Keyword(s):

Carbon Nanotubes ◽

Metal Oxide ◽

Metal Oxide Nanoparticles ◽

Electrochemical Capacitor ◽

Oxide Nanoparticles ◽

Microwave Assisted ◽

Functionalization Of Carbon Nanotubes ◽

In Situ Coating

Download Full-text

Biodiesel production from waste cooking oil using a novel heterogeneous catalyst based on graphene oxide doped metal oxide nanoparticles

Renewable Energy ◽

10.1016/j.renene.2020.10.046 ◽

2020 ◽

Vol 162 ◽

pp. 2182-2189 ◽

Cited By ~ 1

Author(s):

Binta Hadi Jume ◽

Mohammad Ali Gabris ◽

Hamid Rashidi Nodeh ◽

Shahabaldin Rezania ◽

Jinwoo Cho

Keyword(s):

Graphene Oxide ◽

Metal Oxide ◽

Heterogeneous Catalyst ◽

Metal Oxide Nanoparticles ◽

Waste Cooking Oil ◽

Biodiesel Production ◽

Oxide Nanoparticles ◽

Cooking Oil

Download Full-text

A comparison of the radiosensitisation ability of 22 different element metal oxide nanoparticles using clinical megavoltage X-rays

Cancer Nanotechnology ◽

10.1186/s12645-019-0057-9 ◽

2019 ◽

Vol 10 (1) ◽

Cited By ~ 1

Author(s):

Alexandra Guerreiro ◽

Nicholas Chatterton ◽

Eleanor M. Crabb ◽

Jon P. Golding

Keyword(s):

Dna Damage ◽

Metal Oxide ◽

Hydroxyl Radical ◽

Singlet Oxygen ◽

Hydroxyl Radicals ◽

Metal Oxide Nanoparticles ◽

Oxide Nanoparticles ◽

X Rays ◽

X Ray ◽

Wide Range

Abstract Background A wide range of nanoparticles (NPs), composed of different elements and their compounds, are being developed by several groups as possible radiosensitisers, with some already in clinical trials. However, no systematic experimental survey of the clinical X-ray radiosensitising potential of different element nanoparticles has been made. Here, we directly compare the irradiation-induced (10 Gy of 6-MV X-ray photon) production of hydroxyl radicals, superoxide anion radicals and singlet oxygen in aqueous solutions of the following metal oxide nanoparticles: Al2O3, SiO2, Sc2O3, TiO2, V2O5, Cr2O3, MnO2, Fe3O4, CoO, NiO, CuO, ZnO, ZrO2, MoO3, Nd2O3, Sm2O3, Eu2O3, Gd2O3, Tb4O7, Dy2O3, Er2O3 and HfO2. We also examine DNA damage due to these NPs in unirradiated and irradiated conditions. Results Without any X-rays, several NPs produced more radicals than water alone. Thus, V2O5 NPs produced around 5-times more hydroxyl radicals and superoxide radicals. MnO2 NPs produced around 10-times more superoxide anions and Tb4O7 produced around 3-times more singlet oxygen. Lanthanides produce fewer hydroxyl radicals than water. Following irradiation, V2O5 NPs produced nearly 10-times more hydroxyl radicals than water. Changes in radical concentrations were determined by subtracting unirradiated values from irradiated values. These were then compared with irradiation-induced changes in water only. Irradiation-specific increases in hydroxyl radical were seen with most NPs, but these were only significantly above the values of water for V2O5, while the Lanthanides showed irradiation-specific decreases in hydroxyl radical, compared to water. Only TiO2 showed a trend of irradiation-specific increase in superoxides, while V2O5, MnO2, CoO, CuO, MoO3 and Tb4O7 all demonstrated significant irradiation-specific decreases in superoxide, compared to water. No irradiation-specific increases in singlet oxygen were seen, but V2O5, NiO, CuO, MoO3 and the lanthanides demonstrated irradiation-specific decreases in singlet oxygen, compared to water. MoO3 and CuO produced DNA damage in the absence of radiation, while the highest irradiation-specific DNA damage was observed with CuO. In contrast, MnO2, Fe3O4 and CoO were slightly protective against irradiation-induced DNA damage. Conclusions Beyond identifying promising metal oxide NP radiosensitisers and radioprotectors, our broad comparisons reveal unexpected differences that suggest the surface chemistry of NP radiosensitisers is an important criterion for their success.

Download Full-text