Single-step functionalization of vertically aligned MWCNTs with Cu and Ni by chemical reduction of copper and nickel acetyl acetonate in benzyl alcohol

Carbon ◽  
2014 ◽  
Vol 73 ◽  
pp. 146-154 ◽  
Author(s):  
Gabriele M. Ilari ◽  
Niklaus Kränzlin ◽  
Rémi Longtin ◽  
Juan Ramon Sanchez-Valencia ◽  
Sebastian Schneider ◽  
...  
Keyword(s):  
Benzyl Alcohol ◽  
Chemical Reduction ◽  
Single Step ◽  
Vertically Aligned ◽  
Acetyl Acetonate

scholarly journals Composite Poly(vinyl alcohol)-Based Nanofibers Embedding Differently-Shaped Gold Nanoparticles: Preparation and Characterization

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1604
Author(s):  
Andrea Dodero ◽  
Maila Castellano ◽  
Paola Lova ◽  
Massimo Ottonelli ◽  
Elisabetta Brunengo ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Ad Hoc ◽  
Chemical Reduction ◽  
Chemical Properties ◽  
Single Step ◽  
Gold Nanostructures ◽  
Poly Vinyl Alcohol ◽  
Spherical Nanoparticles ◽  
Potential Applications ◽  
New Perspective

Poly(vinyl alcohol) nanofibrous mats containing ad hoc synthesized gold nanostructures were prepared via a single-step electrospinning procedure and investigated as a novel composite platform with several potential applications. Specifically, the effect of differently shaped and sized gold nanostructures on the resulting mat physical-chemical properties was investigated. In detail, nearly spherical nanoparticles and nanorods were first synthesized through a chemical reduction of gold precursors in water by using (hexadecyl)trimethylammonium bromide as the stabilizing agent. These nanostructures were then dispersed in poly(vinyl alcohol) aqueous solutions to prepare nanofibrous mats, which were then stabilized via a humble thermal treatment able to enhance their thermal stability and water resistance. Remarkably, the nanostructure type was proven to influence the mesh morphology, with the small spherical nanoparticles and the large nanorods leading to thinner well defined or bigger defect-rich nanofibers, respectively. Finally, the good mechanical properties shown by the prepared composite mats suggest their ease of handleability thereby opening new perspective applications.

scholarly journals Single-Step Synthesis of Vertically Aligned Carbon Nanotube Forest on Aluminium Foils

Nanomaterials ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1590 ◽  
Author(s):  
Fabien Nassoy ◽  
Mathieu Pinault ◽  
Jérémie Descarpentries ◽  
Thomas Vignal ◽  
Philippe Banet ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Large Scale ◽  
Chemical Vapour ◽  
Cost Effective ◽  
Liquid Electrolyte ◽  
Single Step ◽  
Synthesis Process ◽  
Catalyst Precursor ◽  
Ionic Liquid Electrolyte ◽  
Vertically Aligned

Vertically aligned carbon nanotube (VACNT) forests are promising for supercapacitor electrodes, but their industrialisation requires a large-scale cost-effective synthesis process suitable to commercial aluminium (Al) foils, namely by operating at a low temperature (<660 °C). We show that Aerosol-Assisted Catalytic Chemical Vapour Deposition (CCVD), a single-step roll-to-roll compatible process, can be optimised to meet this industrial requirement. With ferrocene as a catalyst precursor, acetylene as a carbon source and Ar/H2 as a carrier gas, clean and dense forests of VACNTs of about 10 nm in diameter are obtained at 615 °C with a growth rate up to 5 µm/min. Such novel potentiality of this one-step CCVD process is at the state-of-the-art of the multi-step assisted CCVD processes. To produce thick samples, long synthesis durations are required, but growth saturation occurs that is not associated with a diffusion phenomenon of iron in aluminium substrate. Sequential syntheses show that the saturation trend fits a model of catalytic nanoparticle deactivation that can be limited by decreasing acetylene flow, thus obtaining sample thickness up to 200 µm. Cyclic voltammetry measurements on binder-free VACNT/Al electrodes show that the CNT surface is fully accessible to the ionic liquid electrolyte, even in these dense VACNT forests.

Towards high-performance, low-cost quartz sensors with high-density, well-separated, vertically aligned ZnO nanowires by low-temperature, seed-less, single-step, double-sided growth

2013 ◽  
Vol 24 (35) ◽  
pp. 355503 ◽  
Author(s):  
Andrea Orsini ◽  
Pier Gianni Medaglia ◽  
David Scarpellini ◽  
Roberto Pizzoferrato ◽  
Christian Falconi
Keyword(s):  
Low Temperature ◽  
High Performance ◽  
Low Cost ◽  
Single Step ◽  
Zno Nanowires ◽  
High Density ◽  
Vertically Aligned

scholarly journals Effect of AZO Substrates on Self-Seeded Electrochemical Growth of Vertically Aligned ZnO Nanorod Arrays and Their Optical Properties

2012 ◽  
Vol 2012 ◽  
pp. 1-14 ◽  
Author(s):  
A. Peić ◽  
T. Dimopoulos ◽  
R. Resel ◽  
S. Abermann ◽  
M. Postl ◽  
...  
Keyword(s):  
Electrical Transport ◽  
Transparent Electrode ◽  
Growth Conditions ◽  
Optical Quality ◽  
Single Step ◽  
Zno Nanorod ◽  
Crystal Lattices ◽  
Single Crystalline ◽  
Electrochemical Growth ◽  
Vertically Aligned

We present a single step and an electrochemical synthesis of vertically aligned ZnO nanorod (NR) arrays, directly on transparent aluminium-doped zinc oxide (AZO) electrodes. The NRs grow from mild, aqueous-based solution at low temperature, with no need for catalysts or additional seed layer. The use of textured AZO as substrate allows for highly effective growth of hexagonally faceted, single-crystalline ZnO NRs along the wurtzitec-axis. The matching of the crystal lattices initiates a self-seeding route, thus the inherent growth habit of the AZO crystallites advances the vertical growth and alignment of NRs. Moreover, the thickness-dependant grain size of the AZO layer provides a valuable feature for tuning the diameter of ZnO NRs grown atop. In the absence of any seed mediator, the interfacial quality is expected to improve significantly. This should enhance the thermal and electrical transport throughout the whole nanostructured transparent electrode. The NR growth was investigated under systematic manipulation of the synthesis variables in order to optimize growth conditions for highly aligned, single-crystalline NRs with a large aspect ratio and a good optical quality. The structure and optical property of the AZO/ZnO NR ensembles were characterized by atomic force microscopy, scanning electron microscopy, X-ray diffraction, photoluminescence, and ultraviolet-visible transmission spectroscopy.

SYNTHESIS OF CNT-METAL OXIDE NANO-COMPOSITE ELECTRODE MATERIALS FOR SUPERCAPACITATOR BY LOW-PRESSURE MOCVD

2011 ◽  
Vol 1303 ◽  
Author(s):  
Pallavi Arod ◽  
S.A. Shivashankar
Keyword(s):  
Composite Electrode ◽  
Electrode Materials ◽  
Multiwall Carbon Nanotubes ◽  
Chemical Vapor ◽  
Single Step ◽  
Nano Composite ◽  
Low Pressure Mocvd ◽  
Steel Substrates ◽  
Multiwall Carbon ◽  
Acetyl Acetonate

ABSTRACTHomogeneous composite thin films of Fe2O3-carbon nanotube were synthesized in a novel, single-step process by metalorganic chemical vapor deposition (MOCVD) using ferric acetyl acetonate as precursor. The deposition of composite takes place in a narrow range of CVD conditions, beyond which the deposition either multiwall carbon nanotubes (MWNTs) only or hematite (α-Fe2O3) only takes place. The composite film formed on stainless steel substrates were tested for their supercapacitive properties in various aqueous electrolytes.

scholarly journals Biocatalytic reduction of benzaldehyde using vegetable wastes as enzyme sources

2017 ◽  
Vol 27 (4) ◽  
pp. 13-18
Author(s):  
Aida Solis Oba ◽  
Rosa María Martínez Pérez ◽  
Fadia Cervantes Domínguez ◽  
Heminia I Pérez Méndez ◽  
Myrna Solís Oba ◽  
...  
Keyword(s):  
Green Chemistry ◽  
Benzyl Alcohol ◽  
Chemical Reduction ◽  
Lima Bean ◽  
Toxic Waste ◽  
Aqueous Extracts ◽  
Green Pepper ◽  
Turnip Rape ◽  
Vegetable Wastes ◽  
Enzyme Source

The aqueous extracts of the following vegetable wastes were used as an enzyme source to reduce benzaldehyde to benzyl alcohol: capulin, mamey, green pepper, chili, and avocado seeds; bean, turnip rape, fava bean, lima bean, and jinicuil pods; papaya peel, and chive leaves. The highest conversions of benzaldehyde were obtained with the capulin and mamey seeds, bean pods and chive leaves (86%, 77%, 54%, and 45% of benzyl alcohol respectively). The biocatalytic methodology proposed avoids the generation of chemical toxic waste because metallic reducing agents are used in the chemical reduction; and the biological residues can be used as fertilizers. This procedure complies with some of the principles of green chemistry. 

Preparation of Al2O3-Supported Ni Catalyst and its Catalytic Hydrogenation Performance

2012 ◽  
Vol 430-432 ◽  
pp. 917-920 ◽  
Author(s):  
Wei Liu ◽  
Xian Lan Chen ◽  
Jin Yang ◽  
Ying Li ◽  
Yong Fu Zhou ◽  
...  
Keyword(s):  
Benzyl Alcohol ◽  
Catalytic Hydrogenation ◽  
Catalytic Effect ◽  
Reduction Method ◽  
Chemical Reduction ◽  
Ni Catalyst ◽  
Chemical Reduction Method ◽  
Supported Ni Catalyst ◽  
Supported Ni

The Al2O3-Supported Ni Catalyst was prepared by chemical reduction method, and take benzaldehyde as catalytic hydrogenation model to explore the effect in catalytic hydrogenation of benzaldehyde at different time and temperatures. The results show that the best temperature is between 60°Cand 80°C, and the catalytic time is about 1-2 h. Furthermore, the catalytic effect of Ni-Co/Al2O3 is best, it should be due to Co and Ni forming to alloys and obtain the function of the dual catalyst, which is conducive to benzaldehyde was activated and forming benzyl alcohol.

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