Stable nano-sized copper and its oxide particles using cobalt tetraamino phthalocyanine as a stabilizer; application to electrochemical activity

Sannegowda, Lokesh Koodlur; Reddy, K. R. Venugopala; Shivaprasad, K.H.

doi:10.1039/c3ra42682c

Cited by 34 publications

(11 citation statements)

References 41 publications

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“…The same XRD pattern was observed for resulting Cu-NPs having peaks at 43° for FCC before exposing to air. On exposing to air for 24 hours, the broader peaks at 36.8°, 60.9° was observed due to formation of CuO-NPs and a very weak peak were observed for Cu-NPs 70 . Thus, FCC crystals of Cu-NPs were successfully synthesized on all the surfaces.…”

Section: Resultsmentioning

confidence: 98%

Chitosan-titanium oxide fibers supported zero-valent nanoparticles: Highly efficient and easily retrievable catalyst for the removal of organic pollutants

Ali

Khan

Kamal

et al. 2018

Sci Rep

132

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Different chitosan-titanium oxide (CS-TiO2-x, with x = TiO2 loadings of 1, 5, 10,15 and 20 wt%) nanocomposite fibers were prepared and kept separately in each salt solution of CuSO4, CoNO3, AgNO3 and NiSO4 to adsorb Cu2+, Co2+, Ag+, and Ni+ ions, respectively. The metal ions loaded onto CS-TiO2 fibers were reduced to their respective zero-valent metal nanoparticles (ZV-MNPs) like Cu0, Co0, Ag0 and Ni0 by treating with NaBH4. The CS-TiO2 fibers templated with various ZV-MNPs were characterized and investigated for their catalytic efficiency. Among all prepared ZV-MNPs, Cu0 nanoparticles templated on CS-TiO2-15 fibers exhibited high catalytic efficiency for the reduction of dyes (methyl orange (MO), congo red (CR), methylene blue (MB) and acridine orange (AO)) and nitrophenols (4-nitrohphenol (4-NP), 2-nitrophenol (2-NP), 3-nitrophenol (3-NP) and 2,6-dinitrophenol (2,6-DNP)). Besides the good catalytic activities of Cu/CS-TiO2-15 fibers, it could be easily recovered by simply pulling the fiber from the reaction medium.

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Section: Resultsmentioning

confidence: 98%

Chitosan-titanium oxide fibers supported zero-valent nanoparticles: Highly efficient and easily retrievable catalyst for the removal of organic pollutants

Ali

Khan

Kamal

et al. 2018

Sci Rep

132

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“…In addition, (vertical) superlattices, formed by alternatingly stacked thin layers of two semiconductor materials with different band gaps, are used to create materials with a specific band structure for applications in electronic and optical devices . When applied to nanoparticles, thin capping layers may be used to tune their chemical reactivity, e.g., to avoid oxidation or aggregation …”

Section: Introductionmentioning

confidence: 99%

“…4 In addition, (vertical) superlattices, formed by alternatingly stacked thin layers of two semiconductor materials with different band gaps, are used to create materials with a specific band structure for applications in electronic and optical devices. 5 When applied to nanoparticles, thin capping layers may be used to tune their chemical reactivity, e.g., to avoid oxidation 6 or aggregation. 7 When two incommensurate atomic lattices are stacked on top of each other, they can exhibit a large-scale commensurability, and as a result a superlattice emerges, having a periodicity that is larger than that of the two lattices involved.…”

Section: Introductionmentioning

confidence: 99%

Engineering the Band Structure of Nanoparticles by an Incommensurate Cover Layer

Schouteden

Iancu

et al. 2014

J. Phys. Chem. C

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The electronic properties of nanometer size Au(111) vacancy islands are modified by covering the islands with an atomically thin NaCl(001) layer. The large-scale commensurability between the atomic lattices of the cover layer and the islands gives rise to various Moire-effect-induced standing wave patterns of which the periodicity and orientation depend on the relative angle between the lattices. The observed standing wave patterns are accompanied by the formation of multiple band gaps resulting from the Moire-effect-related periodic potential. Moreover, the energy level quantization and the coverlayer-induced energy shift give rise to partial depopulation of the NaCl/Au interface state. Targeted use of a thin covering layer and the resulting Moire-effect-related potential offers yet unexploited possibilities to conveniently modify the electronic structure of nanoparticles.

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“…The reaction at pH 8 resulted in particles of irregular shape and average 3.52 ± 0.72 nm size as well as their 40 nm agglomerates (38.36 ± 10.87 nm). The agglomeration may be a result of the partial oxidation of copper and in turn the enhancement of electrostatic attraction between nanoparticles, whereas the increase in the size of the primary nanoparticle can be attributed to the expansion of crystal lattice when metallic copper is oxidized into copper oxide . Similarly, at pH 5, fine nanoparticles of an average size 2.69 ± 0.55 nm agglomerated to form larger and stable spherical 30 nm stable clusters (Figure ), with the occurrence of also single and stable 10 nm CuNPs (9.24 ± 0.89).…”

Section: Resultsmentioning

confidence: 99%

Reactivity of (+)-Catechin with Copper(II) Ions: The Green Synthesis of Size-Controlled Sub-10 nm Copper Nanoparticles

Podstawczyk

Pawłowska

Bastrzyk

et al. 2019

ACS Sustainable Chem. Eng.

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The synthesis of metal nanoparticles via greener and sustainable methods has gained a great attention because of the use of natural products which are nontoxic and environmentally benign. Though many efforts have been made to prepare nanostructures employing plant extracts rich in polyphenols, their role in the formation of nanoparticles has not been fully investigated. This paper demonstrates a route of size-controllable synthesis of copper nanoparticles (CuNPs) using (+)-catechin solution and the chemistry behind the reaction. Altering pH of process parameters allowed for the formation of nanoparticles with sizes ranging from 3 to 40 nm evaluated by high-resolution transmission electron microscopy. The results revealed that the higher the pH, the smaller and the more stable nanoparticles are obtained. Higher concentrations of copper(II) ions [Cu(II)] created larger nanostructures which tended to aggregate. Stable, monodisperse CuNPs with a diameter of about 3 nm were obtained for a (+)-catechin to a Cu(II) molar ratio of 2:1 and pH 11. HPLC analysis showed that (+)-catechin solution at pH 11 contains procyanidins as major phenolic components, and their type and content depend on the presence of copper(II) ions. The proposed mechanism of CuNP synthesis reaction involves pH-dependent oxidation of (+)-catechin and simultaneous reduction of Cu(II).

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Stable nano-sized copper and its oxide particles using cobalt tetraamino phthalocyanine as a stabilizer; application to electrochemical activity

Abstract: CVs showing the electrocatalytic reduction of dioxygen with (a) bare GC; GC modified with (b) CoPTA; (c) metallic oxide nanoparticles after exposing the particles to air for 1 day and (d) CoPTA capped copper nanoparticles.

Cited by 34 publications

References 41 publications

Chitosan-titanium oxide fibers supported zero-valent nanoparticles: Highly efficient and easily retrievable catalyst for the removal of organic pollutants

Chitosan-titanium oxide fibers supported zero-valent nanoparticles: Highly efficient and easily retrievable catalyst for the removal of organic pollutants

Engineering the Band Structure of Nanoparticles by an Incommensurate Cover Layer

Reactivity of (+)-Catechin with Copper(II) Ions: The Green Synthesis of Size-Controlled Sub-10 nm Copper Nanoparticles

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