Preparation of Monodispersed Copper Nanoparticles by an Environmentally Friendly Chemical Reduction

Li, Meijuan; Xiang, Kun; Luo, Guoqiang; Gong, Decai; Shen, Qiang; Zhang, Lianmeng

doi:10.1002/cjoc.201300423

Cited by 28 publications

(16 citation statements)

References 39 publications

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“…The surface plasmon resonance (SPR) and oxidation resistance of CNPs show strong dependence on reaction time, pH and relative ratio of surfactant to Cu salt. Li et al [24] have developed a chemical reduction method for the synthesis of uncapped CNPs which are stable for several months. They have also demonstrated that the size and size distribution of CNPs can be controlled by altering the order of addition of chemical reagents in the synthesis.…”

Section: Introductionmentioning

confidence: 99%

Role of hydrodynamic size in colloidal and optical stability of plasmonic Copper nanoparticles

Sharma

Goyal

Chudasama

2019

Micro & Nano Letters

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Metallic nanoparticles (NPs) exhibit interesting plasmonic characteristics that depend on their size, shape and dielectric medium. Any change in these parameters can lead to significant alternation in plasmonic behaviour of NPs. Plasmonic nanostructures are prepared by wet chemical approaches, which produce NPs with a moderate yield. Amongst plasmonic class of NPs, gold and silver are widely explored in sensors because of their strong plasmon excitation. Copper NPs (CNPs) are gaining increasing attention in plasmonic sensors because of its economic advantages over silver and gold. However, major limitations of these nanostructures are their low yield and poor colloidal stability. In this Letter, authors report scale up of CNPs yield by 100% and studied their colloidal stability in terms of changes in hydrodynamic size and its influence on surface plasmon resonance (SPR). It has been observed that SPR of CNPs is independent of their yield. A gradual decrease in SPR is observed with ageing. This can be attributed to the aggregation-induced microstructural changes in the dispersion. CNPs irrespective of their yield are stable up to 180 days beyond which they lose their colloidal stability and plasmonic properties. Loss of colloidal and plasmonic characteristics of CNPs can be attributed to enhanced hydrodynamic size.

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Section: Introductionmentioning

confidence: 99%

Role of hydrodynamic size in colloidal and optical stability of plasmonic Copper nanoparticles

Sharma

Goyal

Chudasama

2019

Micro & Nano Letters

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“…[1][2][3][4][5][6][7] Among these materials, nano copper has always been a hot issue specifically due to its low processing costs and potential applications in lubrication, electrical and thermal conductivity, nanofluids, and catalytic reactions, [8][9][10][11][12] while the basic properties of Cu colloidal particles mainly depend on their size, shape, crystallinity and structure, which exactly determine their practical applications. [1][2][3][4][5][6][7] Among these materials, nano copper has always been a hot issue specifically due to its low processing costs and potential applications in lubrication, electrical and thermal conductivity, nanofluids, and catalytic reactions, [8][9][10][11][12] while the basic properties of Cu colloidal particles mainly depend on their size, shape, crystallinity and structure, which exactly determine their practical applications.…”

Section: Introductionmentioning

confidence: 99%

Highly stable and re-dispersible nano Cu hydrosols with sensitively size-dependent catalytic and antibacterial activities

Zhang

Zhu

et al. 2015

Nanoscale

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Highly stable monodispersed nano Cu hydrosols were facilely prepared by an aqueous chemical reduction method through selecting copper hydroxide (Cu(OH)2) as the copper precursor, poly(acrylic acid) (PAA) and ethanol amine (EA) as the complexing agents, and hydrazine hydrate as the reducing agent. The size of the obtained Cu colloidal nanoparticles was controlled from 0.96 to 26.26 nm by adjusting the dosage of the copper precursor. Moreover, the highly stable nano Cu hydrosols could be easily concentrated and re-dispersed in water meanwhile maintaining good dispersibility. A model catalytic reaction of reducing p-nitrophenol with NaBH4 in the presence of nano Cu hydrosols with different sizes was performed to set up the relationship between the apparent kinetic rate constant (kapp) and the particle size of Cu catalysts. The experimental results indicate that the corresponding kapp showed an obvious size-dependency. Calculations revealed that kapp was directly proportional to the surface area of Cu catalyst nanoparticles, and also proportional to the reciprocal of the particle size based on the same mass of Cu catalysts. This relationship might be a universal principle for predicting and assessing the catalytic efficiency of Cu nanoparticles. The activation energy (Ea) of this catalytic reaction when using 0.96 nm Cu hydrosol as a catalyst was calculated to be 9.37 kJ mol(-1), which is considered an extremely low potential barrier. In addition, the synthesized nano Cu hydrosols showed size-dependent antibacterial activities against Pseudomonas aeruginosa (P. aeruginosa) and the minimal inhibitory concentration of the optimal sample was lower than 5.82 μg L(-1).

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“…Spherical-shaped CuNPs of average size less than 6 nm have been formed by this method (Li et al 2013). Sodium borohydride has been used as chemical reducing agent along with polyethylene glycol (PEG) as capping agent for the reduction of CuSO 4 · 5H 2 O where ascorbic acid acted as antioxidant for colloidal copper.…”

Section: Chemical Reductionmentioning

confidence: 99%

Metallic Nanoparticles, Toxicity Issues and Applications in Medicine

Singla

Guliani

Kumari

et al. 2016

Nanoscale Materials in Targeted Drug Delivery, Theragnosis and Tissue Regeneration

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The metallic nanoparticles (NPs) and their synthetic biology are an active area fascinating both the academics as well as scientific research applications in the field of nanotechnology. These nanostructures are a versatile class of materials such as metal NPs, metal oxide NPs, magnetic NPs and quantum dots for biomedical sciences and engineering due to their huge potential. A handful number of methods are adopted for the synthesis of one or the other kind of metal NPs which includes physical and chemical approaches. Each of the chemical and physical synthesis procedures deals with some limitations such as cost ineffectiveness, use of hazardous chemicals, formation of toxic end products and involvement of high-energy processes. To overcome these drawbacks, an alternative approach of environmentally benign and inexpensive biological synthesis mediated by plants or microbes has been essentially adopted. The variations in size, shape and surface chemistry of NPs affect the properties of metal NPs to a greater extent which in turn have an influence on their biological behaviour. Few metal NPs offer unique optical properties while others possess paramagnetic behaviour and quantum size effect which make them suitable in bio-imaging diagnostic techniques. Some metallic NPs play a role in tissue engineering and other therapeutic applications due to their ease of surface modifications, large surface area to volume ratio, unique electrical and anti-microbial activities. Instead of multi-disciplinary applications of metallic NPs, there is a great concern regarding the toxicity issues associated with the use of these NPs which need to be sorted out by looking out certain ways for favourable architecture involving the synthesis methods and parameters for designing the non-toxic NPs for improving the quality of life.

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Preparation of Monodispersed Copper Nanoparticles by an Environmentally Friendly Chemical Reduction

Cited by 28 publications

References 39 publications

Role of hydrodynamic size in colloidal and optical stability of plasmonic Copper nanoparticles

Role of hydrodynamic size in colloidal and optical stability of plasmonic Copper nanoparticles

Highly stable and re-dispersible nano Cu hydrosols with sensitively size-dependent catalytic and antibacterial activities

Metallic Nanoparticles, Toxicity Issues and Applications in Medicine

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