Optical properties and extinction spectroscopy to characterize the synthesis of amine capped silver nanoparticles

Roldán, María Virginia; Scaffardi, Lucia; Sanctis, O. de; Pellegri, N.

doi:10.1016/j.matchemphys.2008.06.057

Cited by 42 publications

(29 citation statements)

References 21 publications

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“…The third method involves prolonged heating of silver ions in solution in presence of weak reducing agents such as ascorbic acid, sodium citrate, and glucose (Lee et al 2004;Yin et al 2004;Yu and Yam 2004). Most of these methods involve the utilization of harsh reducing agents, capping agents, and organic solvents (Jana and Peng 2003;Qu et al 2006;Roldan et al 2008), which are carcinogenic, and these factors should be considered expensive from an economic and ''green'' chemistry perspective. Therefore, it is necessary to develop environmentally sustainable processes, involving green chemistry principles, for the preparation of silver nanoparticles using biocompatible reducing agents.…”

Section: Introductionmentioning

confidence: 99%

Eco-friendly green synthesis of silver nanoparticles using salmalia malabarica: synthesis, characterization, antimicrobial, and catalytic activity studies

et al. 2015

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An economically viable and ''green'' process has been developed for the synthesis of silver nanoparticles (AgNPs) with an average size of 7 nm using non-toxic and renewable salmalia malabarica gum (SMG) as reducing and capping agent without using any chemical reducing agent. The effect of various parameters such as concentration of SMG and silver nitrate and reaction time for the synthesis of AgNPs was studied. The synthesized AgNPs are systematically characterized by UV/Vis spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction and Transmission electron microscopy. The resultant SMG-capped AgNPs are highly stable and had significant antibacterial action on both Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). The catalytic action of the SMG-capped AgNPs to initiate the reduction of 4-nitrophenol (4-NP) in the presence of NaBH 4 has also been reported. The kinetics of the reaction was found to be of pseudo-first-order with respect to the 4-NP.

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Section: Introductionmentioning

confidence: 99%

Eco-friendly green synthesis of silver nanoparticles using salmalia malabarica: synthesis, characterization, antimicrobial, and catalytic activity studies

et al. 2015

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“…In this sense, optical extinction spectroscopy has demonstrated its ability to size core radius and shell thickness of noble metal Nps through the fitting of the full UV-Vis extinction spectra using Mie's theory 14 together with a conveniently modified metal bulk complex dielectric function that includes the size correction of free and bound electrons contributions. [15][16][17][18][19] During the last years, there has been a lot of research about Cu-Cu oxide nanocomposites [20][21][22][23][24][25][26][27][28] covering different aspects such as fabrication methods, optical properties, and structural analyses. From a general point of view, it can be said that knowledge of the mechanisms responsible for the formation of Cu-Cu oxide Nps is far from complete and may vary with the different conditions under which they were fabricated.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the structure, configuration, and sizing of Cu and Cu oxide nanoparticles generated by fs laser ablation of solid target in liquids

Santillán

Videla

Raap

et al. 2013

Journal of Applied Physics

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We report on the analysis of structure, configuration, and sizing of Cu and Cu oxide nanoparticles (Nps) produced by femtosecond (fs) laser ablation of solid copper target in liquids. Laser pulse energy ranged between 500 lJ and 50 lJ. Water and acetone were used to produce the colloidal suspensions. The study was performed through optical extinction spectroscopy using Mie theory to fit the full experimental spectra, considering free and bound electrons size dependent contributions to the metal dielectric function. Raman spectroscopy and AFM technique were also used to characterize the sample. Considering the possible oxidation of copper during the fabrication process, two species (Cu and Cu 2 O) arranged in two structures (bare core or core-shell) and in two configuration types (Cu-Cu 2 O or Cu 2 O-Cu) were considered for the fitting depending on the laser pulse energy and the surrounding media. For water at high energy, it can be observed that a CuCu 2 O configuration fits the experimental spectra of the colloidal suspension, while for decreasing energy and below a certain threshold, a Cu 2 O-Cu configuration needs to be included for the optimum fit. Both species coexist for energies below 170 lJ for water. On the other hand, for acetone at high energy, optimum fit of the full spectrum suggests the presence a bimodal Cu-Cu 2 O core-shell Nps distribution while for decreasing energy and below a 70 lJ threshold energy value, Cu 2 O-Cu core-shell Nps must be included, together with the former configuration, for the fit of the full spectrum. We discuss possible reasons for the changes in the structural configuration of the core-shell Nps. V C 2013 American Institute of Physics. [http://dx

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“…Aminosilane-stabilised Ag nanoparticles (Ag-ATS) were prepared by a colloidal method following the process previously described [42,51]. Silver nitrate was dissolved in ethanol under ultrasound stirring and mixed with ATS in ethanol under N 2 atmosphere with final ratios equal to 12 mM AgNO 3 and 62.5 mM ATS.…”

Section: Preparation Of Silver Nanoparticlesmentioning

confidence: 99%

“…Different methods have been employed to prepare shape-and size-controlled suspensions of silver nanoparticles [39], including chemical reduction of silver salts in solution [40][41][42], thermal decomposition in organic solvents [43], biochemical reduction [44], chemical and photo-reduction in reverse micelles [45], 'nanosphere lithography' (NSL) [46], electrochemical reduction [47,48], photo-reduction [49], and microwave-assisted techniques [50]. Each method has typical advantages and disadvantages.…”

Section: Introductionmentioning

confidence: 99%

“…We have selected an effective method to incorporate Ag-NPs reported in [42,51] to the synthesis of SiO 2 and TiO 2 sols for obtaining Ag-SiO 2 and dense and mesoporous Ag-TiO 2 coatings by sol-gel. Moreover, the incorporation of Ag-NPs suspensions to the sols was optimised to ensure a homogeneous distribution of the nanoparticles in the coatings, thus avoiding the agglomeration of the nanoparticles in the TiO 2 surface and their possible dissolution as previously reported.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced photocatalytic activity of mesoporous SiO2/TiO2 sol–gel coatings doped with Ag nanoparticles

Roldán

Castro

Pellegri

et al. 2015

J Sol-Gel Sci Technol

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In the present study, as-prepared silver nanoparticles have been incorporated into SiO 2 and TiO 2 sols. The characterisation of the silver nanoparticles was performed through transmission electron microscopy, grazing X-ray diffraction, and UV-visible spectroscopy, before and after mixing with the different sols. Multilayer coatings doped with silver nanoparticles were also prepared by combining different compositions and analysed by TEM and GXRD. The photocatalytic activity was studied through the degradation of methyl orange in aqueous solution under UV light exposure. High photocatalytic efficiency was observed for all the multilayer coatings. The highest efficiency was obtained for the Ag-SiO 2 /TiO 2 mesoporous system that reached a degradation percentage of methyl orange up to 94 % after 2.5 h of irradiation, near the complete elimination of the pollutant. The mechanism that explains the high photocatalytic efficiency of this multilayer coating is associated with the high porosity of the mesoporous coatings and with the increase in the local electric field, associated with the effect of plasmon resonance surface produced for the presence of metallic silver nanoparticles in the SiO 2 film.

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Optical properties and extinction spectroscopy to characterize the synthesis of amine capped silver nanoparticles

Cited by 42 publications

References 21 publications

Eco-friendly green synthesis of silver nanoparticles using salmalia malabarica: synthesis, characterization, antimicrobial, and catalytic activity studies

Eco-friendly green synthesis of silver nanoparticles using salmalia malabarica: synthesis, characterization, antimicrobial, and catalytic activity studies

Analysis of the structure, configuration, and sizing of Cu and Cu oxide nanoparticles generated by fs laser ablation of solid target in liquids

Enhanced photocatalytic activity of mesoporous SiO2/TiO2 sol–gel coatings doped with Ag nanoparticles

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