Silica coating of silver nanoparticles using a modified Stöber method

Kobayashi, Yoshio; Katakami, Hironori; Mine, Eiichi; Nagao, Daisuke; Konno, Mikio; Liz‐Marzán, Luis M.

doi:10.1016/j.jcis.2004.08.184

Cited by 336 publications

(303 citation statements)

References 29 publications

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“…The formation of colloidal silver nanoparticles using different reducing agents was evaluated by UV-Vis spectroscopy [20,[24][25][26]. Figures 1 and 2 show the UV-Vis spectra of the different silver nanoparticles synthesised at two different agitation rates and as a function of time.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, when gelatine and Aloe vera extract were used as green reducing agents, a displacement of the plasmon resonance band towards higher wavelengths, around 435 nm, was observed ( Figure 2) corresponding to an average particle size of 10-20 nm [19,25]. In this case, there was no influence of the two different agitation rates studied on the average silver particle size, which might be due to a stabilising effect of both green reducing agents characterised by the immobilisation of the silver nanoparticles embedded in a polymeric matrix that avoids their aggregation and/or precipitation.…”

Section: Resultsmentioning

confidence: 99%

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Antimicrobial Effect of Coated Leather Based on Silver Nanoparticles and Nanocomposites: Synthesis, Characterisation and Microbiological Evaluation

M¹

2015

J Biotechnol Biomater

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This paper describes the assessment of the antimicrobial effect of leathers employed for footwear production, which were obtained by different tanning techniques and treated with silver nanoparticles emulsions synthesised from different reducing agents (sodium borohydride, gelatine/glucose and Aloe vera extract), as well as the assessment of the silica nancomposites obtained from said nanoparticles. After the characterisation of silver nanoparticles and nanocomposites, the emulsions were applied onto different leather samples. Scanning Electron Microscopy was used to verify that silver nanoparticles were deposited on the collagen fibres surface and inside the collagen matrix of leather. The antibacterial effect of different silver nanoparticles and silver nanocomposites was assessed on gram positive and gram negative bacterial strains in agar diffusion assays and turbidimetric tests. The results obtained proved a powerful antibacterial effect on all bacterial strains tested of both silver nanoparticles and silica nanocomposites. This allows us to consider the incorporation of these nanocomposites into leather as an alternative to other commercially available products in order to obtain leather with antimicrobial properties that confer better functionality and added value.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Antimicrobial Effect of Coated Leather Based on Silver Nanoparticles and Nanocomposites: Synthesis, Characterisation and Microbiological Evaluation

M¹

2015

J Biotechnol Biomater

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“…To maintain the stability of the Ag-NPs for practical purpose, usually Ag-NPs combined with some polymeric composites such as polyvinyl alcohol (PVA), polypyrrole (PPy), carbonxymethyl cellulose (CMC) [3,4], biocompatible moleculessuch as bovine serum albumin (BSA) [5,6] and semiconductor such assilica [7]. Numerous studies have been also reported in numerical approximation to investigate the LSPR spectra, such as determining the interaction between Ag-NPs and PVA using density functional theory (DFT) to calculate the binding energy [8], finite different time domain (FDTD)method to produce the LSPR spectra Ag-NPs nanocubes [9], and the calculation the scattering intensity in the nanoshell model [10,11].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Plasmon Resonance Silver Nanoparticles Coated Polyvinyl Alcohol (PVA) using Bohren-Huffman-Mie Approximation

Djuhana¹

2016

KEG

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In this study, we have investigated the LSPR spectra of the silver nanoparticles (Ag-NPs) coatedby polyvinyl alcohol (PVA) by means of a numerical study using Bohren-Huffman-Mie (BHMie) approximation. The LSPR of Ag-NPs shifted to red-shift as the diameter size of Ag-NPs and the thickness of PVA increased. The peak of the LSPR spectra exponentially increased as the thickness increased. Interestingly, there have three characteristic of the LSPR spectra, small, intermediate, and large diameter. In small diameter, the dipole resonant mode contributed to the LSPR spectra while in large diameter, the LSPR spectra originated from the quadrupole resonant mode. In contrast to intermediate diameter, the LSPR spectra originated from the competition between the dipole and the quadrupole mode. For this reason, at small and large diameter the LSPR peak has one peak and increased then until a certain thickness showed constant. Different at intermediate diameter, the LSPR peak appeared more one peak with major peak increased then until a certain thickness trend to decrease and minor peak followed at small diameter behavior.

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“…Монодисперсные ядра частиц были получены в результате коллоидного синтеза по методу [12], а для создания оболочек использовался модифицированный метод Штобера [13]. Для получения различной толщины диэлектрической оболочки h s к спиртовому раство-ру частиц серебра добавлялось различное количество источника оксида кремния -тетраэтоксисилана [14], который в результате реакции гидролиза и поликонденсации преобразовывался в диоксид кремния.…”

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“…При увеличении h s происходит смещение максимума плазмонного резонанса в низкочастотную область, обусловленное из-менением диэлектрической проницаемости окружающей среды. Спект-ральные данные коррелируют с результатами работ по коллоидным наночастицам Ag/SiO 2 [13] и Au/SiO 2 [16], в которых аналогичное смещение также наблюдалось для частиц с оболочками до 40 nm. Расчетные толщины оболочек были соотнесены с измерениями выбо-рочных образцов методом атомно-силовой микроскопии и оказались водниковых частиц с нижележащим слоем наночастиц Ag/SiO 2 .…”

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Усиление люминесценции квантовых точек вблизи слоя наночастиц Ag/SiO-=SUB=-2-=/SUB=-

Матюшкин¹,

Перцова²,

Мошников³

2018

Письма В Журнал Технической Физики

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We have studied the influence of monodisperse Ag/SiO_2 core–shell-type nanoparticles with a core diameter of 17 nm and a dielectric-shell thickness within 0–40 nm on the photoluminescence of CdSe/ZnS quantum dots (QDs) excited by laser at a wavelength corresponding to the plasmon resonance in Ag/SiO_2 nanoparticles. It is established that the intensity of QD luminescence in the composite system exhibits up to 8.7-fold increase.

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Silica coating of silver nanoparticles using a modified Stöber method

Cited by 336 publications

References 29 publications

Antimicrobial Effect of Coated Leather Based on Silver Nanoparticles and Nanocomposites: Synthesis, Characterisation and Microbiological Evaluation

Antimicrobial Effect of Coated Leather Based on Silver Nanoparticles and Nanocomposites: Synthesis, Characterisation and Microbiological Evaluation

Numerical Study of Plasmon Resonance Silver Nanoparticles Coated Polyvinyl Alcohol (PVA) using Bohren-Huffman-Mie Approximation

Усиление люминесценции квантовых точек вблизи слоя наночастиц Ag/SiO-=SUB=-2-=/SUB=-

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