Block copolymer-mediated synthesis of silver nanoparticles from silver ions in aqueous media

Sakai, Toshio; Ishihara, Akihiro; Alexandridis, Paschalis

doi:10.1016/j.colsurfa.2015.09.058

Cited by 17 publications

(7 citation statements)

References 61 publications

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“…H 2 O is an environmentally friendly, inexpensive solvent and is available in large quantities. Additionally, the synthesis of metal nanoparticles, which often serve as the building blocks for metal gels, is well established in water [25][26][27][28][29][30][31]. Sporadic examples have shown that the metal aerogel synthesis is also possible in other solvents.…”

Section: Introductionmentioning

confidence: 99%

Expanding the Range: AuCu Metal Aerogels from H2O and EtOH

et al. 2022

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Due to their self-supporting and nanoparticulate structure, metal aerogels have emerged as excellent electrocatalysts, especially in the light of the shift to renewable energy cycles. While a large number of synthesis parameters have already been studied in depth, only superficial attention has been paid to the solvent. In order to investigate the influence of this parameter with respect to the gelation time, crystallinity, morphology, or porosity of metal gels, AuxCuy aerogels were prepared in water and ethanol. It was shown that although gelation in water leads to highly porous gels (60 m2g−1), a CuO phase forms during this process. The undesired oxide could be selectively removed using a post-washing step with formic acid. In contrast, the solvent change to EtOH led to a halving of the gelation time and the suppression of Cu oxidation. Thus, pure Cu aerogels were synthesized in addition to various bimetallic Au3X (X = Ni, Fe, Co) gels. The faster gelation, caused by the lower permittivity of EtOH, led to the formation of thicker gel strands, which resulted in a lower porosity of the AuxCuy aerogels. The advantage given by the solvent choice simplifies the preparation of metal aerogels and provides deeper knowledge about their gelation.

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Section: Introductionmentioning

confidence: 99%

Expanding the Range: AuCu Metal Aerogels from H2O and EtOH

et al. 2022

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“…Recently, a growing body of literature has extensively studied and evaluated several self-assembly approaches in SERS studies [ 8 , 9 , 10 ]. Currently, different techniques are being used to arrange self-assembled AgNPs over a large area, thanks to polymers [ 11 , 12 , 13 , 14 , 15 ], block copolymers [ 16 , 17 , 18 ], dendrimers [ 19 ], proteins [ 20 ], and deoxyribonucleic acid (DNA) molecules [ 21 , 22 ] acting as matrices for inducing ordering and anisotropic orientation on surfaces, and for controlling the number of constituent particles and their separation. [ 23 , 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

Self-Assembled Ag Nanocomposites into Ultra-Sensitive and Reproducible Large-Area SERS-Active Opaque Substrates

Fahes¹,

Naciri²,

Navvabpour

et al. 2021

Nanomaterials

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This work describes a novel, one-shot strategy to fabricate ultrasensitive SERS sensors based on silver/poly(methyl methacrylate) (PMMA) nanocomposites. Upon spin coating of a dispersion of PMMA and silver precursor on N-doped silicon substrate, closely separated silver nanoparticles were self-assembled into uniform nanospheres. As a result, a thin hydrophobic PMMA layer embedded with Ag nanoparticles (AgNPs) was obtained on the whole silicon substrate. Consequently, a large-scale, reproducible SERS platform was produced through a rapid, simple, low-cost, and high-throughput technology. In addition, reproducible SERS features and high SERS enhancement factors were determined (SEF ~1015). This finding matches the highest SEF reported in literature to date (1014) for silver aggregates. The potential and novelty of this synthesis is that no reducing agent or copolymer was used, nor was any preliminary functionalization of the surface carried out. In addition, the AgNPs were fabricated directly on the substrate’s surface; consequently, there was no need for polymer etching. Then, the synthetic method was successfully applied to prepare opaque SERS platforms. Opaque surfaces are needed in photonic devices because of the absence of secondary back reflection, which makes optical analysis and applications easier.

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“…In a more recent publication, Sakai et al [11] reported the synthesis of Ag-NPs in aqueous solutions of Pluronics (F88, F127, and F108) in the absence of any additional agents, with the disadvantage being the need for high synthesis temperatures (above 100°C). They observed that high concentration of Pluronics enhanced the reduction of Ag + , leading to the formation of Ag-NPs.…”

Section: Introductionmentioning

confidence: 99%

“…They observed that high concentration of Pluronics enhanced the reduction of Ag + , leading to the formation of Ag-NPs. Formation of spherical, plate-like and rod-like Ag-NPs was observed using TEM analysis [11]. Furthermore, Ag-NPs were synthesized by chemical reduction of silver nitrate (AgNO 3 ) employing dopamine as a reducing and sticking agent while Pluronic F127 was used as a stabilizer.…”

Section: Introductionmentioning

confidence: 99%

Use of Pluronic P103 Triblock Copolymer as Structural Agent during Synthesis of Hybrid Silver Nanoparticles

Tepale

Fernández-Escamilla

Flores-Aquino

et al. 2019

Journal of Nanomaterials

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Dilute aqueous solutions of triblock copolymer Pluronic P103 were used to synthesize silver nanoparticles (Ag-NPs) by chemical reduction of silver nitrate (AgNO3) with sodium borohydride (NaBH4). This copolymer was used as a structural agent since monomers act as a stabilizer and micelles act as nanoreactors for nucleation and growth of Ag-NPs. The growth of the nanoparticles (NPs) was monitored by UV-visible spectroscopy on the basis of measuring surface plasmon resonance absorption over a temperature range of 25 to 70°C. Shape and size of hybrid silver/P103 nanomaterials were tuned by varying the micellar structure of Pluronic P103 using a simple synthesis procedure. Dynamic Light Scattering (DLS) and Transmission Electron Microscopy (TEM) were used to study the size and shape of the hybrid nanomaterials. It was observed that Ag-NPs synthesized without Pluronic P103 at 25°C exhibited a great variety of sizes. However, when Pluronic P103 was used below its critical micellar concentration (CMC), spherical-shaped Ag-NPs with uniform size were formed, suggesting that the copolymer had a stabilizing effect. On the other hand, when Ag-NPs were prepared with Pluronic P103 above the CMC, NPs with similar sizes as the micelles were detected, suggesting that the copolymer functioned as a nanoreactor. Furthermore, as temperature reached 35°C, oval-shaped micelles were formed and small NPs were incorporated into the crown of the micelles. Independent Ag-NPs were not observed since they used the surface of the micelles as a soft template. Therefore, it was possible to obtain tiny Ag-NPs with homogeneous size.

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Block copolymer-mediated synthesis of silver nanoparticles from silver ions in aqueous media

Cited by 17 publications

References 61 publications

Expanding the Range: AuCu Metal Aerogels from H2O and EtOH

Expanding the Range: AuCu Metal Aerogels from H2O and EtOH

Self-Assembled Ag Nanocomposites into Ultra-Sensitive and Reproducible Large-Area SERS-Active Opaque Substrates

Use of Pluronic P103 Triblock Copolymer as Structural Agent during Synthesis of Hybrid Silver Nanoparticles

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