Plasmon mediated shape and size selective synthesis of icosahedral silver nanoparticles via oxidative etching and their 1-D transformation to pentagonal pins

Keunen, Rachel; Cathcart, Nicole; Kitaev, Vladimir

doi:10.1039/c4nr01477d

Cited by 31 publications

(36 citation statements)

References 51 publications

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“…From the analysis of TEM and SEM images, more than 90 % of the products were icosahedral AgNPs with sizes of 80 to 150 nm. To the best of our knowledge, this is the first time that AgNPs with I h symmetry have been synthesized (in the absence of AuNP seeds or AgNP seeds) by using a seed‐free photochemical method . In contrast, the shapes of products are relatively divergent (rods, plates, decahedra, and icosahedra) when using the plasmon‐mediated photochemical method with either citrate or tartrate as the reduction agent under irradiation with the same light source.…”

Section: Introductionmentioning

confidence: 87%

One‐Pot Synthesis of Icosahedral Silver Nanoparticles by Using a Photoassisted Tartrate Reduction Method under UV Light with a Wavelength of 310 nm

2016

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A photoassisted citrate reduction reaction under blue LEDs is an easy and highly reproducible method to synthesize high-yield decahedral silver nanoparticles (AgNPs) in the absence of seeds in the initial photochemical reaction. In this study, icosahedral AgNPs with sizes of 80 to 150 nm could be synthesized by using the photoassisted tartrate reduction method under UV light with a wavelength of λ=(310±12) nm. The product yield of icosahedral AgNPs is higher than 90 %. SAED (selected-area electron diffraction) patterns and XRD (X-ray diffraction) spectra show that these AgNPs have multiply twinned structures. High-resolution TEM and dark-field TEM show that the facet of the triangular planes of these icosahedral AgNPs is {111}. This is the first report of icosahedral AgNPs synthesized by using a seed-free photochemical method. SERS (surface-enhanced Raman scattering) of Crystal Violet (CV) measurements show that the as-prepared icosahedral AgNP colloids have excellent SERS enhancement factors, which are approximately four and six times the enhancement factors of decahedral AgNP colloids and thermal-citrate-reduction AgNP colloids, respectively.

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Section: Introductionmentioning

confidence: 87%

One‐Pot Synthesis of Icosahedral Silver Nanoparticles by Using a Photoassisted Tartrate Reduction Method under UV Light with a Wavelength of 310 nm

2016

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“…So far, lots of protocols including seeded growth, template, selective etching (galvanic etching or others) have been widely used. [35][36][37][38][39][40][41][42][43] Generally, noble nanostructures are coated by different facets which are not equal energetically. Seeded growth typically includes the formation of seeds and subsequent epitaxial growth on seeds surface, which allows tuning shape, size and composition and in turn products properties.…”

Section: Introductionmentioning

confidence: 99%

“…[26][27][28][29][30][31][32][33][34] Selective etching always follows energy-driven rule. [35][36][37][38][39][40][41][42][43][44] In some cases, the combination of two advanced methods allows preparing relatively more complex and special nanostructures which cannot be achieved with only one method. Positions with high surface free energy are preferentially etched because the atoms here are active and attract etchant molecules strongly.…”

Section: Introductionmentioning

confidence: 99%

The alloying effect and AgCl-directing growth for synthesizing a trimetallic nanoring with improved SERS

Han

Zhou

et al. 2015

Nanoscale

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We report the synthesis of high quality trimetallic Au/Ag/Pt nanorings (TAAPNs) by using Au/Ag alloy decahedra (AAAD) as templates. The alloying effect and AgCl-directing growth have been investigated in detail during the formation of TAAPN. It was found that the doping of Ag in AAAD changes the surrounding environment of Au atoms and decreases the oxidization reduction potential (ORP) of [AuCl(2)](-)/Au because of the alloying effect, resulting in the dissolved O(2) molecules that serve as an effective etchant for oxidizing Au to Au(I). Ascorbic acid (AA) and chloroplatinic acid (H(2)PtCl(6)) are weak acids which can accelerate the etching by increasing the concentration of H(+). The AgCl selectively absorbs on {100} of the decahedra and induces the preferential deposition of H(2)PtCl(6) here via their complexing interaction. AA reduces Pt(IV) and Ag(I) to atoms which grow on {100} facets. The formed Pt/Ag layer changes the etching direction from along [100] to [111] and generates the TAAPN. Besides, it has been noted that the TAAPNs exhibit good Surface Enhanced Raman Scattering (SERS) performance.

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“…The reaction was conducted at 120 °C for 12 h. Again, the samples were plagued by low purity and broad size distribution . As one of the most successful protocols, Kitaev and co‐workers reported the synthesis of Ag icosahedral nanocrystals using a photochemical method and an aqueous system containing AgNO 3 , NaBH 4 , H 2 O 2 , sodium citrate, and cupric ions . The solution was irradiated with a violet LED light source (401–410 nm) for 20 h to promote plasmonic selection of the Ag icosahedral nanocrystals with a narrow size distribution.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Silver Icosahedral Nanocrystals with Uniform and Controllable Sizes

et al. 2018

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We report a robust route to the one‐pot synthesis of Ag icosahedral nanocrystals with uniform and controllable sizes. Our results indicate that multiply‐twinned seeds are initially formed via homogeneous nucleation, followed by their growth into icosahedral nanocrystals with enlarged sizes. During the growth process, Ostwald ripening plays a key role in enabling the formation of nanocrystals with a narrow size distribution. In addition to the conventional approach involving the variation of reaction time, we are able to control the size of the icosahedral nanocrystals by adjusting the molar ratio of the Ag(I) precursor to the reducing agent, altering the reaction temperature, and/or introducing additional Ag(I) precursor. The Ag icosahedral nanocrystals embrace strong localized surface plasmon resonance, with a tunable peak position depending on the particle size. We believe the availability of Ag icosahedral nanocrystals with uniform, tunable sizes offers a great opportunity to investigate their plasmonic and catalytic properties, as well as related applications.

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Plasmon mediated shape and size selective synthesis of icosahedral silver nanoparticles via oxidative etching and their 1-D transformation to pentagonal pins

Cited by 31 publications

References 51 publications

One‐Pot Synthesis of Icosahedral Silver Nanoparticles by Using a Photoassisted Tartrate Reduction Method under UV Light with a Wavelength of 310 nm

One‐Pot Synthesis of Icosahedral Silver Nanoparticles by Using a Photoassisted Tartrate Reduction Method under UV Light with a Wavelength of 310 nm

The alloying effect and AgCl-directing growth for synthesizing a trimetallic nanoring with improved SERS

Facile Synthesis of Silver Icosahedral Nanocrystals with Uniform and Controllable Sizes

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