Kinetically controlled seed-mediated growth of narrow dispersed silver nanoparticles up to 120 nm: secondary nucleation, size focusing, and Ostwald ripening

Zong, Ruilong; Wang, Xiaolong; Shi, Shikao; Zhu, Yongfa

doi:10.1039/c3cp54846e

Cited by 56 publications

(57 citation statements)

References 37 publications

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“…Continuous growth of larger nanoparticles indicate that the reaction is maintained under the diffusion-controlled condition, with silver ion concentration below the supersaturation point. 25 The data also show that decreasing the seed concentration allows for a larger quantity of silver ions to be incorporated into each particle under these reaction conditions (Figure 4c). Further increase in silver ion concentration could lead to supersaturation, which is associated with secondary nucleation rather than the diffusion-controlled growth of nanoprisms.…”

Section: Resultsmentioning

confidence: 77%

“…This metric, peak-fwhm, has been previously evaluated and applied to characterization of dispersity of silver nanoparticles. 25 The narrowest peak-fwhm (~80 nm) occurred for small nanoprisms (~30 nm edge length) at all TSC concentrations. As expected, peak-fwhm increased faster with prism size for lower TSC concentrations, indicating more variation in particle morphologies under these conditions.…”

Section: Resultsmentioning

confidence: 91%

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Synthesis of Stable Citrate-Capped Silver Nanoprisms

Haber

Sokolov

2017

Langmuir

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Citrate-stabilized silver nanoprisms (AgNPrs) can be easily functionalized using well-developed thiol based surface chemistry that is an important requirement for biosensor applications utilizing localized surface plasmon resonance (LSPR) and surface-enhanced Raman Scattering (SERS). Unfortunately, currently available protocols for synthesis of citrate-coated AgNPrs do not produce stable nanoparticles thus limiting their usefulness in biosensing applications. Here we address this problem by carrying out a systematic study of citrate-stabilized, peroxide-based synthesis of AgNPrs to optimize reaction conditions for production of stable and reproducible nanoprisms. Our analysis showed that concentration of secondary reducing agent, l-ascorbic acid, is critical to AgNPr stability. Furthermore, we demonstrated that optimization of other synthesis conditions such as stabilizer concentration, rate of silver nitrate addition, and seed dilution result in highly stable nanoprisms with narrow absorbance peaks ranging from 450 nm into near-IR. In addition, the optimized reaction conditions can be used to produce AgNPrs in a one-pot synthesis instead of a previously described two-step reaction. The resulting nanoprisms can readily interact with thiols for easy surface functionalization. These studies provide an optimized set of parameters for precise control of citrate stabilized AgNPr synthesis for biomedical applications.

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Section: Resultsmentioning

confidence: 77%

Section: Resultsmentioning

confidence: 91%

Synthesis of Stable Citrate-Capped Silver Nanoprisms

Haber

Sokolov

2017

Langmuir

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“…The success of this approach depends on the simultaneous compliance of a number of factors, mainly the formation of seeds with narrow size distributions and the use of different reducing agents in the seed and growth reactors to ensure the separation of both steps. The seed-mediated growth system has been previously reported in both flow and batch synthesis 19 however, it is normally carried out in multiple steps in the presence of organic stabilising ligands while in this work, only citrate stabilised seeds are used. Firstly, the final size distribution strongly depends on obtaining a narrow size distribution in the nucleation reactor 1 as well as ensuring continuous undisrupted laminar flow across the system to avoid random agglomeration of the particles.…”

Section: View Article Onlinementioning

confidence: 99%

Continuous synthesis of tuneable sized silver nanoparticles via a tandem seed-mediated method in coiled flow inverter reactors

Torrente‐Murciano

2018

React. Chem. Eng.

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Continuous synthesis of tuneable sized silver nanoparticles via a tandem seed-mediated method in coiled fl ow inverter reactorsThe continuous synthesis of metal nanoparticles with tuneable sizes in the absence of organic capping ligands is presented. 3D microreactors connected in series enable the separation of the nucleation and growth steps during the synthesis of silver nanoparticles. The coiled fl ow inverted reactor confi guration promotes the rotation of the fl uid, limiting the agglomeration of the particles, and leading to narrow size distributions. As featured in:See Ke-Jun Wu and Laura Torrente-Murciano, React. Chem. Eng., 2018, 3, 267.rsc.li/reaction-engineering Reaction Chemistry & Engineering flow. We also demonstrate that careful control of the nature of the reducing agents in each step is essential to avoid secondary nucleation and ensure narrow size distributions. This innovative new capability will not only provide fundamental understanding of the effect of the size of nanoparticles in a number of applications but also enable the deployment of large-scale well-defined nanoparticles for commercial uses.

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“…Rapid mixing and simultaneous nanoreactor self-assembly thus prevents secondary nucleation and Ostwald ripening allowing for kinetically controlled growth and size focusing of encapsulated gold nanoparticles of uniform size [32][33][34] .…”

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confidence: 99%

Efficient preparation of size tunable PEGylated gold nanoparticles

et al. 2016

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A facile, one-step self-assembly of polymer nanoreactors is reported for the fabrication of uniform PEGylated gold nanoparticles. Nanoreactor assembly occurs within milliseconds and gold nanoparticles are produced within minutes at room temperature. The presented approach enables continuous synthesis of size tunable gold nanoparticles with tailorable surface chemistry. Figure 2. (a) Initial nanoreactor size distributions measured by DLS and (b) UV absorbance of the dialyzed dispersions synthesized at a range of pHs by diluting the effluent from the mixer into PBS, pH 7.4, water (MQ) or 0.01M HCl.The nanoreactor assembly occurs on the order of milliseconds (time scale of mixing). The reduction to Au(0) occurs in the nanoreactor where TA is localized. The reduction is evident by the transition from the light amber dispersion to strongly red or purple colored dispersions associated with colloidal gold (Fig. 2, Supporting Information Figure S2) that occurs within ~20 seconds (at pH 6) to ~7 minutes (pH 2). The effect of pH on the rate of reduction has been used to tune nanoparticle size over a relatively narrow range 17-20 nm 20 . We demonstrate this strategy

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Kinetically controlled seed-mediated growth of narrow dispersed silver nanoparticles up to 120 nm: secondary nucleation, size focusing, and Ostwald ripening

Cited by 56 publications

References 37 publications

Synthesis of Stable Citrate-Capped Silver Nanoprisms

Synthesis of Stable Citrate-Capped Silver Nanoprisms

Continuous synthesis of tuneable sized silver nanoparticles via a tandem seed-mediated method in coiled flow inverter reactors

Efficient preparation of size tunable PEGylated gold nanoparticles

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