Understanding the Effect of Iodide Ions on the Morphology of Gold Nanorods

Amini, Mozhgan N.; Altantzis, Thomas; Lobato, Iván; Grzelczak, Marek; Sánchez‐Iglesias, Ana; Aert, Sandra Van; Liz‐Marzán, Luis M.; Partoens, B.; Neyts, Erik C.

doi:10.1002/ppsc.201800051

Cited by 6 publications

(3 citation statements)

References 25 publications

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“…46 Iodide Role. An important aspect of this synthetic approach to producing AuNPRs is that iodide serves not only as a shapeselective ligand, as was previously established, 25,34,47 but also as a redox mediator. The redox-mediating role arises from the generation of triiodide as a product of the reduction of the gold precursor with iodide (eq 1).…”

Section: ■ Results and Discussionmentioning

confidence: 92%

Gold Nanoprisms: Synthetic Approaches for Mastering Plasmonic Properties and Implications for Biomedical Applications

Stangherlin

Cathcart

Sato

et al. 2020

ACS Appl. Nano Mater.

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In a comprehensive approach to the preparation of gold nanoprisms (AuNPRs), we first discuss three developed synthetic strategies to produce 2D planar-twinned morphologies with plasmonic control for practical applications. The developed synthetic procedures do not employ cytotoxic reagents, e.g., cetyltrimethylammonium bromide, and no shape purification is required. The primary synthesis of AuNPRs is based on iodide (or triiodide) redox mediation that enables shape selection with >99% yield. Another synthetic route involves low pH using citric acid, where 2D growth is achieved via redox equilibrium with an excess of the precursor. In a related approach, reduction with hydrogen peroxide in the presence of thiols and halides to slow the growth at the AuNPR surface enables the most efficient preparation of AuNPRs (<15 min). The main synthetic emphasis was placed on tuning of the localized surface plasmon resonance (LSPR) peaks of AuNPRs in a wide range from 540 to 1000+ nm. Having developed several synthetic procedures, we discuss important factors including crucial delays in reagent addition and the role of impurities, such as silver ions, that are disruptive for AuNPR formation even at submicromolar concentrations. On the basis of this knowledge and practical developments, general guidelines for the kinetic growth of AuNPRs are formulated to offer the synthetic protocols that are versatile and reproducible and can be readily scaled. Consequently, the developed synthetic approaches and a general understanding of the formation of AuNPRs with tunable LSPR will benefit a diverse range of researchers working with plasmonic metal nanoparticles, especially in the area of biomedical applications.

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Section: ■ Results and Discussionmentioning

confidence: 92%

Gold Nanoprisms: Synthetic Approaches for Mastering Plasmonic Properties and Implications for Biomedical Applications

Stangherlin

Cathcart

Sato

et al. 2020

ACS Appl. Nano Mater.

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“…However, high concentration I − in turn deteriorated the anisotropic evolution of the seeds, as evidenced by the shorter LSPR wavelengths (figure S4). Besides the {111} facets, the excess I − adsorbed on the entire surface of the Au nanotriangles [39]. Moreover, the excess iodide ions even caused fusion of the AuTNP tips [40].…”

Section: Optimization Of the Detection Conditionsmentioning

confidence: 99%

Label-free, sensitive colorimetric detection of mercury(II) by target-disturbed in situ seeding growth of gold triangular nanoprisms

et al. 2020

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Gold nanomaterials have been used extensively in colorimetric detection of mercuric ions (Hg 2+ ) due to their shape-and size-dependent, ultrastrong localized surface plasmon resonance (LSPR). Conventional detection was performed by first synthesizing the nanomaterials, and then applying them to signal-transducing reactions. We herein report a convenient method for detecting Hg 2+ based on gold triangular nanoprisms (AuTNPs). During the seeding-growth process, Hg 2+ added to the growth solution was co-reduced and deposited on the high-energy facets of the gold seeds, affecting the deposition patterns of the subsequently generated Au 0 and ultimately leading to the formation of defective AuTNPs. Morphological changes were reflected by the in-plane dipole LSPR wavelength shift, which was proportionally related to the concentration of Hg 2+ . To improve the selectivity, the interference from Ag + was eliminated by a stepwise preparation-selective precipitation approach. Under the optimized conditions, Hg 2+ could be selectively detected with 20 min, with a detection limit of 0.12 nM. Finally, the method was successfully applied to detecting trace Hg 2+ in fortified drinking, mineral and rain water samples, with recoveries ranging from 95.17% to 110.6%.

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“…A gold nanorod (Au NR) sample was imaged using an aberration‐corrected cubed FEI‐Titan electron microscope operating in HAADF‐STEM mode at 300 kV. The Au NR forms an ideal test sample since it is stable under the electron beam and its morphology does not alter during a tomography experiment . The relevant acquisition parameters and the abbreviations of the different dose limiting techniques are summarized in Table 1 .…”

Section: Acquisition and Reconstructionmentioning

confidence: 99%

Experimental Evaluation of Undersampling Schemes for Electron Tomography of Nanoparticles

Vanrompay

Béché

Verbeeck

et al. 2019

Part & Part Syst Charact

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One of the emerging challenges in the field of 3D characterization of nanoparticles by electron tomography is to avoid degradation and deformation of the samples during the acquisition of a tilt series. In order to reduce the required electron dose, various undersampling approaches have been proposed. These methods include lowering the number of 2D projection images, reducing the probe current during the acquisition, and scanning a smaller number of pixels in the 2D images. A comparison is made between these approaches based on tilt series acquired for a gold nanoparticle.

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Understanding the Effect of Iodide Ions on the Morphology of Gold Nanorods

Cited by 6 publications

References 25 publications

Gold Nanoprisms: Synthetic Approaches for Mastering Plasmonic Properties and Implications for Biomedical Applications

Gold Nanoprisms: Synthetic Approaches for Mastering Plasmonic Properties and Implications for Biomedical Applications

Label-free, sensitive colorimetric detection of mercury(II) by target-disturbed in situ seeding growth of gold triangular nanoprisms

Experimental Evaluation of Undersampling Schemes for Electron Tomography of Nanoparticles

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