Shape-controlled synthesis of silver nanoparticles: Ab initio study of preferential surface coordination with citric acid

Kilin, Dmitri S.; Prezhdo, Oleg V.; Xia, Younan

doi:10.1016/j.cplett.2008.04.046

Cited by 207 publications

(170 citation statements)

References 51 publications

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“…Many studies reported that spherical AgNPs show maximum absorbance between 400 nm to 450 nm. The intensity and peak position due to SPR are related with size, morphology and dielectric properties of synthesized nanoparticles [25,26]. Slow decrease in absorbance after peak indicated the polydispersed behavior of AgNPs in solution [27,28].…”

Section: Discussionmentioning

confidence: 99%

Green Synthesis, Characterization and Antibacterial Activity of Silver Nanoparticles of Endophytic Fungi Aspergillus terreus

Rani¹,

Sharma²,

Chaturvedi³

et al. 2017

J Nanomed Nanotechnol

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Section: Discussionmentioning

confidence: 99%

Green Synthesis, Characterization and Antibacterial Activity of Silver Nanoparticles of Endophytic Fungi Aspergillus terreus

Rani¹,

Sharma²,

Chaturvedi³

et al. 2017

J Nanomed Nanotechnol

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“…Citrate ions are widely utilized in the wet chemical synthesis of silver [3][4][5][6][7][8][9][10][11][12][13][14], gold [15][16][17][18][19][20][21], platinum [22] and other nanoparticles, acting as reducing (direct reduction of aqueous Ag + ions by citrate occurs under boiling or hydrothermal conditions [9][10][11][12][13]), complexing, and stabilizing agent, although the precise mechanisms are far from being fully understood. Сitrate is a key reagent for the preparation of silver nanoplates, cubes, disks, etc., as the selective adsorption of citrate on Ag (111) facets impedes their growth and promotes the yield of anisotropic particles [12,[23][24][25]. Transformation of rounded AgNPs to anisotropic ones under illumination [26][27][28] is believed to be due to decomposition of the citrate capping.…”

Section: Introductionmentioning

confidence: 99%

On the nature of citrate-derived surface species on Ag nanoparticles: Insights from X-ray photoelectron spectroscopy

Mikhlin

Vorobyev

Сайкова

et al. 2018

Applied Surface Science

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Citrate is an important stabilizing, reducing, and complexing reagent in the wet chemical synthesis of nanoparticles of silver and other metals, however, the exact nature of adsorbates, and its mechanism of action are still uncertain. Here, we applied X-ray photoelectron spectroscopy, soft X-ray absorption near-edge spectroscopy, and other techniques in order to determine the surface composition and to specify the citrate-related species at Ag nanoparticles 3 immobilized from the dense hydrosol prepared using room-temperature reduction of aqueous Ag + ions with ferrous ions and citrate as stabilizer (Carey Lea method). It was found that, contrary to the common view, the species adsorbed on the Ag nanoparticles are, in large part, products of citrate decomposition comprising an alcohol group and one or two carboxylate bound to the surface Ag, and minor unbound carboxylate group; these may also be mixtures of citrate with lower molecular weight anions. No ketone groups were specified, and very minor surface Ag(I) and Fe (mainly, ferric oxyhydroxides) species were detected. Moreover, the adsorbates were different at AgNPs having various size and shape. The relation between the capping and the particle growth, colloidal stability of the high-concentration sol and properties of AgNPs is briefly considered.

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“…Assuming all the adjacent C6 primary hydroxyls exposed on the surface were carboxylated, these spacings between CNF surface C6s are much greater than that between the dicarboxylic acid groups in sodium citrate (2.72−2.98 Å). 45 Figure 4c). In the latter case, the decrease in λ max at 80 μL of H 2 O 2 is due to reduced AgNP sizes from etching, again confirmed by TEM (Supporting Information, Figure S3).…”

Section: ■ Results and Discussionmentioning

confidence: 96%

“…In fact, AgNPs could not be formed by replacing trisodium citrate with other carboxylate-containing molecules under photochemical reduction, 31 except for some diacids and triacids with the nearest carboxylate groups separated by two carbons under H 2 O 2 aided reduction. 39 It is widely accepted that trisodium citrate binds to the [111] facets of Ag nanoparticles to inhibit the growth along that axis, while permitting growth on the [100] facets 36,45 and such binding passivates Ag nanoparticle by reducing free energy, stabilizing against H 2 O 2 etching, while allowing unpassivated Ag nanoparticles to be oxidized. 39,42 Both sulfuric acid hydrolyzed cellulose nanocrystals (CNCs) and 2,2,6,6-tetramethylpyperidine-1-oxyl (TEMPO) oxidized cellulose nanofibrils (CNFs) have shown to serve as capping agents in the synthesis of spherical Ag nanoparticles.…”

Section: ■ Introductionmentioning

confidence: 99%

Synthesis of Cellulose Nanofibril Bound Silver Nanoprism for Surface Enhanced Raman Scattering

Jiang

Hsieh

2014

Biomacromolecules

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Silver nanoprisms (AgNPs) were robustly synthesized using TEMPO-oxidized cellulose nanofibrils (CNFs) as a dual capping and shape-regulating agent for the first time. Reducing AgNO 3 with NaBH 4 in CNF suspensions produced smaller but more uniform Ag nanospheres (AgNSs) with increasing Ag + /CNF ratios. CNF bound AgNSs were facilely transformed to AgNPs by etching with H 2 O 2 , supporting the capping and shape-regulating capability of CNFs. AgNPs could also be synthesized directly in a one-shot reduction reaction with NaBH 4 in the presence of both CNFs and H 2 O 2 . The AgNPs transformed from CNF bound AgNSs are similar to those synthesized directly, but more stable against H 2 O 2 . Successful synthesis of AgNPs with 80−320 nm truncated edges was confirmed by light blue solution color, sharp out-of-plane quadruple resonance peak at 334 nm and prominent in-plane dipole resonance peaks at 762−900 nm. The [111] lattice plane of AgNP was clearly evident by its predominant XRD peak at 38°, confirming the unique shape-regulating ability of the nearly fully surface carboxylated CNFs. The CNF surface bound AgNPs were easily fabricated into freestanding CNF/AgNPs films that showed excellent surface enhanced Raman scattering of Rhodamine 6G with analytical enhancement factor of 5 × 10 3 in contrast to none from the CNF/AgNSs film.

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Shape-controlled synthesis of silver nanoparticles: Ab initio study of preferential surface coordination with citric acid

Cited by 207 publications

References 51 publications

Green Synthesis, Characterization and Antibacterial Activity of Silver Nanoparticles of Endophytic Fungi Aspergillus terreus

Green Synthesis, Characterization and Antibacterial Activity of Silver Nanoparticles of Endophytic Fungi Aspergillus terreus

On the nature of citrate-derived surface species on Ag nanoparticles: Insights from X-ray photoelectron spectroscopy

Synthesis of Cellulose Nanofibril Bound Silver Nanoprism for Surface Enhanced Raman Scattering

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