Facile synthesis of hollow urchin-like gold nanoparticles and their catalytic activity

Wang, Wei; Pang, Yujia; Yan, Jian; Wang, Guibao; Suo, Hui; Zhao, Chun; Xing, Shuangxi

doi:10.1007/s13404-012-0052-y

Cited by 35 publications

(29 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…More specifically, we focused on the Ag 56 Au 28 Pd 16 , Ag 78 Au 9 Pt 13 , and Ag 71 Pd 16 Pt 13 compositions for nanoshells containing Ag, Au, and Pd; Ag, Au, and Pt; and Ag, Pd, and Pt, respectively. Consequently, we also studied on their bimetallic counterparts: Ag 72 Au 28 and Ag 84 Pd 16 ; Ag 91 Au 9 and Ag 87 Pt 13 ; and Ag 84 Pd 16 and Ag 87 Pt 13 , respectively. Figure 3a-c display TEM images for Ag 56 Au 28 Pd 16 , Ag 78 Au 9 Pt 13 , and Ag 71 Pd 16 Pt 13 trimetallic nanoshells, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 4a-f shows TEM images for the bimetallic nanoshells counterparts: Ag 72 Au 28 (Fig. 4a), Ag 84 Pd 16 (Fig. 4b), Ag 91 Au 9 (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…While bimetallic compositions allow for the combination and/or synergism of catalytic properties between the metal components, their hollow interiors provide higher surface-to-volume ratios relative to their solid analogs [4,[8][9][10][11][12][13]. In this context, several investigations on the catalytic activities of bimetallic and hollow nanostructures containing gold (Au), palladium (Pd), and platinum (Pt) have been demonstrated [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Probing the catalytic activity of bimetallic versus trimetallic nanoshells

et al. 2015

View full text Add to dashboard Cite

The synthesis of trimetallic nanoparticles represents an emerging strategy to maximize catalytic performances in noble metal-based catalysts. However, the controllable synthesis of trimetallic nanomaterials as well as the exact role played by the addition of a third metal in their composition over catalytic performances remains unclear. In this paper, we describe the synthesis of trimetallic nanoshells having AgAuPd, AgAuPt, and AgPdPt compositions by a sequential galvanic replacement reaction approach between Ag nanospheres as sacrificial templates and the corresponding metal precursors, i.e., AuCl 4 -(aq) , PdCl 4 2-(aq) , and/or PtCl 6 2-(aq) . In each of these systems, the composition could be systematically tuned by varying the molar ratios between Ag and each metal precursor. Nanoshells having Ag 56 Au 28 Pd 16 , Ag 78 Au 9 Pt 13 , and Ag 71 Pd 16 Pt 13 compositions were employed as model systems to investigate the effect of the addition of the third metal in their composition over the catalytic activities toward the 4-nitrophenol reduction. Our data demonstrate a significant enhancement in conversion percentages and thus the catalytic activities relative to the sum of their bimetallic counterparts, and this increase was dependent on the nature of the metals, corresponding to 826, 135, and 56 % for Ag 56 Au 28 Pd 16 , Ag 78 Au 9 Pt 13 , and Ag 71 Pd 16 Pt 13 nanoshells relative to their bimetallic analogs. The results presented herein demonstrate the strong correlation between catalytic activity and composition in multimetallic nanoshells, and that the incorporation of a third metal may represent a promising approach to boost catalytic activities for a variety of transformations.

show abstract

Section: Resultsmentioning

confidence: 99%

“…Figure 4a-f shows TEM images for the bimetallic nanoshells counterparts: Ag 72 Au 28 (Fig. 4a), Ag 84 Pd 16 (Fig. 4b), Ag 91 Au 9 (Fig.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Probing the catalytic activity of bimetallic versus trimetallic nanoshells

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Numerous studies have proposed strategies to construct or transform metal nanoparticles into diverse nanostructures (including prisms, disks, rods, and core-shells) that can tune the absorption properties [10][11][12][13][14]. In particular, the preparation of metal-metal core-shell nanoparticles possessing desired optical and electrical properties with a biocompatible nature have been extensively studied by the subsequent chemical reduction method using two or more metal ions [9,13,[15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…The absorption wavelengths of these "core-shell type bimetallic nanoparticles" can be systematically tuned from the visible to the near-IR region by adjusting the molar ratio of the initial reagents. Importantly, these bimetallic nanoparticles are reliably prepared and can be modified further with substantially greater ease and more anisotropic shapes than the related gold-coated dielectric or metallic nanoshells/nanocubes [11,13,14,20,[27][28][29]. Upon the formation of various bimetallic nanoparticles possessing a strong and broad absorption band, these nanoparticles may serve as interesting materials in the area of optically tunable devices, SERS enhancers, and biomedical applications [15,[30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

One-pot synthesis of various Ag–Au bimetallic nanoparticles with tunable absorption properties at room temperature

2013

View full text Add to dashboard Cite

This report describes the formation of gold-coated silver bimetallic nanoparticles prepared by the one-pot synthetic approach which involves the subsequent reduction of silver and gold ions at ambient conditions. The reduction of silver ions by excess L-ascorbic acid initially led to the formation of silver cores. This step was followed by the addition of gold ions into the preformed cores, resulting in the formation of silver-core gold-shell type bimetallic nanoparticles at room temperature. This process systematically allowed for the formation of various bimetallic nanoparticles which exhibited tunable absorption properties corresponding to the visible and near-IR regions. The thickness of the gold shells and the diameter of the silver-core nanoparticles were readily controlled; the morphological and structural properties of the resulting bimetallic nanoparticles were thoroughly analyzed by SEM/TEM, DLS, and UV-Vis spectrophotometry. The overall results demonstrated not only that these gold-coated silver nanoparticles were reliably prepared by our one-pot synthetic approach, but also that their optical properties were tunable in the visible and near-IR areas as a function of the core size and shell thickness.

show abstract

A Simple, Efficient and Ultrasensitive Gold Nanourchin Based Electrochemical Sensor for the Determination of an Antimalarial Drug: Mefloquine

et al. 2017

View full text Add to dashboard Cite

Mefloquine (MQ) is a quinoline based antimalarial drug, which is potent against multiple drug‐resistant Plasmodium falciparum. It is widely prescribed for the prophylactic treatment of malaria. Due to extensive usage of MQ, constant monitoring of the drug level in human body is of paramount importancein order to ensure that optimum drug exposure is achieved. The present work describes a gold nanourchins (AuNUs) based electrochemical sensor for the determination of MQ.AuNUs were synthesized via seed‐mediated method and characterized using ultraviolet‐visible spectroscopy, energy‐dispersive X‐ray spectroscopy, field emission scanning electron microscopy, zeta‐sizer and electrochemical techniques (electrochemical impedance spectroscopy and cyclic voltammetry). Fabrication of the sensor was done by drop‐coating the synthesized AuNUs onto a glassy carbon electrode. The fabricated sensor exhibited enhanced voltammetric response, which was attributed to the excellent conductivity and high surface area of AuNUs. Under optimum square wave voltammetric conditions, the sensor displayed two linear response ranges (from 2.0×10−9 to 1.0×10−6 M and from 1.0×10−6 to 1.0×10−3 M) with a detection limit of 1.4 nM. The electrode demonstrated good reproducibility, stability and selectivity over common interferents. The utility of the sensor was successfully assessed for quantification of the drug in pharmaceutical preparation and spiked human urine sample. Thus, the present study demonstrates a promising approach for determination of MQ with practical utility in quality control and clinical analysis.

show abstract

Facile synthesis of hollow urchin-like gold nanoparticles and their catalytic activity

Cited by 35 publications

References 37 publications

Probing the catalytic activity of bimetallic versus trimetallic nanoshells

Probing the catalytic activity of bimetallic versus trimetallic nanoshells

One-pot synthesis of various Ag–Au bimetallic nanoparticles with tunable absorption properties at room temperature

A Simple, Efficient and Ultrasensitive Gold Nanourchin Based Electrochemical Sensor for the Determination of an Antimalarial Drug: Mefloquine

Contact Info

Product

Resources

About