New insights into the formation mechanism of gold nanoparticles using dopamine as a reducing agent

Du, Sinan; Luo, Ying; Liao, Zhengfang; Zhang, Wei; Li, Xinhua; Liang, Tianyu; Zuo, Fang; Ding, Kan

doi:10.1016/j.jcis.2018.03.077

Cited by 57 publications

(27 citation statements)

References 57 publications

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“…This observation/uniformity was different from conventional photoreduction methods based on a photocatalytic semiconductor, such as TiO 2 , which generates anisotropic MNPs with large size distribution and uncontrollable morphology under UV irradiation . The reason for this phenomenon is not clear yet, but we assume that PDA might act as a capping agent to stabilize and confine the deposited Ag NPs, in addition to reducing metal cations …”

Section: Resultsmentioning

confidence: 73%

“…In addition to Ag + reduction, UV irradiation also displayed a significant acceleration effect to other types of secondary modification on PDA surfaces, such as Au 3+ reduction, and reactions of PDA with thiols and amines. Few reports have addressed Au 3+ reduction by PDA, while a long reaction time is required and poor Au NPs yields are commonly obtained. Our experiment confirmed this: as shown in Figure S7a (Supporting Information) after immersing PDA surface in HAuCl 4 solution (10 × 10 −3 m ) for 30 min, the PDA surface color was practically unchanged, and few Au NPs were observed in the SEM image, indicating the difficulty of Au 3+ spontaneous reduction by PDA.…”

Section: Resultsmentioning

confidence: 99%

“…This unique material, inspired by the versatile adhesive property of mussel foot, has drawn tremendous attention from both scientific research and industry fields . PDA reveals a material‐independent adhesion property, as well as reactivity to thiols, amines, and metal ions (Ag + , Au 3+ , and Cu 2+ ), allowing the secondary modification of these coatings with organic chains or metal nanoparticles (MNPs). Combining the two properties above, PDA coatings open up a new horizon to “functionalize almost any surface on demand,” thus fulfilling requirements from fields as varied as material science, chemistry, and biomedical science.…”

Section: Introductionmentioning

confidence: 99%

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UV‐Triggered Polydopamine Secondary Modification: Fast Deposition and Removal of Metal Nanoparticles

Zeng

Hou

et al. 2019

Adv Funct Materials

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Since the first report in 2007, polydopamine (PDA) coating has shown great potential as a general and versatile method to create functional nanocoatings on arbitrary substrates. Slow kinetics and poor controllability of the coating and secondary modification processes, however, have limited the further development of this attractive method. In this work, it is demonstrated that UV irradiation at 365 nm significantly accelerates the process of secondary modification of a PDA-coated surface. The kinetics of both thiol and amine modifications of PDA are increased 12-fold via UV irradiation, while the kinetics of metal ion reduction at the PDA interface is increased more than 550 times. Moreover, it is demonstrated that irradiating a PDA/metal nanoparticle composite surface with UV light at 254 nm leads to dissolution of the deposited metal nanoparticles (MNPs). Finally, grayscale metallic patterns, dynamic deposition, and removal of MNPs on PDA surface are realized with the proposed method.

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Section: Resultsmentioning

confidence: 73%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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UV‐Triggered Polydopamine Secondary Modification: Fast Deposition and Removal of Metal Nanoparticles

Zeng

Hou

et al. 2019

Adv Funct Materials

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“…In addition, increasing dopamine concentration resulted in the formation of larger metal particles. In a related study, the reduction of Au 3+ ions was explored in the presence of dopamine . The formation of gold nanoparticles was shown to start after the oxidation of dopamine to quinones.…”

Section: Catalyst Synthesismentioning

confidence: 99%

Polydopamine – its Prolific Use as Catalyst and Support Material

Molnár

2020

ChemCatChem

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Polydopamine is a mussel-inspired functional material with a unique ability to form surface coatings. It is a green, environmentally benign product available very easily for a multitude of varied applications. This review attempts to collect useful information with respect to polydopamine-based catalytic studies with the use of polydopamine and modified polydopamine preparations loaded with varied catalytically active species including metal ions and metal particles. Major sections are about the use of polydopamine as catalyst material, utilization of immobilized enzymes, removal of toxic materials, results in organic synthesis, and fuel cell applications. A few examples of chiral catalysis and results of recycling studies are also treated. Data collected and analyzed indicate the importance and high potential of polydopamine-based catalysts in sustainable chemistry. of subunits attacked by an immobilized cyclohexeneamine (5) was suggested to be the transition state of CÀ C bond formation.Edouard et al. prepared catalyst 0.29 % PDA/PU by depositing PDA onto polyurethane foam (PU, 180 � 20 mg, 8 cm 3 ) and used it for the reduction of methylene blue (MB) with NaBH 4 . [48] Activities decreased gradually with repeated uses from 100 % to 35 % in run 11 but partial reactivation was achieved upon keeping the sample at 67°C for 8 h (55 % dropping below 10 % in run 13). Exposure to air at room temperature for six days proved to be somewhat more beneficial (90 % conversion in run 14 decreasing to 48 % in run 18). In a recent study they fabricated two oxidized PDA/PU samples and then loaded them with NaBH 4 . [49] One made by the usual method (dopamine/Tris, rt, 12 h, in air; sample PDA O2 PU), whereas the other was made by treating PU in a mixture of dopamine, NaOAc, and NaIO 4 (pH 5, rt, 24 h). The sample was dried (67°C) and washed thoroughly with water (PDA NaIO4 PU). Both products were dipped into an aqueous solution of NaBH 4 (0.1 M, 10 min) to afford boron contents of 2.37 and 2.11 wt%. The catalysts tested in the degradation of MB showed high activities with efficiencies of 97 % and 98 %, respectively (NaBH 4 /MB molar ratio 40, 177 mg and 209 mg catalysts, 25 min). During five reuses, the pH of the reaction medium increased because of boron loss (0.78 wt% and 0.81 wt%). The activity of PDA NaIO4 PU decreased to 89 % in run five. However, dipping the used sample into a 0.1 M NaBH 4 solution restored the original efficiency of 98 %. This, however, was only a temporary remedy, since a low efficiency of 60 % was measured in run 10. PDA was suggested by the authors to act as a redox mediator to prevent the hydrolysis/oxidation of immobilized borohydride.This formula (5) should be moved up and placed before the paragraph starting with "Edouard et al…"The Zuo group used PDA particles (avg. diameter 240 nm) to induce the reduction of MB and rhodamine B (RhB) with NaBH 4 . [50] Quinone moieties of PDA were assumed to channel electrons from NaBH 4 to the dyes. Indeed, PDA oxidized with NaIO 4 exhibited increased degradatio...

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“…Since the Ag antibacterial nanocomposites are applied in human contacting areas, an environment friendly synthesis process is preferred and a final bio-compatible surface is of growing requirement. It is reported that many biocompatible polymers, especially the dopamine, can be utilized in synthesizing noble metal nanoparticles as both reducing agents and protection layer [ 15 ]. Interestingly, the dopamine can firmly adhere on diverse substrates via strong intermolecular interactions and final polydopamine (PDA) presents a meso-porous characteristic [ 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Polydopamine/Ag Shell-Encapsulated Magnetic Fe3O4 Nanosphere with High Antibacterial Activity

Fang

Zhang

et al. 2020

Materials

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The bacteria, which usually contaminate water environment, often cause terrible infectious diseases thus seriously threaten people’s health. To meet the increasing requirement of the public health care, an easily separable nanomaterial with sustainable anti-bacteria performance is required. This work reports a Fe3O4@PDA/Ag/PDA core-shell nanosphere in which the Ag nanocrystals immobilized on the magnetic carrier are protected by an external polydopamine (PDA) layer. The magnetic hybrid nanospheres are constructed by a tunable coating method and the particle parameters can be effectively controlled by the experimental condition. The antibacterial potential of the nanospheres is evaluable by using the Staphylococcus aureus and Escherichia coli as the models. The results indicate the Fe3O4@PDA/Ag/PDA core-shell nanospheres have a high antibacterial performance by measuring the minimum inhibitory concentration and the minimum bactericidal concentration. Finally, the product is expected to have a sustainable activity because the protecting PDA layer reduce the releasing rate of the Ag+ ions and the materials can be magnetically recovered from the media after the disinfection procedure.

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New insights into the formation mechanism of gold nanoparticles using dopamine as a reducing agent

Cited by 57 publications

References 57 publications

UV‐Triggered Polydopamine Secondary Modification: Fast Deposition and Removal of Metal Nanoparticles

UV‐Triggered Polydopamine Secondary Modification: Fast Deposition and Removal of Metal Nanoparticles

Polydopamine – its Prolific Use as Catalyst and Support Material

Hybrid Polydopamine/Ag Shell-Encapsulated Magnetic Fe3O4 Nanosphere with High Antibacterial Activity

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