Beyond platinum: silver-catalyst based bubble-propelled tubular micromotors

Teo, Wei Zhe; Hong, Wang; Pumera, Martin

doi:10.1039/c6cc00115g

Cited by 68 publications

(63 citation statements)

References 41 publications

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“…We argue that the direct reaction between H 2 O 2 and H 2 A is very slow in the reaction solution and therefore could be negligible in the timescale of the synthesis (Figure S2, Supporting Information). On the contrary, the decomposition of H 2 O 2 is highly accelerated on the Ag surface, leading to the oxidation of Ag and, thus, to its efficient chemical etching (2 Ag+H 2 O 2 →Ag 2 O+H 2 O). Meanwhile, part of the Ag + species would be again reduced to elemental Ag by H 2 A, leading to the regrowth of Ag (H 2 A+Ag 2 O→H 2 O+2 Ag+DHA; DHA: dehydroascorbic acid).…”

Section: Resultsmentioning

confidence: 99%

“…[44,45] Here, as imilar combination of H 2 O 2 and H 2 Ap rovedt ob es uccessfuli np roducing hollow Ag NSs with excellent controllability.W ea rgue that the direct reaction between H 2 O 2 and H 2 Ai s very slow in the reactionsolution and therefore could be negligible in the timescale of the synthesis ( Figure S2, Supporting Information). On the contrary,t he decomposition of H 2 O 2 is highly accelerated on the Ag surface, [46,47] leading to the oxidation of Ag and, thus, to its efficient chemical etching( 2Ag+ Figure S5 in the Supporting Information); therefore, these nanospheresc an be regarded as "hollow Ag NSs", with their chemical and optical properties resembling those of the pure Ag particles. The EDS elemental mapping was carried out to reveal the distributions of both metalsi n the hollow nanospheres( Figure 1d).…”

Section: Resultsmentioning

confidence: 99%

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Solid‐to‐Hollow Conversion of Silver Nanocrystals by Surface‐Protected Etching

Liu

Fan

et al. 2018

Chemistry A European J

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Although hollow silver nanocrystals possess unique plasmonic properties, there is a lack of robust strategies to synthesize such nanocrystals with high efficiency and controllability. To solve this problem, a new surface‐protected etching strategy to convert solid Ag nanocrystals, which are widely available from conventional syntheses, into their hollow counterparts, producing a family of hollow Ag nanocrystals is reported. Hollow Ag nanospheres and nanotubes were prepared conveniently in this way. The key was the surface modification of Ag nanocrystals by a minor amount of Pt prior to a controllable etching process, which accounts for enhanced stability of the Ag surface and subsequent etching of Ag from the inner part of the nanocrystals while retaining the overall crystal morphology. These hollow Ag nanocrystals showed distinctive optical properties, as demonstrated by the enhanced optical transmittance of flexible electrodes fabricated with Ag nanotubes, compared to nanowires. These hollow Ag nanocrystals hold promise in different plasmonic and electronic applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Solid‐to‐Hollow Conversion of Silver Nanocrystals by Surface‐Protected Etching

Liu

Fan

et al. 2018

Chemistry A European J

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“…Heavy‐metal exposure has become a growing health problem worldwide, especially in the developing countries . Silver is one of the heavy metals frequently used in batteries, bearings, brazing, catalysts, and electronics . Even at low concentrations, this metal can be toxic to organisms, including humans .…”

Section: Introductionmentioning

confidence: 99%

Preparation of Fluorescent Thiol Group‐Functionalized Silica Microspheres for the Detection and Removal of Silver Ions in Aqueous Solutions

Shen

Liu

et al. 2018

J Chinese Chemical Soc

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We demonstrate that silica microspheres can act as a sensitive fluorescent sensor and adsorbent of Ag+ in aqueous media. These thiol‐functionalized silica microspheres are doped with quantum dots (QDs) using organosilane chemistry in a one‐step preparation. Ligand exchange takes place between the thiolated organosilane and acid‐capped QDs, making the doping easy. Ag+ adsorption by the silica microspheres causes the decrease of fluorescence intensity of the QDs. The detection limit for Ag+ is found to be 10 μmol/L. The abundance of thiol groups on the surface of the microspheres could effectively remove Ag+ through strong interaction. When microspheres with a diameter of 1.1 μm are used as the adsorbents, the adsorption capacity for Ag+ reached 102 mg/g. This excellent adsorption ability is due to the abundance of thiol groups that act as the active sites, facilitating the adsorption of the massive metal ions on the surface of the microspheres. Furthermore, the adsorption isotherm data follows the Freundlich model. The structure and content of the silica microspheres were investigated by scanning and high‐resolution transmission electron microscopy, energy dispersive X‐ray spectroscopy, and Raman analysis, and the fluorescence properties were characterized by fluorescence microscopy.

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“…TheP S/Ni/Au/Ag and SiO 2 /Pt Janus nanomotors decompose the H 2 O 2 fuel to generate O 2 molecules on their Ag or Pt side,r espectively,a nd thus power themselves by self-diffusiophoresis. [12] When the activator approaches the SiO 2 /Pt Janus nanomotors (for example, within ad istance of less than one body length of the activator), the SiO 2 /Pt motors sense the Ag + ion field around the activator,remarkably increasing the H 2 O 2 decomposition rate and consequently the speed of the motor. The detailed acceleration mechanism will be discussed in the proceeding text.…”

Section: Innaturethe Communication Between Living Organisms Ismentioning

confidence: 99%

Bioinspired Chemical Communication between Synthetic Nanomotors

et al. 2017

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While chemical communication plays ak ey role in diverse natural processes,the intelligent chemical communication between synthetic nanomotors remains unexplored. The design and operation of bioinspired synthetic nanomotors is presented. Chemical communication between nanomotors is possible and has an influence on propulsion behavior.A chemical "message" is sent from am oving activator motor to anearby activated (receiver) motor by release of Ag + ions from aJ anus polystyrene/Ni/Au/Ag activator motor to the activated Janus SiO 2 /Pt nanomotor.T he transmitted silver signal is translated rapidly into adramatic speed change associated with the enhanced catalytic activity of activated motors.S elective and successive activation of multiple nanomotors is achieved by sequential localized chemical communications.The concept of establishing chemical communication between different synthetic nanomotors paves the way to intelligent nanoscale robotic systems that are capable of cooperating with eachother.

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Beyond platinum: silver-catalyst based bubble-propelled tubular micromotors

Cited by 68 publications

References 41 publications

Solid‐to‐Hollow Conversion of Silver Nanocrystals by Surface‐Protected Etching

Solid‐to‐Hollow Conversion of Silver Nanocrystals by Surface‐Protected Etching

Preparation of Fluorescent Thiol Group‐Functionalized Silica Microspheres for the Detection and Removal of Silver Ions in Aqueous Solutions

Bioinspired Chemical Communication between Synthetic Nanomotors

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