Magnetoswitchable Charge Transport and Bioelectrocatalysis Using Maghemite‐Au Core‐Shell Nanoparticle/Polyaniline Composites

Riskin, Michael; Basnar, B.; Huang, Ye; Willner, Itamar

doi:10.1002/adma.200602971

Cited by 65 publications

(46 citation statements)

References 38 publications

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“…Many technological applications require magnetic nanoparticles to be embedded in a non-magnetic matrix (polyaniline, diblock copolymers, cross-linked amhiphilic block copolymer aminoacids) [4][5][6][7][8][9][10]. Over the past few years, increased attention has been focused on the preparation of various nanostructures with magnetic nanoparticulate components and on understanding the magnetic behavior of nanoparticles, due to new possible surface, inter-particle, and exchange interactions in magnetic/ non-magnetic matrices [11].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and magnetic characterization of Zn0.6Ni0.4Fe2O4 nanoparticles via a polyethylene glycol-assisted hydrothermal route

Sertkol

Köseoğlu

Baykal

et al. 2009

Journal of Magnetism and Magnetic Materials

124

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Section: Introductionmentioning

confidence: 99%

Synthesis and magnetic characterization of Zn0.6Ni0.4Fe2O4 nanoparticles via a polyethylene glycol-assisted hydrothermal route

Sertkol

Köseoğlu

Baykal

et al. 2009

Journal of Magnetism and Magnetic Materials

124

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“…[32] Towards this goal, magnetic particles were coated with a Au shell, and the core/shell magnetic nanoparticles (NPs) were functionalized with lipoic acid. The particles were then incorporated into a polyaniline film electropolymerized onto a Au surface.…”

Section: Feature Articlementioning

confidence: 99%

From Molecular Machines to Microscale Motility of Objects: Application as “Smart Materials”, Sensors, and Nanodevices

Willner

Basnar

Willner

2007

Adv Funct Materials

Self Cite

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Machinelike operations are common functions in biological systems, and substantial recent research efforts are directed to mimic such processes at the molecular or nanoscale dimensions. The present Feature Article presents three complementary approaches to design machinelike operations: by the signal‐triggered mechanical shuttling of molecular components; by the signal‐triggering of chemical processes on surfaces, resulting in mechanical motion of micro/nanoscale objects; and by the fuel‐triggered motility of biomolecule–metal nanowire hybrid systems. The shuttling of molecular components on molecular wires assembled on surfaces in semirotaxane configurations using electrical or optical triggering signals is described. The control of the hydrophilic/hydrophobic surface properties through molecular shuttling or by molecular bending/stretching processes is presented. Stress generated on microelements, such as cantilevers, results in the mechanical deflection of the cantilever. The deposition of a redox‐active polyaniline film on a cantilever allows the reversible electrochemically induced deflection and retraction of the cantilever by the electrochemical oxidation or reduction of the polymer film, respectively. A micro‐robot consisting of the polypyrrole (PPy) polymer deposited on a multi‐addressable configuration of electrodes is described. Au magnetic core/shell nanoparticles are incorporated into a polyaniline film, and the conductivity of the composite polymer is controlled by an external magnet. Finally, the synthesis of a hybrid nanostructure consisting of two actin filaments tethered to the two ends of a Au nanowire is described. The adenosine triphosphate (ATP)‐fueled motility of the hybrid nanostructure on a myosin monolayer associated with a solid support is demonstrated.

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“…For example, various materials have been proved to be able to control electrocatalysis and the electron-transfer process of redox bimolecular (e.g., proteins and enzymes) through external signals, such as pH [2][3][4][5], temperature [6,7], light [8,9] and magnetic fields [10,11].…”

Section: Introductionmentioning

confidence: 99%

Glassy carbon electrode modified with gold nanoparticles and hemoglobin in a chitosan matrix for improved pH-switchable sensing of hydrogen peroxide

et al. 2015

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Hemoglobin (Hb) has been demonstrated to endow electrochemical sensors with pH-switchable response because of the presence of carboxyl and amino groups. Hb was deposited in a chitosan matrix on a glassy carbon electrode (GCE) that was previously coated with clustered gold nanoparticles (Au-NPs) by electrodeposition. The switching behavior is active ("on") to the negatively charged probe [Fe(CN) 63− ] at pH 4.0, but inactive ("off") to the probe at pH 8.0. This switch is fully reversible by simply changing the pH value of the solution and can be applied for pH-controlled reversible electrochemical reduction of H 2 O 2 catalyzed by Hb. The modified electrode was tested for its response to the different electroactive probes. The response to these species strongly depends on pH which was cycled between 4 and 8. The effect is also attributed to the presence of pH dependent charges on the surface of the electrode which resulted in either electrostatic attraction or repulsion of the electroactive probes. The presence of Hb, in turn, enhances the pH-controllable response, and the electrodeposited Au-NPs improve the capability of switching. This study reveals the potential of protein based pH-switchable materials and also provides a simple and effective strategy for fabrication of switchable chemical sensors as exemplified in a pH-controllable electrode for hydrogen peroxide.

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Magnetoswitchable Charge Transport and Bioelectrocatalysis Using Maghemite‐Au Core‐Shell Nanoparticle/Polyaniline Composites

Cited by 65 publications

References 38 publications

Synthesis and magnetic characterization of Zn0.6Ni0.4Fe2O4 nanoparticles via a polyethylene glycol-assisted hydrothermal route

Synthesis and magnetic characterization of Zn0.6Ni0.4Fe2O4 nanoparticles via a polyethylene glycol-assisted hydrothermal route

From Molecular Machines to Microscale Motility of Objects: Application as “Smart Materials”, Sensors, and Nanodevices

Glassy carbon electrode modified with gold nanoparticles and hemoglobin in a chitosan matrix for improved pH-switchable sensing of hydrogen peroxide

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