Visible light–gated reconfigurable rotary actuation of electric nanomotors

Liang, Zexi; Fan, Donglei

doi:10.1126/sciadv.aau0981

Cited by 55 publications

(55 citation statements)

References 57 publications

(84 reference statements)

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“…More recently, a couple of techniques emerged such as maskless processes by reactive ion etching (RIE) [35] or RIE processes through the oxide native layer of silicon [58][59][60] (see Figure 1c). Moreover, a few groups employed a technique combining two existing techniques: the nanosphere lithography (NSL) and the MACE technique [61][62][63][64] (see Figure 1d for the principle scheme of this coupled technique of fabrication). [31] with permission from the Royal Society of Chemistry; (b) Si nanowires produced through an Ag-assisted chemical etching of n-Si(100) wafer (height h∼32 µm and diameter: 80 nm < D < 200 nm), reprinted with permission from [37], Copyright 2010 American Chemical Society; (c) Au/Si nanopillars (NP) obtained with the fabrication technique based on an RIE process through the oxide native layer followed by a deposition of a gold layer of 30 nm (scale bar = 5 µm, radius R∼125 nm and height h∼1000 nm); (d) principle scheme of the low-cost fabrication process combining NSL and MACE for producing AuNP-conjugated Si nanorod arrays (reprinted with permission from [63], copyright 2017 American Chemical Society).…”

Section: Fabrication Methods Of Metal-coated Si Nanosensorsmentioning

confidence: 99%

Fabrication and SERS Performances of Metal/Si and Metal/ZnO Nanosensors: A Review

Barbillon

2019

Coatings

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Surface-enhanced Raman scattering (SERS) sensors are very powerful analytical tools for the highly sensitive detection of chemical and biological molecules. Substantial efforts have been devoted to the design of a great number of hybrid SERS substrates such as silicon or zinc oxide nanosystems coated with gold/silver nanoparticles. By comparison with the SERS sensors based on Au and Ag nanoparticles/nanostructures, higher enhancement factors and excellent reproducibilities are achieved with hybrid SERS nanosensors. This enhancement can be due to the appearance of hotspots located at the interface between the metal (Au/Ag) and the semiconducting substrates. Thus, in this last decade, great advances in the domain of hybrid SERS nanosensors have occurred. In this short review, the recent advances of these hybrid metal-coated semiconducting nanostructures as SERS sensors of chemical and biological molecules are presented.

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Section: Fabrication Methods Of Metal-coated Si Nanosensorsmentioning

confidence: 99%

Fabrication and SERS Performances of Metal/Si and Metal/ZnO Nanosensors: A Review

Barbillon

2019

Coatings

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“…The propulsion of micro-and nanomotors can also be provided by external energy sources, including light, [124][125][126] electric fields, [127][128][129] US, [91,[130][131][132][133][134][135][136] or magnetic fields. [137][138][139][140][141][142] One of the main advantages of externally actuated devices is the possibility to be propelled or steered in a noninvasive fashion, which could serve to guide imaging agents toward the intended region of interest with a high precision.…”

Section: Physically Poweredmentioning

confidence: 99%

Engineering Intelligent Nanosystems for Enhanced Medical Imaging

Moolenbroek

Patiño

Llop

et al. 2020

Advanced Intelligent Systems

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Photoacoustic imaging NIR dyes Cyanine-based dyes, Rhodamine, Alexa Fluor dyes Fluorescent proteins or endogenous chromophores GDP, RFP, Biliverdin etc. Azo chromophores Methylene blue, Evans blue Metal-based Au, Ag, Pd, Cu Carbon-based Graphene, carbon nanotubes, nanodiamonds Polymer-based Conjugated polymers, porphyrin-related agents a) These materials can be formulated in nanosize, or incorporated in nanocarriers such as liposomes, dendrimers, nanoemulsions, polymeric NP, mesoporous silica NP, or others.

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“…Micro/nanomotors have aroused considerable interest in the past decade due to their potential applications in biomedical engineering [ 1 ] and environmental remediation [ 2 ]. To achieve active control and suitability for use in various environments, external stimuli including magnetic fields [ 3 ], light [ 4 , 5 ], acoustic fields [ 6 ], electric fields [ 7 ], and chemical reactions [ 8 ] are powerful tools for the precise actuation of micro/nanomotors toward the target regions in the preassigned tasks [ 9 ]. Although substantial progress has been achieved for improved self-propulsion of micro/nanomotors driven by various chemical reactions, further development of micro/nanomotors is still required to enable their industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Light-Triggered Catalytic Performance Enhancement Using Magnetic Nanomotor Ensembles

Wang

Zhang

2020

Research

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Micro/nanomachines have attracted extensive attention in the biomedical and environmental fields for realizing functionalities at small scales. However, they have been rarely investigated as active nanocatalysts. Heterogeneous nanocatalysts have exceptional reusability and recyclability, and integration with magnetic materials enables their recovery with minimum loss. Herein, we propose a model active nanocatalyst using magnetic nanomotor ensembles (MNEs) that can degrade contaminants in an aqueous solution with high catalytic performance. MNEs composed of a magnetite core coated with gold nanoparticles as the nanocatalyst can rotate under the action of a programmable external field and carry out rapid reduction of 4-nitrophenol (4-NP). The hydrogen bubbles generated in the catalytic reaction provide random perturbations for the MNEs to travel in the reaction solution, resulting in uniform processing. The reduction can be further boosted by irradiation with near-infrared (NIR) light. Magnetic field induces the rotation of the MNEs and provides microstirring in the catalysis. Light enhances the catalytic activity via the photothermal effect. These MNEs are also capable of moving to the targeted region through the application of a programmable magnetic field and then process the contaminant in the targeted region. We expect that such magnetic MNEs may help better in applying active heterogeneous nanocatalysts with magnetic field and light-enhanced performance in industrial applications due to their advantages of low material cost and short reaction time.

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Visible light–gated reconfigurable rotary actuation of electric nanomotors

Abstract: A widely applicable mechanism that facilely enables semicondutor micro/nanodevices with multifold mechanical reconfigurability.

Cited by 55 publications

References 57 publications

Fabrication and SERS Performances of Metal/Si and Metal/ZnO Nanosensors: A Review

Fabrication and SERS Performances of Metal/Si and Metal/ZnO Nanosensors: A Review

Engineering Intelligent Nanosystems for Enhanced Medical Imaging

Light-Triggered Catalytic Performance Enhancement Using Magnetic Nanomotor Ensembles

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