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Near-Infrared Light-Driven Controllable Motions of Gold-Hollow-Microcone Array
摘要： Micro/nanomotors can effectively convert other forms of energy into mechanical energy, which have been widely used in microscopic fields. However, it is still challenging to integrate the micro/nanomotors to perform complex tasks for broad applications. Herein, a new mode for driving the collective motion behaviors of integrated micro/nanomotors in a liquid by plasmonic heating is reported. The integrated micro/nanomotors, constituted by gold hollow microcone array (AuHMA), are fabricated via colloidal lithography. Owing to the excellent plasmonic-heating property of AuHMA, the integrated micro/nanomotors can generate vapor bubbles in the liquid as exposure to near-infrared (NIR) irradiation, therefore inducing versatile motions via on/off NIR irradiation. The floating-diving motions are reversible for at least 60 cycles without fatigue. In addition, precise manipulation of the coordinated motion behaviors, including bending, convex, and jellyfish-like floating motions, can be realized by adjusting the irradiated positions of incident NIR light together with the sizes and shapes of AuHMA films. Moreover, the AuHMA film can act as a robust motor to drive a foam craft over 57 folds of its own weight as exposure to NIR irradiation. Our investigation into the NIR-driven AuHMA film provides a facile approach for obtaining integrated micro/nanomotors with controllable collective motions, which holds promise in remotely controlled smart devices and soft robotics in liquids.
关键词： motor,plasmonic heating,gold hollow microcone,controllable motions,light-driven
更新于2025-11-21 11:01:37
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Plasmonic heating using an easily recyclable Pda??functionalized Fe <sub/>3</sub> O <sub/>4</sub> /Au corea??shell nanoparticle catalyst for the Suzuki and Sonogashira reaction
摘要： Palladium functionalized gold nanoparticles were used in the past as a catalyst system in light induced cross-coupling reactions, but with a main limitation of the recuperation. To overcome this problem, a palladium functionalized Fe3O4/Au core-shell nanoparticle was successfully synthesized with a peak wavelength of 680 nm from the plasmon resonance of the gold shell. By the presence of the magnetite core, the nanoparticle catalyst can easily be removed using magnetic precipitation. This is accompanied with the advantage of having less valuable gold present in the system. The gold shell makes it possible to induce local heating using plasmon resonance. By this combination, it is possible to recuperate the catalyst system using magnetic precipitation and increase the control and safety of the reaction due to the presence of the light-induced plasmonic heating. It was possible to perform light-induced Suzuki cross-coupling reactions using this catalyst system, but with a dependency of the substrate. It was found that an anionic substrate is repulsed from the negatively charged core-shell nanoparticle. The catalyst was examined on its recuperation abilities and could be reused up to 5 cycles. At the catalytic site a temperature was reached between 40 °C and 45 °C. Despite the promising results of the Suzuki reaction, it was not possible to perform light-induced Sonogashira reactions due to the insufficient heat generation at the catalytic site. Nevertheless, these results are promising in the development of an easily recyclable catalyst together with an alternative heating source, resulting in an increase of control and safety.
关键词： cross-coupling reaction,magnetically separable,plasmonic heating,immobilized catalyst
更新于2025-09-23 15:19:57
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Nanoconfined water vapour as a probe to evaluate plasmonic heating
摘要： Engineering the photothermal effect in plasmonic materials is of paramount importance for many applications such as cancer therapy, chemical synthesis, cold catalysis and more recently for metasurfaces. Evaluation of plasmonic heating at the nanoscale is challenging and generally requires sophisticated equipments and/or temperature-sensitive probes such as fluorescent molecules or materials. Here we propose to use water vapor as probe to evaluate the local heating around plasmonic nanoparticles. We demonstrated the concept for the case of a plasmonic colloidal film composed by a bi-modal nanoporosity. In particular we exploit the thermal and light water liquid-vapor phase transitions taking place into the nanoporous medium that can be triggered by external stimulus such as heating or irradiation to obtain structural and optical variations in the films. Estimation of the local temperature was then obtained by using spectroscopic ellipsometry acquired by a multimodal chamber. More generally, this method offer a simple and general approach to determine local temperature that only requires a nanoporous material and water vapor, such as environmental humidity. In addition this approach can be further generalized to other materials, vapor molecules or optical technique.
关键词： local temperature measurement,spectroscopic ellipsometry,water vapor,nanoporous materials,plasmonic heating
更新于2025-09-23 15:19:57
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Bulk and localized plasmonic heating in nanogold doped polymers
摘要： Colloidal gold (Auc) nanoparticles (GNPs) and nanorods (GNRs) were incorporated into polymer blend ?lms and electrospun ?bers to utilize the nanoparticle plasmonic response for localized heating of the polymer. In this work, mathematical modeling was used to describe the GNP distribution and heat/melt pro?le surrounding each GNP in the polymer blend, demonstrating that a bulk temperature change of only 0.2 °C results in a 20-nm-diameter melted polymer sphere around the GNP. In addition, it was shown that by reducing the radius of polymer material around the GNP through the use of electrospinning ?bers in place of thin ?lm deposition, heating of the bulk material increased by 72%. Bulk heating of polymer blend ?lms containing either GNPs or GNRs was mapped using an infrared camera system with light-emitting diodes (LEDs) at 530 and 810 nm. The change in temperature observed in the thin ?lms was used to calculate the photo-thermal energy conversion ef?ciency of the respective nanogold doped polymer thin ?lms. Signi?cantly, GNR-doped ?lm ef?ciencies recorded were up to 6.6 times (558.6% increase) that of the polymer blend-only ?lm when interrogated at 810 nm, while the GNP-doped ?lm ef?ciency increased by 1.8 times (75.7% increase) under the 530 nm LED.
关键词： nanogold doped polymers,photothermal energy conversion,electrospun fibers,plasmonic heating
更新于2025-09-16 10:30:52
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Plasmonic Heating of Gold Nanoparticles for Controlling of Current across Lipid Membranes in Modulating Neuronal Behavior Applications
摘要： Electrophysiology is a golden method for the study of the nervous system. However, electrical stimulation has to deal with multiple challenges, including selectivity, spatial resolution, mechanical stability, and implant-induced injury. Optical stimulation techniques may avoid some of these challenges by providing more selective stimulation, higher spatial resolution and reduced invasiveness of the device. Optogenetics is a technique to introduce light-sensitive ion channels to neurons for optical stimulating of them with tight spatial and temporal confinement. While optogenetics provides a powerful tool for studying neural functions, the main limitation for clinical applications is gen expiration. One current status of the optical stimulation technique is using nanoparticles (NPs) for temperature manipulation of neural cells at the nanoscale. Nanoabsorbers like gold nanoparticles (AuNPs) when irradiated at their plasmon resonance, AuNPs heat up rapidly and confer this heat to the plasma membrane. Laser irradiation of light-absorbing AuNPs transiently increases cell membrane permeability [1]. Here, we present an investigation of the interaction patterns of AuNPs with diameters from 10 and 50 nm with artificial membranes which local plasmonic heating of AuNPs can be utilized to regulate membrane currents and conductance situations of membranes. In this study, the black lipid membrane (BLM) as an artificial planar lipid membranes were used. BLM experiments were accomplished using a small Teflon chamber with two compartments (cis and trans) are separated by a small aperture onto which the lipid bilayer membrane is formed. The compartments are each filled with a different concentration of KCl as an electrolyte solution. The membrane current (I) was measured through silver/silver-chloride electrodes inserted into the aqueous salt solutions on both sides of the membrane, using a current-to-voltage converter[2]. To study the effects of NPs with different sizes on the cell membranes, the diphytanoyl-phosphatidylcholine (DiphPC) lipid were selected as bilayer membranes. AuNPs with different sizes and concentrations were always added to the cis-side of the membrane. AuNPs were plunged into the solution after a short time a laser with a wavelength of λ = 532 nm was focused on the hole. The laser power for all experiment was set to be 50 mW. In our experiments, light sources consist of both continuous and pulse irradiations. The obtained results show the amount of current that ?ows through a bilayer membrane was 17 and 10 pA for a continuous and pulse irradiation to the NPs with size 50 nm, respectively. While in the same experimental conditions heating of NPs with the size 10 nm leads to the current pass of membrane equal to 12 and 8pA, respectively.
关键词： Lipid Membranes,Neuronal Behavior,Plasmonic Heating,Optical Stimulation,Gold Nanoparticles
更新于2025-09-11 14:15:04
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Light-Guided Surface Plasmonic Bubble Movement via Contact Line De-Pinning by In-Situ Deposited Plasmonic Nanoparticle Heating
摘要： Precise spatio-temporal control of surface bubble movement can benefit a wide range of applications like high-throughput drug screening, combinatorial material development, microfluidic logic, colloidal and molecular assembly, etc. In this work, we demonstrate that surface bubbles on a solid surface are directed by a laser to move at high speeds (> 1.8 mm/s), and we elucidate the mechanism to be the de-pinning of the three-phase contact line (TPCL) by rapid plasmonic heating of nanoparticles (NPs) deposited in-situ during bubble movement. Based on our observations, we deduce a stick-slip mechanism based on asymmetric fore-aft plasmonic heating: local evaporation at the front TPCL due to plasmonic heating de-pins and extends the front TPCL, followed by the advancement of the trailing TPCL to resume a spherical bubble shape to minimize surface energy. The continuous TPCL drying during bubble movement also enables well-defined contact line deposition of NP clusters along the moving path. Our finding is beneficial to various microfluidics and pattern writing applications.
关键词： pulsed laser,stick-slip motion,nanoparticles,plasmonic heating,micro-bubbles
更新于2025-09-11 14:15:04