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Single-Cell Photothermal Neuromodulation for Functional Mapping of Neural Networks
摘要： Photothermal neuromodulation is one of the emerging technologies being developed for neuroscience studies because it can provide minimal-invasive control of neural activity in the deep brain with sub-millimeter precision. However, single cell modulation without genetic modification still remains a challenge, hindering its path to the broad application. Here, we introduce a nanoplasmonic approach to inhibit single neural activity with high temporal resolution. Low intensity of near infrared (NIR) was focused at single cell size on gold nanorod (GNR) integrated microelectrode array platform, generating photothermal effect underneath a target neuron for photothermal stimulation. We found that the photothermal stimulation modulates the spontaneous activity of a target neuron in an inhibitory manner. Single neuron inhibition was fast and highly reliable without thermal damage, and it can induce changes in network firing patterns, potentially suggesting their application for in vivo circuit modulation and functional connectomes.
关键词： photothermal effects,local surface plasmonic resonance,neuromodulation,gold nanorod,neuron
更新于2025-09-23 15:23:52
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Quantification of Glucose via in situ Growth of Cu2O/Ag Nanoparticles
摘要： The monitoring of glucose levels in blood is extremely important for the effective control of diabetes. Nanomaterial-based approaches for the quantification of glucose typically require two steps: material preparation and the actual glucose measurement. Herein, we report a single-step method that combines these functions via the in situ growth of Cu2O/Ag nanoparticles (NPs). Mechanistically, we use glucose itself to reduce Cu2+ and Ag+ ions that are stabilized with 3-mercaptopropionic acid (3-MPA) and bovine serum albumin (BSA) under alkaline conditions to form Cu2O/Ag NPs and produce a color change in solution due to plasmonic resonance at 400 nm, which can be related back to the concentration of glucose. We study several factors in this reaction, including the molar ratios of the metal ions and 3-MPA, the reaction time, and the temperature to control the synthesis of the Cu2O/Ag NPs and thus their sensitivity toward glucose. Introducing BSA into the system is a key factor for the quantification of glucose in blood without pretreatment, improving the probe’s limit of detection and reducing the sample volumes to 1 μL. This colorimetric assay based on Cu2O/Ag NPs exhibits excellent sensitivity and specificity toward glucose, and a linear relationship with glucose concentrations ranging from 15 to 300 μM and a limit of detection of 9.2 μM. As proof of concept, we demonstrated that the Cu2O/Ag NP probes could successfully detect glucose in two representative blood samples by neglecting interferences from various common species, demonstrating the potential of this technique in point-of-care analysis.
关键词： plasmonic resonance,3-mercaptopropionic acid,bovine serum albumin,silver nanoparticles,glucose quantification,Cu2O
更新于2025-09-23 15:23:52
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In-situ Platinum Plasmon Resonance Effect Prompt Titanium Dioxide Nanocube Photocatalytic Hydrogen Evolution
摘要： In-situ photodeposition Pt nanoparticles (Pt NPs) on TiO2 on account of the surface plasmonic resonance (SPR) effect and strong interaction of two components, which exhibits an elevated solar-driven photocatalytic hydrogen evolution performance. Herein, Pt-decorated TiO2 nanocube hierarchy structure (Pt-TNCB) was in-situ fabricated via a facile solvothermal synthesis and photodeposition strategy. The Pt-TNCB exhibits an excellent solar-driven photocatalytic hydrogen evolution rate (337.84 μmol h-1), which is about 37 times higher than that of TNCB (9.19 μmol h-1). Interestingly, its photocatalytic property is still superior to TNCB with post modification Pt (1 wt %) (208.11 μmol h-1). The introduction of Pt efficiently extends the photoresponse of composite material from UV to visible light region, simultaneously boost their solar-driven photocatalytic performance, which attribute to the porous structure, the subsize TNCB, the SPR effect of Pt NPs and strong interaction of two components. In fact, Pt NPs can enhance collective oscillations on delocalized electrons, which is conducive to capture electrons and hinder the recombination of photogenerated electron-hole pairs, leading to the longer lifetime of photogenerated charges. The fabrication of Pt-TNCB photocatalyst with SPR effect may provide a promising method to improve visible-light photocatalytic activities for traditional photocatalysts.
关键词： hydrogen evolution,titanium dioxide,surface plasmonic resonance,photodeposition,photocatalyst
更新于2025-09-23 15:22:29
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Encyclopedia of Spectroscopy and Spectrometry || Surface-Enhanced Raman Optical Activity (SEROA)
摘要： This review discusses research into the enhancement of the chiroptical spectroscopic technique of Raman optical activity (ROA) through plasmonic resonance effects. The sensitivity of ROA spectroscopy to molecular stereochemistry and conformational dynamics has led to its increasing use in biology and the pharmaceutical sciences. However, the relative weakness of the ROA scattering process, being typically three to five orders of magnitude lower than the parent Raman scattering, has limited its application to conditions of relatively high concentrations and data accumulation times. The potential solution to this limitation in ROA by using the surface plasmon resonances that give rise to surface-enhanced Raman scattering (SERS) in order to boost ROA spectral intensity has been recognized by many researchers. Frustratingly, reliable measurement of this new technique of surface-enhanced Raman optical activity (SEROA) proved challenging to accomplish. A previous review by Abdali and Blanch presented the challenges involved in attempts to measure SEROA, as well as early results. Since then, significant advances have been made in exploring the SEROA phenomenon, and the time is appropriate for an updated account of this work. In order to provide sufficient background for guiding readers into the underlying principles of, and challenges faced in, measuring SEROA, we begin with an introduction to ROA before progressing on to its plasmonically-enhanced form.
关键词： chiroptical spectroscopy,SEROA,ROA,plasmonic resonance,Surface-Enhanced Raman Optical Activity,Raman Optical Activity,SERS,surface-enhanced Raman scattering
更新于2025-09-23 15:21:21
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Manipulating Optical Absorption of Indium Selenide Using Plasmonic Nanoparticles
摘要： In this work, we propose using periodic Au nanoparticles (NPs) in indium selenide-based optoelectronic devices to tune the optical absorption of indium selenide. Electromagnetic simulations show that optical absorption of indium selenide can be manipulated by tuning plasmonic resonance. The e?ect on the plasmonic resonance of the size, period of NPs, the thickness of silicon oxide, and the insulator spacer is systematically analyzed. A high absorption enhancement over the visible spectrum is achieved through systematic optimization of nanostructures.
关键词： optoelectronic devices,indium selenide,optical absorption,plasmonic nanoparticles,plasmonic resonance
更新于2025-09-23 15:21:01
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Efficient Cu/rGO/TiO2 nanocomposite-based photoanode for highly-optimized plasmonic dye-sensitized solar cells
摘要： Renewable energy resources play a valuable role in the global increase of energy demand. The research was performed to enhance the performance of plasmonic dye-sensitized solar cells (PDSSCs) by harvesting the maximum sunlight. In this context, the TiO2 nanoparticles for simple DSSCs and the Cu/rGO/TiO2 nanocomposites for PDSSCs were synthesized using the Sol–Gel and chemical reduction method. Authors demonstrated the utilization of synthesized Cu/rGO/TiO2 nanocomposite-based photoanode to fabricate the plasmonic dye-sensitized solar cells (PDSSCs). SEM, EDX, XRD, and UV/Vis techniques were employed to analyze the surface morphology, elemental composition, crystal structure, and absorbance spectra, respectively. Furthermore, IV measurements were performed on the fabricated devices, and it was observed that the Cu/rGO/TiO2 nanocomposite presented an enhanced efficiency of 5.14% in PDSSCs, which is more than that of the DSSCs-based on pure TiO2 nanoparticles. As an enhanced efficiency could be achieved by high optical absorption and electron injection rate, the PDSSCs with Cu/rGO/TiO2 nanocomposite have an enhanced efficiency due to the surface plasmonic resonance. An improved IPCE of 59.79% was also achieved in Cu/rGO/TiO2 nanocomposite-based photoanode, which might be due to the higher surface area of the photoanode.
关键词： Plasmonic dye-sensitized solar cells,Cu/rGO/TiO2 nanocomposite,Surface plasmonic resonance
更新于2025-09-23 15:21:01
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Tailoring optoelectronic properties of CH3NH3PbI3 perovskite photovoltaics using al nanoparticle modified PC61BM layer
摘要： In photovoltaics, light harvesting is one of the critical factors for the enhancement of power conversion efficiency (PCE). Photon harvesting can be carried out by various methods in perovskite photovoltaic. The improved light harvesting can also be achieved by trapping the light by incorporating metallic nanoparticles at the interface or in the perovskite active layer itself. Either light is absorbed or scattered by metallic nanoparticles depending on the particle size. When light is absorbed by the nanoparticles (size < 20 nm), it behaves like a sub-wavelength antenna due to localized surface plasmon resonance (LSPR) excitation and hence near field effect of plasmonic particle will be interacting to CH3NH3PbI3 active layer. Larger particles (> 20 nm) act as sub-wavelength scattering centers of light and help in trapping incident light. In order to make use of dual effect poly-dispersed spherical aluminium nanoparticles (AlNPs) (size – 20–70 nm) were incorporated in the CH3NH3PbI3 perovskite solar cell at the PC61BM/Al electrode interface. As a result, there is an increase in the optical absorption in the AlNPs embedded device. A detailed study of optical absorption, absorbed light emission characteristics charge trap density and carrier concentration studies, photovoltaic property measurements indicates, improvement in power conversion efficiency arise due to enhancement in JSC. Evaluated device properties indicate that enhancement in JSC arises due to improvement in the active layer photon absorption by both scattering and plasmonic effect in addition to reduced series resistance.
关键词： Trap states,Organic-inorganic halide perovskite solar cell,Ultraviolet plasmonic resonance,Plasmonic nanoparticle current density,Metal nanoparticles
更新于2025-09-23 15:19:57
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Enhanced circular dichroism in hybrid graphenea??metal metamaterials at the near-infrared region
摘要： Strong circular dichroism (CD) effect has gained great interest in nano-optical sensing and detection due to its desirable applications. In this work, we theoretically demonstrate that CD effects can be extremely enhanced in hybrid graphene–metal metamaterials at the near-infrared region. Benefiting from the strong coupling between graphene sheets and chiral metal nanocrystals, the maximum peak value of CD responses can be reached at 9.2% and the other peak value is more than twice as much as the without-graphene systems. When there is one more graphene layer covered on the chiral nanocrystals, the CD responses increase further. For single-layer graphene nanoribbons covered on the spacer, the CD response increases with the increasing filling ratio. The simulation results show that the CD response decreases rapidly with the increase of the distance between the chiral nanocrystals and the graphene sheet. Besides, with the increase of the thickness of the spacer, two CD resonance peaks, one increases faster and the other goes from decreasing to increasing compared with the without-graphene systems. Overall, we can greatly enhance CD effects in the near-infrared region by adding graphene layers, which can provide potential applications in the fields of biosensing and optoelectronic devices.
关键词： Plasmonic resonance,Graphene–metal metamaterials,Near-infrared region,Circular dichroism
更新于2025-09-23 15:19:57
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Plasmonic Emission of Bullseye Nanoemitters on Bi2Te3 Nanoflakes
摘要： Topological insulators, such as Bi2Te3, have been con?rmed to exhibit plasmon radiation over the entire visible spectral range. Herein, we fabricate bullseye nanoemitters, consisting of a central disk and concentric gratings, on the Bi2Te3 nano?ake. Due to the existence of edge plasmon modes, Bi2Te3 bullseye nanostructures are possible to converge light towards the central disk. Taking advantage of the excellent spatial resolution of cathodoluminescence (CL) characterization, it has been observed that plasmonic behaviors depend on the excitation location. A stronger plasmonic intensity and a wider CL spectral linewidth can be obtained at the edge of the central disk. In order to further improve the focusing ability, a cylindrical Pt nanostructure has been deposited on the central disk. Additionally, the ?nite element simulation indicates that the electric-?eld enhancement originates from the coupling process between the plasmonic emission from the Bi2Te3 bullseye and the Pt nanostructure. Finally, we ?nd that enhancement e?ciency depends on the thickness of the Pt nanostructure.
关键词： bullseye nanostructure,Bi2Te3 nano?akes,plasmonic resonance,cathodoluminescence
更新于2025-09-23 15:19:57
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Metal-Reduced WO3a??x Electrodes with Tunable Plasmonic Resonance for Enhanced Photoelectrochemical Water Splitting
摘要： Photoelectrochemical (PEC) water splitting is one of the most promising green technologies for producing renewable clean hydrogen energy. Developing plasmonic semiconductors with tunable plasmonic resonance to visible light has drawn increasing attention in view of utilizing abundant low-energy photons for solar-to-chemical conversion. Herein, we demonstrate for the first time that the WO3 electrode can be partly reduced by various metal foils in acid solution, showing strong localized surface plasmon resonance (LSPR) in the visible-to-near-infrared (Vis–NIR) region. The LSPR can be precisely tuned by using metal foils with different standard electrode potentials for different reaction times, and the LSPR peak position strongly depends on the concentration of W5+ in the WO3?x electrodes. A photocurrent density of 0.79 mA·cm?2 at 1.23 VRHE, which is twice that of pristine one, is obtained over an optimally reduced WO3?x electrode. The enhanced PEC water splitting performance is ascribed to the increased light absorption, conductivity and charge carrier concentration.
关键词： photoelectrochemical water splitting,semiconductor,plasmonic resonance,metal foil,tungsten oxide
更新于2025-09-23 15:19:57