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- 实验方案
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Poly(3a??hexylthiophene)/Gold Nanorod Composites as Efficient Holea??Transporting Materials for Perovskite Solar Cells
摘要： Poly(3-hexylthiophene)/gold nanorod (P3HT/AuNR) composites were developed and introduced as hole-transporting materials (HTMs) to fabricate mixed-ion perovskite solar cells (PSCs). The power conversion efficiency (PCE) of the optimized devices based on the composite HTM reached up to 16.88%, which was an increase of 26% from that of a pristine P3HT-based device (13.40%). The enhanced performance can be attributed to the increased crystallinity of P3HT induced by the addition of AuNRs in the polymer matrix and the localized surface plasmon resonance (LSPR) effect of AuNRs, which lead to higher carrier mobility and increased light utilization efficiency. This work provides a comprehensive understanding of the effect of plasmonic Au nanorods in PSCs application and a useful method to further improve the performance of PSCs.
关键词： gold nanorod,hole-transporting materials,perovskite solar cells,nanocomposite,P3HT
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 16th International Conference on Group IV Photonics (GFP) - Singapore, Singapore (2019.8.28-2019.8.30)] 2019 IEEE 16th International Conference on Group IV Photonics (GFP) - Light Emission Driven by Fano Resonances in Symmetry-Breaking Silicon Metasurface
摘要： A that combines light-emitting metasurface asymmetric silicon nanorod array with embedded Ge quantum dots is demonstrated. Light emission intensity enhancement and specific polarization of far-field radiation driven by the symmetry-breaking induced Fano resonances are observed and discussed.
关键词： Si nanorod,Ge quantum dot,Fano resonance
更新于2025-09-16 10:30:52
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Performance improvement of inverted perovskite solar cells using TiO2 nanorod array and mesoporous structure
摘要： In view of the low carrier mobility of organic materials, the carrier collection ability was suffered from the short transport length before carriers were recombined. To improve performances by enhancing carrier collection ability, the optimal period was 1.5 μm which was obtained by changing the period of titanium dioxide (TiO2) nanorod array in the inverted perovskite solar cells (IPSCs). The power conversion efficiency was improved to 11.96% from the 7.66% of the standard planar IPSCs. Besides, due to the inherent properties of high absorption surface area and high light scattering ability, the 150-nm-thick TiO2 mesoporous layer was embedded in the TiO2 electron transport layer. By changing the annealing temperature, the optimal crystallinity of anatase phase and the optimal porous distribution were obtained in the TiO2 mesoporous layers annealed at 500 °C for 30 min. Using the optimal annealed TiO2 mesoporous layers in the IPSCs, the power conversion efficiency was improved to 12.73%. The power conversion efficiency of 14.47% was obtained for the IPSCs embedded with the optimal 1.5-μm-periodic TiO2 nanorod array and the optimal 500 °C-annealed TiO2 mesoporous layer in the electron transport layer, simultaneously.
关键词： Nanorod array,Laser interference lithography system,Titanium dioxide material,Mesoporous layer,Inverted perovskite solar cells
更新于2025-09-16 10:30:52
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Improved near-UV electroluminescence of ZnO nanorod array LEDs by coupling with a graphene plasmon layer
摘要： The development of short-wavelength light-emitting diodes (LEDs) with high emission efficiency, a fascinating research area, is still necessary because of great scientific interest and practical significance. Here, a graphene plasmon layer treated by oxygen plasma was employed into ZnO nanorod/p-GaN LEDs for a surface plasmon effect. The graphene-decorated heterojunction exhibited an approximately 4-fold improvement of ZnO ultraviolet (UV) electroluminescence (EL) intensity relative to a primitive p-n junction device. Time-resolved spectroscopy and temperature-dependent luminescence measurement indicated that the EL enhancement resulted from the coupling of ZnO excitons with graphene surface plasmons. The current research not only provides an opportunity to construct three-dimensional architecture from a vertical array of one-dimensional nanorods and a two-dimensional graphene layer, but also proposes an effective strategy to improve near-UV emission efficiency in various devices.
关键词： ZnO nanorod,ultraviolet LED,graphene surface plasmon,p-n heterojunction
更新于2025-09-16 10:30:52
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Au-nanorod-clusters patterned optical fiber SERS probes fabricated by laser-induced evaporation self-assembly method
摘要： Optical ?ber surface-enhanced Raman scattering (SERS) probes provide a novel platform for liquid-phase in situ and remote SERS detections. However, it is still a challenge to fabricate noble metal nanostructures with large SERS enhancement factor (EF) onto optical ?ber surfaces. In this article, we successfully prepare Au-nanorod cluster structures on optical ?ber facets by a laboratory-developed laser-induced evaporation self-assembly method. It is demonstrated that the optimized optical ?ber SERS probes show high detection sensitivity (10?10 M for rhodamine 6G solution, and 10?8 M for malachite green or crystal violet solution) and excellent reproducibility (relative standard deviation less than 6%). As the laser-induced evaporation self-assembly method is a simple and low-cost method capable of achieving automatic and reproducible preparations of cluster patterned optical ?ber SERS probes, this work may ?nd important application prospects in various liquid-phase SERS detection areas.
关键词： Au-nanorod clusters,liquid-phase in situ detection,laser-induced evaporation self-assembly,SERS,optical fiber
更新于2025-09-16 10:30:52
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Plasmon-Emitter Hybrid Nanostructures of Gold Nanorod-Quantum Dots with Regulated Energy Transfer as a Universal Nano-Sensor for One-step Biomarker Detection
摘要： Recently, biosensing based on weak coupling in plasmon-emitter hybrid nanostructures exhibits the merits of simplicity and high sensitivity, and attracts increasing attention as an emerging nano-sensor. In this study, we propose an innovative plasmon-regulated fluorescence resonance energy transfer (plasmon-regulated FRET) sensing strategy based on a plasmon-emitter hybrid nanostructure of gold nanorod-quantum dots (Au NR-QDs) by partially modifying QDs onto the surfaces of Au NRs. The Au NR-QDs showed good sensitivity and reversibility against refractive index change. We successfully employed the Au NR-QDs to fabricate nano-sensors for detecting a cancer biomarker of alpha fetoprotein with a limit of detection of 0.30 ng/mL, which displays that the sensitivity of the Au NR-QDs nano-sensor was effectively improved compared with the Au NRs based plasmonic sensing. Additionally, to demonstrate the universality of the plasmon-regulated FRET sensing strategy, another plasmon-emitter hybrid nano-sensor of Au nano-prism-quantum dots (Au NP-QDs) were constructed and applied for detecting a myocardial infarction biomarker of cardiac troponin I. It was first reported that the change of absorption spectra of plasmonic structure in a plasmon-emitter hybrid nanostructure was employed for analytes detection. The plasmon-regulated FRET sensing strategy described herein has potential utility to develop general sensing platforms for chemical and biological analysis.
关键词： localized surface plasmon resonance,quantum dot,gold nanorod,biomarker,fluorescence resonance energy transfer,plasmonic-emitter hybrid nanostructure
更新于2025-09-16 10:30:52
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Hydrogel-embedded gold nanorods activated by plasmonic photothermy with potent antimicrobial activity
摘要： Plasmonic photothermal therapy (PPTT) has been used as an alternative to chemotherapy for the elimination of resistant microorganisms; however, its in situ evaluation has not been well studied. In the present study, we assessed the antimicrobial activity of a chitosan-based hydrogel embedded with gold nanorods (Ch/AuNRs) using a low power infrared diode laser. The antibacterial activity was measured in both Gram-positive and –negative strains, including clinical isolates of multidrug-resistant pathogens. The cytotoxic effect, cellular proliferation, and the expression of the pro-inflammatory (IL-6 and TNF-α) and anti-inflammatory (IL-10) cytokines were quantified in a murine model of macrophages. Results showed a potent antimicrobial activity of the Ch/AuNRs with MICs ≤4 μg/mL, very low cytotoxicity with cell viability above 80%, and the macrophage proliferation was not affected for a period of 48 h. These results suggest that our Ch/AuNR-embedded hydrogel could be an option to locally control chronic nosocomial infections using PPTT.
关键词： inflammation,multidrug resistant,antifungal,photothermal therapy,gold nanorod,cytotoxicity,chitosan,antibacterial
更新于2025-09-16 10:30:52
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Enhanced Visible Light Photodegradation of Microplastic Fragments with Plasmonic Platinum/Zinc Oxide Nanorod Photocatalysts
摘要： Microplastics are persistent anthropogenic pollutants which have become a global concern owing to their widespread existence and unfamiliar threats to the environment and living organisms. This study demonstrates the degradation of fragmented microplastics particularly low-density polyethylene (LDPE) film in water, through visible light-induced plasmonic photocatalysts comprising of platinum nanoparticles deposited on zinc oxide (ZnO) nanorods (ZnO-Pt). The ZnO-Pt nanocomposite photocatalysts were observed to have better degradation kinetics for a model organic dye (methylene blue) compared to bare ZnO nanorods, attributed to the plasmonic effects leading to better interfacial exciton separation and improved hydroxyl radical activity along with a 78% increase in visible light absorption. These demonstrations of the plasmonically enhanced photocatalyst enabled it to effectively degrade microplastic fragments as confirmed following the changes in carbonyl and vinyl indices in infrared absorption. In addition, visual proof of physical surface damage of the LDPE film establishes the efficacy of using plasmonically enhanced nanocomposite photocatalytic materials to tackle the microplastic menace using just sunlight for a clean and green approach towards mitigation of microplastics in the ecosystem.
关键词： microplastics,platinum nanoparticle,ZnO nanorod,LDPE film,visible light photodegradation,nanocomposite
更新于2025-09-16 10:30:52
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Higha??Efficiency Lowa??Temperaturea??Processed Mesoscopic Perovskite Solar Cells from SnO <sub/>2</sub> Nanorod Selfa??Assembled Microspheres
摘要： Mesoporous scaffolds in perovskite solar cells (PSCs) can accelerate the formation of heterogeneous nucleation sites, leading to enhanced quality of perovskite films and uniform perovskite coverage over large areas. Nevertheless, the mesoporous electron transport layers (ETLs) can effectively compensate for the drawback of shorter electron diffusion lengths than their hole counterparts. Therefore, most mesoscopic PSCs usually show superior photovoltaic performance to their planar counterparts. However, mesoporous ETLs, particularly those prepared with metal oxide nanocrystals, often require a high-temperature sintering process for the removal of residual organics and the improved crystallization of metal oxides. Here, a novel emulsion-based bottom-up self-assembly strategy is used to prepare sizable SnO2 microspheres from oleic acid capped SnO2 nanorods. Combined with an in-situ ligand-stripping strategy, the low-temperature solution-processed mesoscopic PSCs can achieve efficiency as high as 21.35% with slight hysteresis and good reproducibility. In particular, the emulsion-based bottom-up self-assembly strategy is a general way for preparing microspheres from several kinds of semiconductor nanocrystals, so it will greatly expand the material selection range for preparing efficient mesoscopic PSCs and even inverted mesoscopic devices.
关键词： mesoscopic perovskite solar cells,in situ ligand stripping,low-temperature process,SnO2 nanorod self-assembled microspheres
更新于2025-09-16 10:30:52
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Plasmonically Enhanced Upconversion Luminescence via Holographically Formed Silver Nanogratings
摘要： Greatly enhanced upconversion luminescence was demonstrated by integrating the core-shell upconversion nanorods with the Ag nanogratings. Both the Ag nanogratings and upconversion nanorods were fabricated/synthesized in a facile, cost-effective, high throughput way. Experimental results showed that the upconversion luminescence intensity of Er3+ in the core-shell upconversion nanorods can be well tuned and enhanced by changing the shell thickness and the period of the Ag nanograting. The underlying physical mechanism for the upconversion luminescence enhancement was attributed to the plasmonically enhanced near infrared broadband absorption of the periodic Ag nanograting and the localized surface plasmon resonance of Ag nanocrystals. The maximum enhanced factors of 523 nm, 544 nm (green emission) and 658 nm (red emission) of Er3+ ions excited at 980 nm are 3.8, 5.5 and 4.6 folds, respectively. Our fabrication approach and results suggest that such a simple integration is potentially useful for biosensing/imaging and anticounterfeiting applications.
关键词： plasmonic enhancement,upconversion,core-shell nanorod,nanograting,Holographical synthesis
更新于2025-09-12 10:27:22