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Enhancing the organic solar cell efficiency by combining plasmonic and F?rster Resonance Energy Transfer (FRET) effects
摘要： Here, we combine two strategies i.e., F€orster resonance energy transfer and plasmonic effect, to enhance the photovoltaic performance in organic solar cells by introducing gold nanoparticles and squaraine in a binary mixture of poly(3-hexylthiophene):phenyl-C61-butyric acid methyl ester. In this configuration, the F€orster resonance energy transfer between poly(3-hexylthiophene) and squaraine reduces the electrical loss arising from the exciton recombination in poly(3-hexylthiophene), while gold nanoparticles enable an efficient charge carrier generation in poly(3-hexylthiophene):squaraine mixture as optically confirmed by photoluminescence measurement and transient absorption spectroscopy. The multicomponent organic solar cells demonstrate an enhancement of ~36% in power conversion efficiency over the reference device.
关键词： Organic solar cells,Plasmonic effect,Squaraine,Gold nanoparticles,F€orster resonance energy transfer
更新于2025-09-19 17:13:59
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Plasmonic nucleotide hybridization chip for attomolar detection: localized gold and tagged core/shell nanomaterials
摘要： We report a large amplification of surface plasmon signals for a double hybridization microarray chip assembly that bridges localized gold and detection probe-carrying-core/shell Fe3O4@Au nanoparticles for detection of as low as 80 aM miRNA-155 marker in solution. The plasmonic wavelength match of the gold shell with surface localized gold nanoparticles and the additional scattering band of the core/shell material in resonance with the incident 800 nm light source are the underlying factors for the observed remarkable analyte signal at ultra-low (10?18 order) concentrations.
关键词： core/shell nanomaterials,nucleotide hybridization,attomolar detection,gold nanoparticles,Plasmonic
更新于2025-09-19 17:13:59
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Modulating plasmonic signatures of gold nanoparticles by fine tuning of surface roughness
摘要： Localized surface plasmon resonance peak of a plasmonic nanoparticle dictates its unique optical properties which are responsible for various applications like surface enhanced Raman scattering (SERS), surface enhanced Infra-red absorption (SEIRA), surface enhanced fluorescence (SEF) etc. In this report we have fine-tuned the surface morphology/roughness of pseudo spherical gold nanoparticles by reducing different metal precursors onto their surface using mild reducing ability of versatile polymer polyvinyl pyrrolidone (PVP) in alcoholic medium containing. The significant morphology/roughness dependent optical plasmonic signature defines optical parameters of plasmonic resonators like plasmon’s dephasing time, its quality factor as well as its bandwidth. Moreover, variation of these parameters with additive metal salts and its concentration is studied and a superlative conclusion was drawn between surface roughness and these optical parameters which were further confirmed by TEM data.
关键词： PVP,Gold nanoparticles,Optical properties
更新于2025-09-19 17:13:59
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Size-controlled synthesis of gold nanoparticles by ultrafine bubbles and pulsed ultrasound
摘要： Size-controlled gold nanoparticles (AuNPs) were synthesized by ultrasonic irradiation of HAuCl4 aqueous solutions with the aid of ultrafine bubbles (UFBs) in the absence of any capping and reducing agents. Upon addition of air-UFBs, the mean diameter of the spherical AuNPs decreased. This result was attributed to the sonochemical reduction of gold ions in aqueous solution being accelerated by the UFBs. Moreover, the AuNPs were stable in a solution containing UFBs because AuNPs electrostatically adsorbed onto UFBs, whose lifetime in water was very long. Compared with the mean diameter of AuNPs synthesized with argon-, nitrogen- and oxygen-UFBs, that of AuNPs synthesized with air-UFBs was smaller. Pulsed ultrasound delivered with the same time-averaged power as continuous-wave irradiation further decreased the mean diameter of the AuNPs. Size-controlled synthesis of AuNPs without the use of a capping or reducing agent was successful through optimization of the number air-UFBs and the pulsed ultrasound conditions.
关键词： Gold nanoparticles,Size control,Ultrasound,Pulse wave,Ultrafine bubbles,Colloidal stabilization
更新于2025-09-19 17:13:59
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Pulsed laser irradiation of a nanoparticles sensitised RDX crystal
摘要： The laser initiation of secondary explosives presents tactical, safety and environmental advantages over traditional ignition systems utilising primary explosives. In this paper, direct ignition or initiation by pulsed laser was investigated of cyclotrimethylenetrinitramine (RDX) crystals doped with gold nanoparticles (GNPs) for the first time. A nano-seconds pulsed laser was used for direct irradiation of the crystals at the GNP’s surface-plasmon-resonance wavelength of 532 nm. RDX crystals were recrystallised from a solution containing GNPs and characterised by visual microscopy for surface coating and subsurface doping. A high-speed camera was used to observe and capture the modes of interaction between the GNPs-doped RDX crystals and pulsed laser irradiation with a new classification method. Laser fluence thresholds for ignition and initiation were established. The GNPs sensitized RDX to pulsed laser irradiation at this selected wavelength is 3 orders of magnitude more sensitive than pure RDX. Direct initiation of the GNPs doped RDX crystal at laser fluence of 0.04 J/cm 2 led to the total consumption of a crystal sample, which was unreproducible with pure RDX. The results show that GNPs are effective optical sensitizers for direct initiation of RDX crystal by low-power pulsed laser.
关键词： Gold nanoparticles,Pulsed laser,Explosive,Laser ignition
更新于2025-09-19 17:13:59
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A novel periodically tapered structure-based gold nanoparticles and graphene oxide a?? Immobilized optical fiber sensor to detect ascorbic acid
摘要： This work presents a study, analysis, design, and characterization of a localized surface plasmon resonance (LSPR) based ascorbic acid (AA) sensor with improved sensitivity compared to those already reported. Various multi-tapered (four, five, and eight tapered) optical fiber sensors (OFSs) have been developed and characterized in this study. Along with these, different nanomaterials (NMs), such as gold nanoparticles (AuNPs) and graphene oxide (GO), are immobilized over the bare probe. Further, NMs immobilized probes are functionalized with ascorbate oxidase. The AuNPs are well studied in the past with the variation in size, shape and surface functionalization and have been found to be well-suited NMs for biosensing applications. On the other hand, GO-based material is equally promising in the nanostructure-based optical sensing due to their broad surface area, high electrical conductivity, good chemical stability, and excellent mechanical behavior. The performance parameters of the proposed sensor, such as sensitivity (8.3 nm/mM), correlation correlator (0.9724), and limit of detection (51.94 μM) are greatly improved over the previous designs. A wide range of characterization and validation of NMs immobilized structures are reported here. It indicates a great potential in the practical implementation of LSPR based OFSs for routine diagnostics.
关键词： Multi-tapered optical fiber sensor,Ascorbic acid,Gold nanoparticles,Ascorbate oxidase,Graphene oxide
更新于2025-09-19 17:13:59
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Temperature-controlled synthesis of hollow, porous gold nanoparticles with wide range light absorption
摘要： An easy synthesis method of hollow, porous gold nanoparticles (AuHP NPs) with controlled diameter and pores sizes and with a wide range of light absorbance (continuous between 500 and 900 nm) is presented together with the explanation of the nanoparticle formation mechanism. The NPs were investigated using transmission electron microscopy (TEM) combined with the selected area electron diffraction patterns, X-ray diffraction and ultraviolet–visible spectroscopy. TEM images showed that changing the synthesis temperature allows to obtain AuHP NPs with sizes from 35 ± 4 nm at 60 °C to 76 ± 8 nm at 90 °C. The effects of nanoscale porosity on the far- and near-field optical properties of the nanoparticles, as well as on effective conversion of electromagnetic energy into thermal energy, were applied in simulated photothermal cancer therapy. The latter one was simulated by irradiation of two cancer cell lines SW480 and SW620 with lasers operating at 650 nm and 808 nm wavelengths. The mortality of cells after using the synthesized AuHP NPs as photosensitizers is between 20 and 50% and increases with the decrease in the diameter of the AuHP NPs. All these attractive properties of the AuHP NPs make them find application in many biomedical studies.
关键词： photothermal therapy,wide range light absorption,temperature-controlled synthesis,hollow porous gold nanoparticles
更新于2025-09-19 17:13:59
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High-performance blue perovskite light-emitting diodes based on the a??far-field plasmonic effecta?? of gold nanoparticles
摘要： Metal halide perovskites have become the next-generation electroluminescent materials due to their excellent optoelectronic properties. In the last several years, there has been tremendous progress in the performance of red and green-light perovskite electroluminescent devices (PeLEDs) with external quantum efficiencies (EQE) exceeding 14% and 21%, respectively. In contrast, blue PeLEDs are still in infancy stage, due to EQEs below 1%. Therefore, development of blue PeLEDs is sorely needed since blue light plays a vital role in achieving full-color and white-light emission. In order to improve the efficiency of blue PeLEDs, herein we introduce gold nanoparticles (Au NPs) into poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) hole transport layer (HTL) to achieve a high performance blue PeLEDs with an emission wavelength ~475 nm. By introducing Au NPs, the optical properties of poly(ethylene oxide) (PEO):PEA2(CsPbBrxCl3?x)n?1PbBr4 perovskite films have been significantly improved leading to 3.8 times enhancement in fluorescence intensity. Based on this improvement, the blue PeLEDs record a maximum luminance and EQE of ~1110 cd/m2 and 1.64%, respectively performing among the best reported so far. Finally, the PeLED performance improvement is attributed to the far-field surface plasmonic effect of Au NPs. This effect is originated from the interference between the original chromophores emission and the mirror-reflected emission of mirror-type substrates. This study not only reveals the function of Au NPs in development of blue PeLEDs, but also offers new insights into the fundamental physics underlying the effect of surface plasmon resonance of Au NPs on perovskite light emitting devices.
关键词： gold nanoparticles,blue PeLEDs,Metal halide perovskites,far-field plasmonic effect,external quantum efficiency
更新于2025-09-19 17:13:59
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Fluorometric Sensing Platform Based on Localized Surface Plasmon Resonance using Quantum Dots-Gold Nanocomposites Optimizing the Linker Length Variation
摘要： The successful development of a label free sensing approach using the localized surface plasmon resonance (LSPR), controlling the distance between fluorescent CdZnSeS/ZnSeS quantum dots (QDs) and gold nanoparticles (AuNPs) has been established for the detection of virus. Here, we present a new combination of AuNPs and CdZnSeS/ZnSeS QDs linked with a peptide chain of 18 amino acids after functionalization in its both ends. The synthesized peptide has been used as a linker between these duos and provided the anchoring sides for the antibody conjugation. In the optimized condition, the fluorescent properties of the QDs have been enhanced due to the surface plasmon effect of the adjacent AuNPs. On the basis of the significance on LSPR sensing, we have attempted to detect different concentration of influenza virus in this work. The detection sensitivity has been analyzed by the quenched spectra of the fluorescence of QDs due to the induced steric effect of the attached virus molecule on the LSPR behavior. A detection limit of 26.4 fg mL-1 influenza virus has been obtained in a linear range of 10-14 to 10-9 g mL-1. On the basis of the obtained results and the detection mechanism, this proposed biosensor can be a good option for the detection of general biomolecule by altering the conjugated antibody and analytes, in the various range of sensing application.
关键词： biosensor,localized surface plasmon resonance,influenza virus,gold nanoparticles,quantum dots
更新于2025-09-19 17:13:59
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Preparation of Plasmonic Au-TiO2 Thin Films on a Transparent Polymer Substrate
摘要： In this work, plasmonic thin films composed of Au nanoparticles embedded in a TiO2 matrix were prepared in a transparent polymer substrate of poly(dimethylsiloxane) (PDMS). The thin films were deposited by reactive DC magnetron sputtering, and then subjected to heat treatment up to 150 °C in order to promote the growth of the Au nanoparticles throughout the TiO2 matrix. The transmittance spectrum of the thin films was monitored in situ during the heat treatment, and the minimum time required to have a defined localized surface plasmon resonance (LSPR) band was about 10 min. The average size of Au nanoparticles was estimated to be about 21 nm—the majority of them are sized in the range 10‐40 nm, but also extend to larger sizes, with irregular shapes. The refractive index sensitivity of the films was estimated by using two test fluids (H2O and DMSO), and the average value reached in the assays was 37.3 ± 1.5 nm/RIU, resulting from an average shift of 5.4 ± 0.2 nm. The results show that it is possible to produce sensitive plasmonic Au‐TiO2 thin films in transparent polymer substrates such as PDMS, the base material to develop microfluidic channels to be incorporated in LSPR sensing systems.
关键词： localized surface plasmon resonance,gold nanoparticles,thin films,poly(dimethylsiloxane) substrate,reactive magnetron sputtering,titanium dioxide
更新于2025-09-19 17:13:59