20 results about "Localized surface plasmon" patented technology

A photoelectric conversion element including a thin film composed of a transition metal dichalcogenide and formed on a base material. In the present invention, a surface of the thin film composed of the transition metal dichalcogenide is modified with at least any nanorod particles of Au nanorod particles composed of Au and Ag nanorod particles composed of Ag. An average aspect ratio of the Au nanorod particles is 3.0 or more and 12.0 or less, and an average aspect ratio of the Ag nanorod particles is 3.0 or more and 13.0 or less. In the invention, the sensitivity to light having wavelengths in the near-infrared region improves by a sensitizing action attributed to localized surface plasmon resonance that is developed by the Au and Ag nanorod particles.

This invention discloses an Ag-Bi 24 Br 10 O 31 This paper discusses the preparation and application of Bi₂O₂S heterojunction composite materials, belonging to the field of SERS detection technology. First, Bi₂O₂S heterojunction composite materials are prepared using a hydrothermal method. 24 Br 10 O 31 Nanosheets, then with Bi 24 Br 10 O 31 Bi2O2S was constructed by secondary hydrothermal in-situ growth of Bi2O2S on nanosheets as a substrate. 24 Br 10 O 31 A Bi₂O₂S heterostructure was formed, followed by chemical reduction to load Ag nanoparticles, and then dried to obtain the target composite SERS substrate. This material utilizes the localized surface plasmon effect of Ag to form a strong SERS "hot spot," exhibiting excellent Raman enhancement performance for crystal violet, enabling highly sensitive detection of crystal violet. This method is simple, uses readily available raw materials, and produces a material that combines excellent SERS enhancement performance with photocatalytic activity, showing broad application prospects in environmental monitoring and pollution control.

The application provides a kind of plasmonic enhancement phototransistor structure, detection array and photoelectric detection method, the phototransistor structure includes thin film transistor and the Schottky photodiode with localized surface plasmon effect being arranged on the gate dielectric layer of thin film transistor;Wherein, photodiode includes receiving layer, first insulating layer, transparent gate electrode layer is formed on the first insulating layer and N super surface groove structure is formed in transparent gate electrode layer.The Schottky photodiode with localized surface plasmon effect is arranged on the gate dielectric layer of thin film transistor, can utilize the hot carrier generated by photodiode under localized surface plasmon effect to change the potential distribution in the channel layer of thin film transistor and gate voltage, to realize the exponential amplification of weak hot carrier signal generated by surface plasmon effect, effectively improve the sensitivity and signal-to-noise ratio of plasmonic photodetector.

This utility model relates to the field of biosensor technology and discloses a vanadium nitride-enhanced fiber optic SPR sensor. The vanadium nitride-enhanced fiber optic SPR sensor provided includes an optical fiber body with a sensing region formed on the optical fiber body. From the inside to the outside, a gold film layer, a vanadium nitride film layer, and a gold nanoparticle film layer are respectively attached to the surface of the sensing region. By introducing vanadium nanosheets, which have high conductivity, low loss, and high refractive index, a composite structure is formed with noble metal nanoparticles (Au NPs), constructing a "high refractive index medium enhancement-localized surface plasmon resonance synergy" system. This compensates for the energy loss of the metal film, enhances the interaction between the electromagnetic field and the target molecules, and further improves the sensitivity of the sensor.

The application discloses a gold nanorod enhanced photothermal elastic gas detection system and a detection method, which are used for improving the universality of the gas detection system. The system comprises an adjustable laser, a gas cell and a quartz tuning fork. The light receiving area of the quartz tuning fork is arranged at the corresponding position of the modulated laser output by the adjustable laser. The light receiving area is provided with a photoelectric conversion film coating. The photoelectric conversion film coating comprises gold nanorod material deposited on the surface of the quartz tuning fork. The longitudinal localized surface plasmon resonance absorption peak of the gold nanorod material is matched with the absorption wavelength band of the to-be-detected gas. When the modulated laser emitted by the gas cell irradiates the photoelectric conversion film coating, the gold nanorod material enhances the absorption of the modulated laser through the localized surface plasmon resonance effect and converts the modulated laser into heat energy. The heat energy generated by the photoelectric conversion film coating is transmitted to the quartz tuning fork, so that the quartz tuning fork generates thermal elastic deformation and excites the quartz tuning fork to vibrate and output a gas concentration electric signal.

The invention discloses a reflective harmonic radiation enhancement device and a preparation method thereof, and aims to overcome the defects of low nonlinear harmonic conversion efficiency, weak metal nonlinearity, insufficient concentration of a pure medium light field and the like in the prior art. The device comprises an outer protective layer and an internal F-P cavity, the F-P cavity is composed of a first reflecting layer, a dielectric layer and a second reflecting layer, the first reflecting layer is a super-structure surface with gold nano units arranged periodically, and the dielectric layer adopts an organic polymer PFO film. Double enhancement of a light field is achieved through the synergistic effect of local surface plasmon resonance and F-P cavity mode resonance, and the third harmonic conversion efficiency is improved by more than two orders of magnitude compared with a single nonlinear film in combination with the high third-order nonlinear coefficient of PFO. The preparation method adopts the processes of electron beam exposure, evaporation, spin coating and the like, and is simple in process and high in integration. The device is good in stability and wide in adaptability, the limitation of a single resonance mechanism is effectively broken through, and a reliable solution is provided for nonlinear optical signal regulation and control and integrated device application.

The application discloses a metal nanoparticle modified gallium oxide film solar blind ultraviolet detector and a preparation method thereof, and relates to the technical field of surface modification of metal materials. The application replaces traditional noble metal materials with inexpensive metal nanoparticles, utilizes the localized surface plasmon resonance effect of the inexpensive metal nanoparticles in the solar blind ultraviolet band, and combines the interface barrier between the gallium oxide layer to realize synergistic regulation, so that a surface modification function structure is constructed on the surface of the gallium oxide photosensitive layer. The device can realize synergistic optimization of light absorption enhancement, efficient separation and transport of photo-generated carriers and effective suppression of dark current, has good solar blind wave band selection characteristics, and has significantly improved photoelectric detection sensitivity, light and dark current matching characteristics and working stability. The overall preparation process is simple, compatible and controllable in cost, and is suitable for industrialization popularization and practical application of gallium oxide-based deep ultraviolet solar blind detector devices.

This invention proposes a graphyne / gold nanocomposite material, its preparation method, and its application. The graphyne / gold nanocomposite material comprises graphyne and gold nanoparticles loaded on its surface. Graphyne can enrich the gold nanoparticles, and the gold nanoparticles loaded on the graphyne can generate a localized surface plasmon resonance effect, thereby providing a SERS signal response. The substrate of this invention exhibits good SERS signal response to dyes and plant toxins, and the substrate enhancement effect is stable and highly reproducible, ensuring the accuracy and reliability of the detection results. This invention also proposes the application of the above-mentioned graphyne / gold nanocomposite material as a surface-enhanced Raman scattering substrate for detecting isoxazole / tryptamine toxins in mushrooms. This enables rapid detection of psilocybin and amatoxins in complex matrices of fungal samples; it can be used for rapid screening of highly poisonous mushrooms and their products in food safety, showing significant application prospects.

This application relates to the field of biomedical sensing and wearable health monitoring technology, and discloses a photoelectrochemical sensing microneedle and its preparation method, monitoring system, and detection method. The sensing microneedle comprises a swellable dual-network hydrogel microneedle matrix, a three-dimensional conductive network composed of high aspect ratio metal nanowires with localized surface plasmon resonance effect, and a semiconductor nanostructure composited on the surface of the metal nanowires to form a Schottky heterojunction. The mechanical constraint of the rigid polymer framework and the high aspect ratio of the metal nanowires synergistically ensure the continuity of the conductive network in the swelled state. Under excitation light irradiation, hot electrons migrate through the built-in electric field of the Schottky junction to the semiconductor surface to generate reactive oxygen free radicals. These free radicals then non-enzymatically catalyze the oxidation of target analytes in the interstitial fluid under zero or low bias voltage, generating a photocurrent signal, thus integrating minimally invasive sampling with in-situ highly selective detection.

This invention relates to photothermal catalytic materials, specifically disclosing a W 18 O 49 / Bi2MoO6 heterojunction photothermal catalyst, its preparation method and application. First, W is prepared by a solvothermal method. 18 O 49 Powder, and then construct W through a hydrothermal synthesis strategy. 18 O 49 / Bi2MoO6 heterojunction. A composite catalyst with nanowires uniformly grown on a nanosheet structure was obtained. This invention utilizes W 18 O 49 The localized surface plasmon resonance effect and oxygen vacancy characteristics, combined with the unique layered structure and suitable valence band position of Bi₂MoO₆ material, enable the composite of these two materials to construct a matched bandgap interface, effectively broadening the spectral response range and enhancing photothermal synergy. The preparation process of this invention is mild and controllable, using readily available and highly reproducible raw materials, and can efficiently achieve CO₂ reduction, making it suitable for carbon neutralization and CO₂ resource utilization.

Described herein is a fluorescent nanocomposite. The fluorescent nanocomposite structure may include a plasmonic nanostructure comprising having at least one localized surface plasmon resonance wavelength (λLSPR), at least one spacer coating, at least one fluorescent agent having a maximum excitation wavelength (λEX), and at least one peptide-loaded major histocompatibility complex (MHC) molecule (pMHC). The fluorescent nanocomposite structure has a fluorescent intensity that is at least 500 times greater than a fluorescent intensity of the at least one fluorescent agent alone.

The application discloses an erbium-doped zinc selenide composite material and a preparation method and application thereof. The preparation method comprises the following steps: dissolving zinc nitrate hexahydrate and erbium nitrate hexahydrate with a molar ratio of 0.02-0.08 in deionized water; adding sodium selenite and sodium hydroxide; then adding a reducing agent, hydrazine hydrate; after hydrothermal reaction for h, washing and drying to obtain the erbium-doped zinc selenide composite material. The material is a cubic phase ZnSe structure, and the erbium is uniformly doped in the crystal lattice in a near-spherical particle shape. The application introduces rich 4f electron defect states in the ZnSe band gap by erbium doping, significantly promotes charge transfer (chemical enhancement), and improves the free carrier concentration to excite the localized surface plasmon resonance (electromagnetic enhancement), so that the synergistic effect of the two enhancement mechanisms is realized. The detection limit of the SERS substrate for methylene blue is as low as 3.24*10 ‑8 mol / L, and the enhancement factor is as high as 1.73*10 4 , which provides a new way for environmental pollutant monitoring.

This invention discloses a dual-resonance composite nanoantenna structure for enhancing the luminescence of monolayer molybdenum disulfide and its fabrication method. The structure includes an antenna substrate, a base assembly disposed on the surface of the antenna substrate, and multiple dual-resonance nanoantenna mechanisms disposed on the surface of the base assembly. An alumina top layer is disposed between the multiple dual-resonance nanoantenna mechanisms and the base assembly. This invention utilizes the strong localized surface plasmon hotspot effect generated by the nano-gap between the top-layer metal dimers to significantly improve the absorption efficiency and exciton generation rate of the intermediate molybdenum disulfide layer for incident light. Simultaneously, the high-Q Mie resonance supported by the bottom dielectric nanodisk serves as an optical microcavity, effectively suppressing non-radiative transitions and enhancing far-field radiation extraction capability. The synergistic effect of these two elements achieves an order-of-magnitude increase in the photoluminescence intensity of molybdenum disulfide.

This invention provides a phototransistor structure, a photodetector array structure, and a photodetector method. The phototransistor structure includes a thin-film transistor (TFT), which comprises a substrate layer and a channel layer, a source / drain electrode layer, a gate dielectric layer, and a transparent gate electrode layer sequentially formed thereon. A Schottky photodiode exhibiting localized surface plasmon resonance (SPR) is disposed between the gate dielectric layer and the transparent gate electrode layer of the TFT. By disposing a Schottky photodiode with SPR between the gate dielectric layer and the transparent gate electrode layer of the TFT, the hot carriers generated by the photodiode under the SPR can be used to change the potential distribution and gate voltage in the channel layer of the TFT, thereby achieving exponential amplification of the weak hot carrier signal generated by the SPR, effectively improving the sensitivity and signal-to-noise ratio of the plasmonic photodetector.

This invention belongs to the field of nanocomposite materials and spectroscopic detection technology. This invention discloses an Ag / Co-Bi4Ti3O... 12 Composite SERS substrate, its preparation method, and its application in the detection of crystal violet molecules in water: First, cobalt-doped bismuth titanate (Co-Bi4Ti3O) was prepared using a hydrothermal-calcination method. 12 Ag / Co-Bi4Ti3O was prepared by loading silver nanoparticles onto the surface of a carrier using sodium citrate as a reducing agent. 12 Composite SERS substrate. This invention utilizes cobalt doping to modify and optimize Bi4Ti3O. 12 By combining the electromagnetic enhancement effect of localized surface plasmon resonance of silver nanoparticles with the chemical enhancement effect of semiconductor charge transfer, a dual synergistic SERS enhancement system is constructed, solving the problems of weak enhancement effect of traditional SERS substrates, easy aggregation of silver particles, and poor detection uniformity and cycling stability. This enables ultra-trace, rapid, and highly sensitive Raman detection of crystal violet in water.

The application discloses a non-contact biochemical sensor of artificial local surface plasmon, which comprises an artificial surface plasmon transmission line, a dielectric substrate, an artificial local surface plasmon resonator array and a micro-flow cavity arranged on the artificial local surface plasmon resonator array and comprising a dielectric shell layer and a cavity pattern layer arranged in the dielectric shell layer, the cavity pattern layer is used for storing a solution to be measured, and the dielectric shell layer is in contact with the artificial local surface plasmon resonator array. The application provides a sensor in which the artificial local surface plasmon resonator array and the artificial surface plasmon transmission line are coupled with each other, the structures simulate optical surface plasmon characteristics in a microwave frequency band through a subwavelength periodic structure, electromagnetic field is strongly localized and slowly propagated, and therefore the interaction efficiency with a sample is enhanced, the characteristics prolong the interaction time of a measured sample and electromagnetic waves, and higher sensitivity and a Q factor are provided.

This invention relates to the field of nanomaterial synthesis, and particularly to an ultrafine MoO2 nanowire bundle exhibiting surface-enhanced Raman (SEPA) effect, its preparation method, and its applications. The preparation method includes the following steps: 1) A sol-gel reaction is carried out using P123, water, n-butanol, concentrated hydrochloric acid, and TEOS as raw materials. The reaction product is then heated and aged, followed by washing, filtration, drying, and calcination to obtain a hexagonal porous template. The aging temperature is 60–140°C. 2) Ammonium molybdate is dissolved in water and mixed with the template obtained in step 1). After stirring and standing, the mixture is dried for the first time, calcined under a hydrogen-containing inert atmosphere, and then the template is removed with hydrofluoric acid. After washing and a second drying, the final product is obtained. The ultrafine MoO2 nanowire bundle has a diameter of approximately 5 nm, a regular and controllable morphology, good repeatability and stability, and exhibits a strong localized surface plasmon resonance effect and outstanding SEPA effect.

This application provides a method for fabricating a display substrate and a display device, belonging to the field of display technology. The fabrication method includes: forming a nanoparticle layer on a rigid substrate, the nanoparticle layer comprising multiple nanoparticles, the nanoparticles possessing localized surface plasmon resonance (SPR) characteristics; forming a flexible substrate on the metal nanoparticle layer; forming functional layers on the flexible substrate; and peeling off the rigid substrate and the nanoparticle layer using laser lift-off to obtain the display substrate. In this application, a nanoparticle layer with localized SPR characteristics is formed between the rigid substrate and the flexible substrate, enabling efficient peeling off of the rigid substrate and the nanoparticle layer, avoiding incomplete peeling of the flexible substrate due to scratches on the rigid substrate.