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Effects of thickness & shape on localized surface plasmon resonance of sexfoil nanoparticles

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Chinese Physics B 2017年第1期26卷 508-513页

作者： Yan Chen Xianchao Liu Weidong Chen Zhengwei Xie Yuerong Huang Ling Li College of Physics and Electronic Engineering Sichuan Normal University Chengdu 610101 China State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Information University of Electronic Science and Technology Chengdu 610054 China

localized surface plasmon （LSPR） resonance and sensing properties of a novel nanostructure （sexfoil nanoparticle） are studied using the finite-difference time-domain method. For the sandwich sexfoil nanoparticle, the calculated extinction spectrum shows that with the thickness of the dielectric layer increasing, long-wavelength peaks blueshift, while short- wavelength peaks redshift. Strong near-field coupling of the upper and lower metal layers leads to electric and magnetic field resonances; as the thickness increases, the electric field resonance gradually increases, while the magnetic field resonance decreases. The obtained refractive index sensitivity and figure of merit are 332 nm/RIU and 3.91 RIU^-1, respectively. In order to obtain better sensing ability, we further research the LSPR character of monolayer Ag sexfoil nanoparticle. After a series of trials to optimize the thickness and shape, the refractive index sensitivity approximates 668 nm/RIU, and the greatest figure of merit value comes to 14.8 RIU^-1.

关键词： sexfoil nanoparticle localized surface plasmon resonance extinction properties LSPR sensors

Biomolecule-templated photochemical synthesis of silver nanoparticles： Multiple readouts of localized surface plasmon resonance for pattern recognition

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Nano Research 2018年第6期11卷 3213-3221页

作者： Fang Pu Xiang Ran Meng Guan Yanyan Huang Jinsong Ren Xiaogang Qu Laboratory of Chemical Biology and State Key Laboratory of Rare Earth Resources Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China Cancer Center FirstAffiliated Hospital Jilin University Changchun 130061 China University of Chinese Academy of Sciences Beijing 100039 China

Silver nanoparticles （AgNPs） with distinct localized surface plasmon resonance （LSPR） absorption spectra can be synthesized using different proteins as templates upon irradiation by light. We utilized the multiple readouts of LSPR signals of AgNPs to construct sensor arrays for pattern recognition of proteins. Room temperature, aqueous solutions, and lack of harsh reducing reagents make the whole process inherently ＂green＂. Meanwhile, the strategy efficiently simplified the process of array-receptor preparation and data acquisition, leading to lower time consumption, sample use, and cost. Furthermore, the system can differentiate proteins using flexible and alterable sensor elements by choosing different combinations of LSPR signals at different wavelengths. The principle of the sensor design can also be further extended to differentiate other biomolecules. The study provides a new method to construct feasible, economical, and general nanoparficle-based sensing arrays for pattern recognition.

关键词： localized surface plasmon resonance silver nanoparticles pattern recognition biomolecule photochemical synthesis

Size dependent optical properties of LaB_6 nanoparticles enhanced by localized surface plasmon resonance

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Journal of Rare Earths 2013年第11期31卷 1096-1101页

作者：洪源张晓松李波李梦真石庆良王有为李岚 Institute of Material Physics Key Laboratory of Display Materials and Photoelectric Devices Ministry of Education Tianjin University of Technology

Lanthanum hexaboride nanopartieles, with high emission electrons in cathode materials and peculiar blocking near infrared wavelengths, were applied for many aspects. Based on the quasi-static approximation of Mie theory, the size dependent optical prop- erties of LaB6 nanoparticles were researched, such as refractive index n（ω）, extinction coefficient k（ω）, reflectivity R（ω）, absorption coefficient a（ω）, and electron energy loss L（ω）. Due to the localized surface plasmon resonance （LSPR）, the extinction coefficient k（ω） and absorption coefficient a（ω） depended on the size, and the LSPR peaks red-shifted with sizes increased, which was different from that of bulk materials. In addition, electron energy-loss spectrum L（co） showed electrons oscillation reinforced, since electrons absorbed the photon energy and generated resonance. Further, reftectivity R（ω） and refractive index n（ω） indicated that the light in near infrared region could not be propagated on the surface of LaB6 materials, which exhibited metallic behaviors. So the resonance peak of LaB6 nanoparticle was located in near-infrared region, making use of this property for solar control glazing and heat-shielding application.

关键词： LaB6 nanoparticles optical properties localized surface plasmon resonance absorption coefficient extinction coefficient rare earths

Modulating carrier density of the(Ag)_(x)(MoO_(3))_(y)system to enhance SERS:localized surface plasmon resonance contribution

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Journal of Materiomics 2023年第2期9卷 387-394页

作者： Lin Zhu Zhu Mao Peng Li Menglei Xu Zhen Meng Lei Chen Bing Zhao Stake Key Laboratory of Supramolecular Structure and Materials Jilin UniversityChangchun130012China School of Chemistry and Life Science Advanced Institute of Materials ScienceChangchun University of Technology Changchun130012China Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education Jilin Normal UniversityChangchun130103China

Semiconductors typically exhibit long-wavelength LSPR absorption in the infrared region due to lower carrier *** the carrier density of semiconductors and blue-shifting their LSPR absorption to the visible and near-infrared region has always been a great ***,we discussed how the controllable carrier of(Ag)x(MoO_(3))y composite influences the LSPR based on SERS test and UVeViseNIR absorption *** were surprised to find that the LSPR absorption wavelength can be easily tuned from 950 to 735 nm by changing the sputtering power of MoO_(3)of the(Ag)x(MoO_(3))_(y)*** shows that LSPR can be precisely adjusted by increasing the semiconductor content and even the carrier *** addition,the carrier density was measured by Hall effect to investigate the SERS intensity change caused by electromagnetic(EM)enhancement,and obtain the relationship between the *** findings of this work provide an idea for tunable LSPR and the research of EM contributions to SERS.

关键词： Carrier density localized surface plasmon resonance Semiconductor Electromagnetic surface-enhanced Raman scattering

Nanostructured materials with localized surface plasmon resonance for photocatalysis

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Chinese Chemical Letters 2022年第3期33卷 1154-1168页

作者： Juan Li Zaizhu Lou Baojun Li Institute of Nanophotonics Jinan UniversityGuangzhou 511443China State Key Laboratory for Crystal Materials Shandong UniversityJi'nan 250100China

localized surface plasmon resonance (LSPR) enhanced photocatalysis has fascinated much interest and considerable efforts have been devoted toward the development of plasmonic photocatalysts. In the past decades, noble metal nanoparticles (Au and Ag) with LSPR feature have found wide applications in solar energy conversion. Numerous metal-based photocatalysts have been proposed including metal/semiconductor heterostructures and plasmonic bimetallic or multimetallic nanostructures. However, high cost and scarce reserve of noble metals largely limit their further practical use, which drives the focus gradually shift to low-cost and abundant nonmetallic nanostructures. Recently, various heavily doped semiconductors (such as WO_(3-x), MoO_(3-x), Cu_(2-x)S, TiN) have emerged as potential alternatives to costly noble metals for efficient photocatalysis due to their strong LSPR property in visible-near infrared region. This review starts with a brief introduction to LSPR property and LSPR-enhanced photocatalysis, the following highlights recent advances of plasmonic photocatalysts from noble metal to semiconductor-based plasmonic nanostructures. Their synthesis methods and promising applicability in plasmon-driven photocatalytic reactions such as water splitting, CO_(2) reduction and pollution decomposition are also summarized in details. This review is expected to give guidelines for exploring more efficient plasmonic systems and provide a perspective on development of plasmonic photocatalysis.

关键词： localized surface plasmon resonance plasmonic photocatalysis plasmonic semiconductor Hot electrons Solar energy harvesting

Polydopamine-Assisted Fabrication of Fiber-Optic localized surface plasmon resonance Sensor Based on Gold Nanoparticles

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Transactions of Tianjin University 2015年第5期21卷 412-419页

作者：苏荣欣裴哲远黄仁亮齐崴王梦凡王利兵何志敏 State Key Laboratory of Chemical Engineering School of Chemical Engineering and TechnologyTianjin University Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) School of Environmental Science and Engineering Tianjin University Hunan Entry-Exit Inspection and Quarantine Bureau

A fast and facile method of fabricating fiber-optic localized surface plasmon resonance sensors baseff on spherical gold nanoparticles was introduced in this study. The gold nanoparticles with an average diameter of 55 nm were synthesized via the Turkevich method and were then immobilized onto the surface of an uncladded sensor probe using a polydopamine layer. To obtain a sensor probe with high sensitivity to changes in the refractive index, a set of key optimization parameters, including the sensing length, coating time of the potydopamine layer, and coating time of the gold nanoparticles, were investigated. The sensitivity of the optimized sensor probe was 522.80 nm per refractive index unit, and the probe showed distinctive wavelength shifts when the refractive index was changed from 1.328 6 to 1.398 7. When stored in deionized water at 4 ℃, the sensor probe proved to be stable over a period of two weeks. The sensor also exhibited advantages, such as low cost, fast fabrication, and simple optical setup, which indicated its potential application in remote sensing and real-time detection.

关键词： localized surface plasmon resonance sensor gold nanoparticles polydopamine optimization

Tunable and stable localized surface plasmon resonance in SrMoO_(4) for enhanced visible light driven nitrogen reduction

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Chinese Journal of Catalysis 2021年第10期42卷 1763-1771页

作者： Qiang Li Zhenhuan Zhao Xiaoxia Bai Xin Tong Shuai Yue Jingying Luo Xin Yu Zhenni Wang Zheng Wang Peipei Li Yanping Liang Zhiming Wang Department of Applied Chemistry School of Advanced Materials and NanotechnologyXidian UniversityXi'an 710126ShaanxiChina Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054SichuanChina National Center for Nanoscience and Technology Chinese Academy of SciencesBeijing 100190China Institute for Advanced Interdisciplinary Research University of JinanJinan 250022ShandongChina

Photocatalytic nitrogen reduction for the green synthesis of ammonia at ambient conditions has been slowed by the narrow light harvesting range,low activity and high charge recombination of *** semiconducting nanomaterials are becoming the promising candidates for nitrogen photofixation because of the broad absorption spectrum,rich defects and hot *** the present study,plasmonic SrMoO_(4) is developed by regulating the concentration of oxygen vacancies that are accompanied in the reduction process from Mo^(6+) to Mo^(5+).The stable and tunable localized surface plasmon resonance(LSPR)absorption in visible and near infrared light range makes the wide bandgap SrMoO_(4) utilize the solar energy more *** electrons from both the intrinsic band excitation and the LSPR excitation enable the reduction of dinitrogen molecules thermodynamically in ultrapure water to *** work provides a unique clue to design efficient photocatalysts for nitrogen fixation.

关键词： SrMoO4 plasmonic semiconductor localized surface plasmon resonance Oxygen vacancy Photocatalytic nitrogen reduction

Review of Fiber-Optic localized surface plasmon resonance Sensors:Geometries,Fabrication Technologies,and Bio-Applications

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Photonic Sensors 2024年第2期14卷 31-56页

作者： Mengdi LU Chen WANG Ruizhi FAN Ming LIN Jianye GUANG Wei PENG Affiliated Cancer Hospital Dalian University of TechnologyShenyang 110042China School of Physics Dalian University of TechnologyDalian 116024China

localized surface plasmon resonance(LSPR)biosensors,which enable nanoscale confinement and manipulation of light,offer the enhanced sensitivity and electromagnetic energy *** integration of LSPR with the fiber-optic technology has led to the development of compact and versatile sensors for miniaturization and remote *** comprehensive review explores various sensor configurations,fiber types,and geometric shapes,highlighting their benefits in terms of sensitivity,integration,and performance *** techniques such as focused non-chemical bonding strategies and self-assembly of nanoparticles are discussed,providing control over nanostructure morphology and enhancing sensor ***-applications of fiber-optic LSPR(FOLSPR)sensors are detailed,specifically in biomolecular interactions and analysis of proteins,pathogens and cells,nucleic acids(DNA and RNA),and other small molecules(organic compounds and heavy metal ions).surface modification and detection schemes are emphasized for their potential for label-free and real-time *** challenges and prospects of FOLSPR sensors are addressed,including the developments in sensitivity,fabrication techniques,and measurement *** with emerging technologies such as nanomaterials is highlighted as a promising direction for future ***,this review provides insights into the advancements and potential applications of FOLSPR sensors,paving the way for sensitive and versatile optical biosensing platforms in various fields.

关键词： Fiber-optic localized surface plasmon resonance biosensor nanoparticles geometric configuration fabrication technology

Toward transparent projection display:recent progress in frequency‐selective scattering of RGB light based on metallic nanoparticle’s localized surface plasmon resonance

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Opto-Electronic Advances 2019年第12期2卷 2-16页

作者： Yiyang Ye Zhen Liu Tupei Chen School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006China

A transparent display simultaneously enables visualization of the images displayed on it as well as the view behind it,and therefore can be applied to,for instance,augmented reality(AR),virtual reality(VR),and head up display(HUD).Many solutions have been proposed for this ***,the idea of frequency-selective scattering of red,green and blue light while transmitting visible light of other colours to achieve transparent projection display has been proposed,by taking advantage of metallic nanoparticle’s localized surface plasmon resonance(LSPR).In this article,a review of the recent progress of frequency-selective scattering of red,green and blue light that are based on metallic nanoparticle’s LSPR is presented.A discussion of method for choosing appropriate metal(s)is first given,followed by the definition of a figure of merit used to quantify the performance of a designed nanoparticle *** scattering of various nanostructures,including sphere-shaped nanoparticles,ellipsoidal nanoparticles,super-sphere core-shell nanoparticles,metallic nanocubes,and metallic nanoparticles combined with gain materials,are discussed in *** nanostructure has its own advantages and disadvantages,but the combination of the metallic nanoparticle with gain materials is a more promising way since it has the potential to generate ultra-sharp scattering peaks(i.e.,high frequency-selectivity).

关键词： light scattering localized surface plasmon resonance transparent display