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Literatura académica sobre el tema "LSPR sensors"

Autor: Grafiati

Publicado: 10 de marzo de 2023

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Artículos de revistas sobre el tema "LSPR sensors"

Alharbi, Raed, Mehrdad Irannejad y Mustafa Yavuz. "A Short Review on the Role of the Metal-Graphene Hybrid Nanostructure in Promoting the Localized Surface Plasmon Resonance Sensor Performance". Sensors 19, n.º 4 (19 de febrero de 2019): 862. http://dx.doi.org/10.3390/s19040862.

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Localized Surface Plasmon Resonance (LSPR) sensors have potential applications in essential and important areas such as bio-sensor technology, especially in medical applications and gas sensors in environmental monitoring applications. Figure of Merit (FOM) and Sensitivity (S) measurements are two ways to assess the performance of an LSPR sensor. However, LSPR sensors suffer low FOM compared to the conventional Surface Plasmon Resonance (SPR) sensor due to high losses resulting from radiative damping of LSPs waves. Different methodologies have been utilized to enhance the performance of LSPR sensors, including various geometrical and material parameters, plasmonic wave coupling from different structures, and integration of noble metals with graphene, which is the focus of this report. Recent studies of metal-graphene hybrid plasmonic systems have shown its capability of promoting the performance of the LSPR sensor to a level that enhances its chance for commercialization. In this review, fundamental physics, the operation principle, and performance assessment of the LSPR sensor are presented followed by a discussion of plasmonic materials and a summary of methods used to optimize the sensor’s performance. A focused review on metal-graphene hybrid nanostructure and a discussion of its role in promoting the performance of the LSPR sensor follow.

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Lu, Mengdi, Wei Peng, Ming Lin, Fang Wang y Yang Zhang. "Gold Nanoparticle-Enhanced Detection of DNA Hybridization by a Block Copolymer-Templating Fiber-Optic Localized Surface Plasmon Resonance Biosensor". Nanomaterials 11, n.º 3 (1 de marzo de 2021): 616. http://dx.doi.org/10.3390/nano11030616.

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To overcome low surface coverage and aggregation of particles, which usually restricts the sensitivity and resolution of conventional localized surface plasmon resonance (LSPR) fiber-optic sensors, we propose a simple self-assembled templating technique that uses a nanometer thickness block copolymer (BCP) layer of poly(styrene-b-4-vinylpyridine) to form a 33 nm gold nanoparticle (AuNP) monolayer with high uniformity and density for LSPR sensing. The LSPR resonance wavelength for this PS-b-P4VP templated methodology is 592 nm and its refractive index sensitivity is up to 386.36 nm/RIU, both of which are significantly improved compared to those of conventional LSPR techniques. Calibrated by a layer-by-layer polyelectrolyte deposition procedure, the decay length of this LSPR sensor is calculated to be 78 nm, which is lower than other traditional self-assembled LSPR sensors. Furthermore, hybridization between target ssDNA, which is linked with capture ssDNA on the LSPR biosensor and DNA–AuNP conjugates, leads to a low detection limit of 67 pM. These enhanced performances are significant and valuable for high-sensitivity and cost-effective LSPR biosensing applications.

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Alharbi, Raed y Mustafa Yavuz. "Promote Localized Surface Plasmonic Sensor Performance via Spin-Coating Graphene Flakes over Au Nano-Disk Array". Photonics 6, n.º 2 (25 de mayo de 2019): 57. http://dx.doi.org/10.3390/photonics6020057.

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Although localized surface plasmonic resonance (LSPR) sensors have advantages over regular surface plasmonic resonance (SPR) sensors, such as in sensor setup, excitation method, and cost, they suffer from low performance when compared to SPR sensors, which thus limits their commercialization. Among different methods applied to promote LSPR sensor performance, metal-two-dimensional (2D) hybrid nanostructure has been shown to be an efficient improvement. However, metal-2D hybrid nanostructures may come in a complex or a simple scheme and the latter is preferred to avoid challenges in fabrication work and to be applicable in mass production. In this work, a new and simple gold-graphene hybrid scheme is proposed and its plasmonic sensing performance is numerically evaluated using the finite different time domain (FDTD) method. The proposed sensor can be fabricated by growing a Au nano-disk (ND) array on a quartz substrate and then spin-coating graphene flakes of different sizes and shapes randomly on top of and between the Au NDs. Very high sensitivity value is achieved with 2262 nm/RIU at a 0.01 refractive index change. The obtained sensitivity value is very competitive in the field of LSPR sensors using metal-2D hybrid nanostructure. This proposed sensor can be utilized in different biosensing applications such as immunosensors, sensing DNA hybridization, and early disease detection, as discussed at the end of this article.

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Lee, Seunghun, Hyerin Song, Heesang Ahn, Seungchul Kim, Jong-ryul Choi y Kyujung Kim. "Fiber-Optic Localized Surface Plasmon Resonance Sensors Based on Nanomaterials". Sensors 21, n.º 3 (26 de enero de 2021): 819. http://dx.doi.org/10.3390/s21030819.

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Applying fiber-optics on surface plasmon resonance (SPR) sensors is aimed at practical usability over conventional SPR sensors. Recently, field localization techniques using nanostructures or nanoparticles have been investigated on optical fibers for further sensitivity enhancement and significant target selectivity. In this review article, we explored varied recent research approaches of fiber-optics based localized surface plasmon resonance (LSPR) sensors. The article contains interesting experimental results using fiber-optic LSPR sensors for three different application categories: (1) chemical reactions measurements, (2) physical properties measurements, and (3) biological events monitoring. In addition, novel techniques which can create synergy combined with fiber-optic LSPR sensors were introduced. The review article suggests fiber-optic LSPR sensors have lots of potential for measurements of varied targets with high sensitivity. Moreover, the previous results show that the sensitivity enhancements which can be applied with creative varied plasmonic nanomaterials make it possible to detect minute changes including quick chemical reactions and tiny molecular activities.

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S. S. dos Santos, Paulo, José M. M. M. de Almeida, Isabel Pastoriza-Santos y Luís C. C. Coelho. "Advances in Plasmonic Sensing at the NIR—A Review". Sensors 21, n.º 6 (17 de marzo de 2021): 2111. http://dx.doi.org/10.3390/s21062111.

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Surface plasmon resonance (SPR) and localized surface plasmon resonance (LSPR) are among the most common and powerful label-free refractive index-based biosensing techniques available nowadays. Focusing on LSPR sensors, their performance is highly dependent on the size, shape, and nature of the nanomaterial employed. Indeed, the tailoring of those parameters allows the development of LSPR sensors with a tunable wavelength range between the ultra-violet (UV) and near infra-red (NIR). Furthermore, dealing with LSPR along optical fiber technology, with their low attenuation coefficients at NIR, allow for the possibility to create ultra-sensitive and long-range sensing networks to be deployed in a variety of both biological and chemical sensors. This work provides a detailed review of the key science underpinning such systems as well as recent progress in the development of several LSPR-based biosensors in the NIR wavelengths, including an overview of the LSPR phenomena along recent developments in the field of nanomaterials and nanostructure development towards NIR sensing. The review ends with a consideration of key advances in terms of nanostructure characteristics for LSPR sensing and prospects for future research and advances in this field.

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Duan, Qilin, Yineng Liu, Shanshan Chang, Huanyang Chen y Jin-hui Chen. "Surface Plasmonic Sensors: Sensing Mechanism and Recent Applications". Sensors 21, n.º 16 (4 de agosto de 2021): 5262. http://dx.doi.org/10.3390/s21165262.

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Surface plasmonic sensors have been widely used in biology, chemistry, and environment monitoring. These sensors exhibit extraordinary sensitivity based on surface plasmon resonance (SPR) or localized surface plasmon resonance (LSPR) effects, and they have found commercial applications. In this review, we present recent progress in the field of surface plasmonic sensors, mainly in the configurations of planar metastructures and optical-fiber waveguides. In the metastructure platform, the optical sensors based on LSPR, hyperbolic dispersion, Fano resonance, and two-dimensional (2D) materials integration are introduced. The optical-fiber sensors integrated with LSPR/SPR structures and 2D materials are summarized. We also introduce the recent advances in quantum plasmonic sensing beyond the classical shot noise limit. The challenges and opportunities in this field are discussed.

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Yin, Fengyu, Jin Liu, Haima Yang, Aleksey Kudreyko y Bo Huang. "Design and Optimization of Plasmon Resonance Sensor Based on Micro–Nano Symmetrical Localized Surface". Symmetry 12, n.º 5 (20 de mayo de 2020): 841. http://dx.doi.org/10.3390/sym12050841.

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Surface Plasma resonance (SPR) sensors combined with biological receptors are widely used in biosensors. Due to limitations of measurement techniques, small-scale, low accuracy, and sensitivity to the refractive index of solution in traditional SPR prism sensor arise. As a consequence, it is difficult to launch commercial production of SPR sensors. The theory of localized surface plasmon resonance (LSPR) developed based on SPR theory has stronger coupling ability to near-field photons. Based on the LSPR sensing theory, we propose a submicron-sized golden-disk and graphene composite structure. By varying the thickness and diameter of the array disk, the performance of the LSPR sensor can be optimized. A graphene layer sandwiched between the golden-disk and the silver film can prevent the latter from oxidizing. Symmetrical design enables high-low concentration of dual-channel distributed sensing. As the fixed light source, we use a 632.8-nm laser. A golden nano-disk with 45 nm thickness and 70 nm radius is designed, using a finite difference time domain (FDTD) simulation system. When the incident angle is 42°, the figure of merit (FOM) reaches 8826, and the measurable refractive index range reaches 0.2317.

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Proença, Manuela, Marco S. Rodrigues, Diana I. Meira, M. Cidalia R. Castro, Pedro V. Rodrigues, Ana V. Machado, Eduardo Alves, Nuno P. Barradas, Joel Borges y Filipe Vaz. "Optimization of Au:CuO Thin Films by Plasma Surface Modification for High-Resolution LSPR Gas Sensing at Room Temperature". Sensors 22, n.º 18 (17 de septiembre de 2022): 7043. http://dx.doi.org/10.3390/s22187043.

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In this study, thin films composed of gold nanoparticles embedded in a copper oxide matrix (Au:CuO), manifesting Localized Surface Plasmon Resonance (LSPR) behavior, were produced by reactive DC magnetron sputtering and post-deposition in-air annealing. The effect of low-power Ar plasma etching on the surface properties of the plasmonic thin films was studied, envisaging its optimization as gas sensors. Thus, this work pretends to attain the maximum sensing response of the thin film system and to demonstrate its potential as a gas sensor. The results show that as Ar plasma treatment time increases, the host CuO matrix is etched while Au nanoparticles are uncovered, which leads to an enhancement of the sensitivity until a certain limit. Above such a time limit for plasma treatment, the CuO bonds are broken, and oxygen is removed from the film’s surface, resulting in a decrease in the gas sensing capabilities. Hence, the importance of the host matrix for the design of the LSPR sensor is also demonstrated. CuO not only provides stability and protection to the Au NPs but also promotes interactions between the thin film’s surface and the tested gases, thereby improving the nanocomposite film’s sensitivity. The optimized sensor sensitivity was estimated at 849 nm/RIU, which demonstrates that the Au-CuO thin films have the potential to be used as an LSPR platform for gas sensors.

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Li, Guoru, Ragini Singh, Jiajun Guo, Bingyuan Zhang y Santosh Kumar. "Nb₂CT_x MXene-assisted double S-tapered fiber-based LSPR sensor with improved features for tyramine detection". Applied Physics Letters 122, n.º 8 (20 de febrero de 2023): 083701. http://dx.doi.org/10.1063/5.0143776.

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Niobium carbide (Nb2CTx), a type of MXene with high optical transparency, large specific surface area, and good electrical conductivity, is expected to perform as an excellent medium in the field of optical fiber biosensing. Here, we fabricated double S-tapered fiber sensors functionalized with gold nanoparticles/graphene oxide/tyrosinase (AuNPs/GO/tyrosinase) and AuNPs/Nb2CTx/tyrosinase, respectively. The double S-tapered structure can provide more evanescent wave leakage and enhance light–matter interaction. By implementing transmittance experiment, the sensitivity of the two probes were tested to be 17 and 34 pm/ μM over 0–300 μM tyramine concentrations. The comparative results demonstrate that Nb2CTx-enhanced localized surface plasmon resonance (LSPR) sensor has more excellent performance due to the existence of surface functional groups and large specific surface area of Nb2CTx. Our work provides a research platform for improving the sensitivity of LSPR sensors.

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Qian, Siyu, Xinlong Chen, Shiyu Jiang, Qiwen Pan, Yachen Gao, Lei Wang, Wei Peng, Shanjun Liang, Jie Zhu y Shengchun Liu. "Direct detection of charge and discharge process in supercapacitor by fiber-optic LSPR sensors". Nanophotonics 9, n.º 5 (22 de febrero de 2020): 1071–79. http://dx.doi.org/10.1515/nanoph-2019-0504.

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AbstractSupercapacitors with high power density, ultralong lifespan and wide range operating temperature have drawn significant attention in recent years. However, monitoring the state of charge in supercapacitors in a cost-effective and flexible way is still challenging. Techniques such as transmission electron microscopy and X-ray diffraction can analyze the characteristics of supercapacitor well. But with large size and high price, they are not suitable for daily monitoring of the supercapacitors’ operation. In this paper, a low cost and easily fabricated fiber-optic localized surface plasmon resonance (LSPR) probe is proposed to monitor the state of charge of the electrode in a supercapacitor. The Au nanoparticles were loading on the fiber core as LSPR sensing region. In order to implant the fiber in the supercapacitor, a reflective type of fiber sensor was used. The results show that this tiny fiber-optic LSPR sensor can provide online monitoring of the state of charge during the charging and discharging process in situ. The intensity shift in LSPR sensor has a good linear relationship with the state of charge calculated by standard galvanostatic charging and discharging test. In addition, this LSPR sensor is insensitive to the temperature change, presenting a great potential in practical applications.

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Tesis sobre el tema "LSPR sensors"

Stone, Edmund K. "Semiconductor surface plasmons : a route to terahertz waveguides and sensors". Thesis, University of Exeter, 2012. http://hdl.handle.net/10036/3582.

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The terahertz regime has until recently been some what neglected due to the difficulty of generating and measuring terahertz radiation. Terahertz time domain spectroscopy has allowed for affordable and broadband probing of this frequency regime with phase sensitive measurements (chapter 3). This thesis aims to use this tool to add to the knowledge of the interactions between electromagnetic radiation and matter specifically in regard to plasmonics. This thesis covers several distinct phenomena related to plasmonics at terahertz frequencies. The generation of terahertz radiation from metal nanoparticles is first described in chapter 4. It is shown that the field strength of the plasmon appears to relate to the strength of the generated field. It is also shown that the power dependence of the generated terahertz radiation is not consistent with the optical rectification description of this phenomenon. An alternative explanation is developed which appears more consistent with the observations. A simple model for the power dependence is derived and compared to the experimental results. In chapter 5 the parameters that make good plasmonic materials are discussed. These parameters are used to assess the suitability of semiconductors for terahertz surface plasmon experiments. The Drude permittivity of InSb is measured here, leading to a discussion of terahertz particle plasmons in chapter 6. Finite element method modelling is used to show some merits of these over optical particle plasmons. This also includes a discussion of fabrication methods for arrays of these particles. Finally, chapter 7 is a discussion of so called spoof surface plasmons. This includes some experimental work at microwave frequencies and an in depth analysis of open ended square hole arrays supported by model matching method modelling. Perfect endoscope effects are discussed and compared to superlensing. The thesis ends with a brief conclusions chapter where some of the ideas presented are brought together.

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Watkins, William L. "Study and development of localised surface plasmon resonance based sensors using anisotropic spectroscopy". Electronic Thesis or Diss., Sorbonne université, 2018. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2018SORUS505.pdf.

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La résonance de plasmon de surface localisée (LSPR) est définie comme l’oscillation collective du nuage d’électrons de conduction induite par un champ électrique externe. Dans le cas de nanoparticules composé de métaux nobles tels que l’or, l’argent, ou le cuivre,la résonance est localisée dans le visible ou le proche UV. La polarisabilité d’une nanoparticule est directement proportionnelle à quatre paramètres clefs : son volume, sa composition, sa forme et son milieu environnant. Ce sont ces propriétés qui font que la LSPR peut être utilisée à des fin de capteur. Dans le cas d’une particule isotrope, tel que la sphère, le spectre LSPR montre un seul pic d’absorption. Dans le cas d’une particule anisotrope, tel qu’une ellipsoïde, le spectre d’absorption a deux maxima distincts. Si on calcule la section efficace d’absorption en considérant une lumière non polarisée, on obtient deux maxima. Le point clef de ce type de système est la possibilité de découpler les deux résonances en utilisant une lumière polarisée. Dans cette description le système anisotrope est considéré comme microscopique, c’est à dire qu’il ne s’agit que d’une ou deux particules. Dans le cas d’un échantillon macroscopique, tel qu’une solution colloïdale d’ellipsoïdes ou nanotiges, le spectre d’absorption aura toujours deux maxima d’absorption, mais ceux-ci ne pourront pas être découplés car l’échantillon n’est pas globalement anisotrope. En revanche, si l’échantillon présente une anisotropie globale telle que des nanotiges alignés, ou des nanosphères organisées en ligne, il est possible d’avoir un spectre de plasmon dépendant de la polarisation de la lumière. Être capable de découpler les résonances d’un échantillon anisotrope permet de mesurer un spectre différentiel en prenant la différence des deux spectres d’absorption. Cela est expérimentalement possible en utilisant la spectroscopie de transmis- sion anisotrope qui permet la mesure de l’anisotropie optique. L’avantage est d’obtenir un spectre relative et différentiel donc plus stable et reproductible. De plus il est maintenant possible de suivre l’évolution de la réponse optique des particules plasmoniques, non plus en mesurant un déplacement spectral, mais en mesurant le changement d’intensité du signal à une longueur d’onde fixe. Cette méthode est utilisée pour deux cas d’études qui sont la mesure de l’interaction du dihydrogène avec des nanoparticules d’or, ainsi que la détection de faible pression partielle de dihydrogène dans un gaz porteur (argon, et air) à l’aide de palladium, pour des applications de capteur d’hydrogène
Localised surface plasmon resonance (LSPR) is defined as the collective oscillation of the conduction electron cloud induced by an external electric field. In the case of nanoparticles composed of noble metals such as gold, silver, or copper, the resonance is located in the visible or near UV range. The polarisability of a nanoparticle is directly proportional to four key parameters: its volume, its composition, its shape and its surrounding environment. It is these properties that make LSPR useful for sensor applications. In the case of isotropic particles, such as spheres, the LSPR spectrum shows only one absorption peak. In the case of an anisotropic particle, such as an ellipsoid, the absorption spectrum has two or more distinct peaks. If the absorption cross-section is measured with unpolarised light, multiple maxima are obtained. The key point for these type of systems is the possibility to decouple the resonances using polarised light. In this description the anisotropic system is considered microscopic, i.e. it is only made of one or two particles. In the case of a macroscopic sample, such as a colloidal solution of ellipsoids or nanorods, the absorption spectrum will always have multiple absorption maxima, and they cannot be decoupled because the sample is not globally anisotropic.On the other hand, if the sample has a global anisotropy such as aligned nanorods, or nanosphere organised in lines, it is possible to have a plasmon spectrum dependent on the light polarisation. Being able to decouple the resonances of an anisotropic sample makes it possible to measure a differential spectrum by taking the difference of the two absorption spectra. This is experimentally possible by using anisotropic transmission spectroscopy which measures the optical anisotropy. The advantage is to obtain a relative and differential spectrum more stable and reproducible. Moreover, it is now possible to follow the evolution of the optical response of the plasmonic particles no longer by measuring a spectral shift but by measuring the change in intensity of the signal at a fixed wavelength. This method is used on two case studies which are the measurement of the interaction of dihydrogen with gold nanoparticles, as well as the detection of low partial pressure of dihydrogen in a carrier gas (argon, and air) using palladium nanoparticles, for hydrogen sensing applications

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Kaya, Zeynep. "Controlled and localized synthesis of molecularly imprinted polymers for chemical sensors". Thesis, Compiègne, 2015. http://www.theses.fr/2015COMP2220.

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Les polymères à empreintes moléculaires (MIP), également appelés "anticorps en plastique", sont des récepteurs biomimétiques synthétiques qui sont capables de reconnaître et lier une molécule cible avec une affinité et une spécificité comparables à celles des récepteurs naturels tels que des enzymes ou des anticorps. En effet, les MIP sont utilisés comme éléments de reconnaissance synthétiques dans les biocapteurs et biopuces pour la détection de petits analytes et les protéines. La technique d'impression moléculaire est basée sur la formation de cavités de reconnaissance spécifiques dans des matrices polymères par un procédé de moulage à l'échelle moléculaire. Pour la conception de capteurs et biopuces, une cinétique d'adsorption et une réponse du capteur rapide, l'intégration des polymères avec des transducteurs, et une haute sensibilité de détection sont parmi les principaux défis. Dans cette thèse, ces problèmes ont été abordés par le développement de nanocomposites MIP / d'or via le greffage du MIP sur les surfaces en utilisant des techniques de polymérisation dédiées comme l'ATRP qui est une technique de polymérisation radicalaire contrôlée (CRP). Ces techniques CRP sophistiquées sont en mesure d'améliorer considérablement les matériaux polymères. L'utilisation de l'ATRP dans le domaine de MIP a été limitée jusqu'à présent en raison de son incompatibilité inhérente avec des monomères acides comme l'acide méthacrylique (MAA), qui est de loin le monomère fonctionnel le plus largement utilisé dans les MIP. Ici, un nouveau procédé est décrit pour la synthèse de MIP par ATRP photo-initiée utilisant fac-[Ir(Ppy)3] comme catalyseur. La synthèse est possible à température ambiante et est compatible avec des monomères acides. Cette étude élargit considérablement la gamme de monomères fonctionnels et de molécules empreintes qui peuvent être utilisés lors de la synthèse de MIP par ATRP. La méthode proposée a été utilisée pour la fabrication de nanocomposites hiérarchiquement organisés sur des surfaces métalliques nanostructurés avec des nano-trous et nano-ilots, présentant des effets plasmoniques pour l'amplification du signal. La synthèse de films de MIP à l'échelle du nanomètre localisés sur la surface d'or a été démontrée. Des méthodes de transduction optiques, à savoir la résonance de plasmons de surface localisée (LSPR) et la spectroscopie Raman exaltée par effet de surface (SERS) ont été exploitées. Ces techniques se sont montrées prometteuses pour l'amélioration de la limite de détection dans la détection d'analytes biologiquement pertinents, y compris les protéines et le médicament propranolol
Molecularly imprinted polymers (MIPs), also referred to as plastic antibodies, are synthetic biomimetic receptors that are able to bind target molecules with similar affinity and specificity as natural receptors such as enzymes or antibodies. Indeed, MIPs are used as synthetic recognition elements in biosensors and biochips for the detection of small analytes and proteins. The molecular imprinting technique is based on the formation of specific recognition cavities in polymer matrices by a templating process at the molecular level. For sensor and biochip development, fast binding kinetics of the MIP for a rapid sensor response, the integration of the polymers with transducers, and a high sensitivity of detection are among the main challenges. In this thesis, the above issues are addressed by developing MIP/gold nanocomposites by grafting MIPs on surfaces, using dedicated techniques like atom transfer radical polymerization (ATRP) which is a versatile controlled radical polymerization (CRP) technique. Theses ophisticated CRP techniques, are able to greatly improve the polymeric materials. The use of ATRP in the MIP field has been limited so far due to its inherent incompatibility with acidic monomers like methacrylic acid (MAA), which is by far the most widely used functional monomer. Herein, a new method is described for the MIP synthesis through photo-initiated ATRP using fac-[Ir(ppy)3] as ATRP catalyst. The synthesis is possible at room temperature and is compatible with acidic monomers. This study considerably widens the range of functional monomers and thus molecular templates that can be used when MIPs are synthesized by ATRP. The proposed method was used for fabrication of hierarchically organised nanocomposites based on MIPs and nanostructured metal surfaces containing nanoholes or nanoislands, exhibiting plasmonic effects for signal amplification. The fabrication of nanometer scale MIP coatings localized on gold surface was demonstrated. Optical transduction methods, namely Localized Surface Plasmon Resonance (LSPR) and Surface Enhanced Raman Spectroscopy (SERS) were exploited and shown that they hold great promise for enhancing the limit of detection in sensing of biologically relevant analytes including proteins and the drug propranolol

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Schenström, Karl. "Biofunctionalization of a Fiber Optics-Based LSPR Sensor". Thesis, Linköpings universitet, Molekylär fysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-125726.

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When exposed to light, metal nanoparticles exhibit a phenomenon known as LSPR, Localized Surface Plasmon Resonance. The wavelengths at which LSPR occurs is very dependent on the refractive index of the surrounding medium. Binding of biomolecules to the surface of gold nanoparticles result in a change in the refractive index that can be detected spectrophotometrically by monitoring the LSPR peak shift. When functionalized with the corresponding ligand(s), gold nanoparticles can be utilized in biosensors to detect the presence and concentration of a predetermined analyte. However, the system must exhibit high specificity and give rise to a detectable shift for analytes in the desired concentration range to be of commercial interest. The aim of the diploma project was to investigate and optimize the biofunctionalization and performance of a fiber optics based LSPR biosensor. Three ligand systems were investigated for detection of antibodies (IgG), insulin and avidin. Binding of the analyte to the ligand caused a shift of a few nanometers when using spherical gold nanoparticles. The shifts were significantly larger when using gold nanorods. When using the IgG and insulin ligands, only minor unspecific binding was observed. The setup thus shows great potential for use in a wide range of sensing applications.

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ANDRADE, Arnaldo César Dantas dos Santos. "Desenvolvimento de Dispositivo Eletrônico e Sensor Plasmônico para Detecção de Glicose". Universidade Federal de Pernambuco, 2013. https://repositorio.ufpe.br/handle/123456789/12213.

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Um dispositivo eletrônico para teste laboratorial remoto ou point-of-care testing (POCT) foi desenvolvido para detecção de glicose, sendo três as suas unidades estruturais: a fonte de luz, o sensor plasmônico e o transdutor de sinal. Após testes na primeira unidade estrutural do instrumento, optou-se por fonte de luz do tipo laser de ondas contínuas, trabalhando no comprimento de onda 780 nm. A segunda unidade estrutural é resultante de técnicas de engenharia molecular e síntese coloidal de um sensor plasmônico, estável, consumível em única dose. Funcionalizou-se a superfície dos nanobastões de ouro (NBAu), revestindo-os com polieletrólitos e em seguida conjugou-se com enzima glicose oxidase (GO) em camadas, pelo método layer-by-layer (LBL). As camadas foram caracterizadas por espectroscopia UVVis- NIR e obteve-se uma relação qualitativa entre estas e seus respectivos espectros de ressonância localizada de plasmon de superfície (LSPR). A LSPR possibilita uma ampla variedade de aplicações em dispositivos sensores baseados neste fenômeno. Os NBAu sintetizados neste trabalho apresentaram dois modos de absorção: (i) 550 nm o qual corresponde ao modo de oscilação transversal e (ii) 744 nm para o modo de oscilação longitudinal e sua morfologia foi obtida por microscopia eletrônica de transmissão (MET). Foi possível investigar a estabilidade de nanobastões funcionalizados com concentrações de poliestirenosulfonato de sódio (PSS). O sensor plasmônico NBAu-PSS-Poliacrilamida(PAM)- GO distinguiu absorções para soluções de concentrações distintas de glicose. Para a terceira unidade estrutural do instrumento foram selecionados transdutores de sinal e desenvolveu-se uma abordagem experimental que permitiu defini-los e programá-los a fim de reproduzir respostas correspondentes àquelas de analisadores convencionais. Um analisador de modulações LSPR foi programado no dispositivo eletrônico e ocorreu em conjunto com a síntese das nanoestruturas. A especificação do emissor de luz, a construção do sensor NBAu- PSS-PAM-GO e a definição do transdutor de sinal, permitiram elaborar uma instrumentação prática para a diagnóstico rápido. Este trabalho veio reforçar a importância da aplicação de nanoestruturas anisotrópicas para reconhecimento de macromoléculas. Uma estratégia semelhante foi contemplada neste mesmo dispositivo eletrônico, demonstrada em anticorpos conjugados aos nanobastões para reconhecimento da proteína troponina, como prova de conceito.

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Tu, Minh Hieu. "Investigation of metal nanomaterials as a sensing element in LSPR-based optical fibre sensor development". Thesis, City University London, 2014. http://openaccess.city.ac.uk/5919/.

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This thesis aims to explore and demonstrate the potential of using optical fibres both as a waveguide material and a transducer for wide sensing applications, based on a comprehensive review of the localised surface plasmon resonance (LSPR) phenomenon, which occurs at a nanoscale level when light interacts with metallic nanoparticles at a resonance wavelength. The LSPR effect of metallic nanomaterials has shown a strong dependence on the local surrounding environment. A small change for example in the refractive index or in the solution concentration can result in a variation in the LSPR spectrum. Based on this underpinning sensing mechanism, a portable system using an optical fibre coated with gold nanoparticles (AuNPs) as a sensing probe has been developed and tested for the refractive index measurement. Coupled with this, a systematic approach has been developed and applied in this work to optimize the performance of the developed system by considering several key factors, such as the size of nanoparticles produced, pH, coating time and coating temperature. The above optimised probes coated with gold-nanoparticles are further cross-compared with those optimized but coated with gold nanorods with a high aspect ratio. Both types of probes are also prepared for a specific biosensing application based on the antibody-antigen interaction to create wavelength-based sensors for the detection of anti-human IgG. Both probes have exhibited excellent refractive index (RI) sensitivity, showing ~914 nm/RIU (refractive index unit) for the probe coated with gold nanoparticles and ~601 nm/RIU for the one coated with gold nanorods. When using the modified probes for the detection of anti-human IgG, both probes are able to achieve a good LOD (limit of detection) at 1.6 nM. Based on the above cross-comparison, further research has been undertaken to explore the potential of nanoparticles of the alloy of gold and silver, with an aim to combine the robustness of gold and the excellent LSPR effect of silver. To do so, various alloy particles with varied gold/silver ratio and sizes have been prepared and tested for their respective refractive index sensitivities. The probe coated with alloy particles with bigger size and higher silver content has shown better performance in RI sensing. The work has shown a clear relationship between the size of alloys, the content ratio of alloys and RI sensitivity. Research has also been undertaken in this thesis to explore the excellent LSPR effect of hollow nanoparticles resulting from the enhanced coupling between the interior and exterior of the hollow particles. Gold hollow nanocages have been successfully synthesised and tested with different hollowness and a LSPR sensor coated with gold nanocages has shown an excellent sensitivity as high as ~1933 nm/RIU, which is more than 3 times higher than that coated with AuNPs. This result has confirmed that a significant improvement in sensitivity can be made possible for further biosensing as well as chemical sensing applications.

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Han, Cheng-Yu. "Clock Synchronization and Localization for Wireless Sensor Network". Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS453/document.

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Les réseaux de capteurs sans fil (WSN) jouent un rôle important dans des applications telles que la surveillance de l'environnement, le suivi de sources et le suivi médical, ...etc. Dans les WSN, les capteurs ont la capacité d'effectuer l'échantillonnage des données, des calculs distribués et de fusionner des données. Pour effectuer ces tâches complexes, la synchronisation des horloges et la localisation sont fondamentales et essentielles. Les WSN ont été largement étudiés ces dernières années et la littérature scientifique rapporte de nombreux résultats qui les rendent applicables pour de nombreuses applications. Pour d'autres, la recherche doit encore trouver des solutions à certains des défis posés par la limitation énergétique, la dynamicité et la faible puissance de calcul. Dans le but de contribuer à la recherche sur les WSN, cette thèse propose de nouveaux algorithmes pour la synchronisation d'horloge et la localisation. La synchronisation d'horloge est nécessaire afin que les effectuent de manière efficace la fusion de données. En appliquant l'algorithme de synchronisation d'horloge, les capteurs établissent un consensus temporel et travaillent donc au même rythme. Compte tenu de la dynamicité, des faibles capacités de calcul et de la parcimonie des WSN, un nouvel algorithme de synchronisation décentralisée à impulsions couplées est proposé pour améliorer la précision de la synchronisation. L'avantage de ce type d'algorithme est que les capteurs échangent des impulsions au lieu de paquets, de sorte que non seulement la communication est efficace, mais aussi robuste à toute défaillance des capteurs dans le réseau. La localisation de capteurs a été largement étudiée dans la littérature scientifique. Cependant, la qualité et la précision de la localisation peuvent encore être améliore. Cette thèse applique l'algorithme LSCR (Régression de régions corrélées à signes dominants) au problème de localisation. Avec LSCR, on évalue des régions de confiance avec des niveaux de confiance prescrits, qui fournissent non seulement on emplacement mais aussi la confiance en cet emplacement. Dans cette thèse, plusieurs approches de localisation sont implémentées et comparées. Le résultat de la simulation montre que, sous hypothèses modérées, LSCR obtient des résultats compétitifs par rapport à d'autres méthodes
Wireless sensor networks (WSNs) play an important role in applications such as environmental monitoring, source tracking, and health care,... In WSN, sensors have the ability to perform data sampling, distributed computing and information fusion. To perform such complex tasks, clock synchronization and localization are two fundamental and essential algorithms. WSNs have been widely studied in the past years, and the scientific literature reports many outcomes that make them applicable for some applications. For some others, research still needs to find solutions to some of the challenges posed by battery limitation, dynamicity, and low computing clock rate. With the aim of contributing to the research on WSN, this thesis proposes new algorithms for both clock synchronization and localization. For clock synchronization, sensors converge their local physical clock to perform data fusion. By applying the clock synchronization algorithm, sensors converge the time difference and therefore work at the same rate. In view of dynamicity, low computing and sparsity of WSN, a new pulse-coupled decentralized synchronization algorithm is proposed to improve the precision of the synchronization. The benefit of this kind of algorithm is that sensors only exchange zero-bit pulse instead of packets, so not only the communication is efficient but also robust to any failure of the sensors in the network. Localization of sensors has been widely studied. However, the quality and the accuracy of the localization still have a large room to improve. This thesis apply Leave-out Sign-dominant Correlated Regions (LSCR) algorithm to localization problem. With LSCR, one evaluates the accurate estimates of confidence regions with prescribed confidence levels, which provide not only the location but also the confidence of the estimation. In this thesis, several localization approaches are implemented and compared. The simulation result shows under mild assumptions, LSCR obtains competitive results compared to other methods

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Berlangieri, Chiara. "Nanostructured gels and sensors for preventive and sustainable conservation of works of art". Doctoral thesis, 2018. http://hdl.handle.net/2158/1130733.

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The aim of this project is to study, from different points of view, the potentiality of new technologies in the field of the diagnostic, restoration and conservation of cultural heritage. In particular soft matters and LSPR sensing are the main topics of this work. The objectives of this work can be summarized as follow: 1. Development and characterization of an aqueous soft system containing hydroxypropyl guar crosslinked by borax, with the addition of glycerol as plasticizer, having potential applications in the cleaning of artistic surfaces; 2. Assessment of the efficacy of recently developed highly viscous dispersions in the removal of a gypsum degradation patina from carbonatic stones, after the embedding with chelating agents; 3. Development of a smart and cheap LSPR sensor, exploring the tunability of gold nanostructures at a PDMS surface through a double-growth approach.

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李宗諺. "Optical tapered filber sensor based on localized surface plasmon resonance (LSR)". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/88680320717973303119.

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Capítulos de libros sobre el tema "LSPR sensors"

Otte, Marinus A. y Borja Sepulveda. "Figures of Merit for Refractometric LSPR Biosensing". En Nanoplasmonic Sensors, 317–31. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-3933-2_13.

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Bingham, Julia M., W. Paige Hall y Richard P. Van Duyne. "Exploring the Unique Characteristics of LSPR Biosensing". En Nanoplasmonic Sensors, 29–58. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-3933-2_2.

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Vestergaard, Mun’delanji C., Masato Saito, Hiroyuki Yoshikawa y Eiichi Tamiya. "Gold Nanostructure LSPR-Based Biosensors for Biomedical Diagnosis". En Springer Series on Chemical Sensors and Biosensors, 171–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/5346_2012_50.

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Vaskevich, Alexander y Israel Rubinstein. "Localized Surface Plasmon Resonance (LSPR) Transducers Based on Random Evaporated Gold Island Films: Properties and Sensing Applications". En Nanoplasmonic Sensors, 333–68. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-3933-2_14.

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Wilks, Yorick. "Senses and texts". En Terminology, LSP and Translation, 205. Amsterdam: John Benjamins Publishing Company, 1996. http://dx.doi.org/10.1075/btl.18.20wil.

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Kumar, Santosh, Niteshkumar Agrawal, Chinmoy Saha y Rajan Jha. "Graphene Oxide Coated Gold Nanoparticles-Based Fiber-Optic LSPR Sensor". En Optical Fiber-based Plasmonic Biosensors, 131–65. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003243199-6.

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Kumar, Santosh, Niteshkumar Agrawal, Chinmoy Saha y Rajan Jha. "Fiber-Optic LSPR Sensor Using Graphene Oxide Coated Silver Nanostructures". En Optical Fiber-based Plasmonic Biosensors, 167–95. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003243199-7.

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Saison, Ophélie, Gaëtan Lévêque y Abdellatif Akjouj. "LSPR in Plasmonic Nanostructures: Theoretical Study with Application to Sensor Design". En Encyclopedia of Nanotechnology, 1–8. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-007-6178-0_100985-1.

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Saison, Ophélie, Gaëtan Lévêque y Abdellatif Akjouj. "LSPR in Plasmonic Nanostructures: Theoretical Study with Application to Sensor Design". En Encyclopedia of Nanotechnology, 1819–26. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-017-9780-1_100985.

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Jeong, Wang-Boo, Dong-Won Park y Young-Ho Sohn. "Optimization of LSPL Algorithm for Data Transfer in Sensor Networks Based on LEACH". En Advances in Computer Science and Ubiquitous Computing, 789–96. Singapore: Springer Singapore, 2015. http://dx.doi.org/10.1007/978-981-10-0281-6_111.

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Actas de conferencias sobre el tema "LSPR sensors"

Larsen, Steven y Yiping Zhao. "Improving the performance of LSPR sensors by composite plasmonic nanostructures". En Optical Sensors. Washington, D.C.: OSA, 2019. http://dx.doi.org/10.1364/sensors.2019.sw5d.3.

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Gouvêa, Paula M. P., Isabel C. S. Carvalho, Hoon Jang, Marco Cremona, Arthur M. B. Braga y Michael Fokine. "Characterization of a Fiber Optic Sensor Based on LSPR and Specular Reflection". En Optical Sensors. Washington, D.C.: OSA, 2010. http://dx.doi.org/10.1364/sensors.2010.stua4.

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Sae-Wan Kim, Seung-Hwan Cha, Byoung-Ho Kang, Sang-Won Lee, Jae-Sung Lee, Ju-Seong Kim, Gopalan Sai-Anand y Shon-Won Kang. "Optical gas sensor based on LSPR using ZnO nanoparticles and AAO nanostructure". En 2015 IEEE Sensors. IEEE, 2015. http://dx.doi.org/10.1109/icsens.2015.7370399.

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Al-Rubaye, Ali, Alexei Nabok, Hisham Abu-Ali, Andras Szekacs y Ester Takacs. "LSPR/TIRE bio-sensing platform for detection of low molecular weight toxins". En 2017 IEEE SENSORS. IEEE, 2017. http://dx.doi.org/10.1109/icsens.2017.8234116.

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Kusuda, Yasuhiro, Zhongyuan Yang, Takaaki Soeda, Fumihiro Sassa y Kenshi Hayashi. "Invisible Odor Trace Tracking with LSPR based High Speed Gas Sensor Robot System". En 2019 IEEE SENSORS. IEEE, 2019. http://dx.doi.org/10.1109/sensors43011.2019.8956599.

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Gouvêa, Paula M. P., Dario P. Parra, Arthur M. B. Braga y Isabel C. S. Carvalho. "Chemical sensing with an all-fiber reflection LSPR sensor". En 21st International Conference on Optical Fibre Sensors (OFS21). SPIE, 2011. http://dx.doi.org/10.1117/12.886006.

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Semasa, Kohei, Fumihiro Sassa y Kenshi Hayashi. "2D LSPR gas sensor with Au/Ag core-shell structure coated by fluorescent dyes". En 2020 IEEE SENSORS. IEEE, 2020. http://dx.doi.org/10.1109/sensors47125.2020.9278828.

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Soeda, Takaaki, Zhongyuan Yang, Fumihiro Sassa, Yoichi Tomiura y Kenshi Hayashi. "2D LSPR multi gas sensor array with 4-segmented subpixel using Au/Ag core shell structure". En 2019 IEEE SENSORS. IEEE, 2019. http://dx.doi.org/10.1109/sensors43011.2019.8956635.

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Sawada, Arata, Fumihiro Sassa y Kenshi Hayashi. "Estimation of Distributed Concentration of Mixed Gases Using Au/Ag Core-Shell 2D LSPR Gas Sensor". En 2021 IEEE Sensors. IEEE, 2021. http://dx.doi.org/10.1109/sensors47087.2021.9639593.

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Zhou, Cheng y Jian-quan Yao. "Photonic crystal fiber-based silver-nanowires LSPR sensors with supermodes". En OFS2012 22nd International Conference on Optical Fiber Sensor, editado por Yanbiao Liao, Wei Jin, David D. Sampson, Ryozo Yamauchi, Youngjoo Chung, Kentaro Nakamura y Yunjiang Rao. SPIE, 2012. http://dx.doi.org/10.1117/12.974901.

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