Article
Chemistry, Multidisciplinary
Robin R. Jones, Cornelia Miksch, Hyunah Kwon, Coosje Pothoven, Kristina R. Rusimova, Maarten Kamp, Kedong Gong, Liwu Zhang, Tim Batten, Brian Smith, Alejandro V. Silhanek, Peer Fischer, Daniel Wolverson, Ventsislav K. Valev
Summary: Against the backdrop of current healthcare and climate emergencies, surface enhanced Raman scattering (SERS) is gaining popularity as a technique for identifying and fingerprinting molecules in various substances. Researchers have investigated plasmonic nanohelices and found that they possess excellent SERS properties. These nanohelices can be produced at a low cost, exhibit strong and uniform Raman enhancement effects, and are anticipated to have broad applications in surface enhanced Raman spectroscopies and material science.
ADVANCED MATERIALS
(2023)
Article
Biochemical Research Methods
Kessia Nattaly Oliveira dos Santos, Monica Benicia Mamian-Lopez
Summary: Optical sensors can detect various substances, from biological samples to hazardous substances. In this study, a colorimetric nanoantenna sensor using gold nanoparticles embedded in poly(vinyl alcohol) and decorated with a dye was constructed. The sensor demonstrated potential reusability and was used to visually detect H2O2 with a smartphone-based app. Chemometric modeling of the app data allowed for a detection limit of 0.0058% of H2O2 and visual observation of sensor changes, supporting the combination of nanoantenna sensors with chemometric tools for sensor design. This approach has the potential to enable visual detection and colorimetric quantification of analytes in complex samples.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Meitong Nie, Yuming Zhao, Wonil Nam, Junyeob Song, Wenqi Zhu, Henri J. Lezec, Amit Agrawal, Wei Zhou
Summary: The research introduces nanolaminate plasmonic nanocavities on 3D vertical nanopillar arrays for broadband SERS operation with large enhancement factors. It shows uniform SERS performance and demonstrates nanoscale broadband SERS operation at the single MIM nanocavity level. Numerical studies reveal that the nanolaminate plasmonic nanocavities can support multiple hybridized plasmonic modes for concentrating optical fields across a broadband wavelength range.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Kirill Khabarov, Emiliia Filalova, Messan Nouraldeen, Ekaterina Kameneva, Andrey Musaev, Sergei Tikhonov, Victor Ivanov
Summary: In this study, the influence of agglomeration degree of nanoparticles on the signal enhancement of surface-enhanced Raman spectroscopy (SERS) was investigated. It was found that structures formed mainly from non-agglomerated nanoparticles can enhance the SERS signal better. Aerosol nanoparticles modified by pulsed laser radiation show better results compared to thermally modified nanoparticles.
Article
Chemistry, Physical
Hanna J. Koster, Tatu Rojalin, Randy P. Carney, Hannah J. O'Toole, Kwan Lun Chiu
Summary: Surface enhanced Raman scattering (SERS) is a powerful tool for vibrational spectroscopy that enhances chemical sensitivity by several orders of magnitude compared to spontaneous Raman scattering. However, synthesizing robust and uniform SERS substrates quickly and easily remains a challenge.
COLLOID AND INTERFACE SCIENCE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Parmeet Dhindsa, David Solti, Christian R. Jacobson, Anvy Kuriakose, Gopal Narmada Naidu, Aaron Bayles, Yigao Yuan, Peter Nordlander, Naomi J. Halas
Summary: This study provides direct insight into the role of catalyst molecular structure in controlling the morphology of aluminum nanocrystals (Al NCs) by systematically modifying the catalyst molecular structure.
Article
Biotechnology & Applied Microbiology
Sihai Luo, Junjie Zhang, John C. de Mello
Summary: This study demonstrates the use of thin gold films patterned with nanogaps for the sensitive detection of micro- and nano-plastics. The detection and identification of these contaminants is critical for monitoring their spread and effects in the environment.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2023)
Article
Chemistry, Analytical
Kedong Gong, Robin Raffe Jones, Kejian Li, Guanjun Xu, Hanyun Cheng, Yiqing Feng, Ventsislav Kolev Valev, Liwu Zhang
Summary: The study developed a method to directly measure the pH of microdroplets using Surface Enhanced Raman Scattering technology. It establishes the relationship between microdroplet size and pH value, and showcases the potential application in environmental samples.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Multidisciplinary
Jean-Francois Bryche, Marlo Vega, Agnes Tempez, Thibault Brule, Thomas Carlier, Julien Moreau, Marc Chaigneau, Paul G. Charette, Michael Canva
Summary: This work demonstrates the enhancement in plasmonic sensing efficacy by spatially-localized functionalization on nanostructured surfaces, where probe molecules are concentrated in areas of high field concentration. SERS measurements on nanostructured surfaces with homogeneous and spatially-localized functionalization with thiophenol show that the Raman signal mainly originates from high field concentration areas. TERS measurements with 10 nm spatial resolution confirm the predicted field distribution profiles.
Review
Chemistry, Analytical
Irene Calderon, Luca Guerrini, Ramon A. Alvarez-Puebla
Summary: Surface-enhanced Raman spectroscopy (SERS) combines nanotechnology with traditional Raman spectroscopy to create an ultra-sensitive and highly specific analytical tool, utilized in various advanced applications such as biosensing platforms for nucleic acids (NAs) and precision engineering of nanomaterials using structural DNA nanotechnology.
Article
Chemistry, Multidisciplinary
Aditya Garg, Elieser Mejia, Wonil Nam, Meitong Nie, Wei Wang, Peter Vikesland, Wei Zhou
Summary: Scalable nanofabrication of microporous multiresonant plasmonic meshes (MMPMs) is achieved via a hierarchical micro-/nanoimprint lithography approach. These meshes demonstrate broadband nonlinear nanoplasmonic enhancement and can be used as bio-interfaced surface-enhanced Raman spectroscopy sensors.
Article
Nanoscience & Nanotechnology
Yanlin Mi, Yinzhou Yan, Mengyuan Wang, Lixue Yang, Jing He, Yijian Jiang
Summary: Researchers have reported a novel hybrid SERS substrate composed of a large microsphere and a small microsphere array with Ag nanoparticles. The cascaded structure allows for increased molecular concentration, enhanced intensity of excitation light, and giant Raman enhancement.
Article
Chemistry, Multidisciplinary
Hajir Hilal, Mohammadnavid Haddadnezhad, Myeong Jin Oh, Insub Jung, Sungho Park
Summary: Elongated pseudohollow nanoframes composed of four rectangular plates enclosing the sides and two open-frame ends with four ridges pointing at the tips for near-field focusing are reported. The nanoframes are hollow inside, allowing the gaseous analyte to penetrate through the entire architecture and enabling efficient detection of gaseous analytes when combined with Raman spectroscopy. The significant enhancement in SERS is attributed to the presence of a flat solid terrace for a large surface area, sharp edges and vertices for strong electromagnetic near-field collection, and open frames for effective analyte transport and capture.
Article
Chemistry, Physical
Tiago Fernandes, Sara Fateixa, Marta Ferro, Helena I. S. Nogueira, Ana L. Daniel-da-Silva, Tito Trindade
Summary: The use of dendrimers in the controlled synthesis of Ag:Au hybrid nanostructures enhances SERS sensitivity to organic pollutants. Dendrimers play a crucial role as multipurpose ligands in the formation of hybrid nanostructures, improving stability and sensitivity. Interparticle plasmonic coupling templated by dendrimer macromolecules contributes to the high SERS sensitivity of the hybrid nanostructures.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Physical
Jie Zheng, Xianchao Liu, Mingyang Tian, Yarong Su, Ling Li
Summary: In this study, wafer-scale hybrid metal-dielectric gratings (HMDGs) consisting of aluminum and silicon (Al-Si) have been successfully fabricated as UV-SERS substrates to reduce ohmic dissipation and elevate the detection performance. Well-defined HMDG substrates exhibit tunable hybrid resonant modes in the UV and the visible regions. The proposed HMDG nanostructures have a great advantage in detecting important biomolecules as UV-SERS substrates, achieving a higher detection performance compared to conventional aluminum (Al) plasmonic nanostructures.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Victor F. Martin, Luis Landesa, Fernando Obelleiro, Jose M. Taboada
Summary: This research presents a novel discontinuous Galerkin surface integral equation approach for the electromagnetic analysis of arbitrarily shaped piecewise homogeneous objects. The proposed method can handle nonoverlapping boundary surfaces and interfaces between materials independently, utilizing nonconformal meshes for improved flexibility. The study demonstrates the accuracy and versatility of the proposed approach in managing and solving complex composite objects with junctions.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Computer Science, Information Systems
Diego M. Solis, Victor F. Martin, Jose M. Taboada, Francesca Vipiana
Summary: In this work, a hierarchic multiresolution preconditioner is combined with the multilevel fast multipole algorithm-fast Fourier transform (MLFMA-FFT) and efficiently parallelized in multicore computers for electromagnetic scattering and radiation problems. The proposed approach accurately handles multi-scale mesh features by using thin-dielectric-sheet approximation for thin materials and electric and combined field integral equations for conducting objects. The parallel MLFMA-FFT with MR hierarchical functions and algebraic incomplete LU decomposition preconditioner significantly improves the solution efficiency and precision for realistic multi-scale scattering and radiation problems.
Article
Physics, Applied
Diego M. Solis, Nader Engheta
Summary: We propose a new type of bilayered silicon-photonics subwavelength device that incorporates an indium tin oxide (ITO) thin film to enhance nonlinearity-assisted and ultrafast nonreciprocal behavior. By optimizing the excitation method and frequency mode, we are able to achieve notable nonreciprocal performance in an ultracompact element. Numerical simulations validate our predictions.
PHYSICAL REVIEW APPLIED
(2022)
Article
Chemistry, Multidisciplinary
Bing Ni, Mikhail Mychinko, Sergio Gomez-Grana, Jordi Morales-Vidal, Manuel Obelleiro-Liz, Wouter Heyvaert, David Vila-Liarte, Xiaolu Zhuo, Wiebke Albrecht, Guangchao Zheng, Guillermo Gonzalez-Rubio, Jose M. Taboada, Fernando Obelleiro, Nuria Lopez, Jorge Perez-Juste, Isabel Pastoriza-Santos, Helmut Coelfen, Sara Bals, Luis M. Liz-Marzan
Summary: A chiral growth method using cysteine as a dissymmetry inducer was developed to prepare gold nanorods with twisted morphology. Electron microscopy analysis suggests that the dissymmetry is caused by the development of chiral facets on the initial nanorods, resulting in a twisted shape. Cysteine plays a crucial role in assisting the enantioselective facet evolution, leading to the formation of highly chiral morphology with significant plasmonic optical activity.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Victor Pacheco-Pena, Diego M. Solis, Nader Engheta
Summary: This opinion article provides a brief summary of the background materials and recent developments in the field of temporal and spatiotemporal media, and offers opinions on potential challenges, opportunities, and open research questions for manipulating fields and waves in four dimensions.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Optics
V. F. Martin, D. M. Solis, D. Jerico, L. Landesa, F. Obelleiro, J. M. Taboada
Summary: This paper presents a discontinuous Galerkin (DG) integral equation (IE) method for the electromagnetic analysis of arbitrarily-shaped plasmonic assemblies. The use of nonconformal meshes provides improved flexibility for CAD prototyping and tessellation of the input geometry. The formulation can readily address nonconformal multi-material junctions and enable the use of h-refinement techniques to improve accuracy without increasing computational cost.
Article
Chemistry, Multidisciplinary
Sonia Maniappan, Camelia Dutta, Diego M. Solis, Jose M. Taboada, Jatish Kumar
Summary: This study reports the synthesis of dog-bone shaped chiral gold nanostructures using a chiral cationic surfactant and excess ascorbic acid. The chiral growth is attributed to the specific binding and structure breaking ability of the chiral surfactant and ascorbic acid. Controlled assembly of the particles allows tuning and enhancement of chiral signals. Experimental observations were validated with theoretical simulations. This work highlights the generation and tuning of plasmonic chirality, providing new insights into intrinsic chirality and paving the way for their application in enantioselective catalysis and biosensing.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Engineering, Electrical & Electronic
Victor F. Martin, Diego M. Solis, Marta G. Araujo, Luis Landesa, Fernando Obelleiro, Jose M. Taboada
Summary: An electric field integral equation (EFIE) discontinuous Galerkin (DG) formulation is proposed in this paper for the electromagnetic (EM) radiation analysis of realistic antennas. The formulation allows for separately building and meshing parts with different characteristics, which is useful for complex multiscale geometries and design optimization processes.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Materials Science, Multidisciplinary
Manuel Obelleiro-Liz, Victor F. Martin, Diego M. Solis, Jose M. Taboada, Fernando Obelleiro, Luis M. Liz-Marzan
Summary: Chiral metal nanoparticles can induce and harness optical activity, but there is limited control over their morphological detail and resulting optical activity due to incomplete knowledge of growth mechanisms. This study uses computer-aided design and simulations to analyze the influence of structural changes on the plasmonic circular dichroism spectra of rod-shaped gold nanoparticles. Interesting patterns in plasmon-mediated resonant behavior are identified, which can guide the understanding and fabrication of these nanoparticles for applications such as spectroscopic detection and surface-enhanced Raman optical activity.
ADVANCED OPTICAL MATERIALS
(2023)
