Article
Materials Science, Paper & Wood
Dabum Kim, Kangyun Lee, Youngho Jeon, Goomin Kwon, Ung-Jin Kim, Chang-Sik Oh, Jeonghun Kim, Jungmok You
Summary: The immersion of a dried AuNRs/RC hydrogel film in an analyte solution protocol yields excellent SERS activity due to efficient analyte adsorption and an increase in hot spot density.
Article
Chemistry, Multidisciplinary
Puran Pandey, Min-Kyu Seo, Ki Hoon Shin, Young-Woo Lee, Jung Inn Sohn
Summary: In this study, a hierarchically assembled 3D plasmonic metal-dielectric-metal hybrid nano-architecture was designed and prepared for high-performance surface-enhanced Raman scattering (SERS) sensing. The fabricated PMDM hybrid nanostructures exhibited strong SERS signals with highly enhanced electromagnetic hot spots, achieving outstanding SERS performance.
Article
Chemistry, Multidisciplinary
Georgii Pavliuk, Alexey Zhizhchenko, Oleg Vitrik
Summary: Recently, sensors using surface-enhanced Raman scattering (SERS) detectors combined with superhydrophobic/superhydrophilic analyte concentration systems have shown the ability to reach detection limits below the femto-molar level. However, the sensitivity of these sensors is limited by the concentration systems' inability to deposit the analyte on an area smaller than 0.01 mm². This article proposes a new approach to analyte enrichment by utilizing the effect of non-uniform electrostatic field on evaporating droplets, which, when combined with an optimized superhydrophobic/superhydrophilic concentration system, can reduce the deposition area by more than six times. This has the potential to improve the detection limit of plasmonic sensors to the attomolar level.
Article
Chemistry, Physical
Lu Zhang, Guoying Wei, Junfang Li, Meng Yin, Guangcheng Xi
Summary: In this study, molybdenum dioxide ultrathin nanowire bundles were synthesized using a simple chemical method, which exhibited distinct and robust surface plasmon resonance (SPR) effects within the visible light range. As a low-cost SERS substrate, the plasmonic molybdenum dioxide nanowire beams showed a Raman enhancement factor of 2.9 X 10(7) and a minimum detection limit of 1.0 X 10(-11) mol L-1 for Rhodamine 6G. Additionally, these SERS substrates based on molybdenum dioxide ultrathin nanowires demonstrated excellent chemical stability and resistance to corrosion by strong acids and bases, making them highly promising as metal-oxide-based SERS substrates.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Lu Zhang, Guoying Wei, Junfang Li, Meng Yin, Guangcheng Xi
Summary: Molybdenum dioxide ultrathin nanowire bundles were synthesized using a simple chemical method, which demonstrate distinct and robust surface plasmon resonance effects. These plasmonic nanowire beams exhibit a high Raman enhancement factor and minimum detection limit, making them a promising low-cost SERS substrate. Additionally, they exhibit good chemical stability and resistance to corrosion by strong acids and bases.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
Charlynn Sher Lin Koh, Howard Yi Fan Sim, Shi Xuan Leong, Siew Kheng Boong, Carice Chong, Xing Yi Ling
Summary: It has been shown that combining porous metal-organic frameworks (MOFs) with plasmonic nanoparticles (NPs) can create plasmonic NP-MOF nanohybrids with additional functionalities, where the strengths of each material complement each other, leading to wider applications.
ACS MATERIALS LETTERS
(2021)
Article
Chemistry, Physical
V. S. Vendamani, Reshma Beeram, Venugopal Rao Soma
Summary: We have developed hybrid SERS-active substrates for ultra-sensitive detection of various analyte molecules, such as explosives, dyes, and bio-proteins. The substrates consist of vertically aligned Si nanowires decorated with Ag and Au nanoparticles, and encapsulated with MoS2 nano-sheets. The hybrid substrates exhibit superior detection capabilities and excellent signal reproducibility with low limits of detection for different analytes.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Maxim Fatkullin, Raul D. Rodriguez, Ilia Petrov, Nelson E. Villa, Anna Lipovka, Maria Gridina, Gennadiy Murastov, Anna Chernova, Evgenii Plotnikov, Andrey Averkiev, Dmitry Cheshev, Oleg Semyonov, Fedor Gubarev, Konstantin Brazovskiy, Wenbo Sheng, Ihsan Amin, Jianxi Liu, Xin Jia, Evgeniya Sheremet
Summary: Structural electronics and flexible/wearable devices can be achieved by combining polymers with metal nanoparticles. However, it is difficult to fabricate flexible plasmonic structures using conventional technologies. In this study, we developed 3D plasmonic nanostructures/polymer sensors using a single-step laser processing and functionalized them with 4-nitrobenzenethiol (4-NBT) as a molecular probe. These sensors allow ultrasensitive detection with surface-enhanced Raman spectroscopy (SERS).
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
Xiunan Yan, Qing Chen, Qun Song, Ziyu Huo, Ning Zhang, Mingming Ma
Summary: The paper presents a strategy of continuously tuning plasmonic nanoassembly's structure and optical activity using macroscopic deformation, leading to the development of a massive plasmonic nanoassembly-PVP film with adjustable properties. This film shows potential applications in SERS and direct analysis of small molecule analytes in biological samples and food, offering a convenient and time-saving alternative to traditional sample pretreatment processes.
Article
Materials Science, Multidisciplinary
Shan Zhang, Guanglin Zhang, Zhiduo Liu, Zhengyi He, Xiaoqiang Feng, Siwei Yang, Guqiao Ding, Gang Wang, Yongqiang Wang
Summary: In this study, three-dimensional graphene (3D-graphene) was hetero-integrated with a silicon-on-insulator (SOI) substrate through plasma-assisted chemical vapor deposition (PACVD) to create a highly stable, ultra-sensitive, low-cost, and reusable surface-enhanced Raman scattering (SERS) substrate. The nanocavity construction of the 3D-graphene combined with the optical cavity system of the SOI improved the interaction between the incident light and 3D-graphene, resulting in double-enhanced Raman scattering. The 3D-graphene/SOI heterojunction exhibited better detection limits than existing graphene-based SERS substrates and showed potential applications in food safety.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Engineering, Biomedical
J. M. Romo-Herrera, K. Juarez-Moreno, L. Guerrini, Y. Kang, N. Feliu, W. J. Parak, R. A. Alvarez-Puebla
Summary: Paper as a scaffold material meets key requirements for cell culture applications and can mimic cellular micro-environment. Integration of plasmonic nanomaterials allows the generation of multifunctional scaffolds for monitoring different cell cues. Paper-based plasmonic substrates in combination with SERS optical detection represent a powerful future platform for monitoring cell cues during cell culture processes.
MATERIALS TODAY BIO
(2021)
Article
Nanoscience & Nanotechnology
Emilie Darrigues, Zeid A. Nima Al Sudani, Fumiya Watanabe, Alexandru S. Biris
Summary: Plasmonic gap-enhanced Raman tags (GERTs) are emerging nanoprobes that have the potential to play a significant role in complex imaging and detection of biological systems due to their enhanced surface plasmon properties. In this study, the advantages of GERTs were demonstrated using in vitro three-dimensional spheroid cultures, showcasing their potential for complex penetration visualization.
Article
Chemistry, Applied
Malgorzata Skwierczynska, Przemyslaw Wozny, Marcin Runowski, Piotr Kulpinski, Stefan Lis
Summary: Cellulose has the potential to be a promising material for surface-enhanced Raman scattering (SERS) substrates due to its wide availability, low cost, ease of fabrication, high flexibility, and low optical activity. This study demonstrates the development of a cellulose-based substrate that owes its SERS activity to the presence of gold nanorods in its internal structure, ensuring superior stability and reproducibility. The substrate exhibits plasmonic activity and provides easy and reproducible detection of different analytes via the SERS technique.
CARBOHYDRATE POLYMERS
(2022)
Article
Materials Science, Multidisciplinary
Ashwani Kumar Verma, R. K. Soni
Summary: In this study, hybrid Sn-Au SERS substrates composed of AuNPs deposited on textured Sn substrates were fabricated and used for ultra-trace analyte detection. The substrates exhibited hierarchically arranged sharp micro-pyramids with densely decorated micro/nano-surface features, resulting in high SERS performance. The synthesized substrates showed versatility in detecting a wide range of analytes with highly reproducible SERS signals and low limit-of-detection concentrations.
Review
Chemistry, Multidisciplinary
Xiangdong Guo, Wei Lyu, Tinghan Chen, Yang Luo, Chenchen Wu, Bei Yang, Zhipei Sun, F. Javier Garcia de Abajo, Xiaoxia Yang, Qing Dai
Summary: 2D monolayers can be vertically stacked in van der Waals heterostructures to support a wide range of confined polaritons. This offers advantages in terms of controlling the constituent layers, stacking sequence, and twist angles. These heterostructures have extended the performance and functions of polaritons, and potential applications include nanophotonic integrated circuits.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Olha Aftenieva, Julius Brunner, Mohammad Adnan, Swagato Sarkar, Andreas Fery, Yana Vaynzof, Tobias A. F. Koenig
Summary: We use a simple grating configuration to direct and amplify the omnidirectional emission of perovskite nanocrystals. By using a soft lithographic printing process, we can reliably structure perovskite nanocrystals into light-emitting metasurfaces with high contrast on a large area. Our self-assembly process allows for scalable fabrication of gratings with predefined periodicities and tunable optical properties.
Article
Chemistry, Multidisciplinary
Michael Yannai, Raphael Dahan, Alexey Gorlach, Yuval Adiv, Kangpeng Wang, Ivan Madan, Simone Gargiulo, Francesco Barantani, Eduardo J. C. Dias, Giovanni Maria Vanacore, Nicholas Rivera, Fabrizio Carbone, F. Javier Garcia de Abajo, Ido Kaminer
Summary: The ultrafast dynamics of charge carriers in solids is crucial for emerging optoelectronics, photonics, energy harvesting, and quantum technology applications. However, investigating and visualizing such nonequilibrium phenomena at nanometer-femtosecond scales has been a longstanding challenge. In this study, we propose and demonstrate a new interaction mechanism called charge dynamics electron microscopy (CDEM), which enables nanoscale imaging of the femtosecond dynamics of charge carriers in solids. By exploiting the strong interaction of free-electron pulses with terahertz (THz) near fields created by moving charges, we can directly retrieve the THz near-field amplitude and phase, reconstruct movies of the generated charges, and investigate previously inaccessible spatiotemporal regimes of charge dynamics in solids.
Article
Chemistry, Multidisciplinary
Theis P. P. Rasmussen, A. Rodriguez Echarri, F. Javier Garcia de Abajo, Joel D. D. Cox
Summary: The subwavelength plasmonic near-field enhancement is hindered by large ohmic losses in good plasmonic materials, while conventional phase-matching of fields in bulk nonlinear crystals is not suitable for realizing nonlinear optical phenomena on the nanoscale. In contrast, highly-doped graphene supports long-lived, highly-confined, and actively-tunable plasmons, making it an excellent platform for both plasmonics and nonlinear optics. By interfacing multiple graphene nanostructures in close proximity, we can trigger nonlocal effects associated with large gradients in the electromagnetic near field to enhance nonlinear response.
Article
Polymer Science
Ekaterina V. V. Kukhtenko, Filipp V. V. Lavrentev, Vladimir V. V. Shilovskikh, Polina I. I. Zyrianova, Semyon I. I. Koltsov, Artemii S. S. Ivanov, Alexander S. S. Novikov, Anton A. A. Muravev, Konstantin G. G. Nikolaev, Daria V. V. Andreeva, Ekaterina V. V. Skorb
Summary: In this paper, a novel approach to the on-demand periodic formation of polyelectrolyte complexes through a Liesegang-type hierarchical organization was developed. The proposed methodology allows for the self-assembly and self-healing of membranes after exposure to external stimuli, such as potential difference and high pH. The resulting periodically self-assembled polyelectrolyte nanomembranes could find applications in energy storage devices and intelligent biocompatible membranes.
Article
Optics
Xihang Shi, Michael Shentcis, Yaniv Kurman, Liang Jie Wong, F. Javier Garcia de Abajo, Ido Kaminer
Summary: The tunable control of X-ray waves is a critical challenge for applications in X-ray spectroscopy, medical imaging, and radiation therapy. The proposed method of shaping X-ray waves directly at the source using strain on van der Waals materials has the potential to bypass the limits of current X-ray optics technology and enable further developments in high-resolution X-ray science.
Article
Chemistry, Multidisciplinary
Ivan Madan, Eduardo J. C. Dias, Simone Gargiulo, Francesco Barantani, Michael Yannai, Gabriele Berruto, Thomas LaGrange, Luca Piazza, Tom T. A. Lummen, Raphael Dahan, Ido Kaminer, Giovanni Maria Vanacore, F. Javier Garcia de Abajo, Fabrizio Carbone
Summary: Understanding and actively controlling the dynamics of nonequilibrium electron clouds is crucial for various applications. However, these clouds evolve in a complex manner on small scales, making them difficult to study. In this study, we use an ultrafast transmission electron microscope to solve the challenge of characterizing the evolution of electron clouds generated on metallic structures, providing insights into their intricate mechanisms and dynamics. This technique, known as charge dynamics electron microscopy (CDEM), opens up possibilities for studying a wide range of nonequilibrium electrodynamic phenomena on the nanoscale.
Article
Chemistry, Multidisciplinary
Quinn A. Besford, Christian Rossner, Andreas Fery
Summary: Identifying changes in the nanoscopic domain is a key challenge in the physicochemical sciences. Recently, new systems that leverage established concepts with fluorescence- and plasmonic-based sensing have been devised, which has reinvigorated the domain. The role of specific functional polymer architectures for the realization of nano-to-macro sensing of subtle nano-messengers is discussed.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Anik Kumar Ghosh, Swagato Sarkar, Takuya Tsuda, Soosang Chae, Andre Knapp, Mirko Nitschke, Amit Das, Sven Wiessner, Tobias A. F. Koenig, Andreas Fery
Summary: Metal-semiconductor nanostructures are widely used in photodetection, photocatalysis, and photovoltaics. In photodetection, the resistance typically decreases with the generation of charge carriers upon illumination, but an opposite response, an increase in resistance, is observed in interconnected metal-semiconductor gratings. This study presents a fabrication method using wrinkle structuring and oblique angle material deposition to create photoresistors with large-area periodic structures and cracks that serve as connections for two-point contact measurements. It is also found that an additional deposition of an amorphous titania layer further enhances the current reduction on photoexcitation.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Review
Chemistry, Physical
Niclas Weigel, Yue Li, Andreas Fery, Julian Thiele
Summary: Over the past two decades, microfluidics has played a significant role in the design and fabrication of nano-, micro-, and mesoscale materials such as nanoparticles, micelles, vesicles, emulsion droplets, and microgels. Microfluidics offers precise control over material parameters and has contributed to understanding the early stages of material design, nucleation, and growth processes. Recent advancements in microfluidic techniques have expanded hydrogel design to incorporate multiple functions and produce hierarchical structures, enabling applications in sensing, 3D bioprinting, continuous fabrication, and shaping via microchannels.
CURRENT OPINION IN COLLOID & INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
Dmitrii Sychev, Simon Schubotz, Quinn A. Besford, Andreas Fery, Guenter K. Auernhammer
Summary: In this study, the adhesion behavior of PNIPAM polymer brushes in different states was analyzed using SCP AFM combined with RICM. It was found that the adhesion force in the swollen state showed strong time dependence and the pull-off force method exhibited rate dependence, indicating a non-equilibrium process. The contact radius method was found to be more reliable for determining the equilibrium work of adhesion. This work highlights the important benefits of using optical measurements when deriving the works of adhesion between colloidal probes and polymer brush surfaces.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
Annette Jones, Emily K. Searles, Martin Mayer, Marisa Hoffmann, Niklas Gross, Hyuncheol Oh, Andreas Fery, Stephan Link, Christy F. Landes
Summary: By eliminating contributions from heterogeneous line width broadening and refractive index changes, efficient resonance energy transfer (RET) between AuNRs and PANI is revealed in AuNR-PANI hybrid systems, which dominates the optical response during the dynamic tuning of the spectral overlap.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
P. A. D. Goncalves, F. Javier Garcia de Abajo
Summary: This study theoretically demonstrates that core-level photoemission from nanostructures can exhibit spectrally narrow plasmonic features with relatively high probabilities analogous to the direct peak. The morphology and dimensionality of the nanostructures have a dramatic effect on the plasmon-satellite probabilities, and universal scaling laws are found. Additionally, a pump-probe scheme is introduced to explore the ultrafast dynamics of the sampled nanostructure by optically exciting plasmons prior to photoemission.
Article
Physics, Multidisciplinary
Lu Wang, F. Javier Garcia de Abajo, Georgia T. Papadakis
Summary: In this article, the violation of Kirchhoff's law is achieved in pattern-free heterostructures. It is demonstrated that a resonant mode in a dielectric spacer between a nonreciprocal film and a back reflector is sufficient to maximally violate Kirchhoff's law. The minimal dielectric requirements for such functionality are identified and currently available materials satisfy these requirements.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Eduardo J. C. Dias, Ivan Madan, Simone Gargiulo, Francesco Barantani, Michael Yannai, Giovanni Maria Vanacore, Ido Kaminer, Fabrizio Carbone, F. Javier Garcia de Abajo
Summary: We develop a comprehensive microscopic theory to predict the spatiotemporal dynamics of laser-pulse-induced plasmas, and study the characteristics of terahertz fields generated through electron emission, metal screening, and plasma cloud interactions. We also investigate the interaction with femtosecond electron beams and explain recent ultrafast electron microscopy experiments. Our work contributes fundamental insight into the generation and dynamics of micron-scale electron plasmas and their interaction with ultrafast electron pulses.
NANOSCALE ADVANCES
(2023)