Article
Electrochemistry
Sheila Hernandez, Juan Perales-Rondon, Aranzazu Heras, Alvaro Colina
Summary: EC-SOERS is a new phenomenon that enhances the Raman signal during the oxidation of a metal surface. Studies show that carbonyl and carboxyl groups are necessary to observe this phenomenon, with a delocated charge being important factor. Evaluating the enhancement factors for different molecules with highly delocated charge and a carboxyl group sheds more light on the interaction of molecules with the electrochemically generated SOERS substrates.
ELECTROCHIMICA ACTA
(2021)
Article
Chemistry, Physical
Faezeh Mohaghegh, Alireza Mazaheri Tehrani, Arnulf Materny
Summary: The increase in inelastically scattered signal observed in Surface-enhanced Raman spectroscopy (SERS) is attributed to different mechanisms. The study revealed a transition to pure electromagnetic enhancement when molecules are separated from the metal surface. By preventing direct contact between molecules and the metal surface, the electronic (chemical) enhancement mechanism can be switched.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Analytical
W. Cheuquepan, S. Hernandez, M. Perez-Estebanez, L. Romay, A. Heras, A. Colina
Summary: Electrochemistry can be used to generate SERS substrates, utilizing the plasmonic properties of nanos-tructures and the chemical mechanism, with time-resolved Raman spectroelectrochemistry providing valuable information. Comparing Au and Ag metals for folic acid detection in drugs, it was found that Ag SERS substrates outperformed Au SERS substrates in complex samples.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Physics, Multidisciplinary
Usman Khan Khalil, Waqas Farooq, Javed Iqbal, Syed Zain Ul Abideen Kazmi, Adnan Daud Khan, Anees Ur Rehman, Saba Ayub
Summary: This paper proposed three different configurations of bowtie nanoantennas, optimized the size parameters to achieve maximum near field enhancement, and found that the Triple Bowtie Structure (TBS) delivers the highest enhancement factor with a triple resonance peak. Moreover, the study showed that the enhancement decreases as the antenna size reduces.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Spectroscopy
Tong Zhang, Shunhua Zhu, Jingjing Wang, Zhiying Liu, Mingxin Wang, Shibao Li, Qingli Huang
Summary: Fabricating sensitive, stable and low-cost nanomaterials for glucose detection is crucial for disease diagnosis and monitoring. In this study, a nanocomposite (polypyrrole bridging GO@Au@MnO2) was developed as a novel surface-enhanced Raman scattering (SERS) nanoprobe for quantitative glucose detection in trace serum.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Review
Chemistry, Multidisciplinary
Ilya A. Milekhin, Alexander G. Milekhin, Dietrich R. T. Zahn
Summary: This study presents the optical response of spherical CdSe nanocrystals using SERS and TERS techniques, achieving significant enhancement of optical phonons by selecting appropriate plasmonic substrates. Combining Raman scattering with atomic force microscopy offers nanoscale spatial resolution for investigating phonon properties. Gap-mode TERS further enhances Raman scattering of CdSe NCs' optical phonon modes with nanometer spatial resolution, providing new pathways for optical characterization and phonon spectrum details at the nanometer scale of single semiconductor nanostructures.
Article
Physics, Multidisciplinary
Guanzhou Lin, Bingquan Yang, Chenglong Zhang, Jia Zhu, Yang Wang, Liye Li, Shisong Xiong, Jinwen Zhang, Zhimei Qi, Wengang Wu
Summary: In this study, a simple composite substrate combining a metal metasurface and silver nanoparticles was developed to enhance the performance of surface-enhanced Raman scattering (SERS) sensing. The composite substrate showed high enhancement factor, good stability, and reproducibility, enabling the detection of trace substances.
Article
Spectroscopy
Nikolai G. Khlebtsov, Eric C. Le Ru
Summary: Analytical expressions for the surface- and orientation-averaged surface enhanced Raman scattering factor for small plasmonic spheroids are derived in this study, showing significant differences from previous approximations. The introduction of an improved electrostatic approximation provides more accurate results and better agreement with T-matrix calculations. The overestimation of SERS EF for spheroids due to higher curvature at the tips is discussed, along with possible generalizations to other axially symmetrical particles.
JOURNAL OF RAMAN SPECTROSCOPY
(2021)
Article
Chemistry, Multidisciplinary
Myoung Gyu Kim, Miyeon Jue, Kwan Hee Lee, Eun Yeong Lee, Yeonjeong Roh, Minju Lee, Hyo Joo Lee, Sanghwa Lee, Huifang Liu, Bonhan Koo, Yoon Ok Jang, Eui Yeon Kim, Qiao Zhen, Sung-Han Kim, Jun Ki Kim, Yong Shin
Summary: The study introduces a deep learning assisted ZnO-Au-SERS-based direct amplification (ZADA) system for rapid, sensitive molecular diagnostics. The system can amplify target nucleic acids directly on the SERS surface, eliminating the need for post-amplification hybridization and Raman reporters. Clinical validation with COVID-19 samples yielded high sensitivity and specificity. The integration of a deep learning program further enhanced sensitivity and specificity to 100%.
Article
Chemistry, Analytical
Weixing Gao, Weiman Duan, Dandan Peng, Juan Li, Zhangmei Hu, Dongmei Wang, Zhengjun Gong, Meikun Fan
Summary: The complexity of substances in environmental water bodies is leading to severe ecotoxicological problems. Evaluating water quality accurately based on the species and concentration of chemicals alone is difficult due to the intricate interaction among various chemicals. Therefore, the acute toxicity evaluation of water is of significant importance in environmental monitoring, especially in emergency situations. This study proposes a SERS approach to evaluate the acute toxicity of fresh water for the first time, using indole as an indicator. It demonstrates the feasibility of using SERS-based microbial sensors to assess acute toxicity in water.
MICROCHEMICAL JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Junxiang Xiang, Yunxia Wang, Yupeng Wu, Qi Peng, Langquan Shui, Wengen Ouyang, Tao Ding, Ze Liu
Summary: A cost-effective approach for fabricating highly ordered metallic pillar arrays in centimeter scale has been developed using superplastic nanomolding and anodic aluminum oxide templates. This method enables surface-enhanced Raman scattering with an enhancement factor of approximately 10^6 and provides guidance for quantitative analysis on the sub-micrometer scale.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Chemistry, Multidisciplinary
Lei Ouyang, Tobias Meyer-Zedler, Kel-Meng See, Wei-Liang Chen, Fan-Cheng Lin, Denis Akimov, Sadaf Ehtesabi, Martin Richter, Michael Schmitt, Yu-Ming Chang, Stefanie Grafe, Jurgen Popp, Jer-Shing Huang
Summary: This study investigates the enhancement effect of plasmonic gratings in nonlinear surface-enhanced coherent anti-Stokes Raman scattering (SECARS) using the platform of plasmonic Doppler grating (PDG). The PDGs spatially separate the input and output enhancement, allowing for observation and comparison of overall enhancement from different combinations of individual input and output beams. The results indicate that enhancement in the pump and anti-Stokes beams plays a more critical role in the overall enhancement than that in the Stokes beam.
Review
Chemistry, Analytical
Dan Li, Ling Xia, Gongke Li
Summary: This paper reviews the classification and applications of nanozymes in surface-enhanced Raman scattering (SERS), highlighting their importance in disease diagnosis, food safety, and environmental safety. The practical shortcomings of nanozymes in SERS applications are also discussed, and suggestions for further research are provided.
Article
Spectroscopy
Mengmeng Zheng, Yamin Lin, Jianshu Xu, Jiamin Gao, Wei Gong, Shusen Xie, Yun Yu, Juqiang Lin
Summary: This study compared electroporation-assisted and ultrasound-assisted delivery methods for surface-enhanced Raman scattering (SERS) detection, finding that the two methods have different capabilities in delivering nanoparticles into living cells. Ultrasound-assisted SERS showed better sensitivity, specificity, and accuracy in discriminating and identifying drug-treated degranulated mast cells compared to electroporation-assisted SERS.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Review
Chemistry, Physical
Ryan D. Norton, Hoa T. Phan, Stephanie N. Gibbons, Amanda J. Haes
Summary: This review discusses the recent advances in quantitative SERS detection, focusing on intermolecular interactions, surface selection rules, and target molecule solubility and accessibility. The impacts of surface selection rules and enhancement mechanisms on the activation and deactivation of normal Raman modes in SERS are explored. The review also summarizes the experimental conditions that can be used to tune the molecular affinity to and density near SERS substrates.
ANNUAL REVIEW OF PHYSICAL CHEMISTRY
(2022)
Correction
Chemistry, Analytical
Johan Grand, Baptiste Auguie, Eric C. Le Ru
ANALYTICAL CHEMISTRY
(2020)
Article
Chemistry, Physical
Boris N. Khlebtsov, Vitaly A. Khanadeev, Andrey M. Burov, Eric C. Le Ru, Nikolai G. Khlebtsov
JOURNAL OF PHYSICAL CHEMISTRY C
(2020)
Article
Chemistry, Multidisciplinary
Aleksa Djorovic, Steven J. Oldenburg, Johan Grand, Eric C. Le Ru
Article
Optics
Adam Francis, Chhayly Tang, Eric C. Le Ru
Summary: This paper presents a rigorous approach for measuring the throughput of an integrating sphere and discusses the impact of optical fibers on the measured sphere throughput. The importance of realistic ports in experiments is emphasized, showing that failure to consider this aspect can lead to erroneous results. Experimental evidence is provided for recent theoretical predictions regarding the effects of optical fibers and angular distribution of light exiting the port.
Article
Multidisciplinary Sciences
Laura E. Revell, Peter Kuma, Eric C. Le Ru, Walter R. C. Somerville, Sally Gaw
Summary: Preliminary modelling shows that airborne microplastics may have a minor cooling influence on the atmosphere, with potential increasing effects on the climate system in the future. However, there are uncertainties regarding the geographical and vertical distribution of microplastics, and without efforts to overhaul plastic production and waste management practices, the abundance and radiative forcing of airborne microplastics will continue to rise.
Article
Chemistry, Physical
Matt R. A. Majic, Baptiste Auguie, Eric C. Le Ru
Summary: This study compares different approximation methods to predict the spectra of metallic spheroidal nanoparticles. The results show that the Taylor expansion provides more accurate predictions and is applicable to a wider range of parameters.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Yi Zhang, Sujay Prabakar, Eric C. Le Ru
Summary: This study demonstrates the variations in adsorbed species on silver nanoparticles (AgNPs) when different halide ligands are introduced. It also reveals the interference between anionic surfactants (AS) and cationic protein (collagen) on AgNPs.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Chhayly Tang, Baptiste Auguie, Eric C. Le Ru
Summary: The research investigates the impact of adsorbed molecule orientation and position on the surface of metallic nanoparticles on the sensitivity of localized surface plasmon resonance (LSPR) sensing. Results show that molecules with their main optical axis perpendicular to the surface and located near hot spots can induce a significantly larger resonance shift, suggesting potential improvements in LSPR sensing sensitivity through targeted adsorption at hot spots with carefully engineered molecular orientation.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Andrei Stefancu, Julian Gargiulo, Geoffry Laufersky, Baptiste Auguie, Vasile Chis, Eric C. Le Ru, Min Liu, Nicolae Leopold, Emiliano Cortes
Summary: Plasmonic nanoparticles can drive chemical reactions by utilizing sunlight and controlling the interface between nanoparticles and molecules. By modifying the energy landscape and controlling the selectivity of charge and energy transfer, as well as vibrational pumping rate, the selectivity of plasmon-driven chemical reactions can be controlled. This provides a method for selectively targeting chemical bonds by changing the metal-molecule interface.
Article
Limnology
Erik C. Krieger, Wendy A. Nelson, Johan Grand, Eric C. Le Ru, Sarah J. Bury, Amelie Cossais, Simon K. Davy, Christopher E. Cornwall
Summary: This study assesses the calcification physiology of five cool temperate coralline algae in response to different irradiance levels and finds that the enhancement of calcification rates is limited to lower irradiances. The study also suggests the existence of two calcification strategies and indicates that magnesium incorporation is determined by the magnesium to calcium ratio in the calcifying fluid.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Article
Optics
Chhayly Tang, Baptiste Auguie, Eric C. Le Ru
Summary: In this study, a thin-shell approximation is developed for the Mie scattering problem in a spherical multilayer structure with radially anisotropic dielectric functions. This approximation simplifies the numerical calculations and is applicable to the calculation of optical absorption in each individual layer. Experimental results demonstrate that the thin-shell predictions show excellent agreement with the full solution for experimentally relevant parameters, suggesting that this approximation can be utilized as a substitute to speed up numerical implementation and simplify analytical developments.
Article
Optics
Matt Majic, Walter R. C. Somerville, Eric C. Le Ru
Summary: Recent research has shown that the mean path length of rays inside refractive objects under Lambertian illumination is not independent of the medium's scattering strength, particularly in the case of zero scattering. Trapped ray trajectories play a crucial role in creating an unexpected discontinuity from zero to low scattering. This study provides alternative analytic results for the mean path length of simple refractive shapes under zero scattering conditions.
Article
Materials Science, Multidisciplinary
Chhayly Tang, Baptiste Auguie, Eric C. Le Ru
Summary: This work introduces an effective dielectric function model for anisotropic layers of polarizable molecules adsorbed on metallic surfaces, taking into account orientation effects and coverage dependence. The model is validated by focusing on dyes adsorbed on metallic nanospheres and shows good agreement with more complex microscopic calculations. The effective medium model provides a simple means to study orientation effects and coverage dependence in systems such as dyes adsorbed on nonspherical nanoparticles.
Article
Physics, Fluids & Plasmas
Matt Majic, Eric C. Le Ru
Summary: Logopoles are a class of solutions to Laplace's equation that exhibit interesting mathematical properties, particularly in axisymmetric problems. They generalize solid spheroidal and solid spherical harmonics, and have special significance for multipoles with negative order. Their definitions conserve key properties of the m = 0 case, involving Legendre functions of the second kind and connections to exterior spheroidal harmonics.
Article
Biochemistry & Molecular Biology
Yi Zhang, Megha Mehta, Bradley W. Mansel, Hon Wei Ng, Yang Liu, Geoff Holmes, Eric C. Le Ru, Sujay Prabakar