Article
Chemistry, Multidisciplinary
Abhishek Das, Ridhima Chadha, Amaresh Mishra, Nandita Maiti
Summary: This study investigated the detailed structural and vibrational analysis of merocyanine using Raman, SERS, and SERRS techniques. The study identified the prevalence of trans- and cis-conformers of protonated merocyanine in solid and acetonitrile solution. The binding characteristics of merocyanine on nanostructured silver-coated films were examined. The study also explored the changes in Raman spectra and enhancement effects under different conditions. The combination of SERRS and DFT analysis revealed the dominance of trans-conformer on the nanostructured silver surface.
FRONTIERS IN CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Miao Yu, Qihang Tian, Guangyuan He, Kaimin Cui, Jihong Zhang
Summary: Surface-enhanced Raman scattering (SERS) is a novel method for low concentration molecular detection, and tapered fiber SERS probes based on silver nanocubes exhibit high sensitivity. These probes can be used for both qualitative and quantitative analysis, with an optimal cone angle of 8.3 degrees.
ADVANCED FIBER MATERIALS
(2021)
Article
Crystallography
Yasmine Fernine, Natercia C. T. Martins, Mustapha Taleb, Tito Trindade
Summary: Green chemical routes for the synthesis of colloidal metal nanocrystals have attracted great interest in the field of nanosciences and biological applications. Among these methods, the synthesis of metal colloids using medicinal plant extracts has shown promise in producing nanocrystals with surfaces modified by biologically derived compounds, which can be further explored for pharmaceutical purposes. Therefore, the development of spectroscopic methods to understand the potential benefits of using formulations containing natural compounds and therapeutic metal nanoparticles is of great relevance.
Article
Chemistry, Multidisciplinary
Tomoko Inose, Shuichi Toyouchi, Shinnosuke Hara, Shoji Sugioka, Peter Walke, Rikuto Oyabu, Beatrice Fortuni, Wannes Peeters, Yuki Usami, Kenji Hirai, Steven De Feyter, Hiroshi Uji-i, Yasuhiko Fujita, Hirofumi Tanaka
Summary: Graphene nanoribbons (GNRs) have attracted tremendous attention for their potential in next-generation nanoelectronic devices. The authors recently discovered that unzipping from double-walled carbon nanotubes (DWNTs) can produce crystalline single-layered GNRs (sGNRs) with high yield. By using silver nanowire-based tip-enhanced Raman spectroscopy (TERS), the authors analyzed the single GNRs and found heterogeneity in defect density and edge structure, which provides deeper insights into the structure and reaction mechanism of unzipped GNRs.
Article
Biochemistry & Molecular Biology
Naznin Shaikh, Narayan N. Som, Prafaulla K. Jha, Padmaja Pamidimukkala
Summary: In this work, nanostructures comprising silver nanoparticles supported on a wrinkled chitosan matrix (Ag@Ch) were successfully synthesized for surface-enhanced Raman scattering (SERS) applications. The effect of wet, dry, and liquid samples on the SERS enhancement was studied, and detection limits for Methylene blue, Crystal Violet, and p-Nitrophenol were determined. The SERS enhancement of the Ag@Ch was attributed to both electromagnetic and chemical effects.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Chemistry, Physical
Ridhima Chadha, Abhishek Das, Sudhir Kapoor, Nandita Maiti
Summary: The adsorption behavior of an anti-thyroid agent, 2-thiazoline-2-thiol (TT) on silver (Ag) and gold (Au) nanoparticles (NPs) was studied with SERS and DFT. Different tautomers were identified, and the surface-induced dimerization of TT was observed. The study provides insights into designing novel metal nanosubstrates and valuable drugs suitable for chelation therapy.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Multidisciplinary
Yanzhao Pang, Mingliang Jin
Summary: A highly aligned AgNW array film was prepared using a self-assembly method, which showed excellent signal reproducibility and detection ability at low concentrations. The uniform distribution of hot spots inside the AgNW substrate amplified the SERS signal.
Article
Chemistry, Analytical
Shinya Ikeno, Takahiro Maekawa, Noriyasu Hara
Summary: This study focuses on the sensitive detection of the molecular marker dipicolinic acid (DPA) in endospores using surface-enhanced Raman scattering (SERS) method. Functional silver nanoparticles with Fe3O4/Ag core-shell structure were constructed to specifically bind to DPA, enabling both qualitative and quantitative detection.
Article
Chemistry, Physical
Alexander S. Krylov, Svetlana N. Krylova, Alexander N. Vtyurin, Eugene M. Roginskii, Li Jin, Ye Tian, Xiaoyong Wei
Summary: The temperature behavior of 0.955 AgNbO3-0.045 LiTaO3 and AgNbO3 ceramics was investigated using Raman spectroscopy in the temperature range from 10 to 415 K. Ab initio calculations were conducted to interpret the Raman spectra of AgNbO3 in the Pmc2(1) phase using three potentials (A-PZ, PBE, and PBEsol). The peculiarities in the Raman spectra of AgNbO3 ceramics were observed and explained. The differences in the spectra between 0.955 AgNbO3-0.045 LiTaO3 and AgNbO3 ceramics were demonstrated, and the temperature of structural changes in both ceramics were discussed.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Jianguo Wang, Songlin Yang, Yurong Cao, Yong-Hong Ye
Summary: A simple approach to fabricate large-scale optoplasmonic hybrid materials (OHMs) for high sensitivity surface-enhanced Raman spectroscopy (SERS) is proposed. The OHM consists of a metal film, a monolayer of nanoparticles (MFON), and a microsphere. The excited wavelength of the localized surface plasmon resonance in the MFON can be controlled by the size of the nanoparticles and an additional dielectric layer. Under specific conditions, Raman signals of low concentration methylene blue can be detected. Numerical simulations show that the OHM provides enhanced sensitivity compared to traditional plasmonic nanostructures.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Analytical
Monica Ricci, Beatrice Fortuni, Raffaele Vitale, Qiang Zhang, Yasuhiko Fujita, Shuichi Toyouchi, Gang Lu, Susana Rocha, Tomoko Inose, Hiroshi Uji-I
Summary: The study introduced the use of silver nanowires as endoscopic probes for detecting intracellular Raman signals and proposed an advanced strategy to significantly enhance their performance. By uniformly forming gold structures on the smooth AgNW surface, high surface-enhanced Raman scattering efficiency was achieved, demonstrating applicability for molecular sensing in cells.
ANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Analytical
Yu Fukunaga, Makoto Harada, Tetsuo Okada
Summary: Freezing is proposed as an efficient way to enhance sensitivity and reproducibility in SERS measurements, maximizing signal intensity and preparing a high-performance SERS platform through simple methods.
Article
Chemistry, Physical
Miles Martinati, Wim Wenseleers, Lei Shi, Saied Md Pratik, Philip Rohringer, Weili Cui, Thomas Pichler, Veaceslav Coropceanu, Jean-Luc Bredas, Sofie Cambre
Summary: In this study, the excited states of ultralong carbon chains encapsulated inside double-walled carbon nanotubes were investigated using wavelength-dependent resonant Raman spectroscopy. The study identified vibronic series of two different electronic states.
Article
Spectroscopy
Mohammad Kamal Hossain, Qasem Ahmed Drmosh
Summary: Plasmonic nanostructures, particularly irregular surfaces of silver nanorings, have shown promise in surface-enhanced Raman scattering (SERS) spectroscopy. Through the fabrication and characterization of clusters-based Ag nanorings, it was found that they could achieve SERS enhancement factors as high as 2.1 x 10^4. By simulating EM near-field distributions and investigating the irregular shapes and arrangements of clusters within the nanorings, a deeper understanding of the underlying EM mechanism in SERS enhancements was gained.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
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)
