Article
Chemistry, Multidisciplinary
Xueqing Yang, Yi Liu, Shiu Hei Lam, Jing Wang, Shizheng Wen, ChiYung Yam, Lei Shao, Jianfang Wang
Summary: In this study, a facile wet-chemistry approach was used for the selective deposition of zeolitic imidazolate framework-8 (ZIF-8) on anisotropic Au nanobipyramids (NBPs) and nanorods. ZIF-8 was selectively deposited at the ends and waist and around the entire surface of the elongated Au nanocrystals. The NBP-based nanostructures with end-deposited ZIF-8 exhibited the best surface-enhanced Raman scattering (SERS) performance, showing potential for molecular sensing, optical switching, and plasmonic catalysis.
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, Multidisciplinary
Jan Krajczewski, Robert Ambroziak, Andrzej Kudelski
Summary: Surface-Enhanced Raman Scattering (SERS) refers to the phenomenon where the efficiency of generating Raman spectra by molecules adsorbed on some substrates is many orders of magnitude larger than those that are not adsorbed. Significant advances have been made in utilizing nanostructured non-metallic materials as SERS substrates, showing great potential for future applications.
Article
Optics
Gan-Yu Chen, Yi-Bin Sun, Pei-Chen Shi, Tao Liu, Zhi-Hao Li, Si-Heng Luo, Xin-Chang Wang, Xiao-Yu Cao, Bin Ren, Guo-Kun Liu, Liu-Lin Yang, Zhong-Qun Tian
Summary: Interfacial host-guest complexation is a versatile way to functionalize nanomaterials, but the study of it is difficult due to the complicated interfacial environment. Using surface-enhanced Raman spectroscopy (SERS), a cooperative effect between CB[7] and MV2+ on aggregating Au NPs was revealed, along with similar guest complexations among CB[n]s and MV2+. This unconventional exclusive complexation model provides new insights into host-guest interactions at nanostructured interfaces, which could be beneficial for applications in engineered nanomaterials.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Feifan Li, Xinyang Mu, Xueqing Tang, Ge Song, Hongzhao Sun, Xiuling Zha, Peiyan Sun, Jianhui Fang, Dongmei Hu, Shan Cong, Zhigang Zhao
Summary: Non-metallic materials have unique advantages over metal materials as active substrates for surface-enhanced Raman scattering (SERS). However, the Raman enhancement achieved with non-metallic materials is considerably lower due to their inefficient interaction with the incident wavelength. In this study, colourful semiconductor-based SERS substrates are proposed for the first time by utilizing a Fabry-Perot cavity, which allows for manipulating light. By finely adjusting the absorption frequency and intensity, resonant absorption can be achieved with various non-metal SERS substrates, leading to a sensitivity enhancement of approximately 100 times.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Adela Hankova, Anna Kuzminova, Jan Hanus, Petr Sezemsky, Radka Simerova, Vitezslav Stranak, Katarzyna Grochowska, Dujearic-Stephane Kouao, Katarzyna Siuzdak, Marek Prochazka, Tereza Kosutova, Ondrej Kylian
Summary: In this study, Ag/TiO2 coatings with different architectures were prepared using plasma-assisted techniques, and their SERS performance was investigated and compared. Nanoislands enhance the SERS signal, TiO2 degrades surface contaminants, and the photoactivity of titania enables the recycling of substrates. Nanostructured Ag/TiO2 coatings with larger active surface area show a good compromise between high detection limit and recyclability, allowing for the detection of methylene blue at low concentrations and easy cleaning by UV radiation.
SURFACES AND INTERFACES
(2022)
Review
Chemistry, Physical
Xueqing Q. Yang, Yao Lu, Yi Liu, Jing Wang, Lei Shao, Jianfang F. Wang
Summary: Plasmonic heterostructures composed of plasmonic metal nanocrystals and semiconductors or metals have attracted extensive attention and have been applied in optoelectronics, biotechnologies, catalysis, and light harvesting fields. They possess unique plasmonic properties and various deposited materials, allowing partial deposition of functional materials through site-selective overgrowth.
Article
Chemistry, Physical
Aleksandra Michalowska, Kacper Jedrzejewski, Andrzej Kudelski
Summary: Abnormal metabolism or imbalance of dopamine can lead to neurological disorders. A study found that certain salts strongly influence the spectral patterns and intensity of the SERS spectra of dopamine adsorbed on a silver substrate. Additionally, the addition of electrolytes significantly increases the intensity of the SERS spectrum, allowing for a lower limit of detection of dopamine. These findings may aid in the development of dopamine SERS sensors.
Article
Thermodynamics
Wenbin Zhou, Dongmei Han, Hualin Ma, Yanke Hu, Guodong Xia
Summary: Nanostructured surfaces with rectangular nano-cavities have been found to greatly enhance nucleate boiling heat transfer. The nano-cavities can significantly reduce the time and wall superheat required for the onset of nucleate boiling, as well as delay the transition to film boiling. The width of the rectangular cavity plays a crucial role in the heat accumulation effect and heat transfer efficiency.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Analytical
Cuijuan Wang, Ming Shang, Haiyan Wei, Mengping Zhang, Wei Zou, Xiao Meng, Wenwen Chen, Hua Shao, Yongchao Lai
Summary: The study introduces a SERS-based method with high sensitivity, reproducibility, and excellent selectivity, showing consistent results with the USEPA's UV colorimetric method. This method can be applied practically in determining Cr(VI) concentrations in drinking and environmental water samples, offering the advantages of being faster, portable, and requiring no pretreatment.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Materials Science, Multidisciplinary
M. Edith Navarro-Segura, Ruben Dario Rivera-Rangel, Ana Arizmendi-Morquecho, Israel Lopez, J. Alvarez-Quintana, Margarita Sanchez-Dominguez
Summary: In this study, a highly sensitive and reusable plasmonic nanostructure substrate was developed using a facile and low-cost method. The substrate exhibits high spatial resolution and is capable of detecting high-resolution SERS spectra at very low solution concentrations. The results were confirmed using the discrete dipole approximation and Mie's theory, and finite element modeling demonstrated the superior surface electric field detection performance of hollow structures compared to solid structures.
APPLIED MATERIALS TODAY
(2022)
Review
Chemistry, Analytical
Jingxing Guo, Ying Liu, Huangxian Ju, Guangming Lu
Summary: This review summarizes and evaluates recent works on surface-enhanced Raman scattering (SERS)-based on-site analysis in the past five years. It provides an overview of the analytical workflow and various application scenes, and discusses future challenges and development trends. The review serves as a guide for researchers and engineers in exploring novel testing strategies for field analysis.
TRAC-TRENDS IN ANALYTICAL CHEMISTRY
(2022)
Article
Spectroscopy
Hui-fang Du, Jian Zhu, Guo-jun Weng, Jian-jun Li, Xin Li, Jun-wu Zhao
Summary: In this study, Janus Au-Ag nanoparticles with tunable negative surface curvature were successfully synthesized by ligand-mediated interface control. By adjusting the interfacial energy, the nanoparticles could be continuously tuned from dumbbell-like core-shell structures to L-shaped Janus structures, and then rod-like core-shell structures with resizable Ag domains. These nanoparticles exhibited significantly enhanced plasmonic spectrum properties and surface-enhanced Raman scattering activity, providing potential applications in nanometer optical devices.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Spectroscopy
Zhishun Jie, Jia Liu, Ye Ying, Haifeng Yang
Summary: We propose a sensing strategy for Hcy using surface enhanced Raman scattering (SERS) method and the specific reaction of o-phthalaldehyde (OPA) and Hcy. The obtained adduct, 2-(1-carboxyl-3-thiopropyl)-1-isoindolinone (Hcy-OPA), can be directly detected by SERS using gold nanoparticles (Au NPs) as the substrate. This developed SERS method shows superior sensitivity with a low detection limit and a broad linear range, and it can detect Hcy in bovine serum samples without interference from other amino acids and glutathione.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Chemistry, Analytical
Ibrahim Halil Oener, Christin David, Christine Joy Querebillo, Inez M. Weidinger, Khoa Hoang Ly
Summary: This study presents a facile approach to determine the electromagnetic field enhancement and optical activity of nanostructured TiN electrodes, using the combination of TiN electrodes and surface-enhanced Raman scattering (SERS) spectroscopy. The results provide valuable insights into the properties and applications of TiN electrodes.
Article
Chemistry, Physical
Keshav Kumar Jha, Amrutha Prabhakaran, Christopher S. Burke, Marcus Schulze, Ulrich S. Schubert, Tia E. Keyes, Michael Jaeger, Benjamin Dietzek Ivansic
Summary: Triplet-triplet annihilation upconversion is an emerging technology that has the potential to convert long-wavelength photons to higher photon energies. Transferring the upconversion system from solution to solid matrices is a challenge, but various approaches have been established. This study investigates the effect of integrating molecular sensitizers into a PMMA polymer on the upconversion process, and compares the results to those using a monomeric annihilator.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Sean Hennessey, Christopher S. Burke, Roberto Gonzalez-Gomez, Debobroto Sensharma, Wenming Tong, Amal, Cherian Kathalikkattil, Fabio Cucinotta, Wolfgang Schmitt, Tia E. Keyes, Pau Farras
Summary: A new multimetallic photoactive coordination polymer with high photostability and unique optical properties has been successfully synthesized.
Article
Chemistry, Inorganic & Nuclear
Komala Pandurangan, Anthony B. Carter, Paulo N. Martinho, Brendan Gildea, Tibebe Lemma, Shang Shi, Aizuddin Sultan, Tia E. Keyes, Helge Mueller-Bunz, Grace G. Morgan
Summary: This study reports the structural and magnetic properties of a new spin crossover complex in lattices with different counterions. Comparison experiments show that alkylation effectively inhibits the thermal spin crossover pathway. Further investigations confirm the stability of the high spin state in dilute environments.
Article
Nanoscience & Nanotechnology
Sawsan Almohammed, Agata Fularz, Mohammed Benali Kanoun, Souraya Goumri-Said, Abdullah Aljaafari, Brian J. Rodriguez, James H. Rice
Summary: Semiconducting materials are proposed as alternatives to noble metal nanomaterials to enhance Raman scattering. Bioinspired semiconducting diphenylalanine peptide nanotubes annealed through a structural transition were demonstrated to support Raman detection of molecules, including mononucleotides, at concentrations as low as 10(-7) M. The enhancement is achieved by introducing electronic states below the conduction band to facilitate charge transfer to the analyte molecule. This study shows that organic semiconductor-based materials can serve as platforms for enhanced Raman scattering for chemical sensing, without the need for electromagnetic surface-enhanced Raman spectroscopy.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Nirod Kumar Sarangi, Amrutha Prabhakaran, Tia E. Keyes
Summary: Quinacrine is a versatile drug with antimalarial, antianthelmintic, antiprotozoan, and multidrug resistance combating properties. By using microcavity-suspended lipid bilayers as in vitro models, the influence of cholesterol and mixed-lipid composition on the membrane interactions of quinacrine was investigated. Label-free surface-sensitive techniques, such as electrochemical impedance spectroscopy and surface-enhanced Raman spectroscopy, were utilized to study drug permeability and binding behavior.
Article
Materials Science, Multidisciplinary
Ahmed T. Alanazi, James H. Rice
Summary: Combining plasmonic and semiconductors offers significant potential in creating sensing and photocatalytic devices. This work demonstrates the use of conducting polymer materials with plasmonic nanomaterials to boost plasmon-enhanced Raman scattering spectroscopy signal strength and support oxidation of target molecules.
MATERIALS RESEARCH EXPRESS
(2022)
Article
Chemistry, Multidisciplinary
Daniel Obitz, Karmel S. Gkika, Marvin Heller, Tia E. Keyes, Nils Metzler-Nolte
Summary: A lanthanide(iii) complex connected to a light harvesting antenna was synthesized and tested as a potential photosensitizer in photodynamic therapy. The complex showed significant phototoxic activity on cancer cells upon irradiation, with ROS production identified as the compound's phototoxic mode of action. In cell viability assays, a 10-fold decrease in IC50 value was observed compared to the dark control.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Lorcan Holden, Karmel S. Gkika, Christopher S. Burke, Conor Long, Tia E. Keyes
Summary: This study reports a Ru(II) complex (Ru-PDC3) that combines the light switch capability of a Ru(II) dipyridylphenazine complex with the well-known G4-selective ligand Phen-DC3 into a single structure. The complex exhibits the expected light switch effect and strong affinity for G4 structures, while also possessing a powerful G4 disrupting capability. Additionally, the complex is fully water-soluble and readily permeable to live cells.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Jack Robinson, Nirod Kumar Sarangi, Tia E. Keyes
Summary: The study shows that Aβ(1-42) induces oligomerization on the outer leaflet of membranes containing DOPS, leading to membrane damage and solute leakage, with the effects dependent on the concentrations of DOPS and Aβ(1-42) as well as time.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Ruben Arturo Arellano-Reyes, Amrutha Prabhakaran, Rengel Cane E. Sia, Julien Guthmuller, Keshav Kumar Jha, Tingxiang Yang, Benjamin Dietzek-Ivansic, Vickie McKee, Tia E. Keyes
Summary: BODIPY heterochromophores with perylene and/or iodine substituents at the 2 and 6 positions were investigated for their potential as sensitizers in triplet-triplet annihilation up conversion (TTA-UC). The compounds exhibited strong charge transfer absorption and emission properties, and were effective sensitizers for TTA-UC with perylene annihilator in dioxane and DMSO solvents. The emission profiles remained characteristic of charge transfer transition across all solvents tested.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Rafaela T. Marques, Liliana P. Ferreira, Clara S. B. Gomes, Catia S. D. Lopes, Carlos E. S. Bernardes, Nirod Kumar Sarangi, Tia E. Keyes, Paulo N. Martinho
Summary: The storage of guest molecules in nonporous single crystals is an important development in the field of smart materials. We describe the synthesis and characterization of the new spin crossover Fe(III) compound [Fe(3-Br,5-ClsalEen)2]BPh4 center dot CH3CN center dot H2O (salEen = N-ethyl-N-(2-aminoethyl)salicylaldiminate) and its reversible single-crystal-to-single-crystal transformation upon desolvation and resolvation of the crystals. This compound behaves as a spin crossover sponge, and the desolvation/resolvation dynamics were studied through kinetic analysis.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Chemistry, Physical
Arpita Roy, Nirod Kumar Sarangi, Surajit Ghosh, Amrutha Prabhakaran, Tia E. Keyes
Summary: Antimicrobial peptides (AMPs) have significant potential in combating antibiotic resistance by targeting microbial membrane without harming mammalian cells. This study investigated the interactions and synergistic effects of two AMPs, magainin 2 and PGLa, on bacterial and mammalian membrane models. The combined AMPs formed toroidal pores, while individual AMPs only affected the exterior leaflet of the bacterial model. The impact on a ternary, mammalian mimetic membrane was much weaker.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Inorganic & Nuclear
Rhianne C. C. Curley, Christopher S. S. Burke, Karmel S. S. Gkika, Sara Noorani, Naomi Walsh, Tia E. E. Keyes
Summary: Parent and peptide conjugates of bistridentate Ru(II) complexes with expanded bite angles demonstrate high phototoxicity and exceptional permeability in both 2D and 3D cell models for potential use in photodynamic therapy. The Ru(II) complexes show enhanced emission quantum yields and lifetimes, promoting their photoinduced singlet oxygen production. The complexes exhibit significant phototoxicity toward pancreatic cancer cell monolayers, with phototoxic indices ranging from 580 to 760.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Meenaxi Saini, Tia E. Keyes
Summary: Pt1 selectively emits luminescence when binding to G-quadruplex rather than duplex DNA, with enhanced effect on parallel and hybrid G-quadruplex structures. The kinetics of binding are studied for c-myc and the response is partially reversible in a displacement assay.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Multidisciplinary
Chao-Yi Yao, Hong-Yu Lin, Philip Morgenfurt, Tia E. Keyes, A. Prasanna de Silva
Summary: This article introduces shape-switchable cyclophane hosts that can capture and release reactive polypyridineRu(ii) complexes in water. This leads to a network of host-guest binding, acid-base reactions, and chemical redox interconversions. The study of (2-(2'-pyridyl)imidazole)Ru(ii) complexes reveals the emergence of molecular logic gate arrays of varying complexity. The luminescence switching in neutral solution is attributed to the features of the aromatic hosts, including enhanced radiative decay and suppressed nonradiative decay involving deprotonation by reducing the water content within the deep host cavity. These findings demonstrate the control of nanometric coordination chemistry/physics through inclusion in an open box. The shape-switching mechanism of wall collapse/erection is also influenced by the aromatic units of the macrocycle.
