Article
Chemistry, Multidisciplinary
Petra Pal, Attila Bonyar, Miklos Veres, Laura Juhasz, Melinda Szaloki, Istvan Csarnovics
Summary: Metallic nanoislands were prepared by thermal annealing of gold thin film on a glass substrate to investigate surface-enhanced Raman scattering (SERS) effect. The enhancement factors of SERS substrates were influenced by the analytes' adsorption tendency and electronic structure, with higher enhancement factors observed for specific molecules under different excitation wavelengths.
APPLIED SCIENCES-BASEL
(2021)
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
Chemistry, Physical
Hyun Jeong, Hyeong Chan Suh, Ga Hyun Cho, Rafael Salas-Montiel, Hayoung Ko, Ki Kang Kim, Mun Seok Jeong
Summary: In this study, a potential platform to enhance Raman scattering and increase the number of observable Raman modes in monolayer transition metal dichalcogenides (TMDs) was proposed. The platform consisted of large-scale arrays of gold micropillars (MPs), which were able to enhance the Raman intensity of TMDs and make difficult-to-detect Raman modes observable. The platform showed great industrial advantages and wide applicability due to its low cost, simple process, large controllable area, and short process time.
APPLIED SURFACE SCIENCE
(2024)
Article
Materials Science, Multidisciplinary
Qian Zhang, Rui Yang, Jie Li, Chunxia Pang, Bowen Chen
Summary: The structural, energetic, and Raman vibrational properties of 4-cyanopyridine (4-CNP) adsorbed on Zn12O12 and Zn12O12-graphene oxide (GO) substrates were investigated using DFT-D3. The chemisorption of 4-CNP on Zn12O12 and Zn12O12-GO occurred at the Zn atom through its pyridine N atom. The interaction energies were -1.492 and -1.436 eV respectively. Humidity had little effect on the adsorption properties, while dispersion forces influenced the interaction energy of adsorbed 4-CNP on Zn12O12.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Shi Xuan Leong, Charlynn Sher Lin Koh, Howard Yi Fan Sim, Yih Hong Lee, Xuemei Han, Gia Chuong Phan-Quang, Xing Yi Ling
Summary: The study successfully achieves direct, label-free SERS sensing of biologically important enantiomers by synergizing asymmetric nanoporous gold (NPG) nanoparticles with electrochemical-SERS. This strategy is versatile and can be readily extended to detect various enantiomers, and allows for multiplex quantification of enantiomeric ratios with excellent predictive performance. The research offers a paradigm shift in achieving label-free chiral SERS sensing of various enantiomers.
Article
Chemistry, Physical
Peter M. Spurgeon, Da-Jiang Liu, Theresa L. Windus, James W. Evans, Patricia A. Thiel
Summary: Chemisorbed species, particularly sulfur, can enhance the decay rate of 2D Au islands on metal surfaces, leading to surface pitting and reconstruction. The formation and diffusion of Au-S complexes contribute to the enhanced coarsening of Au islands at lower sulfur coverages.
Article
Nanoscience & Nanotechnology
Lin Zhu, Zhen Meng, Saizhen Hu, Tiancong Zhao, Bing Zhao
Summary: The study focuses on the plasmonic coupling between noble-metal and semiconductor nanostructures, and reveals the enhanced charge transfer and surface-enhanced Raman scattering (SERS) signals in a designed W18O49/Ag heterostructure. A new coupled-plasmon-induced charge transfer mechanism is proposed, providing insight for further studies on plasmonic effects and interfacial charge transfer in metal/semiconductor heterostructures.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Lin Zhu, Zhen Meng, Saizhen Hu, Tiancong Zhao, Bing Zhao
Summary: In this study, we for the first time observed and considered the plasmonic coupling between noble-metal and semiconductor nanostructures in metal/semiconductor heterostructures, using a W18O49/Ag heterostructure composed of Ag nanoparticles and W18O49 nanowires. The heterogeneous structure exhibited a broad and strong surface plasmon resonance (SPR) absorption in the visible wavelength range. Surface-enhanced Raman scattering (SERS) was used to investigate the interactions between metal SPR, semiconductor SPR, and the heterostructure's charge transfer process, revealing that the coupled SPR enhanced the heterostructure's internal charge transfer and SERS signals. A new coupled-plasmon-induced charge transfer mechanism was proposed to explain the improved charge transfer efficiency. This work provides insights for further studies on plasmonic effects and interfacial charge transfer in metal/semiconductor heterostructures.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Shuang Zhou, Zhong Wang, Chenyu Dong, Jie Bian, Weihua Zhang
Summary: This study investigated the wavelength-dependent laser-induced dynamic annealing of single plasmonic nano-antennas using in situ white light spectroscopy. The experiment revealed unexpected back-and-forth motions of rapidly melted single nano-antennas under excitation with a 532 nm laser, while gradual opening of nanogaps was observed with a 405 nm laser. Theoretical analyses suggested that the complex dynamics were caused by multiphysical processes at the nanoscale induced by the laser.
Article
Chemistry, Analytical
Yanyan Zhu, Xia Qiu, Xiaohu Chen, Mimi Huang, Yongxin Li
Summary: The development of new hot spots for surface enhanced Raman scattering (SERS) technique is important. In this study, a single Au nanowire (NW)-based nanosensor for adenosine triphosphate (ATP) sensing was developed using in-situ SERS technique. The nanosensor exhibited strong SERS signals and high sensitivity, selectivity, and stability for ATP sensing. This nanosensor can be used as an ideal platform for real applications, such as trace detection, single cell, and in vivo analysis.
Article
Nanoscience & Nanotechnology
Zunhao Wang, Zhe Liu, Wibke Dempwolf, Julia Molle, Yuya Kanehira, Sergio Kogikoski Jr, Markus Etzkorn, Ilko Bald, Rainer Stosch, Stefan Wundrack
Summary: This paper presents a method for highly adjustable surface adsorption of single plasmonic nanostructures using polar surface arrays. The plasmonic nanostructures, made from DNA origami and functionalized with gold nanoparticles, allow for surface-enhanced spectroscopic techniques. The authors describe the fabrication process of the polar surface array and discuss how the concentration of DNA origami structures and the duration of incubation affect the number of adsorbed nanostructures. Density functional theory simulation explains the selective adsorption of plasmonic nanostructures based on substrate surface properties, preventing false identification resulting from agglomeration.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Arpad Dusa, Fani Madzharova, Janina Kneipp
Summary: SEHRS offers advantages in probing biological samples due to its surface sensitivity and complementary vibrational information. FDTD simulations reveal that the intensity of the laser field and the HRS field are important factors affecting the enhancement of SEHRS.
FRONTIERS IN CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
Chuhong Zhu, Qiangsheng Zhao, Dexian Huo, Xiaoye Hu, Xiujuan Wang
Summary: This study reports a simple electrodeposition strategy for the fabrication of highly surface-roughened gold nanostructure arrays, which exhibit improved SERS intensity with high uniformity. The fabricated thorny gold nanostructure arrays show high SERS sensitivity and detection limits for rhodamine 6G and ferbam, with promising applications in molecular detection. Calibration curves achieved using the fabricated rough gold nanoarrays demonstrate potential for semi-quantitative or quantitative detection. This work offers a facile and effective approach for the rational design of uniform, reproducible, and sensitive SERS substrates.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Review
Chemistry, Multidisciplinary
Nguyen Hoang Ly, Sang Jun Son, Soonmin Jang, Cheolmin Lee, Jung Il Lee, Sang-Woo Joo
Summary: Facile detection of indoor semi-volatile organic compounds (SVOCs) is a critical issue for researchers, with plasmonic nanomaterial platforms offering significant Raman signal enhancements for the ultra-sensitive detection of SVOC molecules. Novel aptasensors-assisted SERS technology is introduced for selective sensing, demonstrating the potential for indoor SVOC detection.
Article
Materials Science, Multidisciplinary
Marius Schumacher, Dorleta Jimenez de Aberasturi, Jan-Philip Merkl, Leonardo Scarabelli, Elisa Lenzi, Malou Henriksen-Lacey, Luis M. Liz-Marzan, Horst Weller
Summary: This study introduces a versatile strategy for the preparation of colloidally stable and biocompatible gold nanoparticle clusters. By tuning the ligand ratio on the surface of each nanoparticle, aggregation can be controlled. The resulting clusters exhibit enhanced surface plasmon resonances and electromagnetic hotspots for surface-enhanced Raman scattering (SERS), making them promising bioimaging agents. These clusters also demonstrate high cellular uptake and low cytotoxicity, allowing for potential applications in cellular imaging.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Physical
Douglas S. Lopes, Lucas L. R. Vono, Ester Miranda, Romulo A. Ando, Paola Corio
Summary: The compositional variations of AgAu/Pd/TiO2 catalysts were investigated using in situ SERS. It was found that as the Ag mole fraction decreased, the hydrogenation rate of PNTP increased exponentially, while the conversion yield of PATP to DMAB decreased rapidly. These variations in catalytic performance can be explained by the formation of surface Ag oxides.
Article
Environmental Sciences
Luis Fernando Amato-Lourenco, Natalie de Souza Xavier Costa, Katia Cristina Dantas, Luciana dos Santos Galva, Fernando Negri Moralles, Suzette Cleuza Ferreira Spina Lombardi, Alfredo Mendroni Junior, Jose Angelo Lauletta Lindoso, Romulo Augusto Ando, Felipe Gallego Lima, Regiani Carvalho-Oliveira, Thais Mauad
Summary: The study found SARS-CoV-2 and microplastics in the outdoor air around the largest medical center in Latin America, with polyester being the most common polymer in the samples. The total amount of microplastics was positively associated with the SARS-CoV-2 viral load and negatively associated with temperature and relative humidity.
ENVIRONMENTAL POLLUTION
(2022)
Article
Chemistry, Physical
Lucas F. Bezerra, Monilson P. Reis, Adolfo I. B. Romo, Dieric S. Abreu, Marcelo H. Gehlen, Elisane Longhinotti, Tercio F. Paulo, Idalina M. M. Carvalho, Izaura C. N. Diogenes
Summary: Photophysical studies on derivatives of 4'-methyl-2,2'-bipyridine with polycyclic aromatic hydrocarbons showed red shifts and broadening of emission spectra with increasing solvent polarity, indicating a dominant charge transfer contribution in high polar solvents. Theoretical calculations found a mixing of local excited-state and charge transfer states in moderately polar solvents, corroborated by the observed single exponential decay lifetimes.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2022)
Article
Biochemistry & Molecular Biology
Kesya Amanda Dantas Rocha, Tercio de Freitas Paulo, Alejandro Pedro Ayala, Valeria da Silva Sampaio, Paulo Iury Gomes Nunes, Flavia Almeida Santos, Kirley Marques Canuto, Edilberto Rocha Silveira, Otilia Deusdenia Loiola Pessoa
Summary: In this study, unknown Withajardin compounds and known tuboanosigenin were isolated from the leaves of Athenaea velutina. Their structures and absolute configurations were determined using various analytical techniques, and their anti-inflammatory activity was evaluated.
Article
Green & Sustainable Science & Technology
Laise Moura Furtado, Dairon Perez Fuentes, Romulo Augusto Ando, Pedro Vitoriano Oliveira, Denise Freitas Siqueira Petri
Summary: Low-cost eco-friendly adsorbents, consisting of CMC, PDA, and BG, were developed for water treatment. These biobased adsorbents showed high efficiency in removing Pb2+ ions and other metal ions from wastewater. Their potential application in the treatment of complex wastewater from undergraduate laboratories was demonstrated.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Biochemistry & Molecular Biology
Lucas Goncalves Queiroz, Barbara Rani-Borges, Caio Cesar Achiles Prado, Beatriz Rocha de Moraes, Romulo Augusto Ando, Teresa Cristina Brazil de Paiva, Marcelo Pompeo
Summary: Freshwater environments, being close to urbanized and industrial areas, are highly vulnerable to microplastic contamination. However, there is limited understanding of the impact of this pollutant on freshwater ecosystems. This study focused on the freshwater amphipod Hyalella azteca and investigated the effects of polyethylene terephthalate (PET) microplastics on its survival and biochemical markers. The results showed no significant mortality, but changes in oxidative stress biomarkers were observed at lower levels of exposure. These findings suggest that although the survival of H. azteca may not be affected, the presence of PET microplastic pollution can pose a threat to the macrobenthic invertebrate community.
CHEMISTRY AND ECOLOGY
(2023)
Article
Chemistry, Physical
Leandro Ramos Marques, Romulo Augusto Ando
Summary: This study provides evidence of weak intermolecular interactions between Lewis acids and Lewis bases by probing fluorine-carbon vibrational modes using infrared spectroscopy, distinguishing the Lewis adduct from FLPs.
Article
Chemistry, Physical
Douglas dos Santos Lopes, Dieric dos Santos Abreu, Romulo Augusto Ando, Paola Corio
Summary: This study demonstrates the regioselective plasmon-driven decarboxylation of mercaptobenzoic acid isomers by reactive oxygen species generated by hot carriers in plasmonic metal nanoparticles. The catalytic C-C bond cleavage over AgNPs and AuNPs is primarily initiated by photogenerated singlet oxygen and hydroxyl radical, respectively. The research sheds light on the tuning of regioselectivity in plasmon-driven transformations and has implications for the design of plasmonic catalysts for specific reactions.
Article
Chemistry, Applied
Lucas F. Bezerra, Tercio F. Paulo, Idalina M. M. de Carvalho, Florencio S. Gouveia Junior, Luiz G. F. Lopes, Izaura C. N. Diogenes
Summary: Molecules with reversible photoreactions, such as dipyridoquinoxalinophenazine (dpqpz), have the potential to be used as photocatalysts in electron transfer reactions for molecular switch design. This study demonstrates the reversible redox-responsive fluorescence emission of dihydro-dpqpz, which can recover its original form upon air contact. The emission efficiency of dihydro-dpqpz is influenced by the solvent polarity, with protic solvents showing strong emission suppression due to hydrogen bonding effects.
Article
Limnology
Barbara Rani-Borges, Lucas Goncalves Queiroz, Karen de Souza Ferreira, Thais Fabiane Gomes Martins, Eduardo Vicente, Romulo Augusto Ando, Marcelo Pompeo
Summary: In recent years, there has been a growing interest in the impacts of microplastics on aquatic environments, particularly on microalgae. However, much of the research has focused on high concentrations of microplastics that are not naturally found in the environment. In this study, Chlorella vulgaris and Raphidocelis subcapitata were exposed to different concentrations of ABS microplastics for 6 days, and physiological changes in cell growth and chlorophyll content were observed.
INTERNATIONAL JOURNAL OF LIMNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Douglas S. Lopes, Ester V. Miranda, Romulo A. Ando, Paola Corio
Summary: Palladium-catalyzed Suzuki-Miyaura cross-coupling was used for the SERS-based detection of organochlorine pesticides (OPs) by modifying silver nanoparticles with 4-mercaptophenylboronic acid (4-MPBA). The catalytic activity increased linearly with the Pd loading, while the SERS activity decreased exponentially with Pd content. Optimized reaction parameters were used for SERS detection of an OP at micromolar levels.
ENVIRONMENTAL SCIENCE-NANO
(2023)
Article
Materials Science, Multidisciplinary
Augusto Goncalves Nobre, Fabio Ramos Dias de Andrade, Andres Fabian Salazar-Naranjo, Josue Neroti Rigue, Ricardo Barreto da Silva, Silvio Roberto Farias Vlach, Romulo Augusto Ando
Summary: This study evaluates the evolution of electrical resistance in mineral graphite and talc under progressive metamorphism simulated in the laboratory. The results show that the morphology and treatment conditions of the samples have a significant influence on their electrical resistance, which is important for the discovery and utilization of potential target rocks with preserved mineral nanometric heterostructures.
C-JOURNAL OF CARBON RESEARCH
(2023)
Article
Chemistry, Physical
Adalberto V. Sanches V. de Araujo, Leandro R. Marques, Antonio C. Borin, Romulo A. Ando
Summary: Time-Dependent Density-Functional Theory (TDDFT) and Extended Multi-State Complete Active Space Second-Order Perturbation Theory (XMS-CASPT2) methods were used to simulate the vibronic and resonance Raman spectra of a push-pull model system. XMS-CASPT2 method showed better accuracy in predicting absorption spectral band intensity and vibronic broadening. In terms of resonance Raman excitation profile, the XMS-CASPT2 method successfully predicted the dominance of different vibrational modes for different energies.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Polymer Science
Rafael S. Dezotti, Laise M. Furtado, Marcio Yee, Ticiane S. Valera, Krishnasamy Balaji, Romulo A. Ando, Denise F. S. Petri
Summary: The microstructure of HPMC cryogels was modified by the addition of ionic (AOT) and non-ionic (Kolliphor(R) EL) surfactants. Cryogels containing AOT had lower compressive modulus, higher specific surface area, lower thermal conductivity, and less hygroscopic walls, while cryogels with Kolliphor(R) EL were the stiffest with the lowest specific surface area and highest thermal conductivity. Density functional theory calculations showed different interaction energies between AOT and HPMC, and HPMC and Kolliphor(R) EL, which influenced the mechanical and thermal properties of the cryogels.
Article
Materials Science, Multidisciplinary
Augusto Goncalves Nobre, Andres Fabian Salazar-Naranjo, Fabio Ramos Dias de Andrade, Silvio Roberto Farias Vlach, Romulo Augusto Ando
Summary: The study simulated the geological formation process of graphene using an apparatus, revealing that graphite deformed near the talc diffusion zone and eventually cleaved, with graphene becoming stable on the talc substrate in the center of the diffusion zone.
MATERIA-RIO DE JANEIRO
(2022)
