Article
Chemistry, Medicinal
Adrian Leon-Valencia, Sarah Briceno, Carlos Reinoso, Karla Vizuete, Alexis Debut, Manuel Caetano, Gema Gonzalez
Summary: The photochemical reduction method was used to optimize the deposition of silver nanoparticles on the diatom surface for DNA biosensing. The nanocomposites were characterized using various techniques and a significant enhancement in fluorescence response was observed at 440 nm excitation wavelength. This work demonstrates a low-cost and green alternative fabrication method for fluorescent biosensors by depositing plasmonic nanoparticles on diatoms.
Article
Chemistry, Multidisciplinary
Mehdi Rahmani, Sonia Amdouni
Summary: This paper investigates the effect of silver nanoparticle (Ag-NP) deposition on the optical properties of silicon nanowire (SiNW) layer. SiNW arrays were prepared by metal-assisted chemical etching, and Ag particles were inserted into the SiNWs by electroless deposition. Scanning electron microscopy and spectroscopy techniques were used to analyze the morphology and vibrational bands of the SiNWs/Ag composites, respectively. The results show that the PL intensity of SiNWs is significantly increased by the deposition of Ag nanoparticles, mainly due to localized surface plasmon resonance.
JOURNAL OF NANOPARTICLE RESEARCH
(2023)
Review
Biochemistry & Molecular Biology
Yinghao Li, Qingwei Liao, Wei Hou, Lei Qin
Summary: The control of surface plasmon using metal micro-nano structures and metal/material composites can generate novel phenomena such as optical nonlinear enhancement, transmission enhancement, orientation effect, high sensitivity to refractive index, negative refraction, and dynamic regulation of low threshold. These phenomena have significant potential in fields such as nano-photonics, super-resolution imaging, energy, sensor detection, and life science. Silver nanoparticles, with their high sensitivity to refractive index change, convenient synthesis, and controllable shape and size, are commonly used in surface plasmon sensors. This review summarizes the basic concept, fabrication, and applications of silver-based surface plasmon sensors.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Nanoscience & Nanotechnology
Tristan C. Paul, Guy M. Hagen, Anatoliy O. Pinchuk, Kelly L. McNear
Summary: Creating sensitive and reproducible SERS substrates is a challenge. This study found that using a 405 nm laser to deposit lines of silver nanoparticles from a silver nitrate and sodium citrate solution yielded the best enhancement and consistency.
Article
Chemistry, Physical
Suresh Kumar Vemuri, Sakshum Khanna, Utsav, Sagar Paneliya, Vishakha Takhar, Rupak Banerjee, Indrajit Mukhopadhyay
Summary: Here, a facile and versatile method to decorate silver nanodomes of various sizes on zinc oxide nanorods is demonstrated. The structural, morphological, and optical behaviors of the prepared heterostructure are analyzed, confirming the formation of a close-packed structure with crystalline silver nanodomes. The enhanced surface-enhanced Raman scattering activity of the heterostructure is attributed to effective charge transport and multiple hot-spot localization.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Multidisciplinary
Weiwei Zhang, Xiaomin Zhu, Zhanghua Chen, Vladimir I. Belotelov, Yujun Song
Summary: The surface-enhanced Raman scattering (SERS) technique based on surface plasmon resonance has gained significant attention for its superior sensitivity in detecting trace levels of organic or biological molecules. However, existing research often focuses on using complex and expensive micro/nano fabrication processes to create artificial substrates for SERS, leading to high costs for masks. This paper proposes a biomimetic SERS substrate composed of silver-coated nanopillar arrays on a cicada wing, serving as both the substrate and the mask, to overcome these challenges.
Article
Chemistry, Physical
Yue Zeng, Renxian Gao, Jingyu Wang, Tien-Mo Shih, Guoya Sun, Jiasheng Lin, Yonglin He, Jiawei Chen, Da Zhan, Jinfeng Zhu, Weimin Yang, Peiwen Ren, Fangfei Jiao, Zhilin Yang
Summary: This study successfully fabricated periodic light-trapped nanocavities for SERS substrates through elaborate structure designs and material selections, overcoming difficulties and achieving ultrahigh SERS enhancement factors and uniformly distributed signal intensities.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Chen Kang, Zhoutao Sun, Xiaohui Fang, Lei Zha, Yu Han, Hongmei Liu, Jinxin Guo, Xinping Zhang
Summary: The study coated silver on the outer wall of a capillary using the silver mirror reaction and PDMS as a protective layer, creating a new platform for high-performance SERS substrates. The silver coating reduced propagation loss and extended the interaction length, achieving high sensitivity for detecting rhodamine 6G at a concentration of 10(-10) M in aqueous solution.
NANOSCALE ADVANCES
(2021)
Article
Chemistry, Analytical
Longjian Huang, Shang Qiu, Zhao Liu, Shengyue Wu, Qianli Tang, Xianjiu Liao, Fenglei Gao
Summary: In this study, a label-free and surface-enhanced Raman spectroscopy method was developed to detect carcinoembryonic antigen (CEA). The method utilized poly adenine-regulated self-assembly methods and toehold-regulated DNA displacement to achieve partial hybridization of the antigen and antibody, and amplified the CEA signals using AuNPs. The method demonstrated high sensitivity and satisfactory stability, and showed good analytical performance in determining serum CEA.
ANALYTICA CHIMICA ACTA
(2022)
Article
Chemistry, Analytical
Yuanxun Gong, Dehong Yu, Jiuying Cui, Zichun Song, Qianli Tang, Xianjiu Liao, Ning Xin, Fenglei Gao
Summary: In this study, a label-free surface-enhanced Raman scattering sensor was designed for rapid detection of apolipoprotein A4. The method showed advantages of simplicity, rapidness, and high selectivity, meeting the clinical requirements and demonstrating great potential for application.
Article
Chemistry, Analytical
Xianjiu Liao, Caiyi Zhang, Shang Qiu, Zhili Qiu, Qianli Tang, Shenyue Wu, Jie Xu, Biaoliang Wu, Zhao Liu, Fenglei Gao
Summary: A label-free method using rolling circle amplification (RCA) and gold nanoparticles (AuNPs) accumulation on a substrate was developed for SERS detection of human apolipoprotein A4. This method exhibited excellent specificity and low detection limit in the detection of human apolipoprotein A4, and could be a promising strategy for clinical diagnosis.
Article
Spectroscopy
Ziyang Shang, Liang Li, De Zhang, Cai-e Wang, Zhexiang Tang, Mingqiang Zou, Huaping Gong, Zhi Yu, Shangzhong Jin, Pei Liang
Summary: This paper presents a simple method to remove PVP for high performance and reusable SERS substrate, and the cleaned AgNPs interface effectively enhances the plasma resonance of the local surface (LSPR) and greatly improves the SERS activity of the substrate. Residual PVP has basically no influence on detection of molecules stronger than PVP, and can be ignored.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Chemistry, Physical
Scott G. Harroun, Yaoting Zhang, Tzu-Heng Chen, Huan-Tsung Chang, Alexis Vallee-Belisle
Summary: Research has shown that using silver oxide (Ag2O) as the model surface in simulating SERS can quantitatively improve accuracy.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Analytical
Alexey Skvortsov, Ekaterina Babich, Alexey Redkov, Andrey Lipovskii, Valentina Zhurikhina
Summary: The study revealed the good stability of silver nanoisland films in various biocompatible buffers, with the best performance in PBS, making them promising for biosensor applications. Additionally, it was observed for the first time that silver nanoparticles formed in the solution dissolved after exposure to PBS, while nanoislands on the glass surface remained unchanged.
Article
Chemistry, Multidisciplinary
Chiara Amicucci, Cristiano D'Andrea, Marella de Angelis, Martina Banchelli, Roberto Pini, Paolo Matteini
Summary: This paper introduces a graphene paper-supported plasmonic substrate for biodetection, which provides stable SERS signals at sub-millimolar concentration and a detection limit down to the nanogram level in the case of hemoglobin. The presence of a graphene underlayer ensures an even surface distribution of SERS hotspots and improved stability of the SERS signal.
Article
Chemistry, Physical
Natercia C. T. Martins, Sara Fateixa, Tito Trindade
Summary: In this study, hydrophobic paper-based SERS substrates with high reproducibility and uniformity were fabricated by inkjet printing Ag colloidal nanoparticles (NPs) on office paper pre-treated with chitosan (CH) or N,N,N-trimethyl chitosan (TMC). Coating the paper with these biopolymers substantially improved the SERS performance of the paper substrates. Crystal violet (CV) 100 µM was used as a molecular probe, and an increase of about 9-fold and 7-fold in the observed SERS intensity was observed when the papers were coated with CH and TMC, respectively. The coated substrates also showed improved reproducibility compared to non-coated office paper.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Analytical
Sara Fateixa, Otilio Mulandeza, Helena I. S. Nogueira, Tito Trindade
Summary: The applicability of Raman imaging extends to various aspects of pharmaceutical production, such as characterizing pharmaceutical formulations, monitoring drug delivery processes, and detecting counterfeit drugs or contaminants. This study investigates the use of Raman imaging to characterize the main components of commercial APAP tablets and identify the presence of 4-aminophenol (4-AP) as a contaminant. The results show that Raman imaging is capable of detecting small amounts of 4-AP in APAP tablets, suggesting its potential in characterizing APAP products.
VIBRATIONAL SPECTROSCOPY
(2023)
Article
Chemistry, Physical
J. G. Cuadra, S. Molina-Prados, Gladys Minguez-Vega, Ana. C. Estrada, T. Trindade, C. Oliveira, M. P. Seabra, J. Labrincha, S. Porcar, R. Cadena, D. Fraga, J. B. Carda
Summary: Transparent TiO2 thin films coated with Ag NPs were synthesized using industrially applicable techniques, without high vacuum. These films showed high transmittance (>80%) and exhibited photocatalytic and antimicrobial properties. The presence of Ag NPs on the TiO2 surface improved the photocatalytic efficiency, resulting in a 99% degradation of Rhodamine B under UV light. The films also showed significant antimicrobial activity, killing 93% of Gram-negative bacteria when irradiated by UV light for 4 hours.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Sara Fateixa, Marc Landauer, Johannes Schneider, Shanmugam Kumar, Robert Boehm
Summary: Novel low-cost materials for detecting pesticides in real water samples are demonstrated for the first time in this study. The research utilizes surface-enhanced Raman scattering (SERS) sensors enabled by additively manufactured lattices coated with plasmonic nanoparticles. The study also investigates the spatial distribution of methylene blue and silver nanoparticles on the lattice structure using SERS imaging.
MACROMOLECULAR MATERIALS AND ENGINEERING
(2023)
Article
Environmental Sciences
Luiza R. Melo de Lima, Ana C. Dias, Tito Trindade, Jose M. Oliveira
Summary: The circulation of motor vehicles with an exhaust system is a major cause of pollution, and countries are making efforts to achieve a sustainable level of air quality and limit CO2 emissions. There is significant interest in developing technological innovations such as alternative fuels and lighter thermoplastic composites for auto applications. A comparative LCA of PP-based GnPs nanocomposite and PP/GF composite for automotive applications showed that using nanocomposites can reduce the environmental impact caused by auto parts.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Materials Science, Ceramics
J. G. Cuadra, Ana C. Estrada, C. Oliveira, L. A. Abderrahim, S. Porcar, D. Fraga, T. Trindade, M. P. Seabra, J. B. Carda
Summary: Spray pyrolysis is a promising method for producing thin, transparent films on glass substrates. ZnO thin films synthesized by this method exhibit high crystallinity, adhesion and chemical resistance, and also possess the ability to degrade water pollutants and exhibit antibacterial properties. These films have exceptional optical properties and durability, and can be reused.
CERAMICS INTERNATIONAL
(2023)
Article
Polymer Science
Filipe S. Matos, Sara Fateixa, Niklas von Weymarn, Carmen S. R. Freire, Armando J. D. Silvestre, Carla Vilela
Summary: In this study, sustainable functional fibers with low environmental foot-print and superior properties were manufactured by functionalizing regenerated cellulose fibers with a natural derived phosphorus compound. The modified fibers exhibited phosphorus content up to 1.80% and a uniform and smooth surface morphology. They also showed moderate antioxidant activity, water contact angles below 92 degrees, and good thermal-oxidative stability. The flame-retardant performance of the fibers was excellent, with the fibers ceasing to burn before flaming or glowing, even after several flame applications.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Ana R. Monteiro, Catarina I. V. Ramos, Sara Fateixa, Maria G. P. M. S. Neves, Tito Trindade
Summary: This study reports a novel approach to construct arrays of ethylenediamine-modified graphene quantum dots (GQDs) and DNA oligonucleotides that can fold into different G-quadruplex structures, optimizing the efficiency of drug delivery for targeted clinical therapies.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Analytical
Natercia C. T. Martins, Sara Fateixa, Helena I. S. Nogueira, Tito Trindade
Summary: Fast detection of emerging contaminants in water resources is of great environmental interest. This study explores the application of chitosan-coated paper and silver nanoparticles for surface-enhanced Raman scattering (SERS) spectroscopy studies of two types of contaminants. The results show that the biocoated substrates have superior SERS performance compared to non-coated paper and successfully detect thiram and ciprofloxacin.
Article
Chemistry, Physical
Joana L. Lopes, Ana C. Estrada, Sara Fateixa, Nikolai A. Sobolev, Ana L. Daniel-da-Silva, Tito Trindade
Summary: This research focuses on finding a green chemical strategy to enhance the sustainability of bismuth vanadate for photocatalytic water purification. By hydrothermal carbonization of kappa-carrageenan, a biopolymer derived from red seaweeds, monoclinic BiVO4 supported on carbon spheres is successfully prepared. These hybrid materials exhibit visible-light photocatalytic activity for the removal of tetracycline in water. They possess appropriate wavelength range for photon absorption, good adsorption capacity, durability, and the ability to be reused in subsequent catalytic steps, making them cost-effective and sustainable.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Multidisciplinary
Sofia F. Soares, Joao Nogueira, Tito Trindade, Ana L. Daniel-da-Silva
Summary: Efficient removal of the antibiotic ciprofloxacin from aqueous samples using magnetic nanosorbents prepared with sulfated polysaccharides was described. The nanosorbents exhibited high adsorption capacity and could be reused.
JOURNAL OF NANOSTRUCTURE IN CHEMISTRY
(2023)
Article
Spectroscopy
Zh. E. Ozbekova, A. A. Abdyldaev, A. A. Kulmyrzaev
Summary: This study compared two drying methods for cow and yak muscles, finding that freeze drying caused less discoloration. Additionally, analysis of fluorescence spectra allowed for accurate prediction of chemical composition and color characteristics of the muscles.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Leo Mandic, Ivan Ljubic, Iva Dzeba
Summary: In this study, a combined experimental and computational approach was used to investigate the photoexcitation and photodegradation mechanisms of Doxazosin (DOX). The results provide valuable insights into the primary events following the photoexcitation of DOX and its potential applications.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Xiufeng Wang, Yao Jin, Wenhui Ai, Siqi Wang, Zhiqing Zhang, Ting Zhou, Fang Wang, Guodong Zhang
Summary: This study successfully synthesized near infrared fluorescence Ag2S quantum dots (QDs) and developed a dual-mode sensor for sulfide anion using the excellent oxidase-like characteristics of manganese dioxide (MnO2) nanosheets. The sensor showed a wider detection range, higher sensitivity, and shorter reaction time, making it suitable for highly selective detection of sulfide in different concentration ranges.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Yafei Li, Yanming Ma, Chuantao Zheng, Di Yu, Lien Hu, Shuo Yang, Fang Song, Yadan Li, Shuanghai Liu, Zhanrui Zhang, Yu Zhang, Yiding Wang, Frank K. Tittel
Summary: To effectively monitor gas explosion and coal spontaneous combustion in coal mine, an intrinsically safe and explosion-proof dual-gas sensor system was developed for methane (CH4) and carbon monoxide (CO) measurement. The system achieved different measurement ranges using laser scanning and gas cells, and improved stability and accuracy through gas pre-treatment and temperature compensation algorithm.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Pei-Rong Chen, Li-Kang Chu
Summary: In this study, the hydrates of glyoxal were investigated using infrared absorption spectrometry. The results showed that at low concentrations, glyoxal mainly exists as monomeric dihydrate. These findings provide suitable detection windows for further research on the roles of glyoxal and its hydrates in atmospheric and aerosol chemistry, as well as the relevant reaction kinetics.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Nichole O'Neill, Thamires A. Lima, Fabio Furlan Ferreira, Nicolas J. Alvarez, Reinhard Schweitzer-Stenner
Summary: This study determines the main fibril axis of GHG gel-forming fibrils using various techniques and compares the results with simulated data. The analysis suggests that the hydrophobic xz-surfaces of GHG fibrils could be a good target for the adsorption of hydrophobic drugs.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Mengyuan Liu, Hanchuang Zhu, Yikun Fang, Caiyun Liu, Xinke Li, Xiaohui Zhang, Lixue Ma, Kun Wang, Miaohui Yu, Wenlong Sheng, Baocun Zhu
Summary: ABHS is an efficient fluorescent probe that can accurately and sensitively detect Al3+ with strong resistance to interference. It also demonstrates excellent detection and imaging capabilities in complex real samples.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Ahmed S. El-Shafie, Evana Rahman, Yasser Gadelhak, Rehab Mahmoud, Marwa El-Azary
Summary: The recycling of waste mandarin peels into biochar (MRBC) has been used as a high performance and cost-effective adsorbent for treating polluted wastewater effluents. Batch adsorption studies were conducted to analyze the adsorption competency of MRBC on two dyes, methylene blue (MB) and basic fuchsin (BF), either in individual solutions or binary combinations. The results showed that MRBC was capable of effectively removing a high percentage of both dyes. However, the adsorption capacity decreased when the dyes were combined. The cost estimation of MRBC production and wastewater treatment indicated that both were relatively low.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Anindita Bhatta, Jahnabi Upadhyaya, Dipak Chamlagai, Lincoln Dkhar, Pynskhemborlang T. Phanrang, Mohan Rao Kollipara, Sivaprasad Mitra
Summary: Derivatives of thiazole-pyrazole fused benzo-coumarin compounds were synthesized and their photophysical properties were investigated. The synthesized coumarin compounds showed potential as therapeutic agents for Alzheimer's disease, inhibiting acetylcholinesterase activity. The presence of human serum albumin was found to affect the inhibition activity.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Yongwei Duan, Quancheng Liu, Yiju Zhu, Qi Zhang, Xiaohui Duan, Hu Deng, Liping Shang
Summary: In this study, the phase transition of CL-20 was observed using terahertz spectroscopy, and quantum chemical calculations were employed to analyze the vibrations. The results indicated changes in the vibrations of CL-20 before and after phase transition.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Yuefeng Gao, Sai Xu, Baojiu Chen
Summary: This study synthesized Cs2NaInCl6 nanocrystals co-doped with Sb3+ and Tb3+ ions as probes for copper ions detection in lubricating oil. The introduction of Sb3+ effectively reduced the band gap of the host material and enabled energy transfer pathway for Tb3+ emission. The doped Tb3+ ions resulted in the suppression of emission due to electron transfer. The Cs2NaInCl6: 2.5 %Sb3+, 40 %Tb3+ NCs exhibited superior sensitivity and selectivity for copper ions detection.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Yu Liu, Yue Zhang, Changyao Liu, Ce Wang, Baocai Xu, Li Zhao
Summary: A highly sensitive detection platform for heparin was developed using a cationic fluorescent dye (cresyl violet acetate) as a fluorescence probe. The platform demonstrated high selectivity towards heparin and achieved detection in both HEPES solution and serum.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Lopamudra Roy, Nivedita Pan, Susmita Mondal, Ria Ghosh, Md. Nur Hasan, Neha Bhattacharyya, Soumendra Singh, Kallol Bhattacharyya, Arpita Chattopadhyay, Samir Kumar Pal
Summary: The study focuses on the interaction between reactive oxygen species (ROS) and a spectroscopic probe called Rose Bengal (RB), encapsulated in nanoscopic sodium dodecyl sulphate (SDS) micelles and entrapped in microscopic nylon 66 solid matrix. The research demonstrates efficient interaction between ROS and RB-SDS, and investigates the mechanism of hydroxyl radicals generation. Based on these findings, a prototype device utilizing RB embedded in a nylon thin film for quantification of ROS in extracellular fluids and food materials was developed.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Xiaosong Sun, Qihao Cui, Wenyue Dong, Qian Duan, Teng Fei
Summary: Conjugated porous polymers (CPPs) are promising sensing materials and their application in aqueous media is limited. In this study, we synthesized CPPs with porous structure and prepared nanoparticles, enabling efficient photoluminescence sensing of nitroaromatic explosives in aqueous phase.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Maria Cristina Caggiani, Germana Barone, Paolo Mazzoleni
Summary: Raman spectroscopy is commonly used for studying glassy materials in cultural heritage, but it is more difficult to interpret the spectra and apply the technique with portable instruments. In contrast, diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) can be used in archaeometric investigations as it is portable and non-invasive. However, there is limited application of this technique to historical glasses. This exploratory work demonstrates the potential of DRIFTS, in combination with portable X-ray Fluorescence (pXRF) and EDS microanalyses, for studying the composition and alteration of glass samples in cultural heritage.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
