Journal of Fluorescence最新文献

{"title":"Developing a selective and sensitive Fluoride sensing scheme by fluorimetric and chemometric optimisations using highly fluorescent boron-doped Carbon dots with a 'turn off-on' mechanism.","authors":"Babankumar S Bansod, Priyanshu Sharma","doi":"10.1007/s10895-024-04038-4","DOIUrl":"https://doi.org/10.1007/s10895-024-04038-4","url":null,"abstract":"<p><p>Fluoride detection in water is a critical issue that has received extensive attention recently. Researchers have focused on developing practical and reliable methods for detecting Fluoride in water, and fluorescent carbon dots have emerged as a promising solution. These dots are easy to synthesise, highly fluorescent and stable, making them an ideal choice for this application. In this context, highly fluorescent boron-doped Carbon Dots (BCDs) were synthesised using Urea, Citric acid, and Boric acid via microwave synthesis. Characterisation of BCDSs was performed (Photoluminescence, HR-TEM, DLS, and FTIR), showing excellent optical properties (quantum yield = 55.4%), size (< 5 nm). The BCDSs solution was used as a fluoride sensor probe using the 'turn-off-on' property. Ferric (Fe³⁺) solution was used to inhibit (turn-off) the fluorescence of the BCDs by forming BCDs-Fe³⁺ complex in the solution. The addition of a fluoride sample recovers the fluorescence (turn-on) by removing Fe³⁺ from the complex to form [FeF₆]^3-. Materials, BCDs, quencher volume and reaction time were optimised to develop a reliable fluoride sensing scheme, which included BCDs dilution, controlled turn-off by adjusting the volume of the quencher, and time dependence studies (2-15 s). A chemometric model was generated through PLS analysis to study the influence of each optimisation on the sensing performance. The result is a highly reproducible and reliable method for detecting Fluoride in water, obtaining high linearity (R² = 0.98), low error (RMSE = 0.7) and high sensitivity (LOD and LOQ of 0.69 and 2.10 ppm, respectively) for a concentration range of 0-50 ppm. Real samples were also analysed to get an overview of sensing performance. Overall, fluorescent BCDs-based and chemometric-assisted sensor optimisation schemes have shown great promise for F^- detection in water. This breakthrough could open new pathways for optical-based sensor optimisations for other hazardous ions as well, which in turn have far-reaching implications for community's worldwide, helping to ensure safe and healthy drinking water for everyone.</p>","PeriodicalId":15800,"journal":{"name":"Journal of Fluorescence","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142818292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fe-Doped Red Fluorescent Carbon Dots for Caffeine Analysis in Energy Drinks Using a Paper-Based Sensor.","authors":"Hazha Omar Othman","doi":"10.1007/s10895-024-04062-4","DOIUrl":"https://doi.org/10.1007/s10895-024-04062-4","url":null,"abstract":"<p><p>This study introduces a highly sensitive and selective method for detecting caffeine in energy drinks by using red florescence iron and nitrogen co doped carbon dots (Fe-NCDs) as a florescent prob. The Fe-NCDs were synthesized by using an eco-friendly hydrothermal. Providing uniform, quasi-spherical nanoparticles. The photoluminescence properties of the Fe-NCDs exhibit strong red emission making them suitable for fluorescence-based sensing. A microfluidic paper analytical device (µPAD) was developed and coupled with a smartphone-based detection system to facilitate portable, low-cost caffeine quantification. The Fe-NCDs were embedded in the µPADs, enabling fluorescence enhancement upon interaction with caffeine. This enhancement was quantitatively analyzed using the smartphone camera and ImageJ software, revealing a strong linear correlation in the range of 1 to 40 µg/mL when both Gray Value (G.V) and Red-Green-Blue (RGB) of reaction analyzed by the software. The limit of detection (LOD) was of 0.024 µg/mL and 0.032 µg/mL respectively for both applied principles. The methods indicate remarkable selectivity for caffeine, and was validated through accurate recovery studies in commercial samples. This innovative method provides a powerful, cost-effective, and environmentally sustainable solution for on-site caffeine detection in energy drinks, offering significant potential for application in food safety and quality control.</p>","PeriodicalId":15800,"journal":{"name":"Journal of Fluorescence","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142813323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Solid-State Fluorescence Sensor Based on SNW1 Nanoparticles for the Quantification of 2,4,6-Trinitrotoluene.","authors":"Fatemeh Moridi, Abbas Afkhami, Mahdie Kamalabadi, Tayyebeh Madrakian, Alieh Moeinipour, Abdolkarim Chehregani Rad","doi":"10.1007/s10895-024-04058-0","DOIUrl":"https://doi.org/10.1007/s10895-024-04058-0","url":null,"abstract":"<p><p>Determining 2,4,6-trinitrotoluene (TNT) in aqueous solution is of great importance for public security, environment, and public health protection. The covalent organic framework (COF) based fluoresce probes are still of interest in developing the sensor-based detection systems for TNT. So, a novel fluorescence solid-state probe based on a melamine-based COF (SNW1)for TNT detection was established for the first time. A Fluorine-doped tin oxide (FTO) was used as a substrate, and COF was electrospray deposited onto its surface (SNW1@FTO). The effective parameters including the coating time, absorption, and desorption were optimized. Upon the addition of TNT, the fluorescence of SNW1 was quenched due to an acceptor-donor interaction. Therefore, the SNW1@FTO could detect TNT as a \"Turn-off\" sensor. The SNW1 probe showed good selectivity and sensitivity toward TNT in the range of 5 to 700 µmol L^- 1. Finally, this sensor was employed to quantify TNT in real samples with satisfactory results.</p>","PeriodicalId":15800,"journal":{"name":"Journal of Fluorescence","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142801090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spectroscopic Investigation of Hydrogels Formed from Phenylalanine.","authors":"Arathy Chandran, K R Athulya, Anitha C Kumar","doi":"10.1007/s10895-024-04055-3","DOIUrl":"https://doi.org/10.1007/s10895-024-04055-3","url":null,"abstract":"<p><p>Supramolecular hydrogels assembled from amino acids, particularly offer promising prospects as biomimetic three-dimensional extracellular matrices. Phenylalanine, an aromatic amino acid, can self-assemble via hydrophobic interactions, notably through 𝜋 - 𝜋 stacking between phenyl rings. Although the self-assembly processes have been studied, the gelation mechanism of phenylalanine as an individual amino acid has received limited attention in the literature. This study focuses on investigating the gelation behavior of phenylalanine. Fluorescence spectroscopy, along with UV- Visible spectroscopy, and Fourier-transform infrared spectroscopy, were employed to elucidate the molecular interactions and the self-assembly process responsible for hydrogel formation. By leveraging fluorescence spectroscopy, this study aims to elucidate the mechanisms underlying the hydrogelation process. The fluorescence properties of the synthesized hydrogels are extensively examined, providing insights into their structural organization and stability, In this study, we employed a simple heating-cooling method for preparing phenylalanine hydrogel resulting in the formation of opaque hydrogels. Spectral analyses revealed the molecular interactions and structural organization, highlighting the relationship between concentration, opacity, and gel properties. Through this study, we investigated the gelation mechanism of a simple molecule using fluorescence spectroscopy, which provides a foundation for exploring the use of the same in other hydrogel-forming systems.</p>","PeriodicalId":15800,"journal":{"name":"Journal of Fluorescence","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142801091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Hemicyanin-Based Water-Soluble off-on Fluorescence and Colorimetric Probe for Detecting HSO₃^-/SO₃^2- in Real Samples.","authors":"Akshay Kodiyawala, Sahil Kiroriwal, Suban K Sahoo, Tapas Ghatak, Subrata Dutta","doi":"10.1007/s10895-024-04040-w","DOIUrl":"https://doi.org/10.1007/s10895-024-04040-w","url":null,"abstract":"<p><p>A fluorescence and colorimetric sensor (AHT) was developed to detect HSO₃^-/SO₃^2- in a 10 mM aqueous PBS buffer at pH 7.4. AHT exhibits non-fluorescence in the buffer due to the intramolecular charge transfer (ICT). The detection of HSO₃⁻/SO₃²⁻ by probe AHT occurs through nucleophilic addition to its carbon-carbon double bond, which disrupts conjugation and stops the ICT process. This reaction induced a visible color change from violet to colorless and activated fluorescence from \"off\" to \"on\" at 485 nm (λ_ex = 420 nm). The probe exhibited significant selectivity and sensitivity for HSO₃⁻/SO₃²⁻, with a detection limit of 51.5 nM and a rapid response time. Additionally, it effectively detected HSO₃⁻/SO₃²⁻ in real samples, e.g., sugar, water, wine, and biscuits.</p>","PeriodicalId":15800,"journal":{"name":"Journal of Fluorescence","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142801088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Concentration of TiO₂ Nanoparticles on Thiadiazole Derivative and Their Molecular Docking Study.","authors":"Shivaprasadagouda Patil, Mahanthesh M Basanagouda, S Christopher Jeyaseelan, Bi Bi Ayisha Mulla, Gangadhar V Muddapur, Uday M Muddapur, Ashok H Sidarai","doi":"10.1007/s10895-024-04051-7","DOIUrl":"https://doi.org/10.1007/s10895-024-04051-7","url":null,"abstract":"<p><p>In the present work, we report the synthesis of TiO₂ nanoparticles by hydrothermal method using titanium isopropoxide. The synthesized TiO₂ nanoparticles were investigated by Powder X-ray diffraction, FE-SEM with EDX, Photoluminescence, UV-Visible absorption and Fluorescence emission spectroscopy. Fluorescence intensity and absorption values of 4-[5-(2,5-Dimethyl-pyrrol-1-yl)-[1,3,4]thiadiazol-2-ylsulfanylmethyl]-6-methoxy-chromen-2-one (DTYMC) molecule decreases with adding the concentration of TiO₂ nanoparticles. Stern-Volmer equation for steady state method is found to be linear and its co-relation coefficient is found to be r = 0.88, which indicates the presence of dynamic quenching. Binding orientations of the DTYMC ligand with targeted proteins are Thymidylate synthase (TS) - PDB ID: 1JU6, The type II topoisomerases (TOP2α) - PDB ID: 4FM9 and Human thymidine phosphorylase (hTP) - PDB ID: 2WK6. The obtained result suggests that, the DTYMC molecule exhibits inhibitory activity against the overexpression of TS receptor which causes non-small cell lung cancer (NSCLC). Antimicrobial study of TiO₂ NPs has been determined.</p>","PeriodicalId":15800,"journal":{"name":"Journal of Fluorescence","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142791839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of Carbon Quantum Dots Combined with Cu₂O Nanocubes and Their Application in Metals Ion Detection.","authors":"Ngo Nguyen Tra My, Tran Thi Bich Quyen, Tran Minh Khang, Bui Le Anh Tuan, Duy Toan Pham","doi":"10.1007/s10895-024-04060-6","DOIUrl":"https://doi.org/10.1007/s10895-024-04060-6","url":null,"abstract":"<p><p>In this study, carbon quantum dots/Cu₂O nanocubes (CQDs/Cu₂O NCBs) nanomaterial has been successfully synthesized using a simple and easy-to-implement method with a quick reaction time (90 min) at 80°C. In particular, carbon quantum dots (CQDs) were obtained by green and environmentally friendly synthesis methods, using abundant and naturally available raw materials from rice flour and applying hydrothermal approach. Besides, cuprous oxide nanocubes (Cu₂O NCBs) were also synthesized through non-toxic compounds. The morphology and composition of CQDs/Cu₂O NCBs and Cu₂O NCBs were analyzed through UV-vis, FTIR, XRD, FE-SEM, TEM, and EDX spectroscopy. The results showed that Cu₂O NCBs have a cubic shape with an average particle size of ~ 29-31 nm, and CQDs have spherical shape with a size of ~ 4-8 nm. In addition, CQDs/Cu₂O NCBs nanomaterial was also employed as a \"turn-on\" fluorescence sensor\" for application in metal ions detection. The obtained results showed that the CQDs/Cu₂O NCBs are potential and promising in detecting Pb²⁺ ions in the wide range from 1.8 M to 10^- 9 M and extremely low limit of detection of 27.8 nM at the excitation wavelength of 340 nm. CQDs/Cu₂O NCBs-based sensors are highly sensitive and selective for Pb²⁺ detection. Therefore, CQDs/Cu₂O are promising as photocatalytic materials for various applications, including sensors, bio-probes biomedical, optoelectronics, etc.</p>","PeriodicalId":15800,"journal":{"name":"Journal of Fluorescence","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142791934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bifunctional MOFs Nanozyme with Peroxidase Activity and Stimulus-responsive Fluorescent for Determination of Glyphosate.","authors":"Yu-Meng Guo, Zi-Chong Chen, Kai-Xiang Zhang, Liu-Lu Liu, Chan Huang, Qing Li","doi":"10.1007/s10895-024-04057-1","DOIUrl":"https://doi.org/10.1007/s10895-024-04057-1","url":null,"abstract":"<p><p>Establishing a fast and simple method for determining glyphosate (Glyp) is crucial for safeguarding the environment and protecting human well-being. In this work, a copper benzenedicarboxylate (CuBDC) metal-organic frameworks (MOFs) with peroxidase-like property and stimulus-responsive fluorescent was prepared by binding Cu²⁺ with terephthalic acid (TA). The presence of Glyp can coordination with Cu²⁺ ion and block the peroxidase-like properties of CuBDC, thereby suppressing the catalysis the oxidation of TA into fluorescent product 2-hydroxyterephthalic acid (HTA). Based on these facts, a simple, rapid and sensitive fluorescence detection strategy for Glyp was developed. The fluorescence decreases linearly in the 0.5-10 µg/mL Glyp concentration range, and the limit of detection was calculated to be 23.99 ng/mL. Furthermore, the dual-functional CuMOFs-based label-free strategy was effectively employed for detecting Glyp in river water samples. With good performance and practicability, this strategy provides a potential application in the convenient and reliable determination of Glyp in the environment.</p>","PeriodicalId":15800,"journal":{"name":"Journal of Fluorescence","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142791823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of Photoluminescence and Thermoluminescence Properties of Tb³⁺ Doped Green Emitting YPO₄ Nanophosphors.","authors":"Khundrakpam Chanchan Devi, Ritesh Hemam, S Dorendrajit Singh","doi":"10.1007/s10895-024-04061-5","DOIUrl":"https://doi.org/10.1007/s10895-024-04061-5","url":null,"abstract":"<p><p>YPO₄ nanophosphors doped with different concentrations of Tb³⁺ were synthesized using conventional co-precipitation method. The crystalline as well structural features were studied by using powder X-ray diffraction (PXRD) as well as Transmission electron microscope (TEM) images, which revealed highly crystalline nature of the prepared samples having particle sizes of around 40 nm. EDAX spectrum also shows the elemental composition of the synthesized nanoparticles which contain Y, P, O, Tb³⁺as expected. Prepared samples showed emission peaks at 491, 545, 588 and 624 nm under UV excitation having excitation wavelengths of 223 and 320 nm. The Commission International de I'Eclairage (CIE)study shows the chromaticity co-ordinates for the 600^oC annealed samples to be x = 0.239, y = 0.4 which corresponds to cool greenish light suggesting the potential applications of the prepared nanophosphor in white light emitting diodes converted from green phosphors, optical display setups and PDP applications. Thermoluminescence (TL) study was carried out after exposing the samples 5at.wt% Tb³⁺ doped YPO₄ to gamma radiations. Kinetic parameters were calculated using Deconvolution method.</p>","PeriodicalId":15800,"journal":{"name":"Journal of Fluorescence","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142791876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis and Luminescence Characterization of Novel Red-Emitting Phosphors Based on Eu³⁺-Activated K₂Sr(MoO₄)₂ Molybdates for w-LEDs.","authors":"Huapeng Sun, Meili Yang, Anlin Zhang, Yanhua Lei, Bin Deng","doi":"10.1007/s10895-024-04059-z","DOIUrl":"https://doi.org/10.1007/s10895-024-04059-z","url":null,"abstract":"<p><p>In this work, trivalent europium (Eu³⁺) ion activated K₂Sr(MoO₄)₂ red phosphors have been synthesized through high-temperature solid-state reaction method at 750 ℃. Detailed analysis was conducted on the phase purity, morphology, and luminescence properties of the synthesized phosphors. X-ray diffraction (XRD) confirmed the successful formation of K₂Sr(MoO₄)₂:Eu³⁺ phosphors with pure phase with space group С_2/c. The photoluminescence (PL) spectroscopy was used to record the excitation and emission spectrum of Eu³⁺ activated K₂Sr(MoO₄)₂ phosphor. Under the excitation of 280 nm, the resultant samples exhibited the characteristic emissions of Eu³⁺ ions corresponding to the ⁵D₀→⁷F_J transitions. The optimal doping concentration of Eu³⁺ ions was determined to be 35 mol%. Concentration quenching mechanism was identified as the interaction of near-neighbor ions. The chromaticity coordinates of K₂Sr(MoO₄)₂:35 mol%Eu³⁺ were (0.659, 0.340) with a corresponding high color purity of 99.8%. The prepared K₂Sr(MoO₄)₂:35 mol%Eu³⁺ phosphor had good thermal stability with temperature quenching temperature (T_0.5 > 420 K) and high activation energy (E_a = 0.267 eV). The exhaustive findings from this study form the basis for advocating the application of these phosphors in light-emitting devices.</p>","PeriodicalId":15800,"journal":{"name":"Journal of Fluorescence","volume":" ","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142791925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}