Journal of Applied Spectroscopy最新文献_第7页

Synthesis and Optical Properties of Neodymium-doped Perovskite Quantum Dots 掺钕钙钛矿量子点的合成及其光学性质

IF 0.7 4区化学

Journal of Applied Spectroscopy Pub Date : 2026-07-18 DOI: 10.1007/s10812-026-02092-3

A. M. Pshukov, A. A. Kokoeva, N. E. Pukhaeva

{"title":"Synthesis and Optical Properties of Neodymium-doped Perovskite Quantum Dots","authors":"A. M. Pshukov, A. A. Kokoeva, N. E. Pukhaeva","doi":"10.1007/s10812-026-02092-3","DOIUrl":"10.1007/s10812-026-02092-3","url":null,"abstract":"Colloidal quantum dots of mixed-halide perovskite CsPb0.8Nd0.2BrCl2 containing Nd3+ ions have been synthesized and characterized. These nanocrystals were obtained by hot injection followed by purification and transfer to a stable organic dispersion, which provides for the reproducible formation of Nd-containing particles with persistent colloidal stability. The samples exhibited intense blue photoluminescence with a maximum at 457–458 nm and a narrow emission band. The excitation–emission matrix showed that the position of the luminescence band remains virtually unchanged upon variation of the excitation wavelength, indicating the relative homogeneity of the emitting states. The decay kinetics is described by a monoexponential curve with a characteristic time of 6.7 ns. The photoluminescence quantum yield indicates a fairly high proportion of radiative recombination. Morphological analysis, DLS and EDX mapping all confirm the formation of nanoparticles containing the major elements of the initial composition including neodymium. The combined chloride substitution and introduction of Nd3+ ions is shown to be an effective approach to obtaining blue-emitting perovskite nanocrystals, which hold promise for use in optoelectronics, photonics, and scintillation applications.","PeriodicalId":609,"journal":{"name":"Journal of Applied Spectroscopy","volume":"93 3","pages":"570 - 575"},"PeriodicalIF":0.7,"publicationDate":"2026-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752311","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}

引用次数: 0

Specific-Intensity Clustering Method for Reducing Matrix Effect in Quantitative Analysis of Laser-Induced Breakdown Spectroscopy 减少激光诱导击穿光谱定量分析中基质效应的比强度聚类方法

IF 0.7 4区化学

Journal of Applied Spectroscopy Pub Date : 2026-07-08 DOI: 10.1007/s10812-026-02098-x

Qingzhou Li, Ruiya Xu, Wen Han, Shenrui Yu, Han Xu, Chunfa Dong, Lei Xu

{"title":"Specific-Intensity Clustering Method for Reducing Matrix Effect in Quantitative Analysis of Laser-Induced Breakdown Spectroscopy","authors":"Qingzhou Li, Ruiya Xu, Wen Han, Shenrui Yu, Han Xu, Chunfa Dong, Lei Xu","doi":"10.1007/s10812-026-02098-x","DOIUrl":"10.1007/s10812-026-02098-x","url":null,"abstract":"In laser-induced breakdown spectroscopy (LIBS), the quantitation accuracy with traditional standard calibration methods is often unsatisfactory, mainly because of the matrix effect. In this work, a novel method named specific-intensity clustering (SIC) was proposed to mitigate the influence of the matrix effect. The specific-intensity, which is defined as the ratio of the spectrum intensity to element concentration, is considered an essential characteristic of a sample. These specific-intensity features facilitate the effective clustering of calibration samples, thereby enabling the establishment of multiple, more robust, calibration curves. By combining the clustered calibration samples with machine-learning algorithms, a classification model was established. Unknown samples can be classified by the classification model and predicted by the proper calibration curve. The feasibility of the proposed SIC method was verified through the detection of CaO, TFe2O3, and Li in rock samples. Compared with traditional standard calibration methods, the SIC method significantly reduced the average relative errors of the prediction set (AREPs) for the detected CaO, TFe2O3, and Li elements in rocks, with the AREPs decreasing from 25.292, 14.114, and 14.12% to 6.165, 5.481, and 5.137%, respectively. This work demonstrates that the SIC method has excellent potential for reducing the influence of the matrix effect in LIBS quantitation.","PeriodicalId":609,"journal":{"name":"Journal of Applied Spectroscopy","volume":"93 3","pages":"619 - 630"},"PeriodicalIF":0.7,"publicationDate":"2026-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751253","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}

引用次数: 0

Development and Validation of a Spectrofluorimetric Method for Estimation of Mycophenolate Mofetil in Bulk and in Formulation 用荧光光谱法测定原料药和制剂中霉酚酸酯的含量

IF 0.7 4区化学

Journal of Applied Spectroscopy Pub Date : 2026-07-07 DOI: 10.1007/s10812-026-02108-y

Priyanshi Sharma, Alka Bali, Kanade Krushna Devrao

{"title":"Development and Validation of a Spectrofluorimetric Method for Estimation of Mycophenolate Mofetil in Bulk and in Formulation","authors":"Priyanshi Sharma, Alka Bali, Kanade Krushna Devrao","doi":"10.1007/s10812-026-02108-y","DOIUrl":"10.1007/s10812-026-02108-y","url":null,"abstract":"Mycophenolate mofetil is an immunosuppressive agent approved by the Food and Drug Administration. The present report describes the validation of two simple, economical, and highly sensitive spectrofluorimetric methods based on the native fluorescence of the drug in ethanol and in alkaline medium. Fluorescence characteristics of the drug were found to significantly differ in absolute ethanol (λex = 268 nm and λem = 426 nm) and in NaOH (λex = 359 nm and λem = 434 nm). Both the methods were validated as per the ICH guidelines. Stress degradation studies were conducted on the drug as per the ICH guidelines and excellent recovery from the stressed samples suggested the stability-indicating nature of the methods. The two methods were found to be extremely sensitive, precise, and accurate, demonstrating excellent linearity in the concentration ranges 0.5–15.0 μg/mL (absolute ethanol) and 0.1–8.0 μg/mL (NaOH). The limit of detection and limit of quantitation values were found to be 0.52 and 1.57 μg/mL (absolute ethanol), and 0.02 and 0.07 μg/mL (NaOH), respectively. The proposed methods afforded excellent recovery of mycophenolate mofetil from its marketed tablet formulation, thus suggesting that these methods could be employed for routine analysis of the drug in bulk as well as in formulation.","PeriodicalId":609,"journal":{"name":"Journal of Applied Spectroscopy","volume":"93 3","pages":"697 - 704"},"PeriodicalIF":0.7,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751238","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}

引用次数: 0

Mass-Transfer Enhancement of Heavy Oil Molecules in Hierarchical FCC Catalysts: an in situ Visualization Study Via Fluorescence Imaging 分级催化裂化催化剂中重油分子的传质增强：荧光成像原位可视化研究

IF 0.7 4区化学

Journal of Applied Spectroscopy Pub Date : 2026-07-07 DOI: 10.1007/s10812-026-02105-1

Meihua Zhang, Huan Wang, Li Zhang, Qin Tang, Lei Yu, Cailin Chen, Huimin Guan, Yucai Qin, Lijuan Song

{"title":"Mass-Transfer Enhancement of Heavy Oil Molecules in Hierarchical FCC Catalysts: an in situ Visualization Study Via Fluorescence Imaging","authors":"Meihua Zhang, Huan Wang, Li Zhang, Qin Tang, Lei Yu, Cailin Chen, Huimin Guan, Yucai Qin, Lijuan Song","doi":"10.1007/s10812-026-02105-1","DOIUrl":"10.1007/s10812-026-02105-1","url":null,"abstract":"This study employed advanced in situ visualization techniques to investigate the mass-transfer enhancement mechanisms of heavy oil components in fluid catalytic cracking (FCC) catalysts. Three FCC catalysts with different matrix compositions were selected: CAT-1 (kaolin), CAT-2 (kaolin/APM-7), and CAT-3 (kaolin/APM-9). Their pore structures were systematically characterized using SEM and N2 adsorption–desorption. In situ visualization of the diffusion of Rhodamine B-tagged heavy oil components (probe size: 2–5 nm) within the catalyst pores was achieved by laser confocal fluorescence microscopy at a resolution of 200 nm. The results demonstrated that CAT-3, modified with APM-9, exhibited an optimal mesoporous structure (with 35% of pores in the 3–5 nm range) and achieved an effective diffusion coefficient of 1.84 × 10–13 m2/s, which is 7.3 times higher than that of the conventional kaolin-based CAT-1. Analysis using the Yoon–Nelson model further confirmed a 68% reduction in the adsorption rate constant for CAT-3, revealing the synergistic enhancement effect between hierarchical pore channels and acid sites. This study established a quantitative structure–performance relationship between pore architecture and mass transfer in FCC catalysts, facilitated by the development of an in situ fluorescence visualization technique for probing diffusion within porous materials. This study not only provides a quantitative \"pore structure–mass transfer\" relationship model for the rational design of FCC catalysts, but also offers a novel characterization method with high spatiotemporal resolution for investigating the mass-transfer mechanism of porous materials.","PeriodicalId":609,"journal":{"name":"Journal of Applied Spectroscopy","volume":"93 3","pages":"673 - 682"},"PeriodicalIF":0.7,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751237","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}

引用次数: 0

Quantitative Detection of Acetamiprid in Black Tea Based on Ultraviolet Absorption Spectroscopy and Chemometrics 基于紫外吸收光谱和化学计量学的红茶中啶虫脒的定量检测

IF 0.7 4区化学

Journal of Applied Spectroscopy Pub Date : 2026-07-06 DOI: 10.1007/s10812-026-02104-2

Delong Meng, Xiaolei Yu, Lingyun Xu, Zhenlu Liu, Zhimin Zhao

{"title":"Quantitative Detection of Acetamiprid in Black Tea Based on Ultraviolet Absorption Spectroscopy and Chemometrics","authors":"Delong Meng, Xiaolei Yu, Lingyun Xu, Zhenlu Liu, Zhimin Zhao","doi":"10.1007/s10812-026-02104-2","DOIUrl":"10.1007/s10812-026-02104-2","url":null,"abstract":"To achieve nondestructive and accurate detection of acetamiprid (ACE) in black tea, a method based on ultraviolet (UV) absorption spectroscopy and chemometrics is proposed. First, the absorption spectra of 60 black tea samples containing varying ACE concentrations are acquired using a UV-visible spectrophotometer. Afterward, the eff ective variables are extracted by bootstrapping soft shrinkage (BOSS), the successive projections algorithm (SPA), and the competitive adaptive reweighted sampling (CARS) algorithm. Finally, the prediction models are developed using partial least-squares regression (PLSR) and gray wolf optimizer least-squares support vector regression (GWO–LSSVR). The results demonstrate that the CARS–GWO–LSSVR model performs best, with a determination coefficient (R2p) and root mean square error for the prediction set (RMSEP) of 0.9991 and 0.0994 mg/L, respectively. Furthermore, to assess the feasibility of the proposed method under interference from other pesticides, experiments are conducted using imidacloprid as an interferent. The results demonstrate that the method exhibits high-precision detection of ACE in black tea even in the presence of such interference. Thus, UV absorption spectroscopy combined with chemometrics can achieve nondestructive and accurate detection of ACE in black tea.","PeriodicalId":609,"journal":{"name":"Journal of Applied Spectroscopy","volume":"93 3","pages":"665 - 672"},"PeriodicalIF":0.7,"publicationDate":"2026-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750783","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}

引用次数: 0

Synthesis and Luminescence Properties of BaAl2B2O7:RE (RE = Dy3+ and Sm3+) for Optoelectronic Application 光电子用BaAl2B2O7:RE （RE = Dy3+和Sm3+）的合成及发光性能

IF 0.7 4区化学

Journal of Applied Spectroscopy Pub Date : 2026-07-06 DOI: 10.1007/s10812-026-02099-w

İlhan Pekgözlü, Ali Sadi Başak

引用次数: 0

Tailoring Sm3+ Emission of NaBaPO4 Phosphors by Local Symmetry Engineering at Crystallographic Sites 用局部对称工程在晶体位置裁剪NaBaPO4荧光粉的Sm3+发射

IF 0.7 4区化学

Journal of Applied Spectroscopy Pub Date : 2026-07-06 DOI: 10.1007/s10812-026-02101-5

Xiuyuan Zuo, Baolai Qin, Yumeng Li, Yilin Wangliu, Jiaqi Li, Hai Liang

{"title":"Tailoring Sm3+ Emission of NaBaPO4 Phosphors by Local Symmetry Engineering at Crystallographic Sites","authors":"Xiuyuan Zuo, Baolai Qin, Yumeng Li, Yilin Wangliu, Jiaqi Li, Hai Liang","doi":"10.1007/s10812-026-02101-5","DOIUrl":"10.1007/s10812-026-02101-5","url":null,"abstract":"A systematic investigation was carried out on samarium (Sm3+)-doped NaBaPO4 orange-yellow-emitting phosphors synthesized via a solid-state process in an air atmosphere, focusing on determining how the crystallization behavior and luminescence mechanisms are affected by the calcination time and dopant concentration. The phase formation and optical properties were characterized using thermogravimetry, X-ray powder diffraction, and photoluminescence spectroscopy. The results demonstrate that the sample calcined at 750° forms the main phase of hexagonal NaBaPO4 (space group (Poverline{3 }ml)), which contains two distinct crystallographic sites for Ba2+ ions. Excitation at 400 nm reveals strong near-UV absorption, indicating suitability for matching LED devices. The emission spectra exhibit transitions at 564 nm (4G5/2 → 6H5/2, magnetic dipole), 600 nm (4G5/2 → 6H7/2, mixed character), and 644 nm (4G5/2 → 6H9/2, electric dipole). The hypersensitivity of the 4G5/2 → 6H9/2 transition to the local crystal field enables precise emission tuning via symmetry engineering. Variations in the red-to-green intensity ratio of the emission peaks with Sm3+ content allow modulation of the chromaticity coordinates and color purity. Among the investigated samples, the maximum emission intensity is achieved by NaBa0.97PO4:0.03Sm3+, for which the quenching mechanism is identified as multipole–multipole interactions. Additionally, the highest color purity (96.3%) is also achieved by this phosphor, exhibiting a highly saturated color.","PeriodicalId":609,"journal":{"name":"Journal of Applied Spectroscopy","volume":"93 3","pages":"642 - 650"},"PeriodicalIF":0.7,"publicationDate":"2026-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750777","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}

引用次数: 0

Development and Validation of a Near-Infrared Spectroscopy Method for Quantification of the Fidaxomicin in Tablets 近红外光谱法测定片剂中非达霉素含量的建立与验证

IF 0.7 4区化学

Journal of Applied Spectroscopy Pub Date : 2026-07-06 DOI: 10.1007/s10812-026-02107-z

Sunita Sunil Gagare, Priyanka Jagannath Bandgar, Ashish Suresh Jain

{"title":"Development and Validation of a Near-Infrared Spectroscopy Method for Quantification of the Fidaxomicin in Tablets","authors":"Sunita Sunil Gagare, Priyanka Jagannath Bandgar, Ashish Suresh Jain","doi":"10.1007/s10812-026-02107-z","DOIUrl":"10.1007/s10812-026-02107-z","url":null,"abstract":"A novel analytical method using reflectance NIRS combined with PLS multivariate calibration to determine fidaxomicin in tablet formulations has been developed and validated. NIR diffuse reflectance spectroscopy in reflectance mode is a versatile technique used for analyzing the optical properties of materials by combining reflection and transmission measurements. Partial least squares regression was used to establish the relationship between the IR peaks and fidaxomicin concentrations in a known standard. Metrics evaluated included correlation coefficient (R2), root mean squared error of cross-validation (RMSECV), bias, and relative percentage difference (RPD). Figures of merit, including linearity, precision, accuracy, ruggedness, selectivity, and analytical sensitivity, were assessed in accordance with ICH guidelines. Model performance was as follows: R2 = 99.9, indicating excellent predictive capability; RMSECV = 4.19, reflecting low prediction error; bias 0.639; RPD 31.3. The method was validated as linear, precise, accurate, and rugged. The proposed NIR-PLS method is a viable alternative to HPLC for fidaxomicin quantification, offering advantages in speed, simplicity, cost, and environmental sustainability. By adhering to ICH guidelines, the method demonstrated reliability and applicability for routine pharmaceutical quality control.","PeriodicalId":609,"journal":{"name":"Journal of Applied Spectroscopy","volume":"93 3","pages":"690 - 696"},"PeriodicalIF":0.7,"publicationDate":"2026-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148750710","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}

引用次数: 0

Development of a Detector for a Portable Atomic Emission and Fluorescence Sensor 便携式原子发射与荧光传感器探测器的研制

IF 0.7 4区化学

Journal of Applied Spectroscopy Pub Date : 2026-07-06 DOI: 10.1007/s10812-026-02094-1

I. N. Krylov, S. S. Verzheniuk, D. I. Sokolov, T. A. Labutin

引用次数: 0

Research on Rapid Detection of Microplastics in Flowing Water Based on Raman Spectroscopy 基于拉曼光谱的流动水中微塑料快速检测研究

IF 0.7 4区化学

Journal of Applied Spectroscopy Pub Date : 2026-07-06 DOI: 10.1007/s10812-026-02103-3

Qingsheng Xue, Lili Liu, Fengqin Lu, Guiting Yu

引用次数: 0