{"title":"mn掺杂ZnWO4/GO纳米复合粉体光学性能的增强","authors":"Sadegh Azadmehr, Sanaz Alamdari, Majid Jafar Tafreshi","doi":"10.1140/epjp/s13360-025-06807-x","DOIUrl":null,"url":null,"abstract":"<div><p>Luminescent materials are indispensable in radiation detection, displays, and biophotonics because they convert high-energy stimuli into visible photons. Here, manganese-doped zinc tungstate/graphene oxide nanocomposite powders (ZnWO₄/GO:Mn) were synthesized via a facile two-step co-precipitation–calcination route. Comprehensive structural, optical, and scintillation characterizations were performed. X-ray diffraction/Rietveld refinement confirmed the monoclinic wolframite ZnWO₄ phase, while SEM/TEM revealed predominantly spherical-to-polyhedral particles with an average diameter of (330 ± 20) nm anchored on partially reduced GO sheets. Energy-dispersive X-ray spectroscopy verified the uniform presence of Zn, W, Mn, C, and O, and FTIR identified characteristic W–O (600–800 cm⁻<sup>1</sup>), C=O (1730 cm⁻<sup>1</sup>), and O–H (3400 cm⁻<sup>1</sup>) vibrations. Photoluminescence under 365-nm excitation showed that Mn<sup>2</sup>⁺ doping boosts the green emission peak at 545 nm, producing ∼40% higher intensity than undoped ZnWO₄/GO, owing to transitions of Mn<sup>2</sup>⁺ centers and improved charge separation through the GO network. Ion-beam-induced luminescence and <sup>241</sup>Am α-particle tests demonstrated a 40% higher photon yield for ZnWO₄/GO:Mn compared with pristine ZnWO₄, highlighting its scintillation potential. Nitrogen adsorption–desorption measurements gave a Type IV–H3 isotherm, indicating slit-like mesoporosity. The nanocomposite exhibits a BET surface area of 0.371 ± 0.02 m<sup>2</sup> g<sup>−1</sup>, a total pore volume of 0.0185 cm<sup>3</sup> g<sup>−1</sup>, and a BJH pore-size maximum at ∼6.6 nm, arising from interlayer voids between GO sheets and ZnWO₄ grains. These synergistic structural and opto-scintillation enhancements position ZnWO₄/GO:Mn nanoparticles as promising candidates for next-generation optoelectronic applications.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 9","pages":""},"PeriodicalIF":2.9000,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Enhanced optical properties of Mn-doped ZnWO4/GO nanocomposite powders\",\"authors\":\"Sadegh Azadmehr, Sanaz Alamdari, Majid Jafar Tafreshi\",\"doi\":\"10.1140/epjp/s13360-025-06807-x\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Luminescent materials are indispensable in radiation detection, displays, and biophotonics because they convert high-energy stimuli into visible photons. Here, manganese-doped zinc tungstate/graphene oxide nanocomposite powders (ZnWO₄/GO:Mn) were synthesized via a facile two-step co-precipitation–calcination route. Comprehensive structural, optical, and scintillation characterizations were performed. X-ray diffraction/Rietveld refinement confirmed the monoclinic wolframite ZnWO₄ phase, while SEM/TEM revealed predominantly spherical-to-polyhedral particles with an average diameter of (330 ± 20) nm anchored on partially reduced GO sheets. Energy-dispersive X-ray spectroscopy verified the uniform presence of Zn, W, Mn, C, and O, and FTIR identified characteristic W–O (600–800 cm⁻<sup>1</sup>), C=O (1730 cm⁻<sup>1</sup>), and O–H (3400 cm⁻<sup>1</sup>) vibrations. Photoluminescence under 365-nm excitation showed that Mn<sup>2</sup>⁺ doping boosts the green emission peak at 545 nm, producing ∼40% higher intensity than undoped ZnWO₄/GO, owing to transitions of Mn<sup>2</sup>⁺ centers and improved charge separation through the GO network. Ion-beam-induced luminescence and <sup>241</sup>Am α-particle tests demonstrated a 40% higher photon yield for ZnWO₄/GO:Mn compared with pristine ZnWO₄, highlighting its scintillation potential. Nitrogen adsorption–desorption measurements gave a Type IV–H3 isotherm, indicating slit-like mesoporosity. The nanocomposite exhibits a BET surface area of 0.371 ± 0.02 m<sup>2</sup> g<sup>−1</sup>, a total pore volume of 0.0185 cm<sup>3</sup> g<sup>−1</sup>, and a BJH pore-size maximum at ∼6.6 nm, arising from interlayer voids between GO sheets and ZnWO₄ grains. These synergistic structural and opto-scintillation enhancements position ZnWO₄/GO:Mn nanoparticles as promising candidates for next-generation optoelectronic applications.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>\",\"PeriodicalId\":792,\"journal\":{\"name\":\"The European Physical Journal Plus\",\"volume\":\"140 9\",\"pages\":\"\"},\"PeriodicalIF\":2.9000,\"publicationDate\":\"2025-09-16\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"The European Physical Journal Plus\",\"FirstCategoryId\":\"4\",\"ListUrlMain\":\"https://link.springer.com/article/10.1140/epjp/s13360-025-06807-x\",\"RegionNum\":3,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"PHYSICS, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"The European Physical Journal Plus","FirstCategoryId":"4","ListUrlMain":"https://link.springer.com/article/10.1140/epjp/s13360-025-06807-x","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
Enhanced optical properties of Mn-doped ZnWO4/GO nanocomposite powders
Luminescent materials are indispensable in radiation detection, displays, and biophotonics because they convert high-energy stimuli into visible photons. Here, manganese-doped zinc tungstate/graphene oxide nanocomposite powders (ZnWO₄/GO:Mn) were synthesized via a facile two-step co-precipitation–calcination route. Comprehensive structural, optical, and scintillation characterizations were performed. X-ray diffraction/Rietveld refinement confirmed the monoclinic wolframite ZnWO₄ phase, while SEM/TEM revealed predominantly spherical-to-polyhedral particles with an average diameter of (330 ± 20) nm anchored on partially reduced GO sheets. Energy-dispersive X-ray spectroscopy verified the uniform presence of Zn, W, Mn, C, and O, and FTIR identified characteristic W–O (600–800 cm⁻1), C=O (1730 cm⁻1), and O–H (3400 cm⁻1) vibrations. Photoluminescence under 365-nm excitation showed that Mn2⁺ doping boosts the green emission peak at 545 nm, producing ∼40% higher intensity than undoped ZnWO₄/GO, owing to transitions of Mn2⁺ centers and improved charge separation through the GO network. Ion-beam-induced luminescence and 241Am α-particle tests demonstrated a 40% higher photon yield for ZnWO₄/GO:Mn compared with pristine ZnWO₄, highlighting its scintillation potential. Nitrogen adsorption–desorption measurements gave a Type IV–H3 isotherm, indicating slit-like mesoporosity. The nanocomposite exhibits a BET surface area of 0.371 ± 0.02 m2 g−1, a total pore volume of 0.0185 cm3 g−1, and a BJH pore-size maximum at ∼6.6 nm, arising from interlayer voids between GO sheets and ZnWO₄ grains. These synergistic structural and opto-scintillation enhancements position ZnWO₄/GO:Mn nanoparticles as promising candidates for next-generation optoelectronic applications.
期刊介绍:
The aims of this peer-reviewed online journal are to distribute and archive all relevant material required to document, assess, validate and reconstruct in detail the body of knowledge in the physical and related sciences.
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