Structural and vibrational study of porous CeO2 nanoparticles

被引：12

作者：

Ascencio, Francisco ^{[1
]}

Rangel-Gamboa, Lucia ^{[2
]}

Maqueda-Cabrera, Brayan ^{[3
]}

Zorrilla, Cristina ^{[4
]}

Herrera, Raill ^{[4
]}

Mendoza-Cruz, Ruben ^{[3
]}

机构：

[1] Univ Autonoma Chapingo, Serv Agroalimentario & Forestal, Lab Nacl Invest, Chapingo, Estado De Mexic, Mexico

[2] Hosp Gen Dr Manuel Gea Gonzalez, Dept Ecol Agentes Patogenos, Subdirecc Invest, Calzada Tlalpan 4800, Mexico City 14080, Mexico

[3] Univ Nacl Autonoma Mexico, Inst Invest Mat, Circuito Investigac Cient S-N,Col Ciudad Univ, Mexico City 04510, Mexico

[4] Univ Nacl Autonoma Mexico, Inst Fis, Circuito Investigac Cient S-N,Col Ciudad Univ, Mexico City 04510, Mexico

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2024年 / 311卷

关键词：

Ceria; Raman spectroscopy; Transmission electron microscopy; CeO2; nanoparticles; OPTICAL-PROPERTIES; FROHLICH-INTERACTION; RAMAN-SPECTROSCOPY; OXYGEN DEFECTS; FILMS; SIZE; MORPHOLOGY; SCATTERING; NANOSTRUCTURES; PERFORMANCE;

D O I：

10.1016/j.matchemphys.2023.128492

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Herein, the synthesis, structural, and spectroscopic study of porous CeO2 nanoparticles is presented. The calcination temperature can tune the particle size and defect structure. The characteristic normal vibration modes were analyzed as a function of the nanoparticle size and pore concentration through Raman spectroscopy. Two different excitation sources were used, 532 nm (2.33 eV) and 780 nm (1.58 eV), to observe the resonance phenomenon of the optical phonon (LO) and its 2LO, 3LO, and 4 LO overtones, as well as their trends depending on nanoparticle size. This resonance phenomenon is attributed to an electron-phonon Fro center dot hlich interaction. X-ray diffraction and atomic-resolution transmission electron microscopy were performed to study the crystalline and defect structure of the produced particles. Micro and mesoporous were observed by HAADF and ABF imaging, determining the lattice strain present in the samples, which is related to the presence of oxygen vacancies.

引用

页数：9

共 65 条

[1] Frohlich-interaction-induced multiphonon Raman scattering in SrCuO2 and Sr0.5Ca0.5CuO2 [J].