Fuel-oxidizer ratio tuned luminescence properties of combustion synthesized Europium doped cerium oxide nanoparticles and its effect on antioxidant properties

Ionic Radii and Concentration Dependency of RE3+ (Eu3+, Nd3+, Pr3+, and La3+)-Doped Cerium Oxide Nanoparticles for Enhanced Multienzyme-Mimetic and Hydroxyl Radical Scavenging Activity

“…Cerium oxide or ceria nanoparticles (CNPs) are widely used in catalysis, hydrogen production, solid oxide fuel cells, biomedicine, and so forth. CNPs also mimic various activities of antioxidant enzymes such as superoxide dismutase (SOD), catalase, oxidase, and peroxidase, and hydroxyl radical scavenging . Not limited to the antioxidant therapy, the biomimetic properties of CNPs such as peroxidase and oxidase are highly useful in the detection of glucose, nucleic acid, cancer, pathogens, and so forth. − Hirst et al demonstrated the anti-inflammatory properties of CNPs under in vivo conditions .…”

“…Thus, OVD formation is crucial to fix the CNPs with active Ce 3+ sites for enhanced antioxidant properties. To control the surface chemistry of CNPs, various strategies like tuning of the size and morphology, doping, and employment of special synthesis and surface treatments have been carried out. − Among the various strategies employed to enhance the Ce 3+ active sites, doping with lower valent elements is the simplest and effective method to induce OVD. ,, …”

“…In the present work, the RE 3+ -doped CNPs were synthesized using a simple combustion method as reported by our earlier work. , The combustion method offers high-quality crystalline cerium oxide with a large amount of OVDs (Ce 3+ sites) compared to other methods because of the sudden change from the solution to the solid phase during the process. In particular, we focused on the effect of trivalent lanthanide ions such as Eu 3+ (0.106 nm), Pr 3+ (0.112 nm), Nd 3+ (0.111 nm), and La 3+ (0.116 nm), which differs from the host ionic radii (Ce 4+ : 0.097 nm, Ce 3+ : 0.114 nm) on the peroxidase, oxidase, and hydroxyl radical scavenging activities.…”

Investigation the catalytic profile of Eu and Pr doped CeO2 nanoparticles for the thermal behavior of AP

“…Further, the reduction in the crystallite size can be prophesied by the event of broadening peaks in patterns. The assessment of average crystalline size of Eu and Pr doped CeO 2 nanoparticles were evaluated by Scherrer formula [28,36,37]. The crystalline size of Eu and Pr doped CeO 2 nanoparticles is 5.02 and 4.40 nm respectively.…”

Estudo da influência dos íons terras raras Er3+, Eu3+ e Pr3+ nas propriedades fotoluminescentes e eletroquímicas do CeO2

“…Os valores obtidos a partir do refinamento Rietveld (Tabela 6) indicam que a inserção dos íons TR 3+ de maior raio iônico que o íon Ce 4+ gera distorções na rede do CeO2, uma vez que a dopagem resultou em maiores valores de parâmetros de rede e volume de célula unitária. Estas distorções podem ser provocadas tanto pela inserção de defeitos extrínsecos como vacâncias de oxigênio, quanto pela redução do íon Ce 4+ para Ce 3+ geradas a partir da inserção dos íons dopantes MUNOZ et al, 2015;SONI et al, 2018) (MANDAL et al, 2008;SANTOS, DOS et al, 2008;VINOTHKUMAR, AMALRAJ, BABU, 2017;WEBER, HASS, MCBRIDE, 1993). Embora não sejam esperados nos espectros Raman, os modos (TO) e (LO) podem ser observados quando ocorrem quebras de simetria, geralmente provocadas pela presença de vacâncias de oxigênio ou outros defeitos ocasionados pela diminuição no tamanho das partículas ou pela inserção de íons dopantes na rede cristalina do CeO2 (BALAKRISHNAN et al, 2013;GOMES, 2014;MCBRIDE et al, 1994;NAKAJIMA, YOSHIHARA, ISHIGAME, 1994;SILVA, 2015;SPANIER et al, 2001;ZAWADZKI, 2008 e Pr 3+ também apresentaram uma novas banda em torno de 527 cm -1 , 530 cm -1 e 570 cm -1 , respectivamente.…”