Violet/blue emission from epitaxial cerium oxide films on silicon substrates

Morshed, Ahmed Hisham; Moussa, M.; Bedair, S. M.; Leonard, Robert L.; Liu, S. X.; El‐Masry, N. A.

doi:10.1063/1.118658

Cited by 220 publications

(104 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The emission spectra of calcined CeO 2 NPs excited under 386 nm wavelength as shown in Fig. 15b, e. The spectra exhibits characteristic peaks at * 485, 528 and 542 nm are believed to be due to surface defects and oxygen vacancies (Li et al 2011;Arunkumar et al 2014;Morshed et al 1997;Maensiri et al 2007).…”

Section: Resultsmentioning

confidence: 99%

Fabricated CeO2 nanopowders as a novel sensing platform for advanced forensic, electrochemical and photocatalytic applications

Rohini

Nagabhushana

Darshan³

et al. 2017

Appl Nanosci

View full text Add to dashboard Cite

In Forensic investigation, identification of various types of ridge details are essential in order to fix the criminals associated in various crimes. Even though several methods and labeling agents are available to visualize latent finger prints (LFPs) there is still simple, accurate, cost-effective, and non-destructive tool is required. In the present work, CeO 2 nanopowders (NPs) are prepared via simple solution combustion route using Tamarindus indica fruit extract as a fuel. The optimized NPs are utilized for visualization of LFPs on various surfaces by powder dusting method. Results revealed that visualized LFPs exhibit Level 3 features such as pores and ridge contours under normal light with high sensitivity and without background hindrance. The photometric characteristics of the prepared samples exhibit blue color emission and highly useful in warm light emitting diodes. The photocatalytic studies were carried out with different Methylene blue (MB) dye concentration and pH values. The obtained results reveal that the CeO 2 NPs exhibits an excellent catalytic properties which can act as a good catalytic reagent. The findings demonstrate that the prepared NPs are quite useful as a labeling agent for visualization of LFPs, efficient catalysts for dye degradation as well as solid-state lighting applications.

show abstract

Section: Resultsmentioning

confidence: 99%

Fabricated CeO2 nanopowders as a novel sensing platform for advanced forensic, electrochemical and photocatalytic applications

Rohini

Nagabhushana

Darshan³

et al. 2017

Appl Nanosci

View full text Add to dashboard Cite

show abstract

“…The violet emission band centered at 412 nm for CeO 2 NPs is attributed to defect states existing extensively between the Ce 4f state and O 2p valence band 25 . The two blue emissions are observed at 444 nm and 460 nm for CeO 2 NPs and this is due to localization of the energy levels between the Ce 4f band and the O 2p band.…”

Section: Ftir Analysismentioning

confidence: 99%

Synthesis and Characterization of Various Metal Ions Doped CeO2 Nanoparticles Derived from the Azadirachta Indica Leaf Extracts

2017

Chem Sci Trans

View full text Add to dashboard Cite

Abstract:The cerium oxide nanoparticles (CeO 2 NPs) and M 2+ doped CeO 2 NPs (M 2+ = Zn 2+ , Ni 2+ , Cu 2+ and Co 2+ ) were prepared through the Azadirachta indica (A. indica) leaf extracts. The x-ray diffraction studies confirmed that synthesized pure and M 2+ doped CeO 2 NPs were exhibited the cubic structure. The FESEM and TEM images of both pure and M 2+ doped CeO 2 NPs have exhibited spherical structure. From the EDAX spectral analysis, the elemental compositions were identified. The various functional groups were confirmed by FT-IR spectrum. Photoluminescence spectral analysis, small shift observed for emission of the CeO 2 NPs values as compared to that of the transition metal ions doped CeO 2 NPs emission values. The antimicrobial studies were performed against a set of gram positive (Staphylococcus aureus and Streptococcus pneumoniae) and gram negative (Escherichia coli, Pseudomonas aeruginosa, Proteus vulgaris, Klebsiella pneumonia and Shigelladysenteriae) bacterial and fungal candida albicans strain.

show abstract

“…[38À41] Morshed et al [41] observed a wide PL emission band from 325 to 550 nm in CeO 2 nanoparticles. The emission peaks have been attributed to (1) oxygen deficient ceria Ce 6 O 11 , (2) charge transitions from the 4f band to the valence band of the CeO 2 , (3) surface defects, (4) defects in energy levels between Ce 4C (4f) and O 2¡ (2p) level resulting in hopping of electrons.…”

Section: Photoluminescence (Pl) Studiesmentioning

confidence: 99%

Absorption and emission properties of Zr-doped nanoceria synthesised by co-precipitation-hydrothermal treatment route

Sahoo

Mohapatra

Anand

2014

Journal of Experimental Nanoscience

View full text Add to dashboard Cite

A series of nanoceria samples doped with zirconium (nil to 2 mol%) and a typical sample doped with 1 mol% each of Zr and Eu were synthesised following coprecipitation-hydrothermal treatment route. The main peaks in X-ray diffraction (XRD) patterns of all the samples corresponded to (111), (200), (220) and (311) planes of cubic ceria. The Fourier transform infrared spectra showed bands which were indicative of formation of nanoceria with intercalated/adsorbed water. In Raman spectra, a sharp and intense Raman shift at around 460À462 cm ¡1 was observed for all the samples and the peak intensity decreased with increase in mol% doping of Zr. In case of ZrÀEu-doped sample the peak intensity was similar to the undoped ceria. The decrease in intensity could be due to accumulation/precipitation of more numbers of Zr ions on the surface rather than incorporation into ceria lattice. The indirect band gaps estimated from ultravioletÀvisible absorption spectra were smaller when compared to the direct ones. The smaller indirect band gaps indicate that Zr-doped nanoparticles with a higher fraction of atoms residing at the surface were available to assist the indirect electron transition from the valence band to the conduction band. Emission spectra obtained by exciting at 300 and 500 nm for all samples are discussed in details. Transmission electron microscope image of a typical sample showed mono-dispersed uniform sized single crystalline doped ceria.

show abstract

Violet/blue emission from epitaxial cerium oxide films on silicon substrates

Cited by 220 publications

References 11 publications

Fabricated CeO2 nanopowders as a novel sensing platform for advanced forensic, electrochemical and photocatalytic applications

Fabricated CeO2 nanopowders as a novel sensing platform for advanced forensic, electrochemical and photocatalytic applications

Synthesis and Characterization of Various Metal Ions Doped CeO2 Nanoparticles Derived from the Azadirachta Indica Leaf Extracts

Absorption and emission properties of Zr-doped nanoceria synthesised by co-precipitation-hydrothermal treatment route

Contact Info

Product

Resources

About