Strong quantum confinement effect in nanocrystalline cerium oxide

Arul, N. Sabari; Mangalaraj, D.; Chen, Pao Chi; Ponpandian, N.; Viswanathan, C.

doi:10.1016/j.matlet.2011.05.022

Cited by 54 publications

(24 citation statements)

References 19 publications

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“…Form all above absorption data, the band gap energy ( E g ) of pure CeO 2 and Ce 1− x Gd x O 2 ( x = 0.02, 0.04, 0.06, 0.08, and 0.10) NPs has been calculated using Tauc's equation

α h ν = A {(h ν - E_{g})}^{n}

where all the parameters have their usual meaning. For direct transition n = 1/2 and for n = 2 for indirect transition . Figure b displays the measured values of ( αhν ) 2 as a function of the incident photon energy ( hν ).…”

Section: Resultsmentioning

confidence: 99%

Electronic Structure and Room Temperature Ferromagnetism in Gd‐doped Cerium Oxide Nanoparticles for Hydrogen Generation via Photocatalytic Water Splitting

et al. 2019

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Enhanced visible light photocatalytic activity of Gd‐doped CeO 2 nanoparticles (NPs) is experimentally demonstrated, whereas there are very few reports on this mechanism with rare earth doping. All‐pure and Gd‐doped CeO 2 NPs are synthesized using a coprecipitation method and characterized using X‐ray diffraction (XRD), absorption spectroscopy, surface‐enhanced Raman Spectroscopy (SERS), X‐ray photoelectron spectroscopy (XPS), and superconducting quantum interference device (SQUID). The effect of Gd‐doping on properties of CeO 2 is discussed along with defects and oxygen vacancies generation. The XRD confirms the incorporation of Gd 3+ at the Ce 3+ /Ce 4+ site by keeping the crystal structure same. The average particle size from transmission electron microscopy (TEM) images is in the range of 5–7 nm. The XPS spectra of Ce 3d, O 1s, and Gd 4d exhibits the formation of oxygen vacancies to maintain the charge neutrality when Ce 4+ changes to Ce 3+ . The gradual increase in hydrogen production is observed with increasing Gd concentration. The observed results are in good correlation with the characterization results and a mechanism of water splitting is proposed on the basis of analyses. The absorption spectra reveal optical band gap (2.5–2.7 eV) of samples, showing band gap narrowing leads to desired optical absorbance and photoactivity of NPs.

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“…Form all above absorption data, the band gap energy ( E g ) of pure CeO 2 and Ce 1− x Gd x O 2 ( x = 0.02, 0.04, 0.06, 0.08, and 0.10) NPs has been calculated using Tauc's equation

α h ν = A {(h ν - E_{g})}^{n}

Section: Resultsmentioning

confidence: 99%

Electronic Structure and Room Temperature Ferromagnetism in Gd‐doped Cerium Oxide Nanoparticles for Hydrogen Generation via Photocatalytic Water Splitting

et al. 2019

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“…The diffraction peaks at 28°, 33°, and 56° could be assigned to the diffractions of the (111), (200), and (311) planes of CeO 2 (JCPDS No. 340394) (Arul et al 2011), respectively. The absence of other peaks indicate the purity of the coating.…”

Section: Resultsmentioning

confidence: 99%

“…Obviously, the superhydrophobic wood has a much higher absorption in the region around 300 nm than the original wood, i.e., the damaging high energy UV rays are more efficiently eliminated by the coating. It is also possible that the CeO 2 nanoparticles act as efficient UV scattering agents because of the large refractive index of CeO 2 nanoparticles (Arul et al 2011;Tsoncheva et al 2013). …”

Section: Resultsmentioning

confidence: 99%

Improved weathering performance and wettability of wood protected by CeO₂ coating deposited onto the surface

Xiao

Gao

et al. 2013

Holzforschung

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Wood in outdoor exposure undergoes photo chemical degradation mainly caused by the combination of UV radiation and moisture, thus appropriate coatings are desirable. In this paper, the wood surface was first treated with CeO 2 sol and then treated with a layer of octa decyltrichlorosilane (OTS) and the created coating was characterized by field emission scanning electron micro scopy (FESEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDXA), Xray diffraction (XRD), and FTIR spectroscopy (FTIR). The surface became superhydrophobic as the contact angle (CA) for water of the modified wood was 152°. Accelerated aging tests revealed that the modified wood has an excellent weath ering resistance.

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“…If the surfactant coating is present after drying of the particles, it can also reduce the aggregation during calcinations steps, leading to very small, disperse particles after heat treatment at up to 800°C. 147 On the contrary, even a combined application of peptizing surfactants and ultrasonic agitation after the precursor 130 Ce 2 (CO 3 ) 3 P/C 400-1000 20-50 J.-G. Li et al 123 Ce(NO 3 ) 3 P/C 300-1000 5-65 Arul et al 131 Ce(NH 4 ) 2 (NO 3 ) 6 P/C 600 5 Hassanzade-Tabrizi et al 124 CeCl 3 P/C 100-900 10-50 Suresh et al 128 Ce(NO 3 ) 3 P/C 450-900 10-50 Mohamed et al 132 Ce(NO 3 ) 3 MW 160/500 8-15 Liao et al 133 Ce(NH 4 ) 2 (NO 3 ) 6 MW $100 2 Chen and Chang 134 Ce(NO 3 ) 3 Sol 30-90 7-20 Li et al 125 CeCl 3 Sol 40 2-4 135 Shuk, Greenblatt et al [136][137][138][139][140][141][142] Ce(NO 3 ) 3 HT 260 10-50 Hirano et al 143 Ce(NH 4 ) 2 (NO 3 ) 6 HT 150-240 3-9 Hakuta et al 126 Ce(NO 3 ) 3 HT 250-400 20-250 Yin et al 144 Ce(NH 4 ) 2 (NO 3 ) 6 Sono 80 3-7 Yu et al 145 Ce(NH 4 ) 2 (NO 3 ) 6 Sono 80 3-7 Masui et al 146 Ce(NO 3 ) 3 ME RT 2-5 Feng et al 147 Ce(NO 3 ) 3 ME RT/800 25-50…”

Section: Water-based Chemical Methodsmentioning

confidence: 99%

Nanoparticulate inorganic UV absorbers: a review

2015

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Inorganic nanoparticles with UV-absorbing properties are an important class of UV filters. They can be used in various applications and in a variety of forms, including suspensions, nanocomposites, and solid thin films. In this review, an overview of the synthetic methods and their respective products is given for the most popular UV-absorbing nanomaterials, including zinc oxide, titanium dioxide, cerium dioxide and ferrous oxides, and oxyhydroxides.

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Strong quantum confinement effect in nanocrystalline cerium oxide

Cited by 54 publications

References 19 publications

Electronic Structure and Room Temperature Ferromagnetism in Gd‐doped Cerium Oxide Nanoparticles for Hydrogen Generation via Photocatalytic Water Splitting

Electronic Structure and Room Temperature Ferromagnetism in Gd‐doped Cerium Oxide Nanoparticles for Hydrogen Generation via Photocatalytic Water Splitting

Improved weathering performance and wettability of wood protected by CeO₂ coating deposited onto the surface

Nanoparticulate inorganic UV absorbers: a review

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Strong quantum confinement effect in nanocrystalline cerium oxide

Cited by 54 publications

References 19 publications

Electronic Structure and Room Temperature Ferromagnetism in Gd‐doped Cerium Oxide Nanoparticles for Hydrogen Generation via Photocatalytic Water Splitting

Electronic Structure and Room Temperature Ferromagnetism in Gd‐doped Cerium Oxide Nanoparticles for Hydrogen Generation via Photocatalytic Water Splitting

Improved weathering performance and wettability of wood protected by CeO2 coating deposited onto the surface

Nanoparticulate inorganic UV absorbers: a review

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Improved weathering performance and wettability of wood protected by CeO₂ coating deposited onto the surface