Photocatalytic characteristics for the nanocrystalline TiO                         2                          on the Ag-doped CaAl                         2                         O                         4                         :(Eu,Nd) phosphor

Jung Sik Kim; Hyun Je Sung; Bum Joon Kim

doi:10.1016/j.apsusc.2014.08.169

Photocatalytic characteristics for the nanocrystalline TiO ₂ on the Ag-doped CaAl ₂ O ₄ :(Eu,Nd) phosphor

Jung Sik Kim, Hyun Je Sung, Bum Joon Kim

Department of Materials Science and Engineering

University of Seoul

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

This study investigated the photocatalytic behavior of nanocrystalline TiO ₂ deposited on Ag-doped long-lasting phosphor (CaAl ₂ O ₄ :Eu ²⁺ ,Nd ³⁺ ). The CaAl ₂ O ₄ :Eu ²⁺ ,Nd ³⁺ phosphor powders were prepared via conventional sintering using CaCO ₃ , Al ₂ O ₃ , Eu ₂ O ₃ , and Nd ₂ O ₃ as raw materials according to the appropriate molar ratios. Silver nanoparticles were loaded on the phosphor by mixing with an aqueous Ag-dispersion solution. Nanocrystalline TiO ₂ was deposited on Ag-doped CaAl ₂ O ₄ :Eu ²⁺ ,Nd ³⁺ powders via low-pressure chemical vapor deposition (LPCVD). The TiO ₂ coated on the phosphor was actively photo-reactive under irradiation with visible light and showed much faster benzene degradation than pure TiO ₂ , which is almost non-reactive. The coupling of TiO ₂ with phosphor may result in an energy band bending in the junction region, which then induces the TiO ₂ crystal at the interface to be photo-reactive under irradiation with visible light. In addition, the intermetallic compound of CaTiO ₃ that formed at the interface between TiO ₂ and the CaAl ₂ O ₄ :(Eu ²⁺ ,Nd ³⁺ ) phosphor results in the formation of oxygen vacancies and additional electrons that promote the photodecomposition of benzene gas. The addition of Ag nanoparticles enhanced the photocatalytic reactivity of the TiO ₂ /CaAl ₂ O ₄ :Eu ²⁺ ,Nd ³⁺ phosphor. TiO ₂ on the Ag-doped phosphor presented a higher benzene gas decomposition rate than the TiO ₂ did on the phosphor without Ag-doping under both irradiation with ultraviolet and visible light.

Original language	English
Pages (from-to)	151-156
Number of pages	6
Journal	Applied Surface Science
Volume	334
DOIs	https://doi.org/10.1016/j.apsusc.2014.08.169
State	Published - 15 Apr 2015

Keywords

Ag-doping
CaAl O :Eu ,Nd
Long-lasting phosphor
Photocatalyst
TiO

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10.1016/j.apsusc.2014.08.169

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Kim, J. S., Sung, H. J., & Kim, B. J. (2015). Photocatalytic characteristics for the nanocrystalline TiO ₂ on the Ag-doped CaAl ₂ O ₄ :(Eu,Nd) phosphor Applied Surface Science, 334, 151-156. https://doi.org/10.1016/j.apsusc.2014.08.169

Kim, Jung Sik ; Sung, Hyun Je ; Kim, Bum Joon. / Photocatalytic characteristics for the nanocrystalline TiO ₂ on the Ag-doped CaAl ₂ O ₄ :(Eu,Nd) phosphor In: Applied Surface Science. 2015 ; Vol. 334. pp. 151-156.

@article{2c7ce70ccadc4a309085c5a888763c7a,

title = " Photocatalytic characteristics for the nanocrystalline TiO 2 on the Ag-doped CaAl 2 O 4 :(Eu,Nd) phosphor ",

abstract = " This study investigated the photocatalytic behavior of nanocrystalline TiO 2 deposited on Ag-doped long-lasting phosphor (CaAl 2 O 4 :Eu 2+ ,Nd 3+ ). The CaAl 2 O 4 :Eu 2+ ,Nd 3+ phosphor powders were prepared via conventional sintering using CaCO 3 , Al 2 O 3 , Eu 2 O 3 , and Nd 2 O 3 as raw materials according to the appropriate molar ratios. Silver nanoparticles were loaded on the phosphor by mixing with an aqueous Ag-dispersion solution. Nanocrystalline TiO 2 was deposited on Ag-doped CaAl 2 O 4 :Eu 2+ ,Nd 3+ powders via low-pressure chemical vapor deposition (LPCVD). The TiO 2 coated on the phosphor was actively photo-reactive under irradiation with visible light and showed much faster benzene degradation than pure TiO 2 , which is almost non-reactive. The coupling of TiO 2 with phosphor may result in an energy band bending in the junction region, which then induces the TiO 2 crystal at the interface to be photo-reactive under irradiation with visible light. In addition, the intermetallic compound of CaTiO 3 that formed at the interface between TiO 2 and the CaAl 2 O 4 :(Eu 2+ ,Nd 3+ ) phosphor results in the formation of oxygen vacancies and additional electrons that promote the photodecomposition of benzene gas. The addition of Ag nanoparticles enhanced the photocatalytic reactivity of the TiO 2 /CaAl 2 O 4 :Eu 2+ ,Nd 3+ phosphor. TiO 2 on the Ag-doped phosphor presented a higher benzene gas decomposition rate than the TiO 2 did on the phosphor without Ag-doping under both irradiation with ultraviolet and visible light.",

keywords = "Ag-doping, CaAl O :Eu ,Nd, Long-lasting phosphor, Photocatalyst, TiO",

author = "Kim, {Jung Sik} and Sung, {Hyun Je} and Kim, {Bum Joon}",

year = "2015",

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day = "15",

doi = "10.1016/j.apsusc.2014.08.169",

language = "English",

volume = "334",

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journal = "Applied Surface Science",

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Kim, JS, Sung, HJ & Kim, BJ 2015, ' Photocatalytic characteristics for the nanocrystalline TiO ₂ on the Ag-doped CaAl ₂ O ₄ :(Eu,Nd) phosphor ', Applied Surface Science, vol. 334, pp. 151-156. https://doi.org/10.1016/j.apsusc.2014.08.169

Photocatalytic characteristics for the nanocrystalline TiO ₂ on the Ag-doped CaAl ₂ O ₄ :(Eu,Nd) phosphor . / Kim, Jung Sik; Sung, Hyun Je; Kim, Bum Joon.
In: Applied Surface Science, Vol. 334, 15.04.2015, p. 151-156.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Photocatalytic characteristics for the nanocrystalline TiO 2 on the Ag-doped CaAl 2 O 4 :(Eu,Nd) phosphor

AU - Kim, Jung Sik

AU - Sung, Hyun Je

AU - Kim, Bum Joon

PY - 2015/4/15

Y1 - 2015/4/15

N2 - This study investigated the photocatalytic behavior of nanocrystalline TiO 2 deposited on Ag-doped long-lasting phosphor (CaAl 2 O 4 :Eu 2+ ,Nd 3+ ). The CaAl 2 O 4 :Eu 2+ ,Nd 3+ phosphor powders were prepared via conventional sintering using CaCO 3 , Al 2 O 3 , Eu 2 O 3 , and Nd 2 O 3 as raw materials according to the appropriate molar ratios. Silver nanoparticles were loaded on the phosphor by mixing with an aqueous Ag-dispersion solution. Nanocrystalline TiO 2 was deposited on Ag-doped CaAl 2 O 4 :Eu 2+ ,Nd 3+ powders via low-pressure chemical vapor deposition (LPCVD). The TiO 2 coated on the phosphor was actively photo-reactive under irradiation with visible light and showed much faster benzene degradation than pure TiO 2 , which is almost non-reactive. The coupling of TiO 2 with phosphor may result in an energy band bending in the junction region, which then induces the TiO 2 crystal at the interface to be photo-reactive under irradiation with visible light. In addition, the intermetallic compound of CaTiO 3 that formed at the interface between TiO 2 and the CaAl 2 O 4 :(Eu 2+ ,Nd 3+ ) phosphor results in the formation of oxygen vacancies and additional electrons that promote the photodecomposition of benzene gas. The addition of Ag nanoparticles enhanced the photocatalytic reactivity of the TiO 2 /CaAl 2 O 4 :Eu 2+ ,Nd 3+ phosphor. TiO 2 on the Ag-doped phosphor presented a higher benzene gas decomposition rate than the TiO 2 did on the phosphor without Ag-doping under both irradiation with ultraviolet and visible light.

AB - This study investigated the photocatalytic behavior of nanocrystalline TiO 2 deposited on Ag-doped long-lasting phosphor (CaAl 2 O 4 :Eu 2+ ,Nd 3+ ). The CaAl 2 O 4 :Eu 2+ ,Nd 3+ phosphor powders were prepared via conventional sintering using CaCO 3 , Al 2 O 3 , Eu 2 O 3 , and Nd 2 O 3 as raw materials according to the appropriate molar ratios. Silver nanoparticles were loaded on the phosphor by mixing with an aqueous Ag-dispersion solution. Nanocrystalline TiO 2 was deposited on Ag-doped CaAl 2 O 4 :Eu 2+ ,Nd 3+ powders via low-pressure chemical vapor deposition (LPCVD). The TiO 2 coated on the phosphor was actively photo-reactive under irradiation with visible light and showed much faster benzene degradation than pure TiO 2 , which is almost non-reactive. The coupling of TiO 2 with phosphor may result in an energy band bending in the junction region, which then induces the TiO 2 crystal at the interface to be photo-reactive under irradiation with visible light. In addition, the intermetallic compound of CaTiO 3 that formed at the interface between TiO 2 and the CaAl 2 O 4 :(Eu 2+ ,Nd 3+ ) phosphor results in the formation of oxygen vacancies and additional electrons that promote the photodecomposition of benzene gas. The addition of Ag nanoparticles enhanced the photocatalytic reactivity of the TiO 2 /CaAl 2 O 4 :Eu 2+ ,Nd 3+ phosphor. TiO 2 on the Ag-doped phosphor presented a higher benzene gas decomposition rate than the TiO 2 did on the phosphor without Ag-doping under both irradiation with ultraviolet and visible light.

KW - Ag-doping

KW - CaAl O :Eu ,Nd

KW - Long-lasting phosphor

KW - Photocatalyst

KW - TiO

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DO - 10.1016/j.apsusc.2014.08.169

M3 - Article

AN - SCOPUS:84925455808

SN - 0169-4332

VL - 334

SP - 151

EP - 156

JO - Applied Surface Science

JF - Applied Surface Science

ER -

Kim JS, Sung HJ, Kim BJ. Photocatalytic characteristics for the nanocrystalline TiO ₂ on the Ag-doped CaAl ₂ O ₄ :(Eu,Nd) phosphor Applied Surface Science. 2015 Apr 15;334:151-156. doi: 10.1016/j.apsusc.2014.08.169

Photocatalytic characteristics for the nanocrystalline TiO ₂ on the Ag-doped CaAl ₂ O ₄ :(Eu,Nd) phosphor

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Keywords

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