Impurity doping approach on bandgap narrowing and improved photocatalysis of Ca
To modify the band natures and photochemical properties of Ca2Bi2O5, partial substitutions of La3+-, Na+-, Te4+-ions on Bi-sites were respectively conducted. The phase formations were investigated via XRD Rietveld refinements. High spontaneous polarization can be induced by the special geometry of B...
Ausführliche Beschreibung
Autor*in: |
Ji, Xiaohui [verfasserIn] Lu, Jiu-Fu [verfasserIn] Wang, Qin [verfasserIn] Zhang, Dan [verfasserIn] |
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Format: |
E-Artikel |
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Sprache: |
Englisch |
Erschienen: |
2020 |
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Schlagwörter: |
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Übergeordnetes Werk: |
Enthalten in: Powder technology - Amsterdam [u.a.] : Elsevier Science, 1967, 376, Seite 708-723 |
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Übergeordnetes Werk: |
volume:376 ; pages:708-723 |
DOI / URN: |
10.1016/j.powtec.2020.08.029 |
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Katalog-ID: |
ELV004858670 |
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520 | |a To modify the band natures and photochemical properties of Ca2Bi2O5, partial substitutions of La3+-, Na+-, Te4+-ions on Bi-sites were respectively conducted. The phase formations were investigated via XRD Rietveld refinements. High spontaneous polarization can be induced by the special geometry of BiO polyhedra with see-saw -like arrangement. Ca2Bi2O5 has a band energy of 2.49 eV (498 nm) with a direct allowed transition nature. La3+-, Na+-, Te4+-substitution can modify UV–vis absorption via the band-gap narrowing and the induced defects. Especially, the band energy of Te4+-doped Ca2Bi2O5 was reduced to 2.29 eV (541 nm) indicating a significant harvest of visible-light. The photocatalysis was evaluated on MB photodegradation. The impurity substitution can improve photocatalysis of Ca2Bi2O5. XPS, emission, and decay times were applied to discuss the mechanism. La3+-, Na+-, Te4+-doping in Ca2Bi2O5 can depress the recombination of light-induced charges via prolonging the decay times. The results could be referred to investigate multifunctional optical applications of bismuth semiconductors. | ||
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650 | 4 | |a Optical properties | |
700 | 1 | |a Lu, Jiu-Fu |e verfasserin |4 aut | |
700 | 1 | |a Wang, Qin |e verfasserin |4 aut | |
700 | 1 | |a Zhang, Dan |e verfasserin |4 aut | |
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10.1016/j.powtec.2020.08.029 doi (DE-627)ELV004858670 (ELSEVIER)S0032-5910(20)30777-4 DE-627 ger DE-627 rda eng 660 DE-600 58.10 bkl 52.77 bkl Ji, Xiaohui verfasserin aut Impurity doping approach on bandgap narrowing and improved photocatalysis of Ca 2020 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier To modify the band natures and photochemical properties of Ca2Bi2O5, partial substitutions of La3+-, Na+-, Te4+-ions on Bi-sites were respectively conducted. The phase formations were investigated via XRD Rietveld refinements. High spontaneous polarization can be induced by the special geometry of BiO polyhedra with see-saw -like arrangement. Ca2Bi2O5 has a band energy of 2.49 eV (498 nm) with a direct allowed transition nature. La3+-, Na+-, Te4+-substitution can modify UV–vis absorption via the band-gap narrowing and the induced defects. Especially, the band energy of Te4+-doped Ca2Bi2O5 was reduced to 2.29 eV (541 nm) indicating a significant harvest of visible-light. The photocatalysis was evaluated on MB photodegradation. The impurity substitution can improve photocatalysis of Ca2Bi2O5. XPS, emission, and decay times were applied to discuss the mechanism. La3+-, Na+-, Te4+-doping in Ca2Bi2O5 can depress the recombination of light-induced charges via prolonging the decay times. The results could be referred to investigate multifunctional optical applications of bismuth semiconductors. Bismuth Semiconductor Photocatalysis Heterovalent substitution Band structure Optical properties Lu, Jiu-Fu verfasserin aut Wang, Qin verfasserin aut Zhang, Dan verfasserin aut Enthalten in Powder technology Amsterdam [u.a.] : Elsevier Science, 1967 376, Seite 708-723 Online-Ressource (DE-627)320599019 (DE-600)2019938-7 (DE-576)098474278 0032-5910 nnns volume:376 pages:708-723 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 58.10 Verfahrenstechnik: Allgemeines 52.77 Urformen AR 376 708-723 |
spelling |
10.1016/j.powtec.2020.08.029 doi (DE-627)ELV004858670 (ELSEVIER)S0032-5910(20)30777-4 DE-627 ger DE-627 rda eng 660 DE-600 58.10 bkl 52.77 bkl Ji, Xiaohui verfasserin aut Impurity doping approach on bandgap narrowing and improved photocatalysis of Ca 2020 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier To modify the band natures and photochemical properties of Ca2Bi2O5, partial substitutions of La3+-, Na+-, Te4+-ions on Bi-sites were respectively conducted. The phase formations were investigated via XRD Rietveld refinements. High spontaneous polarization can be induced by the special geometry of BiO polyhedra with see-saw -like arrangement. Ca2Bi2O5 has a band energy of 2.49 eV (498 nm) with a direct allowed transition nature. La3+-, Na+-, Te4+-substitution can modify UV–vis absorption via the band-gap narrowing and the induced defects. Especially, the band energy of Te4+-doped Ca2Bi2O5 was reduced to 2.29 eV (541 nm) indicating a significant harvest of visible-light. The photocatalysis was evaluated on MB photodegradation. The impurity substitution can improve photocatalysis of Ca2Bi2O5. XPS, emission, and decay times were applied to discuss the mechanism. La3+-, Na+-, Te4+-doping in Ca2Bi2O5 can depress the recombination of light-induced charges via prolonging the decay times. The results could be referred to investigate multifunctional optical applications of bismuth semiconductors. Bismuth Semiconductor Photocatalysis Heterovalent substitution Band structure Optical properties Lu, Jiu-Fu verfasserin aut Wang, Qin verfasserin aut Zhang, Dan verfasserin aut Enthalten in Powder technology Amsterdam [u.a.] : Elsevier Science, 1967 376, Seite 708-723 Online-Ressource (DE-627)320599019 (DE-600)2019938-7 (DE-576)098474278 0032-5910 nnns volume:376 pages:708-723 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 58.10 Verfahrenstechnik: Allgemeines 52.77 Urformen AR 376 708-723 |
allfields_unstemmed |
10.1016/j.powtec.2020.08.029 doi (DE-627)ELV004858670 (ELSEVIER)S0032-5910(20)30777-4 DE-627 ger DE-627 rda eng 660 DE-600 58.10 bkl 52.77 bkl Ji, Xiaohui verfasserin aut Impurity doping approach on bandgap narrowing and improved photocatalysis of Ca 2020 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier To modify the band natures and photochemical properties of Ca2Bi2O5, partial substitutions of La3+-, Na+-, Te4+-ions on Bi-sites were respectively conducted. The phase formations were investigated via XRD Rietveld refinements. High spontaneous polarization can be induced by the special geometry of BiO polyhedra with see-saw -like arrangement. Ca2Bi2O5 has a band energy of 2.49 eV (498 nm) with a direct allowed transition nature. La3+-, Na+-, Te4+-substitution can modify UV–vis absorption via the band-gap narrowing and the induced defects. Especially, the band energy of Te4+-doped Ca2Bi2O5 was reduced to 2.29 eV (541 nm) indicating a significant harvest of visible-light. The photocatalysis was evaluated on MB photodegradation. The impurity substitution can improve photocatalysis of Ca2Bi2O5. XPS, emission, and decay times were applied to discuss the mechanism. La3+-, Na+-, Te4+-doping in Ca2Bi2O5 can depress the recombination of light-induced charges via prolonging the decay times. The results could be referred to investigate multifunctional optical applications of bismuth semiconductors. Bismuth Semiconductor Photocatalysis Heterovalent substitution Band structure Optical properties Lu, Jiu-Fu verfasserin aut Wang, Qin verfasserin aut Zhang, Dan verfasserin aut Enthalten in Powder technology Amsterdam [u.a.] : Elsevier Science, 1967 376, Seite 708-723 Online-Ressource (DE-627)320599019 (DE-600)2019938-7 (DE-576)098474278 0032-5910 nnns volume:376 pages:708-723 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 58.10 Verfahrenstechnik: Allgemeines 52.77 Urformen AR 376 708-723 |
allfieldsGer |
10.1016/j.powtec.2020.08.029 doi (DE-627)ELV004858670 (ELSEVIER)S0032-5910(20)30777-4 DE-627 ger DE-627 rda eng 660 DE-600 58.10 bkl 52.77 bkl Ji, Xiaohui verfasserin aut Impurity doping approach on bandgap narrowing and improved photocatalysis of Ca 2020 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier To modify the band natures and photochemical properties of Ca2Bi2O5, partial substitutions of La3+-, Na+-, Te4+-ions on Bi-sites were respectively conducted. The phase formations were investigated via XRD Rietveld refinements. High spontaneous polarization can be induced by the special geometry of BiO polyhedra with see-saw -like arrangement. Ca2Bi2O5 has a band energy of 2.49 eV (498 nm) with a direct allowed transition nature. La3+-, Na+-, Te4+-substitution can modify UV–vis absorption via the band-gap narrowing and the induced defects. Especially, the band energy of Te4+-doped Ca2Bi2O5 was reduced to 2.29 eV (541 nm) indicating a significant harvest of visible-light. The photocatalysis was evaluated on MB photodegradation. The impurity substitution can improve photocatalysis of Ca2Bi2O5. XPS, emission, and decay times were applied to discuss the mechanism. La3+-, Na+-, Te4+-doping in Ca2Bi2O5 can depress the recombination of light-induced charges via prolonging the decay times. The results could be referred to investigate multifunctional optical applications of bismuth semiconductors. Bismuth Semiconductor Photocatalysis Heterovalent substitution Band structure Optical properties Lu, Jiu-Fu verfasserin aut Wang, Qin verfasserin aut Zhang, Dan verfasserin aut Enthalten in Powder technology Amsterdam [u.a.] : Elsevier Science, 1967 376, Seite 708-723 Online-Ressource (DE-627)320599019 (DE-600)2019938-7 (DE-576)098474278 0032-5910 nnns volume:376 pages:708-723 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 58.10 Verfahrenstechnik: Allgemeines 52.77 Urformen AR 376 708-723 |
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10.1016/j.powtec.2020.08.029 doi (DE-627)ELV004858670 (ELSEVIER)S0032-5910(20)30777-4 DE-627 ger DE-627 rda eng 660 DE-600 58.10 bkl 52.77 bkl Ji, Xiaohui verfasserin aut Impurity doping approach on bandgap narrowing and improved photocatalysis of Ca 2020 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier To modify the band natures and photochemical properties of Ca2Bi2O5, partial substitutions of La3+-, Na+-, Te4+-ions on Bi-sites were respectively conducted. The phase formations were investigated via XRD Rietveld refinements. High spontaneous polarization can be induced by the special geometry of BiO polyhedra with see-saw -like arrangement. Ca2Bi2O5 has a band energy of 2.49 eV (498 nm) with a direct allowed transition nature. La3+-, Na+-, Te4+-substitution can modify UV–vis absorption via the band-gap narrowing and the induced defects. Especially, the band energy of Te4+-doped Ca2Bi2O5 was reduced to 2.29 eV (541 nm) indicating a significant harvest of visible-light. The photocatalysis was evaluated on MB photodegradation. The impurity substitution can improve photocatalysis of Ca2Bi2O5. XPS, emission, and decay times were applied to discuss the mechanism. La3+-, Na+-, Te4+-doping in Ca2Bi2O5 can depress the recombination of light-induced charges via prolonging the decay times. The results could be referred to investigate multifunctional optical applications of bismuth semiconductors. Bismuth Semiconductor Photocatalysis Heterovalent substitution Band structure Optical properties Lu, Jiu-Fu verfasserin aut Wang, Qin verfasserin aut Zhang, Dan verfasserin aut Enthalten in Powder technology Amsterdam [u.a.] : Elsevier Science, 1967 376, Seite 708-723 Online-Ressource (DE-627)320599019 (DE-600)2019938-7 (DE-576)098474278 0032-5910 nnns volume:376 pages:708-723 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4336 GBV_ILN_4338 GBV_ILN_4393 58.10 Verfahrenstechnik: Allgemeines 52.77 Urformen AR 376 708-723 |
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title |
Impurity doping approach on bandgap narrowing and improved photocatalysis of Ca |
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Impurity doping approach on bandgap narrowing and improved photocatalysis of Ca |
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Ji, Xiaohui |
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Ji, Xiaohui Lu, Jiu-Fu Wang, Qin Zhang, Dan |
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Ji, Xiaohui |
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10.1016/j.powtec.2020.08.029 |
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impurity doping approach on bandgap narrowing and improved photocatalysis of ca |
title_auth |
Impurity doping approach on bandgap narrowing and improved photocatalysis of Ca |
abstract |
To modify the band natures and photochemical properties of Ca2Bi2O5, partial substitutions of La3+-, Na+-, Te4+-ions on Bi-sites were respectively conducted. The phase formations were investigated via XRD Rietveld refinements. High spontaneous polarization can be induced by the special geometry of BiO polyhedra with see-saw -like arrangement. Ca2Bi2O5 has a band energy of 2.49 eV (498 nm) with a direct allowed transition nature. La3+-, Na+-, Te4+-substitution can modify UV–vis absorption via the band-gap narrowing and the induced defects. Especially, the band energy of Te4+-doped Ca2Bi2O5 was reduced to 2.29 eV (541 nm) indicating a significant harvest of visible-light. The photocatalysis was evaluated on MB photodegradation. The impurity substitution can improve photocatalysis of Ca2Bi2O5. XPS, emission, and decay times were applied to discuss the mechanism. La3+-, Na+-, Te4+-doping in Ca2Bi2O5 can depress the recombination of light-induced charges via prolonging the decay times. The results could be referred to investigate multifunctional optical applications of bismuth semiconductors. |
abstractGer |
To modify the band natures and photochemical properties of Ca2Bi2O5, partial substitutions of La3+-, Na+-, Te4+-ions on Bi-sites were respectively conducted. The phase formations were investigated via XRD Rietveld refinements. High spontaneous polarization can be induced by the special geometry of BiO polyhedra with see-saw -like arrangement. Ca2Bi2O5 has a band energy of 2.49 eV (498 nm) with a direct allowed transition nature. La3+-, Na+-, Te4+-substitution can modify UV–vis absorption via the band-gap narrowing and the induced defects. Especially, the band energy of Te4+-doped Ca2Bi2O5 was reduced to 2.29 eV (541 nm) indicating a significant harvest of visible-light. The photocatalysis was evaluated on MB photodegradation. The impurity substitution can improve photocatalysis of Ca2Bi2O5. XPS, emission, and decay times were applied to discuss the mechanism. La3+-, Na+-, Te4+-doping in Ca2Bi2O5 can depress the recombination of light-induced charges via prolonging the decay times. The results could be referred to investigate multifunctional optical applications of bismuth semiconductors. |
abstract_unstemmed |
To modify the band natures and photochemical properties of Ca2Bi2O5, partial substitutions of La3+-, Na+-, Te4+-ions on Bi-sites were respectively conducted. The phase formations were investigated via XRD Rietveld refinements. High spontaneous polarization can be induced by the special geometry of BiO polyhedra with see-saw -like arrangement. Ca2Bi2O5 has a band energy of 2.49 eV (498 nm) with a direct allowed transition nature. La3+-, Na+-, Te4+-substitution can modify UV–vis absorption via the band-gap narrowing and the induced defects. Especially, the band energy of Te4+-doped Ca2Bi2O5 was reduced to 2.29 eV (541 nm) indicating a significant harvest of visible-light. The photocatalysis was evaluated on MB photodegradation. The impurity substitution can improve photocatalysis of Ca2Bi2O5. XPS, emission, and decay times were applied to discuss the mechanism. La3+-, Na+-, Te4+-doping in Ca2Bi2O5 can depress the recombination of light-induced charges via prolonging the decay times. The results could be referred to investigate multifunctional optical applications of bismuth semiconductors. |
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title_short |
Impurity doping approach on bandgap narrowing and improved photocatalysis of Ca |
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