Enhanced optical and photocatalytic properties of Ag quantum dots-sensitized nanostructured TiO2/ZnO heterojunctions

Tao, Jiajia; Gong, Zezhou; Yao, Guang; Cheng, Yunlang; Zhang, Miao; Lv, Jianguo; Shi, Shiwei; He, Gang; Jiang, Xishun; Chen, Xiaoshuang; Sun, Zhaoqi

doi:10.1016/j.jallcom.2016.07.074

Cited by 60 publications

(21 citation statements)

References 53 publications

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“…Stirring was continued for another 15 minutes until the solution was clear. The clear solution was transferred to a 50 mL volume Teflon‐lined stainless steel autoclave where the FTO substrate was placed at a certain angle on the Teflon‐lined wall with the conductive side facing down . Hydrothermal synthesis was carried out in an oven at 150°C for 12 hours under the reaction conditions .…”

Section: Methodsmentioning

confidence: 99%

“…The clear solution was transferred to a 50 mL volume Teflon‐lined stainless steel autoclave where the FTO substrate was placed at a certain angle on the Teflon‐lined wall with the conductive side facing down . Hydrothermal synthesis was carried out in an oven at 150°C for 12 hours under the reaction conditions . After the reaction, the sample was cooled to room temperature, and then washed several times with deionized water and air‐dried .…”

Section: Methodsmentioning

confidence: 99%

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Enhancement of photocatalytic and photoelectrochemical properties of BiOI nanosheets and silver quantum dots co‐modified TiO₂ nanorod arrays

et al. 2019

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In this study, TiO2 nanorod arrays (TNR), Ag quantum dots (QDs) sensitized with TNR TiO2/Ag, bismuth oxyhalide (BiOI) nanosheets, and Ag QDs co‐modified with TNR and TiO2/BiOI/Ag (TBA) were prepared by a stepwise process. The morphological, structural, compositional, optical, photocatalytic (PC), and photoelectrochemical (PEC) properties of the samples were investigated. The TBA‐2 sample exhibited the highest photocurrent density (281.8 μA/cm2) and photodegradation efficiency (93.3%), with values 9.7 times and 2.25 times higher than those for TNR, respectively. The improvement in sample performance can be attributed to the formation of a heterojunction between BiOI and TiO2, thereby enhancing the absorption of visible light and improving the charge separation efficiency; Ag QDs limit interfacial electron‐hole pair recombination. The experimental results show that TBA can effectively promote light‐induced carrier transport and visible light absorption, while inhibiting the recombination rate of the electron‐hole pairs, PEC, and PC.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Enhancement of photocatalytic and photoelectrochemical properties of BiOI nanosheets and silver quantum dots co‐modified TiO₂ nanorod arrays

et al. 2019

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“…reached total degradation of dye in 75 minutes, a higher activity when compared to pure TiO 2 that reached only 90% of degradation at the same time, showing that the heterojunction promotes better charge separation and increases the recombination time of electron-hole pairs (e − /h + ). rough the hydrothermal synthesis, Tao et al [15] deposited the heterostructures of TiO 2 /ZnO/Ag on FTO substrate where Ag 0 acts like antennae capturing the electrons photogenerated and then increased the recombination time for improving the degradation of methyl orange dye. e photocatalyst TiO 2 /ZnO/Ag reached 96% of degradation of dye in 120 minutes, better than the results of pure TiO 2 (46%) and of TiO 2 /ZnO heterostructure (62%) at same conditions.…”

Section: •−mentioning

confidence: 99%

Nb‐Doped TiO₂ Photocatalysts Used to Reduction of CO₂ to Methanol

Nogueira

Lustosa

Kobayakawa

et al. 2018

Advances in Materials Science and Engineering

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In pursuit of higher photoactivity, Nb-doped TiO 2 powders were evaluated in the reduction of CO 2 . e replacement of Ti by Nb in the crystalline structure of TiO 2 promoted methanol formation. Nb-doped TiO 2 powders were successfully synthesized in Nb concentrations of 0.0, 0.5, 1.0, and 2.5% (w/w � weight/weight) using the Pechini method. e materials were calcined at 500°C for two hours to promote the formation of the anatase crystalline phase. After characterization, the powders were modified through an Nb 0 magnetron sputtering deposition using a metallic target in vacuum conditions of 2 × 10 −3 torr, with a deposition time of 10 minutes, and calcination again at 500°C for two hours. e resulting powders showed a surface area up to 30 m 2 /g. e Pechini method promoted the substitution of Ti 4+ for Nb 4+ as observed using XRD and XPS techniques at the crystalline structure and at the surface of the powder. Furthermore, the presence of Nb 0 was also observed at the powder's surface. e presence of Nb in the crystalline structure increased the photoactivity of powders when compared to nonmodified TiO 2 powders, while the Nb 0 deposition at the powder's surface decreased the photoactivity for all the investigated compositions.

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“…Magnetron sputtering was carried out in an argon(99.999%) gas atmospher. The flow rates of Ar were maintained at 40sccm during the process of depositing [13]. In order to clean the target surface prior to ZnO deposition, the target was pre-sputtered for 30 min.…”

Section: Synthesis Of the Zno/tio 2 Hybrid Nanofibresmentioning

confidence: 99%

Construction of TiO2/ZnO Heterostructure for Photocatalytic Application

Pan¹,

Jiang²,

Dong³

et al. 2017

dteees

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Abstract. The double hierarchical nanostructure of TiO 2 /ZnO were prepared by an effective way of combining electrospinning and the RF Magnetron Sputtering technique. In this work, the anatase TiO 2 nanofibers were prepared by electrospinning polyvinylpyrrolidone (PVP)/tetrabutyl titanate (Ti(OBu) 4 ) solutions on glass substrates followed by calcination at 500℃, and then dense secondary ZnO nanorods were grown by magnetron sputtering technique. It shows that ZnO nanocrystals distributed on the TiO 2 nanofibers could serve as favorable hole channels and receptors for efficient separation of photoexcited charge carriers, which results in significantly enhanced photocatalytic performanes of ZnO/TiO 2 heterostructure compared with TiO 2 nanofibers, and ZnO film. The presented approach is hoped to be applied to the construction of other photocatalytic systems.

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Enhanced optical and photocatalytic properties of Ag quantum dots-sensitized nanostructured TiO2/ZnO heterojunctions

Cited by 60 publications

References 53 publications

Enhancement of photocatalytic and photoelectrochemical properties of BiOI nanosheets and silver quantum dots co‐modified TiO₂ nanorod arrays

Enhancement of photocatalytic and photoelectrochemical properties of BiOI nanosheets and silver quantum dots co‐modified TiO₂ nanorod arrays

Nb‐Doped TiO₂ Photocatalysts Used to Reduction of CO₂ to Methanol

Construction of TiO2/ZnO Heterostructure for Photocatalytic Application

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Enhanced optical and photocatalytic properties of Ag quantum dots-sensitized nanostructured TiO2/ZnO heterojunctions

Cited by 60 publications

References 53 publications

Enhancement of photocatalytic and photoelectrochemical properties of BiOI nanosheets and silver quantum dots co‐modified TiO2 nanorod arrays

Enhancement of photocatalytic and photoelectrochemical properties of BiOI nanosheets and silver quantum dots co‐modified TiO2 nanorod arrays

Nb‐Doped TiO2 Photocatalysts Used to Reduction of CO2 to Methanol

Construction of TiO2/ZnO Heterostructure for Photocatalytic Application

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Enhancement of photocatalytic and photoelectrochemical properties of BiOI nanosheets and silver quantum dots co‐modified TiO₂ nanorod arrays

Enhancement of photocatalytic and photoelectrochemical properties of BiOI nanosheets and silver quantum dots co‐modified TiO₂ nanorod arrays

Nb‐Doped TiO₂ Photocatalysts Used to Reduction of CO₂ to Methanol