Influence of annealing atmosphere for controlling oxygen vacancies of PVP-capped TiO2 nanoparticles

2021 ◽  
Vol 23 (10) ◽  
Author(s):  
P. Srilakshmi ◽  
M. Sivakumar ◽  
A. Kathirvel ◽  
A. Uma Maheswari
Keyword(s):  
Tio2 Nanoparticles ◽  
Oxygen Vacancies ◽  
Annealing Atmosphere

Highly-dispersed TiO2 nanoparticles with abundant active sites induced by surfactants as a prominent substrate for SERS: charge transfer contribution

2017 ◽  
Vol 19 (33) ◽  
pp. 22302-22308 ◽  
Author(s):  
Libin Yang ◽  
Di Yin ◽  
Yu Shen ◽  
Ming Yang ◽  
Xiuling Li ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Tio2 Nanoparticles ◽  
Active Sites ◽  
Oxygen Vacancies ◽  
Surface Oxygen ◽  
Highly Dispersed

Highly-dispersed TiO2 with abundant surface oxygen vacancies was presented as an effective substrate for charge-transfer-induced SERS.

Introduction of oxygen vacancies and fluorine into TiO2 nanoparticles by co-milling with PTFE

2012 ◽  
Vol 187 ◽  
pp. 51-57 ◽  
Author(s):  
Mamoru Senna ◽  
Vladimir Šepelák ◽  
Jianmin Shi ◽  
Benjamin Bauer ◽  
Armin Feldhoff ◽  
...  
Keyword(s):  
Tio2 Nanoparticles ◽  
Oxygen Vacancies

Dielectric loss of niobium-doped and undoped polycrystalline Sr2Bi4Ti5O18

2005 ◽  
Vol 20 (4) ◽  
pp. 971-974 ◽  
Author(s):  
Wang-ping Lu ◽  
Jun Zhu ◽  
Hui Sun ◽  
Xiao-bing Chen
Keyword(s):  
Dielectric Properties ◽  
Dielectric Loss ◽  
Remnant Polarization ◽  
Oxygen Vacancies ◽  
Relaxation Mechanism ◽  
Annealing Atmosphere ◽  
Niobium Doping ◽  
Vanadium Doping ◽  
Niobium Doped ◽  
Nb Doping

Ferroelectric and dielectric properties of niobium-doped Sr2Bi4Ti5O18 ceramics were investigated. Compared with the undoped ceramics, the niobium-doped ceramics exhibited obviously increased remnant polarization 2Pr, which is similar to the case of vanadium doping. However, the mechanisms of increasing of 2Pr by vanadium and niobium doping are quite different. In the case of Nb-doping, one relaxation peak P1 is found on the dielectric loss curves D(T) at 70 °C. The dependence of the peak on various annealing atmosphere indicates that the relaxation mechanism of the peak is related to oxygen vacancies. With niobium doping, the P1 peak declines gradually. These results suggest that the substitution of Ti4+ by a small amount of Nb5+ can result in the decreasing of the concentration of oxygen vacancies. Thus, the increase in 2Pr of Nb-doped Sr2Bi4Ti5O18 could be attributed to the significant weakening of defect pinning.

scholarly journals Annealing atmosphere effect on the resistive switching and magnetic properties of spinel Co3O4 thin films prepared by a sol–gel technique

RSC Advances ◽  
2019 ◽  
Vol 9 (22) ◽  
pp. 12615-12625 ◽  
Author(s):  
Chuangye Yao ◽  
Muhammad Ismail ◽  
Aize Hao ◽  
Santhosh Kumar Thatikonda ◽  
Wenhua Huang ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Resistive Switching ◽  
Oxygen Vacancies ◽  
Sol Gel ◽  
Annealing Atmosphere ◽  
Atmosphere Effect ◽  
Gel Technique

The resistive switching and magnetic properties can be enhanced by controlling oxygen vacancies via the annealing atmosphere effect.

scholarly journals Thermal Annealing Induced Controllable Porosity and Photoactive Performance of 2D ZnO Sheets

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1352 ◽  
Author(s):  
Yuan-Chang Liang ◽  
Chen-Shiang Hung ◽  
Wei-Cheng Zhao
Keyword(s):  
Oxygen Vacancies ◽  
Annealing Temperature ◽  
Ambient Air ◽  
Hydrogen Atmosphere ◽  
Crystal Defects ◽  
Annealing Atmosphere ◽  
Hydrogen Treatment ◽  
Electron Hole ◽  
X Ray ◽  
Surface Crystal

Porous ZnO sheets containing various degrees of a nanoscaled pore were successfully synthesized using a simple hydrothermal method and various postannealing procedures. The porosity features of the ZnO sheets can be easily tuned by changing both the annealing temperature and annealing atmosphere. The dense porous nature of ZnO sheets is beneficial to enhance light absorption. Moreover, the substantially increased oxygen vacancies in the ZnO sheets were observed especially after the hydrogen treatment as revealed in the X-ray photoelectron spectroscope and photoluminescence analyses. The high density of surface crystal defect enhanced the photoinduced electron-hole separation rate of the ZnO sheets, which is crucial for an improved photoactivity. The porous ZnO sheets formed at a hydrogen atmosphere exhibited superior photoactive performance than the porous ZnO sheets formed at the high-temperature ambient air annealing. The dense pores and massive crystal defects formed by a hydrogen atmosphere annealing in the ZnO crystals might account for the observed photoactive behaviors in this study.

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