An overview of advanced methods for the characterization of oxygen vacancies in materials

Ye, Kai‐Hang; Li, Kunshan; Lu, Yirui; Guo, Zhongjie; Ni, Nan; Liu, Hong; Huang, Yongchao; Ji, Hongbing; Wang, Pingshan

doi:10.1016/j.trac.2019.05.002

Cited by 403 publications

(187 citation statements)

References 95 publications

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“…In the case of Au/D-TiO 2 , the crystallographic peaks of Au could be detected ( Figure 1A). Defects in D-TiO 2 were tested by electron paramagnetic resonance (EPR) measurements ( Figure 1B), which indicated an aerobic vacancy defect with a g value of 2.015 [23][24][25].…”

Section: Resultsmentioning

confidence: 99%

Defective Titanium Dioxide-supported Ultrasmall Au Clusters for Photocatalytic Hydrogen Production

Zhang

et al. 2020

Front. Phys.

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Ultrasmall precious metal clusters have attracted extensive attention for providing a very specific surface and promoting electron transfer. In this work, ultrasmall Au clusters based on defective TiO2 nanosheets (Au/D-TiO2) were prepared and introduced into photocatalytic hydrogen evolution. Different defects of TiO2 nanosheets (D-TiO2) were constructed using a heating process and then loaded with Au clusters. Compared with bare TiO2, Au clusters established on defective TiO2 nanosheets with a narrower band gap showed higher light absorption performances, resulting in obviously enhanced photocatalytic hydrogen production performances. The Au/D-TiO2 displayed the greatly enhanced photocatalytic hydrogen evolution activity of 3,142.33 μmol h−1 g−1, which was over 45 times than the pure TiO2. The results showed that the catalysts had good prospects in the field of photocatalytic hydrogen production.

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Section: Resultsmentioning

confidence: 99%

Defective Titanium Dioxide-supported Ultrasmall Au Clusters for Photocatalytic Hydrogen Production

Zhang

et al. 2020

Front. Phys.

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“…As a computing method for studying the electronic structure, density functional theory (DFT) was previously proved to perform very well both for geometry optimizations and many other molecular properties [31]. Therefore, the molecular geometry optimization and vibrational spectra calculations in this experiment were studied with the DFT method.…”

Section: The Assignment Of Fipronil Raman Bandsmentioning

confidence: 99%

“…Raman spectroscopy provided detailed structural information, and for the purpose of applying the SERS method in fipronil detection, the experimental results of the SERS bands for solid fipronil were assigned and distributed according to the simulation results of DFT calculation and previous report [31,41]. The optimized structural representation of fipronil in its neutral form is shown in Figure 2, while after the addition of fipronil on multibranch AuNPs-substrate, the most significant SERS bands were observed at 296 cm −1 [β(F 12 -C 9 -F 11 ) + γ(F 10 -C 3 -F 12 -C 9 )], 361 cm −1 [δ(N 24 -C 23 -C 18 Figure 3A).…”

Section: Practical Application For Sensing Fipronilmentioning

confidence: 99%

Multibranch Gold Nanoparticles as Surface-Enhanced Raman Spectroscopy Substrates for Rapid and Sensitive Analysis of Fipronil in Eggs

Zhao

Huang

Zhu

2019

Sensors

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A sensitive strategy to rapidly detect fipronil residues in eggs using multibranch gold nanoparticles (AuNPs) as the substrate of surface-enhanced Raman spectroscopy (SERS) was investigated in this study. Under optimized conditions, fipronil molecules preferentially deposited on the multibranch gold nanoparticles with preferential (111) facet-oriented growth due to its low surface energy. This anisotropic growth promoted the increase of SERS “hot spots”, inducing a huge enhancement of Raman signals of the fipronil. An external standard calibration method was employed for quantitative analysis, and the method was validated for linearity, sensitivity, repeatability and recovery. Good linearity were found in the concentration range of 10 ng/L~10 mg/L in fipronil acetone solution (R2 = 0.9916) and 8 × 10−5 mg/m2 to 0.8 mg/m2 on eggshells (R2 = 0.9906), respectively. The recovery rate based on acetone recovered fipronil on eggshells and in egg liquids was 80.13%~87.87%, and 81.34%~88.89%, respectively. The SERS assay was successfully used to monitor fipronil in eggs.

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“…Natural cobalt-corrinoids and their synthetic analogs have recently been widely explored as transporters of biologically important molecules into eukaryotic or prokaryotic cells [ 1 , 2 ], fluorophore probes [ 3 ], antivitamins [ 4 , 5 ], and a catalyst [ 6 ] like other commonly known catalytic materials [ 7 ]. Vitamin B 12 (cyanocobalamin, (CN)Cbl), belonging to the best studied among all corrinoid molecules, is a micronutrient isolated from specific bacterial sources e.g., Propionibacteria and Pseudomonas denitnpcans [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Resonance Raman Optical Activity Spectroscopy in Probing Structural Changes Invisible to Circular Dichroism Spectroscopy: A Study on Truncated Vitamin B12 Derivatives

et al. 2020

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This work demonstrates resonance Raman optical activity (RROA) spectra of three truncated vitamin B12 derivatives modified within the nucleotide loop. Since truncated cobalamins possess sufficiently high rotational strength in the range of ROA excitation (532 nm), it was possible to record their spectra in the resonance condition. They showed several distinct spectral features allowing for the distinguishing of studied compounds, in contrast to other methods, i.e., UV-Vis absorption, electronic circular dichroism, and resonance Raman spectroscopy. The improved capacity of the RROA method is based here on the excitation of molecules via more than two electronic states, giving rise to the bisignate RROA spectrum, significantly distinct from a parent Raman spectrum. This observation is an important step in the dissemination of using RROA spectroscopy in studying the complex structure of corrinoids which may prove crucial for a better understanding of their biological role.

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An overview of advanced methods for the characterization of oxygen vacancies in materials

Cited by 403 publications

References 95 publications

Defective Titanium Dioxide-supported Ultrasmall Au Clusters for Photocatalytic Hydrogen Production

Defective Titanium Dioxide-supported Ultrasmall Au Clusters for Photocatalytic Hydrogen Production

Multibranch Gold Nanoparticles as Surface-Enhanced Raman Spectroscopy Substrates for Rapid and Sensitive Analysis of Fipronil in Eggs

Resonance Raman Optical Activity Spectroscopy in Probing Structural Changes Invisible to Circular Dichroism Spectroscopy: A Study on Truncated Vitamin B12 Derivatives

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