Hollow tubular Tb3+and Yb3+ co-doped ordered mesoporous ZnO composite materials and its luminescent properties

Lv, Zhi-jia; Liu, Yu; Yu, Hui; Dong, Xiangting; Yang, Hua

doi:10.1016/j.optmat.2019.01.077

Cited by 9 publications

(3 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Zinc oxide (ZnO) materials are promising in many fields such as for use as thermoelectric materials, − luminescent materials, electrode materials, and gas sensors with advantages from their high excitonic binding energy, high carrier mobility, nontoxicity, thermal stability, abundant supply, and cost-effectiveness. − …”

Section: Introductionmentioning

confidence: 99%

Dramatically Improved Thermoelectric Properties by Defect Engineering in Cement-Based Composites

Wei

Wang

et al. 2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

In recent years, the problem of overheating in summer has been of great concern. Pavements are continuously exposed to solar radiation, and because of high temperatures, pavement temperatures reach 60 to 70 °C. This potential low-grade heat has been unused. Cement-based composites with thermoelectric properties can convert this low-grade heat to useful electrical energy. The importance of this green technology for generating renewable energy and sustainable development has been widely accepted and noticed. However, the power factor of current cement-based composites is too low, and harvesting low-grade heat on a large scale and at low cost requires improving the thermoelectric properties of cement-based composites. In this paper, we present a method to increase the electrical conductivity of ZnO and thus improve the thermoelectric properties of cement-based composites by defect engineering, obtaining a high power factor of 224 μWm–1 K–2 at 70 °C, a record value recently reported for thermoelectric cement-based composites. Zinc oxide powder was treated with a reducing atmosphere to increase the content of oxygen defects and thus improve the electrical conductivity. Pretreated ZnO powder of 5.0 and 10.0 wt % expanded graphite were added to the cement matrix. The ZnO/expanded graphite cement-based composites were made and tested for their thermoelectric properties using a dry pressing process, which exhibited excellent thermoelectric properties. The result showed high conductivity (12.78 S·cm–1), a high Seebeck coefficient (−419 μV/°C), a high power factor (224 μWm–1 K–2), and a high figure of merit value (8.7 × 10–3), which facilitate future large-scale applications. Using the cement-based composites to lay a road of 1 km in length and 10 m in width, 35.2 kW·h of electricity can be collected in 8 h. This study will inspire how to improve thermoelectric performance of cement-based composites.

show abstract

Section: Introductionmentioning

confidence: 99%

Dramatically Improved Thermoelectric Properties by Defect Engineering in Cement-Based Composites

Wei

Wang

et al. 2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…The doped ratio of rare earth, hydrothermal temperature, and hydrothermal time had a great influence on fluorescence intensity and morphology of the composite. , Thus, the three synthetic conditions were explored, and the best synthesis conditions were determined according to the sample with the strongest fluorescence emission peak intensity and the best morphology in this study. In order to narrate expediently, the samples were abbreviated to x EZ- T - t , where x is the number parts of the Eu 3+ content ( x = 10, 12, 14, 16, 18, and 20 wt %), T is the hydrothermal temperature ( T = 150, 160, 170, 180, and 190 °C), t is the hydrothermal time ( t = 4, 5, 6, and 8 h), E represents Eu, and Z represents ZnO.…”

Section: Experimental Proceduresmentioning

confidence: 99%

Preparation of Bitter Melon-like Ordered Porous Fluorinated Eu³⁺–Phenanthroline/ZnO Composite with Yellow Light Emission

Dong

2019

Langmuir

Self Cite

View full text Add to dashboard Cite

The soft template method was used to synthesize the ordered porous ZnO precursor and with 1,10-phenanthroline as an organic ligand, Eu 3+ as a luminescent center ion, and NH 4 F as a fluorine source, a kind of much uniform bitter melon-like ordered porous fluorinated Eu 3+ −phenanthroline/ZnO composite was finally prepared through the hydrothermal method. The average length of the bitter melon-like particles was 0.7−1.0 μm, and its average diameter was 300−400 nm, which had a lot of ordered mesoporous dispersed on the surfaces. The prepared materials showed strong yellow and blue light emission under 394 and 275 nm excitation, respectively. The optimum synthesized conditions were determined according to the synthesis parameter of the sample with the strongest emission peak intensity.

show abstract

“…The present investigation is focused on the study of the terbium rare earth effect on Yb-doped ZnO thin films prepared using the spray pyrolysis technique because of its simplicity, low cost, easy to add doping materials, and the possibility of varying the film luminescent properties by changing the composition of starting solution. It is also promising for high rate and mass production capability of uniform large area coatings in solar cell applications and optoelectronic devices [23,24]. The samples were characterized by various techniques to assess the effect of co-doping on the structural, optical and electrical properties.…”

Section: Introductionmentioning

confidence: 99%

Growth and Characterization of (Tb,Yb) Co-Doping Sprayed ZnO Thin Films

et al. 2020

View full text Add to dashboard Cite

Structural, optical and electrical properties of (ytterbium/terbium) co-doped ZnO thin films deposited on glass substrates using the spray pyrolysis method were investigated. The films exhibited the hexagonal wurtzite structure with a preferential orientation along (002) direction. No secondary phase was observed in the X-ray diffraction detection limit. Atomic force microscopy (AFM) was performed and root means square roughness (RMS) of our samples decreased with terbium content. Photoluminescence measurements showed a luminescence band at 980 nm which is characteristic of Yb3+ transition between the electronic levels 2F5/2 to 2F7/2. This is experimental evidence for an efficient energy transfer from the ZnO matrix to Yb. Hall Effect measurements gave a low electrical resistivity value around 6.0 × 10−3 Ω.cm. Such characteristics make these films of interest to photovoltaic devices.

show abstract

Hollow tubular Tb3+and Yb3+ co-doped ordered mesoporous ZnO composite materials and its luminescent properties

Cited by 9 publications

References 48 publications

Dramatically Improved Thermoelectric Properties by Defect Engineering in Cement-Based Composites

Dramatically Improved Thermoelectric Properties by Defect Engineering in Cement-Based Composites

Preparation of Bitter Melon-like Ordered Porous Fluorinated Eu³⁺–Phenanthroline/ZnO Composite with Yellow Light Emission

Growth and Characterization of (Tb,Yb) Co-Doping Sprayed ZnO Thin Films

Contact Info

Product

Resources

About

Hollow tubular Tb3+and Yb3+ co-doped ordered mesoporous ZnO composite materials and its luminescent properties

Cited by 9 publications

References 48 publications

Dramatically Improved Thermoelectric Properties by Defect Engineering in Cement-Based Composites

Dramatically Improved Thermoelectric Properties by Defect Engineering in Cement-Based Composites

Preparation of Bitter Melon-like Ordered Porous Fluorinated Eu3+–Phenanthroline/ZnO Composite with Yellow Light Emission

Growth and Characterization of (Tb,Yb) Co-Doping Sprayed ZnO Thin Films

Contact Info

Product

Resources

About

Preparation of Bitter Melon-like Ordered Porous Fluorinated Eu³⁺–Phenanthroline/ZnO Composite with Yellow Light Emission