scholarly journals Photocatalytic Crystalline and Amorphous TiO2 Nanotubes Prepared by Electrospinning and Atomic Layer Deposition

Molecules ◽  
2021 ◽  
Vol 26 (19) ◽  
pp. 5917
Author(s):  
Orsolya Kéri ◽  
Eszter Kocsis ◽  
Dániel Attila Karajz ◽  
Zsombor Kristóf Nagy ◽  
Bence Parditka ◽  
...  

In this work core/shell composite polymer/TiO2 nanofibers and from those TiO2 nanotubes were prepared. First, poly(vinyl alcohol) (PVA) and poly(vinylpyrrolidone) (PVP) fibers were synthetized by electrospinning. They were covered with a 100 nm thick amorphous TiO2 layer by atomic layer deposition at 50 °C. Later the polymer core was removed by two different methods: dissolution and annealing. In the case of dissolution in water, the as-prepared TiO2 nanotubes remained amorphous, while when annealing was used to remove the polymers, the TiO2 crystallized in anatase form. Due to this, the properties of amorphous and crystalline TiO2 nanotubes with exactly the same structure and morphology could be compared. The samples were investigated by SEM-EDX, ATR-IR, UV-Vis, XRD and TG/DTA-MS. Finally, the photocatalytic properties of the TiO2 nanotubes were studied by decomposing methyl-orange dye under UV light. According to the results, crystalline anatase TiO2 nanotubes reached the photocatalytic performance of P25, while amorphous TiO2 nanotubes had observable photocatalytic activity.

Author(s):  
Benjamin Rich ◽  
Yael Etinger-Geller ◽  
G. Ciatto ◽  
A Katsman ◽  
Boaz Pokroy

Size effects and structural modifications in amorphous TiO2 films deposited by atomic layer deposition (ALD) were investigated. As with the previously investigated ALD-deposited Al2O3 system we found that the film’s...


ChemistryOpen ◽  
2018 ◽  
Vol 7 (10) ◽  
pp. 797-802 ◽  
Author(s):  
Selda Ozkan ◽  
JeongEun Yoo ◽  
Nhat Truong Nguyen ◽  
Shiva Mohajernia ◽  
Raul Zazpe ◽  
...  

2017 ◽  
Vol 121 (33) ◽  
pp. 17727-17736 ◽  
Author(s):  
Maïssa K. S. Barr ◽  
Loïc Assaud ◽  
Nicolas Brazeau ◽  
Margrit Hanbücken ◽  
Spyridon Ntais ◽  
...  

2017 ◽  
Vol 419 ◽  
pp. 497-502 ◽  
Author(s):  
Nóra Justh ◽  
Tamás Firkala ◽  
Krisztina László ◽  
János Lábár ◽  
Imre Miklós Szilágyi

2018 ◽  
Vol 10 (5) ◽  
pp. 800-804 ◽  
Author(s):  
Jaehong Yoon ◽  
Rizwan Khan ◽  
Il-Kwon Oh ◽  
Hyungjun Kim ◽  
Han-Bo-Ram Lee

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