1. 1
Hydrothermal Gas/Vapor Crystallization of Highly Ordered
TiO2 Nanotubes with Tunable Nanocrystal Orientation
Aaron Kirkey
Supervisor: Prof. Tsun-Kong Sham & Jun Li
Department of Chemistry
Western University
2. 2
Water vapor processing at 90℃ under ambient pressure
Lamberti et al. Sci. Rep. 2015, 5, 7808
Our approach:
water vapor processing under hydrothermal
condition
1. processing temperature
2. processing time
3. water volume
Our gain:
1. NT morphology change
2. NT crystallinity
Step One: Water Vapor Processing
3. 3
HF/water vapor processing at 130℃ under hydrothermal
condition
Ding et al. Sci. Rep. 2015, 5, 17773
Our approach (similar to the literature):
HF/water vapor processing under
hydrothermal condition
1. processing temperature
2. processing time
3. HF/water volume
4. HF concentration
Our gain:
1. NT morphology change
2. NT crystallinity & crystal orientation
(001/101)
Step Two: HF/Water Vapor Processing
4. 4
Step Three: NH3/Water Vapor Processing
This one is never been reported before
Our approach (similar to the previous two):
NH3/water vapor processing under
hydrothermal condition
1. processing temperature
2. processing time
3. NH3/water volume
4. NH3 concentration (ammonia solution)
Our gain:
1. NT morphology change
2. NT crystallinity & crystal orientation
(001/101)
3. N doping in TiO2
