1. Full name: Tho_Nguyen Duc                                       2. Sex: male

3. Date of birth: 16-12-1979                                            4. Place of birth: Lien Bat, Ung Hoa, Hanoi

5. Admission decision number: 3205/QĐ-SĐH Dated: 08-11-2010

6. Changes in academic process:                      

7. Official thesis title: Study and synthesize electrode of sensor electrochemical from nano Perovskite materials LaMO3 (M = Mn, Fe, Ni, Co)

8. Major: Nano materials and devices                  9. Code: Pilot specialty

10. Supervisors:

Assoc. Prof. Dr. Nhat_Nam Hoang

Assoc. Prof. Dr. Thang_Nguyen Duc

11. Summary of the new findings of the thesis:

The sensors Pt/YSZ/LaFeO3 shown high sensitivity and selectivity with NO2 compared to NO, CO, C3H8 and CH4. When the sintering temperature increases, the voltage change DV with NO2 gas of sensor Pt/YSZ/LaFeO3 rapid reduction in sintering temperature TS = 900, then increase the sintering temperature to 1300 °C and maximum at Ts = 1200 °C. The value of the voltage change and selectivity can be explained by the process of sintering caused the change of parameters such as microstructure, porosity, morphology and particle size of the metal oxide layer LaFeO3 and junction of YSZ/metal oxide.

The electrochemical sensor electrode based on LaFeO3 have highest sensitivity to NO2 when compared with the perovskite oxide electrodes using other 3d transition metals (Mn, Co, and Ni). This characteristic of the sensor Pt/YSZ/LaFeO3 interactions involving catalytic gas recovery and low electrical conductivity of the oxide LaFeO3.

The sensors Pt/YSZ/LaFeO3 with high sintering temperature Ts = 1200 °C have high sensitivity to NO2 gas at high operating temperatures (650 °C), which is an advantage for applications in high temperature.

The results of the sensitivity NO2, NO, CO, C3H8 and CH4 sensors Pt/YSZ/LaMO3 (M = Mn with, Fe, Co, and Ni) with sintering temperatures Ts = 1200 ° C showed that main relatively with 3d transition metals such as for valency, gas catalytic activity, reversible air interactive and conductivity.

12. Practical applicability, if any: Gas sensor

13. Further research directions, if any: Gas sensor

14. Thesis-related publications:

2016_Nguyen Duc Tho, Do Van Huong, Ho Truong Giang, Pham Quang Ngan, Giang Hong Thai, Do Thi Anh Thu, Do Thi Thu, Nguyen Thi Minh Tuoi, Nguyen Ngoc Toan, Pham Duc Thang, Hoang Nam Nhat, “High temperature calcination for analyzing influence of 3d transition metals on gas sensing performance of mixed potential sensor Pt/YSZ/LaMO3 (M = Mn, Fe, Co, Ni)”, Electrochimica Acta 190, 215-220 (2016).

2016_Nguyen Duc Tho, Do Van Huong, Pham Quang Ngan, Giang Hong Thai, Do Thi Anh Thu, Do Thi Thu, Nguyen Thi Minh Tuoi, Nguyen Ngoc Toan, Ho Truong Giang, “Effect of sintering temperature of mixed potential sensor Pt/YSZ/LaFeO3 on gas sensing performance”, Sensors and Actuators B 224, 747-754 (2016). 

2015_Nguyen Duc Tho, Do Van Huong, Pham Quang Ngan, Giang Hong Thai, Do Thi Thu, Đo Thi Anh Thu, Ho Truong Giang, Hoang Nam Nhat, “Nano-oxit LaNiO3 was synthesized with a typical sol-gel method using for electrode sensor of electrochemical-sensor”, Journal of Chemistry 53(3E12), 488-492 (2015). 

2015_Nguyen Duc Tho, Do Van Huong, Pham Quang Ngan, Giang Hong Thai, Do Thi Anh Thu, Ho Truong Giang, Hoang Nam Nhat, “Electrochemical sensor  Pt/YSZ/Pt-LaCoO3 desired for in-situ measurement of corrosive gases from fuel combustion process”, Journal of Science and Technology 53(1A), 88-95 (2015).

2015_Nguyen Duc Tho, Ho Truong Giang, Do Van Huong, Do Thi Anh Thu, Nguyen Ngoc Toan, Hoang Nam Nhat, Pham Duc Thang, “Electrochemical sensor based on YSZ electrolyte and perovskite ABO3 oxide”, Proceedings of the 9th Conference on Solid State Physics and Materials Science-SPMS2015, 331-334 (2015).

2014_Do Van Huong, Ho Truong Giang, Pham Quang Ngan, Giang Hong Thai, Do Thi Thu, Do Thi Anh Thu, Nguyen Duc Tho, “Gas-sensitive characteristics of YSZ electrolyte sensor and perovskite electrode SmFeO3”, Journal of Chemisstry 52(6B), 236-239 (2014).