The work of this paper was completed under the encouragement and guidance of my tutor Professor XXX, who introduced all the people who helped me in the process of writing this paper. Without his consistent and enlightening guidance, this paper would not be what it is now.

2. Helping teachers

Professor XXX's scientific research work in my laboratory has given me great help, and I would like to express my heartfelt thanks to Teacher XXX.

3. Helping classmates and friends.

During my research work and thesis writing in the laboratory, XXX and other students gave enthusiastic help to my research work and thesis writing, and put forward valuable opinions. I would like to express my heartfelt thanks here.

4. Family and friends

Finally, in the process of doing scientific research and thesis writing in the laboratory, I thank my family for their understanding and support, so that I can concentrate on finishing my studies and finishing my scientific research and thesis writing.