I still remember the first time I stepped into Nanyang Technological University on July 17, 2011.I felt so excited and curious to start a PhD journey in this rain forest surrounded but advanced facilities equipped campus.In the following four years, both the people and the things I met here really did not disappoint me.I am really enjoying to living here.Now it may be time to say goodbye to this short stage of my life, from which I benefit in my whole life.First of all, I would like to express my sincere gratitude to my supervisor, Assoc.Prof. Hongwei Duan.His great support and invaluable supervision really help me significantly during my whole PhD career.He not only brings me into a world of nanomaterials, but also teaches me how to think more scientifically.For me, learning seems to just begin from his lab.Meanwhile, I would like to extend my gratitude to Prof. Phillip B.