VNU Journal of Science Mathematics – Physics, Vol 37, No 3 (2021) 32 41 32 Original Article Facile Hydrothermal Method for Fabrication of Seedless ZnO Nanorod/GO Composite on PCB Nguyen Xuan Sang1,*, Nguyen Hoang Mai1, Pham Thi Thuy1, Nguyen Tri Tuan2, Pham Van Tuan3, Hoang Ba Cuong4 1Saigon University, 273 An Duong Vuong, District 5, Ho Chi Minh City, Vietnam 2College of Natural Sciences, Campus II, Can Tho University, 3/2 Street, Can Tho City, Vietnam 3International Training Institute for Ma[.]