Thanomkiat, O., Paipitak, K., Noonuruk, R. and Mekprasart, W. 2016. XPS Study in Electrochromic Process of Zn-doped NiO and Zndoped WO3 Thin Films Prepared by Spin Coating Method. Thai Journal of Nanoscience and Nanotechnology. 1, 1 (Jun. 2016), 13–20.