Vacuum Based Gas Sensing Material Characterization System for Precise and Simultaneous Measurement of Optical and Electrical Responses oleh Jie Wei, Meng Zhao, Cong Wang, Jun Wang, Jian-Min Ye, Yu-Chen Wei, Zhe-Yi Li, Run Zhao, Guo-Zhen Liu, Yan-Hong Geng, Rui Wang, Hui-Dong Xiao, Ying Li, Chao-Ya Li, Zhi-Qiang Gao, Ju Gao