A Photoactivated Gas Detector for Toluene Sensing at Room Temperature Based on New Coral-Like ZnO Nanostructure Arrays oleh Li-Ko Yeh, Jie-Chun Luo, Min-Chun Chen, Chih-Hung Wu, Jian-Zhang Chen, I-Chun Cheng, Cheng-Che Hsu, Wei-Cheng Tian