Effect of Zn Doping in CuO Octahedral Crystals towards Structural, Optical, and Gas Sensing Properties oleh Chandra Prakash Goyal, Deepak Goyal, Sinjumol K. Rajan, Niranjan S. Ramgir, Yosuke Shimura, Mani Navaneethan, Yasuhiro Hayakawa, C. Muthamizhchelvan, Hiroya Ikeda, S. Ponnusamy