Journal Pre-proof ZIF-67 MOF-derived Unique Double-shelled Co 3 O 4 /NiCo 2 O 4 Nanocages for Superior Gas-sensing Performances Jing Tan, Shahid Hussain, Chuanxin Ge, Mingsong Wang, Sufaid Shah, Guiwu Liu, Guanjun Qiao PII: S0925-4005(19)31450-9 DOI: https://doi.org/10.1016/j.snb.2019.127251 Reference: SNB 127251 To appear in: Sensors and Actuators: B. Chemical Received Date: 2 June 2019 Revised Date: 5 October 2019 Accepted Date: 8 October 2019 Please cite this article as: Tan J, Hussain S, Ge C, Wang M, Shah S, Liu G, Qiao G, ZIF-67 MOF-derived Unique Double-shelled Co 3 O 4 /NiCo 2 O 4 Nanocages for Superior Gas-sensing Performances, Sensors and Actuators: B. Chemical (2019), doi: https://doi.org/10.1016/j.snb.2019.127251 This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. © 2019 Published by Elsevier.