AUTHOR=Akbar Sheikh A. , Drmosh Qasem A. , Li Xiaogan TITLE=Editorial: Nano-Hetero-Structures for Chemical Sensing: Opportunities and Challenges JOURNAL=Frontiers in Materials VOLUME=6 YEAR=2019 URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2019.00332 DOI=10.3389/fmats.2019.00332 ISSN=2296-8016