AUTHOR=Zhao Jing , Chen Ou , He Jie , Zou Shengli TITLE=Editorial: Metal and Semiconductor Nanocrystals JOURNAL=Frontiers in Chemistry VOLUME=7 YEAR=2019 URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2019.00310 DOI=10.3389/fchem.2019.00310 ISSN=2296-2646