AUTHOR=Xie Lijuan , Li Zhong , Sun Linchao , Dong Baoxia , Fatima Qawareer , Wang Zhe , Yao Zhengjun , Haidry Azhar Ali TITLE=Corrigendum: Sol-gel Synthesis of TiO2 With p-Type Response to Hydrogen Gas at Elevated Temperature JOURNAL=Frontiers in Materials VOLUME=6 YEAR=2019 URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2019.00184 DOI=10.3389/fmats.2019.00184 ISSN=2296-8016