Researchers have achieved ultrahigh gas selectivity and response for detecting ppb levels of xylene by doping Pt in CoCr2O4 hollow spheres. This method proved more effective than adding Au or Pd, which were less effective or even deteriorated performance. – Scientific Journal cover design by scapiens

https://pubs.rsc.org/en/content/articlelanding/2019/cc/c8cc08186g#!divAbstract