Novel core–shell polyaniline@ZnIn ₂ S ₄ core–shell heterostructure photocatalysts have been prepared using a simple synthesis process, and they exhibit superior performances of photocatalytic N ₂ reduction to NH ₃ in an atmospheric environment.

Sulfur doped MoO ₂ nanospheres with a hollow structure were synthesized by a simple hydrothermal synthesis method. Profiting from the S atom doping, MoO ₂ manifests high SERS sensitivity to organic pollutants.