Graphene network in copper sulfide leading to enhanced thermoelectric properties and thermal stability

The 3D graphene network is introduced into the Cu2-xS matrix by a facile technique, leading to a significant ZT enhancement with the highest ZT up to 1.56 and a high PF of 1197 μW m−1 K−2 at 873 K achieved for the sample with 0.75 wt% graphene.154