Reduced graphene oxide/MoS2 hybrid films for room-temperature formaldehyde detection

A hybrid film composed of reduced graphene oxide (rGO) and molybdenum disulfide (MoS2) nanosheet-assemblies has been fabricated for high-performance formaldehyde (HCHO) detection, by a simple layer-by-layer self-assembly (LBL SA) method. The rGO/MoS2 hybrid films not only show improved sensitivity to HCHO at room temperature compared to solely rGO or MoS2 films, but also exhibit fast response characteristics and good reproducibility. The synergetic effects of rGO and MoS2 on HCHO sensing enhancement of the hybrid films are attributed to the energy level matching among rGO, MoS2 and HCHO, which lead to a two-stepped efficient electron transfer from HCHO to rGO.