Freestanding flexible, pure and composite form of reduced graphene oxide paper for ammonia vapor sensing

Abstract

Metal oxides based graphene nanocomposites were used for ammonia vapour sensing. The self-assembly process was adopted to prepare freestanding flexible pure rGO, CeO 2 -rGO and SnO 2 -rGO composite papers. The structural studies confirmed the formation of rGO composite papers. The ammonia vapor sensing was demonstrated using an impedance analyzer at different humidity levels as well as concentration. The CeO 2 -rGO composite paper achieved a sensitivity of 51.70 ± 1.2%, which was higher than that of pure rGO and SnO 2 -rGO composite paper. Both the surfaces (top and bottom) of the papers are active in efficiently sensing ammonia, which makes the present work unique. The results reveal that metal oxide/rGO papers can be effectively utilized in real time sensor application.

Review on Smart Gas Sensing Technology

“…As a typical representative of two-dimensional nano-materials, graphene has a thickness of atomic size, every atom of graphene may be considered a surface atom and as a result, every atom site may be involved in the gas interactions, which causes its high sensitive sensor response with the lowest detection capability to even a single molecule [40]. Further, such graphene oxide (GO) [41] and reduced graphene oxide (RGO) [42] which are gained by functionalized graphene have been got more and more attention for their sensitive for different kinds of gases [43,44,45].…”

Graphene-based nanocomposites in analytical extraction processes

“…To a lesser extent, non-magnetic metal oxides (MO x ), such as zirconium dioxide (ZrO 2 ) [56], tin oxide (SnO 2 ) [57], and cerium oxide (CeO 2 ) [57], were also hybridised with rGO. These nanocomposites can be also prepared by one-pot solvothermal treatment of GO and metal precursors in the presence of a reducing agent [56].…”

“…These nanocomposites can be also prepared by one-pot solvothermal treatment of GO and metal precursors in the presence of a reducing agent [56]. MO x can be easily loaded onto rGO taking advantage of its mesoporous structure [57]. Mesoporous MO x are constructed from highly crystalline NPs ordered into close-packed mesostructures possessing uniform pore size distribution [58].…”

Exploration of the temperature-dependent correlations present in the structural, morphological and electrical properties of thermally reduced free-standing graphene oxide papers

“…A recent review article [41] can be referred to by the reader for a comparative study on the various scalable routes to synthesize rGO. rGO can be processed into various three-dimensional structures such as free-standing rGO papers [42][43][44][45][46][47][48][49], foams [50,51], gels [52,53] and as films deposited on desired substrates [54]. The various forms of rGO are then used in wide ranging applications such as solar cells [55], sensors [56,57], supercapacitors [58,59], thin-film conductors [60], membranes [61], water purification [62,63] and biomedical applications [64].…”