| 초록 |
In this work, we firsly report the ultra-sensitive platforms by fabricating Pt loaded thin-layered SnO2 nanosheets based sensing layers on Ag nanowires embedded glass-fabric reinforced vinly-phenyl siloxane hybrid composite substrate (AgNW-GFRVPH film) as a heater. The Pt-functionalized polycrystalline SnO2 nanosheets were synthesized by pyrolysis of Sn precursor coated graphene oxide template followed by subsequent metal-mirror reaction. The fabricated sensing layers exhibited high mechanical flexibility and superior response (Rair/Rgas = 4.8 @ 1 ppm dimethyl sulfide) against 5 other interfering molecules, i.e., carbon monoxide, ethanol, ammonia, toluene, and hydrogen sulfide. The superiority of the sensing layers stemms from high surface area, high porosity, and effective modulation in electron depletion region of ultra-thin Pt-functionalized SnO2 nanosheets. In particular, thermally stable AgNW-GFRVPH film based heater is fabricated by free radical polymerization of vinly group in vinly-phenyl oligosiloxane (VPO) and phenyltris(dimethylvinlysiloxy)silane (PTV) with Ag NWs and glass-fabric, exhibiting superior heat generation (~200 oC), high dimensional stability (13 ppm oC-1), good thermal stability (~350 oC), and high optical transparency (~90%). As a result, graphene oxide templated Pt-sensitized SnO2 nanosheets combined with highly stable AgNW-GFRVPH film heater exhibited the best sensing performance among all the state-of-the-art works regarding flexible chemiresistors, presenting a new perspective of flexible chemiresistors beyond the current studies in this field. |
