H₂sensing characteristics of SnO₂coated single wall carbon nanotube network sensors

Abstract

SnO(2) nanoparticle coated single wall nanotube (SWNT) network sensors were fabricated by forming a SWNT network on the Pt patterned SiO(2)/Si substrate using a dip coating method and subsequently depositing SnO(2) nanoparticles on the SWNT network by rf magnetron sputtering. Their H(2) gas sensing properties were investigated. The SnO(2)-SWNT network sensors stably and reversibly responded to H(2) gas even at room temperature and could detect H(2) gas down to 100 ppm. In addition to the low temperature detection, a remarkable finding was that the gas sensing behavior of SnO(2)-SWNT network sensors was changed from p-type to n-type with increasing SnO(2) deposition time (i.e. surface coverage of SnO(2) on SWNT). A schematic model was proposed to explain the switching of sensing behavior depending on the surface coverage of SnO(2) nanoparticles on the SWNTs.

DMMP gas sensing behavior of ZnO-coated single-wall carbon nanotube network sensors

“…Consequently, the DMMP sensing behavior was changed from p-type to n-type with ZnO deposition time. Similar observation has been found in SnO 2 nanoparticle-coated SWNT network sensor toward H 2 gas [15]. To confirm the type change, Hall measurement was performed in Van der Pauw configuration (Ecopia21, Model: HMS-3000).…”

Nanostructured Materials for Room‐Temperature Gas Sensors

“…Many studies have demonstrated that more abundant metal oxides can be good candidates for replacing noble metals in designing sensor materials. Both n‐type (SnO 2 , TiO 2 , ZnO, and WO 3 ) and p‐type metal oxides (Co 3 O 4 and CuO) have been shown to contribute to the room‐temperature sensing abilities of CNTs, while SnO 2 seems to be the most investigated material.…”

Electrical Characteristics of Ni-CNT-SiO2-SiC Structured 4H-SiC MIS Capacitors

“…[1][2][3] High temperature gas-sensing devices require effective gate contact structures for sensitivity of devices. 4 5 We then focus on carbon nanotubes (CNTs) due to their properties.…”