H(2) sensing characteristics of SnO(2) coated single wall carbon nanotube network sensors.
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.
Yang
Myung
M
Department of Materials Science and Engineering and Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul 151-744, Korea.
Kim
Dai-Hong
DH
Kim
Won-Sik
WS
Kang
Tae June
TJ
Lee
Byung Yang
BY
Hong
Seunghun
S
Kim
Yong Hyup
YH
Hong
Seong-Hyeon
SH
D004563:Electrochemistry; D006859:Hydrogen / Q000032:analysis* / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D036103:Nanotechnology / Q000379:methods*; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D056951:Photoelectron Spectroscopy; D013696:Temperature; D017971:Tin Compounds / Q000737:chemistry*
D037742:Nanotubes, Carbon; D017971:Tin Compounds; D006859:Hydrogen; C045358:stannic oxide