Abstract
SnO2 nanoparticle coated single wall nanotube (SWNT) network sensorswere fabricated by forming a SWNT network on the Pt patternedSiO2/Si substrate using a dip coating method and subsequently depositingSnO2 nanoparticles on the SWNT network by rf magnetron sputtering. TheirH2 gas sensing properties were investigated. TheSnO2–SWNT network sensors stably and reversibly responded toH2 gas even at room temperature and could detectH2 gas down to 100 ppm. In addition to the low temperature detection,a remarkable finding was that the gas sensing behavior ofSnO2–SWNT network sensors was changed from p-type to n-type with increasingSnO2 deposition time(i.e. surface coverage of SnO2 on SWNT). A schematic model was proposed to explain theswitching of sensing behavior depending on the surface coverage ofSnO2 nanoparticles on the SWNTs.
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