Abstract
Single-walled c arbon nanotube composite films were prepared on quartz crystal microbalance by selfassembly process, and their properties to relative humidity ranging from 20.9% to 80.2% were studied at room temperature. The treated SWNTs were characterized by Fourier trans form infr ared spectroscopy and X-ray photoelectron spectroscopy. Two kinds of SWNT sensors were fabricated using original SWNTs and carboxyl modified SWNTs as humidity sensitive material, respectively. The results showed that the sensitivity of the PDDA/SWNT-COOH humidity sensor was 20.23% higher than the PDDA/SWNT sensor. In contrast, the latter had a superior recovery property and the recovery time was 64 s, while that of the PDDA/SWNT-COOH sensor was 84 s. Both sensors had good repeatability and stability.
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