This study investigated the low-humidity sensing performance of raw multi-walled nanotubes (MWCNTs), oxidized MWCNTs (MWCNT-COOH) and Pd-modified MWCNT-COOH (Pd-MWCNT-COOH) thin films by using a quartz crystal microbalance (QCM). The characteristics of the thin films were analyzed by scanning electron microscopy (SEM) and atomic force microscopy (AFM). Water vapor molecules adsorbed onto the Pd-MWCNT-COOH thin film had a larger frequency shift than raw MWCNTs and MWCNT-COOH thin films. Adsorption dynamic analysis, molecular mechanics calculation (association constant), was applied to elucidate how surface modification and functionalization of MWCNTs increase the sensitivity to low-humidity. (c) 2008 Elsevier B.V. All rights reserved.
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Sensors and Actuators B: Chemical
Volume 135, Issue 2,Pages 506–511
