Abstract
Two kinds of multiwall carbon nanotubes (MWCNT) networks “Buckypaper” were made by the vacuum filtration method of MWCNT aqueous suspension. The first one was prepared from pure CNT and the second from its oxidized form. The CNT oxidation increase content of oxygen bonded to the surface of CNT. The sensitivity of MWCNT networks to organic solvent vapors (ethanol and heptane) has been investigated by resistance measurements. The solvents had different polarities given by Hansen solubility parameters and nearly the same volume fractions of saturated vapors at the condition of experiment. CNT oxidation significantly increases the sensitivity of CNT resistive sensoric unit to vapors of ethanol and decrease response to heptane vapors.
Highlights
Carbon nanotubes (CNTs) have raised much interest during the recent years due to their inherent extraordinary electrical and mechanical properties
It seems that multiwall carbon nanotubes (MWCNT) are not enough individualized from granules by sonication only, since MWCNT network surface is wrinkled by remaining MWCNT granules, Fig.1A
There are probably still some MWCNT aggregated to submicron aggregates which can be eliminated by centrifugation, Fig. 1C
Summary
Carbon nanotubes (CNTs) have raised much interest during the recent years due to their inherent extraordinary electrical and mechanical properties. Several principles of sensing mechanisms can be employed It goes from the change of intrinsic resistance of individual tubes by exposure to reducing methanol vapors (Li et al, 2007) (here fixed in PMMA matrixes) or in the form of thin polymeric film with percolating CNT network (Philip et al, 2003; Greenshields et al, 2011) or using of electrically conductive network structures made of carbon nanotubes with substantial role of inter-tube contacts (similar to present contend). The present work describes increased sensitivity and achieved selectivity to vapors of ethanol by CNT oxidation in KMnO4/H2SO4 solution
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