Electrical and humidity sensing properties of carbon nanotubes-SiO2-poly(2-acrylamido-2-methylpropane sulfonate) composite material

Humidity sensing properties of reduced humic acid

“…It is clear that the effect of the frequency is more significant at lower RH than higher RH. This behavior has been also reported by Su et al [19] in the case of carbon nanotubes, the author attributed this behavior to the effect of the high frequency on the polarization of the adsorbed water molecules. As shown in the figure, the impedance of the reduced humic acid nanosheets sensor significantly decreases as the relative humidity increases.…”

Humidity Sensing Properties of Chitosan by Using Quartz Crystal Microbalance Method

“…Therefore, reliable, cheap, and highly sensitive humidity detectors are necessary. There are many types of humidity sensors based on ceramic, 4 carbon based materials, [5][6][7] polymeric, [8][9][10][11] and composite materials. 12 Ceramic sensors need an integrated heater to recover their humidity-sensitive characteristics, while polymeric sensors do not need a heating process, but they have been found to be less sensitive.…”

Multi-walled carbon nanotubes–cellulose paper for a chemical vapor sensor

“…Due to possible improvement of electrical characteristics of polymer via the homogeneous distribution of CNTs, many researchers have investigated various reactions for covalently grafting of CNTs to polymer [5][6][7][8]. Recently, CNT-polymer composites have been widely utilized as functional materials for organic transistor devices [9], gas sensors [10,11], bio-sensors [12] and chemical vapor sensors [13][14][15]. Regarding sensor applications, a lot of functionalities have been given to CNT-polymer composites for quantitative, selective and sensitive detection of analytes molecules.…”