Preparation and characteristics of conducting polymer-coated multiwalled carbon nanotubes for a gas sensor

Abstract

Conducting polymer-coated multiwalled carbon nanotubes (MWCNTs) were prepared by template polymerization in order to enhance their gas sensitivity. This investigation of the conducting polymer phases that formed on the surface of the MWCNTs is based on field-emission scanning electron microscopy images. The thermal stability of the conducting polymer-coated MWCNTs was significantly improved by the high thermal stability of MWCNTs. The synergistic effects of the conducting polymer-coated MWCNTs improve the gas-sensing properties. MWCNTs coated with polyaniline uniformly show outstanding improvement in gas sensitivity to NH 3 due to the synergistic combination of efficient adsorption of NH 3 gas and variation in the conduction of electrons.

Improvement of Thermal Conductivity of Poly(dimethyl siloxane) Composites Filled with Boron Nitride and Carbon Nanotubes

“…The most widely used thermally conductive fillers such as aluminum, diamond, copper, multi-walled carbon nanotubes (MWCNTs), and graphite have thermal conductivity of about 247, 2000, 398, 3000, and 25-470 W/m·K, respectively. [2][3][4][5][6] Many researchers have demonstrated the enhancement in the thermal conductivity of polymer composites filled with various thermally conductive fillers. Some representative examples are as follows.…”

Selective and Sensitive Room Temperature Detection of Ammonia by PPy-Ag Nanocomposite

“…Response time is the time taken for the sensor to attain 90% of the maximum change in resistance on exposure to test gas. Recovery time is the time taken by the sensor to get back 90% of the original resistance after degassing [17]. …”

Synthesis of a Co3O4@gold/MWCNT/polypyrrole hybrid composite for DMMP detection in chemical sensors

“…The oxidation of multiwall carbon nanotubes (MWCNTs) was synthesized according to the reported procedure. 21 The calculated amount of 2 g of MWCNTs was dispersed in 100 ml of concentrated H 2 SO 4 and HNO 3 with a volume ratio of 3 : 1 using an ultrasonicator for 1 h. The reaction mixture was heated at 90 C for 7 h, and washed with water several times, until becoming a neutral pH ¼ 7. The resultant product of functionalized MWCNTs was ltered by using a 0.2 mm PTFE membrane lter, and dried in vacuum at 80 C for 24 h.…”