title: Chitosan and chitosan-co-poly(epsilon-caprolactone) grafted multiwalled carbon nanotube transducers for vapor sensing.
abstract: Vapor sensitive transducer films consisting of chitosan grafted (CNT-CS) and chitosan-co-polycaprolactone grafted (CNT-CS-PCL) multiwalled carbon nanotubes were prepared using a spray layer-by-layer technique. The synthesized materials (CNT-CS and CNT-CS-PCL) were characterized by Fourier transform infrared spectroscopy, 13C CP/MAS solid state nuclear magnetic resonance spectroscopy and thermogravimetric analysis. Both CNT-CS and CNT-CS-PCL transducers were analyzed for the response of volatile organic compounds and toluene vapors. The ranking of the relative resistance (A(r)) for both chitosan based transducers were as follows: toluene < chloroform < ethanol < methanol. The CNT transducer (CNT-CS) was correlated selectively with an exponential law to the inverse of Flory-Huggins interaction parameters, chi12. Dosing the films on the interdigitated electrodes with methanol, ethanol, chloroform and toluene vapors increased the film resistance of CNT-CS but decreased the resistance of CNT-CS-PCL compared to that of the reported transducers.
authors.forename: Vijay Kumar
authors.initials: VK
authors.lastname: Rana
authors.forename: Shamim
authors.initials: S
authors.lastname: Akhtar
authors.forename: Sudipta
authors.initials: S
authors.lastname: Chatterjee
authors.forename: Satyendra
authors.initials: S
authors.lastname: Mishra
authors.forename: Raj Pal
authors.initials: RP
authors.lastname: Singh
authors.forename: Chang-Sik
authors.initials: CS
authors.lastname: Ha
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry; D001673:Biodegradation, Environmental; D048271:Chitosan / Q000737:chemistry*; D002725:Chloroform / Q000737:chemistry; D004563:Electrochemistry; D004867:Equipment Design; D000431:Ethanol / Q000737:chemistry; D005740:Gases; D009682:Magnetic Resonance Spectroscopy; D000432:Methanol / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D037742:Nanotubes, Carbon / Q000737:chemistry*; D011091:Polyesters / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D012997:Solvents / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D013818:Thermogravimetry; D013997:Time Factors; D014050:Toluene / Q000737:chemistry; D014159:Transducers
chemical_list: D001672:Biocompatible Materials; D005740:Gases; D037742:Nanotubes, Carbon; D011091:Polyesters; D011108:Polymers; D012997:Solvents; C016240:polycaprolactone; D014050:Toluene; D000431:Ethanol; D002725:Chloroform; D048271:Chitosan; D000432:Methanol