TAILIEUCHUNG - Báo cáo hóa học: " Noxious gas detection using carbon nanotubes with Pd nanoparticles"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Noxious gas detection using carbon nanotubes with Pd nanoparticles | Choi et al. Nanoscale Research Letters 2011 6 605 http content 6 1 605 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Noxious gas detection using carbon nanotubes with Pd nanoparticles Hyang Hee Choi1 Junmin Lee1 Ki-Young Dong2 Byeong-Kwon Ju2 and Wooyoung Lee1 Abstract Noxious gas sensors were fabricated using carbon nanotubes CNTs with palladium nanoparticles Pd NPs . An increase in the resistance was observed under ammonia for both CNTs and CNT-Pd sensors. Under carbon monoxide CO the two sensors exhibited different behaviors for CNT sensors their resistance decreased slightly with CO exposure whereas CNT-Pd sensors showed an increase in resistance. The sensing properties and effect of Pd NPs were demonstrated and CNT-Pd sensors with good repeatability and fast responses over a range of concentrations may be used as a simple and effective noxious gas sensor at room temperature. Introduction Carbon nanotubes CNTs have a broad variety of structures that have shown applications as materials for a rapid and innovative change in the field of gas sensing 1 . CNTs have recently been proposed as chemical sensors due to their fast response and high sensitivity toward gaseous molecules. However the chemical and physical interactions between gas molecules and sensing nanotubes are not yet completely understood 2 . Upon exposure to gas molecules the electrical conductance of CNTs changes and the threshold voltage is shifted due to charge transfer between the semiconducting CNTs and electron-donating H2S NH3 CO electron-withdrawing NO2 molecules. Theoretical calculations showed the binding energy of CO and NH3 to carbon nanotubes which indicates a weak charge transfer. The conductivity change may also be caused by contact between the metal electrode and carbon nanotubes and or the contact between carbon nanotubes 3 4 . CNT-based gas sensors offer significant advantages unlike oxide-based sensors such as SiO2 5 and ZnO 6

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