title: Arrayed CNT-Ni nanocomposites grown directly on Si substrate for amperometric detection of ethanol.
abstract: A novel amperometric biosensor utilizing carbon nanotube (CNT)-Ni nanoparticle hybrid arrays for ethanol detection has been developed. The sensor was fabricated by e-beam deposition of thin Ni film on arrayed multi-walled carbon nanotubes grown directly on Si substrate. As the Ni film thickness is ≤ 200nm, high-resolution SEM and TEM images showed well-dispersed and strongly adhered crystalline Ni nanoparticles uniformly populated on the sidewalls of CNTs, and the sensitivity of the resultant CNT-Ni sensor generally increased with increasing nickel thickness. The best sensor showed a wide response range of 50-600 μM, a response time of <10s, and a sensitivity of 14.81 μA μM(-1)cm(-2) which is ∼380% higher in comparison with the nanostructured Ni/Pt/Ti electrodes.
authors.affiliation: Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan.
authors.forename: Yan-Shi
authors.initials: YS
authors.lastname: Chen
authors.forename: Jin-Hua
authors.initials: JH
authors.lastname: Huang
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation*; D003217:Conductometry / Q000295:instrumentation*; D003460:Crystallization / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D000431:Ethanol / Q000032:analysis*; D036103:Nanotechnology / Q000295:instrumentation*; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D009532:Nickel / Q000737:chemistry*; D012825:Silicon / Q000737:chemistry*
chemical_list: D037742:Nanotubes, Carbon; D000431:Ethanol; D009532:Nickel; D012825:Silicon