title: One-dimensional carbon nanotube/SnO2/noble metal nanoparticle hybrid nanostructure: synthesis, characterization, and electrochemical sensing.
abstract: Herein we report a facile and efficient method for self-assembling noble-metal nanoparticles (NPs) to the surface of SnO(2)-coated carbon nanotubes (CNT@SnO(2)) to construct CNT@SnO(2)/noble metal NP hybrids. By using SnCl(4) as the precursor of the SnO(2) shell on the surface of CNTs, the hydrolysis speed of SnCl(4) was slowed down in ethanol containing a trace amount of urea and water. The coaxial nanostructure of CNT@SnO(2) was confirmed by using X-ray powder diffraction (XRD) and transmission electron microscopy (TEM). It was found that the coating layer of SnO(2) was homogeneous with the mean thickness of 8 nm. The CNT@SnO(2)/noble-metal NP hybrids were obtained by mixing noble-metal NPs with as-prepared CNT@SnO(2) coaxial nanocables by means of a self-assembly strategy. With the amino group terminated, the CNT@SnO(2) coaxial nanocable can readily adsorb the as-prepared noble-metal NPs (Au, Ag, Au-Pt, and Au-Pd NPs). The presence of an amino group at the surface of SnO(2) was proved by use of X-ray photoelectron spectroscopy (XPS). In addition, H(2)O(2) sensing by amperometric methods could serve as detection models for investigating the electrocatalytic ability of as-prepared hybrid materials. It was found that wide linear ranges and low detection limits were obtained by using the enzyme-free CNT@SnO(2)@Au-Pt modified electrode, which indicated the potential utilizations of the hybrid based on CNT@SnO(2) for electrochemical sensing.
authors.affiliation: State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China.
authors.forename: Youxing
authors.initials: Y
authors.lastname: Fang
authors.forename: Shaojun
authors.initials: S
authors.lastname: Guo
authors.forename: Chengzhou
authors.initials: C
authors.lastname: Zhu
authors.forename: Shaojun
authors.initials: S
authors.lastname: Dong
authors.forename: Erkang
authors.initials: E
authors.lastname: Wang