Synthesis and gas sensing properties of urchin-like CuO self-assembled by nanorods through a poly(ethylene glycol)-assisted hydrothermal process

Jiang Ying Li*, Baojuan Xi, Jun Pan, Yitai Qian

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations

Abstract

Urchin-like CuO, consisting of closely packed nanorods with a diameter of 10nm, have been successfully synthesized by a poly(ethylene glycol) (PEG)-assisted hydrothermal route at low temperature of 100°C. The as-obtained Urchin-like CuO were thoroughly characterized by X-ray diffraction (XRD) study, Field emission scanning electron microscope (FESEM), High-resolution transmission electron microscopy (HRTEM) and Gas sensor measurements. From the XRD pattern, all the peaks detected can be assigned to CuO in a monoclinic structure with lattice parameters a=4.662, b=3.416 and c=5.118 (JCPDS card no. 65-2309). The FESEM and TEM showed that the diameter of the urchin-like CuO sphere is about lm. Further investigation of the formation mechanism reveals that the PEG-assisted hydrothermal process is vital to the formation of 3D structures. Besides the template function, PEG often plays as a reductant while reacting with Cu(+2). In our case, no impurity peaks of CU 2O were observed in the XRD pattern, implying that PEG did not reduce Cu(+2) to Cu(+1). We attribute this to the high concentration of PEG. The sensor based on the urchin-like CuO nanostructures exhibit excellent ethanol-sensing properties at reduced working temperature (200°C), which shows a sensitivity two times higher than that of CuO particles(about 100nm made from calcinations of Cu(NO3)2 at 400°C). The enhancement in sensitivity of the as-prepared CuO may be contributed to the fancy 3D nanostructures.

Original languageEnglish (US)
Title of host publicationMulti-Functional Materials and Structures II
Pages1059-1062
Number of pages4
DOIs
StatePublished - Dec 1 2009
Event2nd International Conference on Multi-Functional Materials and Structures, MFMS-2009 - Qingdao, China
Duration: Oct 9 2009Oct 12 2009

Publication series

NameAdvanced Materials Research
Volume79-82
ISSN (Print)1022-6680

Other

Other2nd International Conference on Multi-Functional Materials and Structures, MFMS-2009
CountryChina
CityQingdao
Period10/9/0910/12/09

Keywords

  • Cuo
  • Ethanol sensor
  • Hydrothermal
  • Poly(ethylene glycol)
  • Self-Assembled
  • Urchin-like

ASJC Scopus subject areas

  • Engineering(all)

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