Synthesis and Gas Sensing Properties of Urchin-Like CuO Self-Assembled by Nanorods through a Poly(ethylene glycol)-Assisted Hydrothermal Process

摘要: Urchin-like CuO, consisting of closely packed nanorods with a diameter 10nm, have been successfully synthesized by poly(ethylene glycol) (PEG)-assisted hydrothermal route at low temperature 100°C. The as-obtained CuO were thoroughly characterized X-ray diffraction (XRD) study, Field emission scanning electron microscope (FESEM), High-resolution transmission microscopy (HRTEM) and Gas sensor measurements. From the XRD pattern, all peaks detected can be assigned to in monoclinic structure lattice parameters a=4.662, b=3.416 c=5.118 (JCPDS card no. 65-2309). FESEM TEM showed that urchin-like sphere is about 1µm. Further investigation formation mechanism reveals PEG-assisted process vital 3D structures. Besides template function, PEG often plays as reductant while reacting Cu(+2). In our case, no impurity Cu2O observed implying did not reduce Cu(+2) Cu(+1). We attribute this high concentration PEG. based on nanostructures exhibit excellent ethanol-sensing properties reduced working (200°C), which shows sensitivity two times higher than particles(about 100nm, made from calcinations Cu(NO3)2 400°C). enhancement as-prepared may contributed fancy nanostructures.