Study on the preparation and optoelectronic properties of nano-ZnO arrays

ABSTRACT

Nano-ZnO arrays with high degree of orientation and good dispersion were prepared by sol-gel method and hydrothermal method. The morphology, structure and photoluminescence properties of samples were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) and fluorescence spectrometer. The results showed that the prepared samples are hexagonal wurtzite structure and the growth of the (002) crystal surface is preferred. The samples have a strong characteristic absorption and UV absorption capacity at 371.5 nm, and there is a high UV emission peak at 387 nm, besides, there is a relatively weak blue emission peak at 468 nm. Moreover, The field emission characteristics tests of samples were conducted and revealed the low turn-on field is 1 V/μm, in addition,the field emission current density is 210 μA/cm² under the condition of electric field of 7.5 V/μm. Finally, field emission mechanism of nano-ZnO array is discussed.

Keywords:

• Nano-ZnO arrays
• sol-gel method
• hydro-thermal method
• photoluminescence
• field emission

Additional information

Funding

This work is supported by National Natural Science Foundation of China(61664008), the PH.D Start-up Foundation of Yan'an University (No.YD 2016-02), the 2016 Local University National Training Project of Innovation and Entrepreneurship for Undergraduates (No.1559、1569), the 2017 Yan'an University Training Project of Innovation and Entrepreneurship for Graduate students (YCX201740), the 2016 Yan'an University Training Project of Innovation and Entrepreneurship for Undergraduates(D2016109) and the Special Research Funds for Discipline Construction of High Level University Construction(No.2015SXTS02).