In situ high temperature XRD studies of ZnO nanopowder prepared via cost effective ultrasonic mist chemical vapour deposition

Bulletin of materials science

R N Goyal¹  Ashish Pandey¹  Ashvani Kumar²  Davinder Kaur²  Preetam Singh²  Ajay Kaushal² 

[1] Department of Chemistry and Centre of Nanotechnology, Indian Institute of Technology Roorkee, Roorkee 247 667, India$$Department of Chemistry and Centre of Nanotechnology, Indian Institute of Technology Roorkee, Roorkee 247 667, IndiaDepartment of Chemistry and Centre of Nanotechnology, Indian Institute of Technology Roorkee, Roorkee 247 667, India$$;Department of Physics and Centre of Nanotechnology, Indian Institute of Technology Roorkee, Roorkee 247 667, India$$Department of Physics and Centre of Nanotechnology, Indian Institute of Technology Roorkee, Roorkee 247 667, IndiaDepartment of Physics and Centre of Nanotechnology, Indian Institute of Technology Roorkee, Roorkee 247 667, India$$

关键词: High temperature XRD;    ZnO nanopowder;    ultrasonic mist chemical vapour deposition.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Ultrasonic mist chemical vapour deposition (UM�?�CVD) system has been developed to prepare ZnO nanopowder. This is a promising method for large area deposition at low temperature inspite of being simple, inexpensive and safe. The particle size, lattice parameters and crystal structure of ZnO nanopowder are characterized by in situ high temperature X-ray diffraction (XRD). Surface morphology of powder was studied using transmission electron microscopy (TEM) and field emission electron microscope (FESEM). The optical properties are observed using UV-visible spectrophotometer. The influence of high temperature vacuum annealing on XRD pattern is systematically studied. Results of high temperature XRD showed prominent 100, 002 and 101 reflections among which 101 is of highest intensity. With increase in temperature, a systematic shift in peak positions towards lower 2𝜃 values has been observed, which may be due to change in lattice parameters. Temperature dependence of lattice constants under vacuum shows linear increase in their values. Diffraction patterns obtained from TEM are also in agreement with the XRD data. The synthesized powder exhibited the estimated direct bandgap (𝐸_g) of 3.43 eV. The optical bandgap calculated from Tauc’s relation and the bandgap calculated from the particle size inferred from XRD were in agreement with each other.

【 授权许可】

Unknown