Facile synthesis of ZnO nanostructures and investigation of structural and optical properties

Journal Article · Sun Dec 15 04:00:00 EST 2013 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2013.10.008· OSTI ID:22288710

Tripathi, Neeti; Rath, Shyama

ZnO nanostructures were synthesized by chemical bath deposition method, using zinc nitrate [Zn(NO{sub 3}){sub 2}] and hexa-methylene-tetra-amine [(HMT),C(H{sub 2}){sub 6}N{sub 4}] as precursors. Controlled size and shape evolution of ZnO nanostructures were achieved by changing the HMT concentration from 0.025 M to 0.1 M, whereas Zn(NO{sub 3}){sub 2} concentration kept constant. X-ray diffraction (XRD) and Raman study confirmed the formation of single crystalline, hexagonal wurtzite ZnO structure. Sharp peaks in Raman spectra, corresponding to E{sub 2}(low) and E{sub 2}(high) referred to wurtzite structure with higher order of crystallinity. Transmission electron microscopy (TEM) revealed that the shape and size of the nanostructures reduced, with increasing concentration of HMT. Further, effect of structure's size was observed in the band gap (shift). Photoluminescence study showed two peaks at ∼ 380 nm and ∼ 540 nm corresponding to the band to band transition and defect transitions. Modifications of properties are explained in detail on the basis of shape and size change of the structures and possible mechanism is discussed. - Highlights: • ZnO nanostructures were synthesized by chemical bath deposition method. • Particle’s shape and sizes were controlled by varying the HMT concentrations. • Effect of particle’s sizes was observed in the band gap (shift) and photoluminescence. • HMT is an effective suppressor of ZnO directional growth. • Shape evolution of ZnO particles can be tailored by varying the HMT concentrations.

• OSTI ID: 22288710
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Vol. 86; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AMINES
CONCENTRATION RATIO
DEPOSITION
MONOCRYSTALS
NANOSTRUCTURES
OPTICAL PROPERTIES
PARTICLES
PHOTOLUMINESCENCE
RAMAN SPECTRA
SYNTHESIS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
ZINC NITRATES
ZINC OXIDES