Dissertation
Dissertation > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials

Synthesis and Study of ZnO Nanostructures in Ionic Liquid by Electrochemical Deposition

Author JuMingLiang
Tutor WangEnBo
School Northeast Normal University
Course Inorganic Chemistry
Keywords Zinc oxide Semiconductors Deposition Nanomaterials Photoluminescence
CLC TB383.1
Type Master's thesis
Year 2011
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With the continuous development of nanotechnology, the study on the nanomaterials with different morphologys in the microscopic has attracted wide attention duo to physical and chemical properties that is sensitive to their composition, size and shapes. ZnO is a kind of II-IV semiconductors with wide–band-gap, which has potential applications in the field of optical, electricity, sensor and catalysis. A variety of morphologies of zinc oxide with different properties were synthesized by many methods.In this paper, with the assistance of polyoxometalate (POM), ZnO spindles have been successfully synthesized in ionic liquid by electrochemical deposition. The as-obtained ZnO spindles are composed of small nanoparticles and have a porous structure with a specific surface area of 97.95 m2/g. Parallel experiments were also performed to understand the formation mechanism of the spindle-like ZnO. The experimental results showed that POM played a key role for the formation of the spindle-like ZnO. A possible formation mechanism was also proposed. The photoluminescence spectrum of the ZnO spindles exhibits a strong ultraviolet emission at 390 nm and a very weak visible emission at around 560 nm.On the other hand, a facile template-free solvothermal method was introduced to synthesize olive-like ZnO nanoparticles with an average diameter of about 300 nm and average length of about 600 nm. XRD, TEM, SEM, SAED, EDX and PL spectra were employed to characterize the crystal phase, morphologies, the chemical compositions, and optical properties of the ZnO nanostructure. The experimental results showed the as-obtained ZnO was single–crystalline nanostructure and the concentration of CH3COO- solution played a key role in controlling morphology of ZnO. The growth mechanism of ZnO was tentatively investigated. Besides, the olive-like ZnO nanoparticles exhibit a very strong ultraviolet emission centered at 383 nm and a weak green luminescence emission at around 522 nm.

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