KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Settings

Author: search.filters.author.Chongsri, KrisanaSubject: search.filters.subject.Hydrothermal process

Search Results

Now showing 1 - 4 of 4
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Investigation on influence of seeding layer on morphological properties of ZnO-based nanostructure prepared by hydrothermal process
    (2018-01-01)
    Chongsri, Krisana
    ;
    Boonyarattanakalin, Kanokthip
    ;
    Pecharapa, Wisanu
    In this present work, bare ZnO low-dimensional structures were synthesized by hydrothermal process with crystal growth assistance using seed layers. Different seeding layer species including ZnO and Ga-doped ZnO films prepared by sol-gel dip coating were introduced onto the substrate before the hydrothermal growth of ZnO-based nanostructures. Zn(NO<inf>3</inf>)<inf>2</inf> and GaN<inf>3</inf>O<inf>9</inf> were utilized as Zn and Ga source during hydrothermal process. The influence of seeding layer types on morphological and shapes of the hydrothermally grown nanostructures have been extensively scrutinized by Field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD) and optical spectroscopy. It was revealed that different morphologies and exceptional shapes in form of nanorods of ZnO-based nanostructures were obtained as different seeding layers were introduced. More detailed studies for clarification of seed layer effect on the growth of ZnO-based nanostructures are mentioned and discussed.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Effect of F incorporation on physical and optical properties of hydrothermally grown ZnO nanorods
    (2018-01-01)
    Sinornate, Wuttichai
    ;
    Chongsri, Krisana
    ;
    Boonyarattanakalin, Kanokthip
    ;
    Pecharapa, Wisanu
    F-doped ZnO nanorods were synthesized via hydrothermal process with variation of Fluorine doping contents (0-10%) starting from zinc oxide thin film as a seeding layer for nanorod growth. The zinc oxide seeding thin film was prepared by sol-gel spin coating at 2000 rpm on glass substrate using zinc acetate precursor with annealing at 500°C in air for 2 h. Ammonium fluoride (NH<inf>4</inf>F) was used as F doping precursor. The properties of F-doped ZnO nanorods were characterized by field emission electron microscope (FESEM), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX) and UV-Visible spectrophotometer. Corresponding results indicated that growth of ZnO:F nanorods with good crystallinity and grown in (002) plane in undoped ZnO and F-doped ZnO 5%. The average size diameter of undoped and F-doped ZnO nanorods at 3%, 5% and 10% are 56, 96, 70 and 103 nm, respectively. From cross section images the average length of undoped and F-doped ZnO nanorods at 3%, 5% and 10% are 400, 375, 199 and 478 nm, respectively. The transmittance spectra shows moderate transparency (<80%) of the ZnO nanorod film in visible region with corresponding band gap range of 3.25-3.28 eV.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Growth and characterization of Ga/F co-doped ZnO nanorods/nanodisks via hydrothermal process
    (2016-12-01)
    Chongsri, Krisana
    ;
    Sinornate, Wuttichai
    ;
    Boonyarattanakalin, Kanokthip
    ;
    Pecharapa, Wisanu
    Ga/F co-doped ZnO nanorods/nanodisks (GFZO) were synthesized using a hydrothermal process by varying the Ga doping levels (1-5 wt.%) and F doping levels (1-5 wt.%). Zinc nitrate, gallium nitrate hydrate and ammonium fluoride were chosen as starting precursors for Zn, Ga and F sources, respectively. The nanorod growth was initiated by zinc oxide seeding film fabricated by spin coating on glass substrate using zinc acetate precursor and annealed at 500°C for 2 h. Effect of different dopant concentrations on morphologies, structural, and optical properties of the samples were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM) and photoluminescence spectroscopy (PL), respectively. The results of Ga/F codoped ZnO (GFZO) were compared to the single doped specimens including Ga:ZnO (GZO) and F:ZnO (FZO) samples, and bare ZnO sample. The results suggest that content of either Ga or F dopant has high influence on relevant properties of as-synthesized nanorods/nanodisks.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Hydrothermal synthesis and characterization of ZnO:F nanorod structure
    (2016-01-01)
    Sinornate, Wuttichai
    ;
    Chongsri, Krisana
    ;
    Pecharapa, Wisanu
    F-doped ZnO nanorod structures were synthesized via hydrothermal process with variation of doping content starting from zinc nitrate solution and zinc oxide thin film used as seeding layer. The zinc oxide seeding film was fabricated by spin coating on glass substrate using zinc acetate precursor and annealed at 500 °C for 2 h. Relevant properties of ZnO:F nanorod structures were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX) and UV-VIS spectrophotometer. Corresponding results indicated that ZnO:F nanorod array, grown in (002) plane, has the characteristics of good crystallinity. In addition, this study showed that ZnO:F nanorod with exceptional structure can be obtained by hydrothermal process, operated at proper treatment time, temperature and F-doping content.