研究目的
To synthesize flower-like ZnO nanorods on glass substrates using a simple, low-temperature hydrothermal method without catalysts, templates, or buffer layers, and to characterize their structural, morphological, and optical properties.
研究成果
Flower-like ZnO nanorods with hexagonal wurtzite structure were successfully synthesized using a simple hydrothermal method without catalysts. The films exhibit high surface roughness and a direct band gap of 3.3 eV, with good optical transmittance in the visible region. The UV and visible photoluminescence emissions indicate good crystalline quality with some defects. This method is low-cost and effective for potential applications in sensors and optoelectronic devices.
研究不足
The method may not be scalable for large-area applications; only 0.1 M concentration yielded homogeneous growth, lower concentrations did not. The synthesis requires specific pH control and temperature conditions, which might limit reproducibility. No comparison with other synthesis methods or long-term stability tests were conducted.
1：Experimental Design and Method Selection:
A one-step hydrothermal method was employed at low temperature (110 °C) to grow flower-like ZnO nanorods without catalysts, templates, or buffer layers. The method involves chemical reactions using zinc nitrate hexahydrate, hexamethylenetetramine (HMT), and NaOH as precursors.
2：Sample Selection and Data Sources:
Glass substrates were used, cleaned with ethanol and acetone in an ultrasound bath. Precursor solutions of 0.1 M concentration were prepared and stirred for homogenization.
3：1 M concentration were prepared and stirred for homogenization.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes an autoclave (glass bottle, 120 ml, capable of 140 °C), ultrasound bath, oven, field emission scanning electron microscope (FE-SEM), X-ray diffractometer (XRD), atomic force microscope (AFM), UV-Visible spectrophotometer, and photoluminescence spectroscopy (PL) setup with a He-Cd laser (360 nm, 25 mW). Materials include Zn(NO3)2·6H2O, HMT, NaOH, NH3, distilled water, ethanol, acetone, and glass substrates.
4：Experimental Procedures and Operational Workflow:
Dissolve precursors in distilled water to make 0.1 M solution, stir for 30 min, add NH3 dropwise to adjust pH to 10.7, transfer to autoclave, immerse cleaned glass substrates, heat hydrothermally at 110 °C for 3.5 h, cool to room temperature, wash with distilled water, dry at 50 °C for 30 min. Characterize using FE-SEM, XRD, AFM, UV-Vis, and PL.
5：1 M solution, stir for 30 min, add NH3 dropwise to adjust pH to 7, transfer to autoclave, immerse cleaned glass substrates, heat hydrothermally at 110 °C for 5 h, cool to room temperature, wash with distilled water, dry at 50 °C for 30 min. Characterize using FE-SEM, XRD, AFM, UV-Vis, and PL.
Data Analysis Methods:
5. Data Analysis Methods: XRD data analyzed using Bragg's law to determine lattice constants. Optical band gap calculated from (αhν)^2 vs. hν plot. Morphology and roughness assessed from FE-SEM and AFM images. PL spectra analyzed for emission peaks.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
