Peng Guoxiang, Chou Ni-Ni, Lin Yu-Shan, Yang Cheng-Fu, Meen Teen-Hang
School of Ocean Information Engineering, Jimei University, Xiamen 361021, China.
Department of Chemical and Materials Engineering, National University of Kaohsiung, Kaohsiung 811, Taiwan.
Materials (Basel). 2023 Jun 9;16(12):4275. doi: 10.3390/ma16124275.
In the context of ZnO nanorods (NRs) grown on Si and indium tin oxide (ITO) substrates, this study aimed to compare their degradation effect on methylene blue (MB) at different concentrations. The synthesis process was carried out at a temperature of 100 °C for 3 h. After the synthesis of ZnO NRs, their crystallization was analyzed using X-ray diffraction (XRD) patterns. The XRD patterns and top-view SEM observations demonstrate variations in synthesized ZnO NRs when different substrates were used. Furthermore, cross-sectional observations reveal that ZnO NRs synthesized on an ITO substrate exhibited a slower growth rate compared to those synthesized on a Si substrate. The as-grown ZnO NRs synthesized on the Si and ITO substrates exhibited average diameters of 110 ± 40 nm and 120 ± 32 nm and average lengths of 1210 ± 55 nm and 960 ± 58 nm, respectively. The reasons behind this discrepancy are investigated and discussed. Finally, synthesized ZnO NRs on both substrates were utilized to assess their degradation effect on methylene blue (MB). Photoluminescence spectra and X-ray photoelectron spectroscopy were employed to analyze the quantities of various defects of synthesized ZnO NRs. The effect of MB degradation after 325 nm UV irradiation for different durations can be evaluated using the Beer-Lambert law, specifically by analyzing the 665 nm peak in the transmittance spectrum of MB solutions with different concentrations. Our findings reveal that ZnO NRs synthesized on an ITO substrate exhibited a higher degradation effect on MB, with a rate of 59.5%, compared to NRs synthesized on a Si substrate, which had a rate of 73.7%. The reasons behind this outcome, elucidating the factors contributing to the enhanced degradation effect are discussed and proposed.
在生长于硅（Si）和氧化铟锡（ITO）衬底上的氧化锌纳米棒（NRs）的背景下，本研究旨在比较它们在不同浓度下对亚甲基蓝（MB）的降解效果。合成过程在100℃的温度下进行3小时。在合成氧化锌纳米棒后，使用X射线衍射（XRD）图谱分析其结晶情况。XRD图谱和顶视图扫描电子显微镜（SEM）观察结果表明，当使用不同衬底时，合成的氧化锌纳米棒存在差异。此外，横截面观察显示，在ITO衬底上合成的氧化锌纳米棒与在Si衬底上合成的相比，生长速率较慢。在Si和ITO衬底上生长的氧化锌纳米棒的平均直径分别为110±40纳米和120±32纳米，平均长度分别为1210±55纳米和960±58纳米。对这种差异背后的原因进行了研究和讨论。最后，利用两种衬底上合成的氧化锌纳米棒评估它们对亚甲基蓝（MB）的降解效果。采用光致发光光谱和X射线光电子能谱分析合成的氧化锌纳米棒各种缺陷的数量。通过比尔 - 朗伯定律，具体分析不同浓度MB溶液透射光谱中的665纳米峰，可以评估325纳米紫外线照射不同时长后MB的降解效果。我们的研究结果表明，在ITO衬底上合成的氧化锌纳米棒对MB的降解效果更高，降解率为59.5%，而在Si衬底上合成的纳米棒降解率为73.7%。讨论并提出了导致这一结果的原因，阐明了促成增强降解效果的因素。
