The effect of hydrothermal reaction time on the structural, optical, and catalytic properties was investigated for the tin oxide (SnO₂) nanoparticles synthesized by employing a surfactant-free hydrothermal process. The formation of pure SnO₂ nanoparticles having tetragonal rutile structures was confirmed from the structural analysis using X-ray diffraction. The existence of direct relation between crystallinity and hydrothermal reaction time was evidenced from the observed higher crystallinity and larger crystalline size for the nanoparticles synthesized at longer hydrothermal reaction time. The morphological investigation using SEM analysis showed nanoparticles with nearly spherical shaped morphology with agglomeration. The optical analysis using UV–visible absorption spectra indicated slight blue shift in optical band gap energy values. Reduction in the intensity of visible emission PL band for the sample synthesized at longer hydrothermal reaction time further confirmed the formation of higher crystalline samples. H₂O₂-assisted catalytic degradation of crystal violet dye carried out under ambient conditions showed a maximum degradation efficiency for the sample synthesized at longer hydrothermal reaction time.

研究了水热反应时间对通过无表面活性剂水热法合成的氧化锡 (SnO ₂ ) 纳米颗粒的结构、光学和催化性能的影响。纯SnO ₂的形成具有四方金红石结构的纳米颗粒通过使用X射线衍射的结构分析得到证实。结晶度和水热反应时间之间存在直接关系的证据是，在较长的水热反应时间下合成的纳米颗粒具有更高的结晶度和更大的晶体尺寸。使用 SEM 分析的形态研究表明纳米颗粒具有近乎球形的形态并附聚。使用紫外-可见吸收光谱的光学分析表明光学带隙能量值有轻微的蓝移。在较长的水热反应时间合成的样品的可见光发射 PL 带强度的降低进一步证实了更高结晶样品的形成。H ₂ O ₂在环境条件下进行的结晶紫染料的辅助催化降解显示出在较长水热反应时间合成的样品的最大降解效率。