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[交流] 二氧化钛纳米线

如题，现在尝试合成二氧化钛纳米线文献方案如下：The TiO2 nanowires (TiO2NWs) were synthesized by a modified hydrothermal growth method according to the literature (Nikhil et al., 2014). Briefly, 2 g of TiO2 nanoparticles mixed with 35 mL of 15 M NaOH aqueous solution was transferred into a Teflon-lined digestion vessel and heated to 170 °C for 48 h, and then cooled down to room temperature. The supernatant was gently removed from the product formed at the bottom of the Teflon vessel. After the white products were soaked in 0.1 M HCl solution for 4 h, the solution was washed several times with DI water until it became neutral. Finally the wet white products were dried under vacuum at 100 °C for 4 h to obtain the dry solid of TiO2NWs. 出现的问题是，在反应釜上层形成了一层白色絮状物，底部沉积很厚一层白色块状物。想请教有经验的前辈们，二氧化钛纳米线在反应釜煅烧后形成的应该是在底部沉积物还是絮状物？会不会是二氧化钛浓度太大，才在底部沉积成块状的？

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