氮掺杂空心TiO_2纳米粒子的制备与研究

Preparation and study of N-doped hollow TiO_2 nanoparticles

采用一种简便的方法合成了氮掺杂空心TiO2纳米粒子。以聚苯乙烯(PS)纳米粒子为模板、氨水为催化剂、三乙醇胺为抑制剂,采用溶胶-凝胶方法合成了PS/TiO2(核/壳)纳米复合粒子。考察了氨水、三乙醇胺和钛酸正丁酯用量对TiO2壳层表面形态和厚度的影响。氨水用量3.00g时TiO2壳层表面较光滑,氨水用量6.00g时其表面变得粗糙;三乙醇胺用量0.10g时TiO2壳层表面较粗糙,三乙醇胺用量0.20g时其表面变得光滑;钛酸正丁酯1.00和3.00g时,TiO2壳层厚度为25和43nm。研究中三乙醇胺同时又作为氮掺杂剂,通过煅烧得到了氮掺杂空心TiO2纳米粒子,它对可见光具有光响应。

The N-doped hollow TiO2 nanoparticles were prepared by a simple method.The PS nanoparticles,ammonia and triethanolamine were used as templates,catalyst and inhibitor,respectively,the PS/TiO2（core/shell） nanocomposite particles were synthesized by sol-gel process.The effect of the amounts of ammonia,triethanolamine and tetrabutyl titanate on surface morphology and thickness of TiO2 shell were investigated,respectively.The surface of TiO2 shell at ammonia amounts of 6.00g was rougher than that of TiO2 shell at ammonia amounts of 3.00g.The surface of TiO2 shell under triethanolamine amounts of 0.20g was smoother than that of TiO2 shell under ammonia amounts of 0.10g.The thicknesses of TiO2 shell were 25 and 43nm when amounts of tetrabutyl titanate were 1.00 and 3.00g,respectively.In this study,the triethanolamine was again used as N resource to prepare N-doped hollow TiO2 nanoparticles through cacination process of the PS/TiO2 nanocomposite particles,and it had visible light response.