一步单模磁微波诱导等离子体制备超窄带隙TiO2
TiO2 with Super Narrow Bandgap Achieved in One-Step Single-Mode Magnetic Microwave Induced Plasma Treatment
摘要：
采用一种简单、新颖的单模磁微波诱导等离子体一步法成功合成了超窄带（1.1 eV~）TiO_2。通过对TiO 2表面Ti 3+的选择性掺杂，使其成为捕获中心，有效地抑制了光激发载流子的复合，实现了可见光催化性能的增强。此外，在一步反应过程中，TiOx的表面化学组成被精确地控制在1.19 < x < 1.92的宽区域内。详细的XPS分析表明，即使在氧化气氛和光催化反应中进行高温处理（~800 oC），形成的Ti 3+表面也显示出高度的热/化学稳定性。
英文摘要：
TiO2 with super narrow bandgap (1.1 eV~) are successfully synthesized via a facile and novel one-step single-mode magnetic microwave induced plasma treatment. The selectively surface Ti3+-doping on obtained TiO2 as trapping centers which significantly restrain the photo-excited carrier recombination and achieve the enhancement of visible-light photocatalytic performance. In addition, the surface chemical composition of TiOx is precisely controlled in a wide region of 1.19 < x < 1.92 during one-step reaction. A detailed XPS analysis reveals that the surface formed Ti3+ shows highly thermal/chemical stability even through high-temperature treatment (~800 oC) in oxidative atmosphere and photocatalytic reaction.
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