二氧化钛纳米晶的可控合成及光还原活性研究
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- 英文论文题名：Synthesis and photoreductive activity of TiO_2 nanocrystals
- 论文作者：王文寿
- 英文论文作者：Wenshou Wang ; National Engineering Research Center for Colloidal Materials ; Shandong University
- 年：2016
- 作者机构：山东大学国家胶体材料工程技术研究中心;
- 论文关键词：TiO_2纳米晶 ; 光还原活性 ; 可逆光致变色体系
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第三十六分会：纳米材料合成与组装
- 语种：中文
- 分类号：O614.411;TB383.1
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十六分会 ; 纳米材料合成与组装
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：321k
- 原文格式：D
- 会议级别：全国
摘要
利用TiO_2纳米晶光还原活性光催化驱动氧化还原类染料产生颜色变化构建可逆光致变色体系,为设计和制备性能优异的可逆光致变色体系提供了新思路。然而传统TiO_2价带空穴氧化活性远高于导带电子还原活性,在紫外光作用下氧化降解染料,因此赋予TiO_2光还原活性、抑制其光氧化活性是实现TiO_2/氧化还原类染料可逆光致变色体系的关键。本文以胶体纳米晶热注入法合成法为基础,发展了羟基功能团修饰及钡离子掺杂引入氧空位等新方法,可控制备了具有光还原活性的TiO_2纳米晶。羟基功能团或钡离子掺杂引入的氧空位可以有效俘获光生空穴,赋予TiO_2纳米晶光还原活性,从而成功制备了TiO_2纳米晶/氧化还原类染料可逆光致变色体系。
Construction of photochromic system based on TiO_2 nanocrystals photocatalyzed color switching of redox dyes presents a new pathway for the design of new kind of color switching systems. The traditional TiO_2 has high photo-oxidative activity, resulting in dye decomposition under UV light irradiation. Preventing the photooxidative activity of TiO_2 and thus promoting photoreductive activity is the key step for constructing photoreversible color switching system. Here we report the design and synthesis of colloidal TiO_2 nanocrystals with photoreductive activity modified with hydroxyl groups or doped with barium ions to produce oxygen vacancies. Hydroxyl groups and oxygen vacancies can act as effective sacrificial electron donors to scavenge photogenerated holes, preclude photodegradation of the dyes, and enable reversible and fast color switching based on TiO_2 nanocrystals and redox dyes.
Construction of photochromic system based on TiO_2 nanocrystals photocatalyzed color switching of redox dyes presents a new pathway for the design of new kind of color switching systems. The traditional TiO_2 has high photo-oxidative activity, resulting in dye decomposition under UV light irradiation. Preventing the photooxidative activity of TiO_2 and thus promoting photoreductive activity is the key step for constructing photoreversible color switching system. Here we report the design and synthesis of colloidal TiO_2 nanocrystals with photoreductive activity modified with hydroxyl groups or doped with barium ions to produce oxygen vacancies. Hydroxyl groups and oxygen vacancies can act as effective sacrificial electron donors to scavenge photogenerated holes, preclude photodegradation of the dyes, and enable reversible and fast color switching based on TiO_2 nanocrystals and redox dyes.
引文
[1]Wang,W.;Ye,Y.;Feng,J.;Chi,M.Angew.Chem.Int.Ed.2015,54:1321
[2]Wang,W.;Ye M.;He,L.;Yin,Y.Nano Lett.2014,14:1681
[3]Wang,W.;Xie.N.;He,L.;Yin,Y.Nat.Commun.2014,5:5459
[2]Wang,W.;Ye M.;He,L.;Yin,Y.Nano Lett.2014,14:1681
[3]Wang,W.;Xie.N.;He,L.;Yin,Y.Nat.Commun.2014,5:5459