Tang Bin, Zhang Mingwen, Yao Ya, Sun Lu, Li Jingliang, Xu Shuping, Chen Wu, Xu Weiqing, Wang Xungai
School of Textile Science and Engineering, Wuhan Textile University, Wuhan 430073, China.
Phys Chem Chem Phys. 2014 Oct 28;16(40):21999-2007. doi: 10.1039/c4cp02874k.
Silver nanoprisms were transformed into nanodecahedra through photoinduction of ultraviolet (UV) light in the presence of titanium dioxide (TiO2) quantum dots (QDs). Subsequently, the silver nanodecahedra were reconverted to silver nanoprisms under sodium lamp if there was sufficient citrate in the reaction system. The localized surface plasmon resonance (LSPR) optical properties of silver nanoparticles were tuned during photoinduced shape conversion. The photocatalytic activity of TiO2 QDs assisted the conversion of prisms to decahedra upon UV light irradiation. Nevertheless, the presence of TiO2 did not inhibit the photoinduced reconversion from decahedra to prisms by sodium light. It was demonstrated that citrate was indispensable in the photoinduction process. In addition, oxygen in solution played a vital role in the reversible shape conversion of silver nanoparticles. Moreover, simulated sunlight can convert silver nanoprisms to nanodecahedra instead of UV light with assistance of TiO2 QDs, which would promote the photoinduced reaction of silver nanoparticles based on a natural light source.
在二氧化钛（TiO₂）量子点（QD）存在的情况下，通过紫外线（UV）光的光诱导作用，银纳米棱镜被转化为纳米十面体。随后，如果反应体系中有足够的柠檬酸盐，银纳米十面体在钠灯下会重新转化为银纳米棱镜。在光诱导形状转换过程中，银纳米颗粒的局域表面等离子体共振（LSPR）光学性质得到了调节。在紫外光照射下，TiO₂量子点的光催化活性有助于棱镜向十面体的转化。然而，TiO₂的存在并不抑制钠光诱导的从十面体到棱镜的再转化。结果表明，柠檬酸盐在光诱导过程中是不可或缺的。此外，溶液中的氧气在银纳米颗粒的可逆形状转换中起着至关重要的作用。此外，在TiO₂量子点的辅助下，模拟太阳光可以将银纳米棱镜转化为纳米十面体，而不是紫外光，这将促进基于自然光的银纳米颗粒的光诱导反应。
