State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P. R. China.
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, P. R. China.
Adv Mater. 2018 Mar;30(10). doi: 10.1002/adma.201706240. Epub 2018 Jan 15.
Nano TiO is investigated intensely due to extraordinary photoelectric performances in photocatalysis, new-type solar cells, etc., but only very few synthesis and physical properties have been reported on nanostructured TiO or other low valent titanium-containing oxides. Here, a core-shell nanoparticle made of TiO core covered with a ≈5 nm shell of amorphous TiO is newly constructed via a controllable reduction method to synthesize nano TiO core and subsequent soft oxidation to form the shell (TiO ). The physical properties measurements of electrical transport and magnetism indicate these TiO@TiO nanocrystals are a type-ІІ superconductor of a recorded T = 11 K in the binary Ti-O system. This unusual superconductivity could be attributed to the interfacial effect due to the nearly linear gradient of O/Ti ratio across the outer amorphous layer. This novel synthetic method and enhanced superconductivity could open up possibilities in interface superconductivity of nanostructured composites with well-controlled interfaces.
纳米 TiO 由于在光催化、新型太阳能电池等方面具有非凡的光电性能而受到广泛研究，但关于纳米结构 TiO 或其他低价含钛氧化物的合成和物理性质的报道却很少。在这里，通过可控还原法构建了一种由 TiO 核覆盖约 5nm 厚无定形 TiO 壳的核壳纳米粒子，以合成纳米 TiO 核，并随后进行软氧化形成壳（TiO ）。电输运和磁性的物理性质测量表明，这些 TiO@TiO 纳米晶是二元 Ti-O 体系中记录到 T=11K 的 I 型超导体。这种异常的超导性可能归因于由于外层非晶层中 O/Ti 比的线性梯度，导致界面效应。这种新颖的合成方法和增强的超导性可能为具有良好控制界面的纳米结构复合材料的界面超导性开辟可能性。
