Nano Titanium Monoxide Crystals and Unusual Superconductivity at 11 K,Advanced Materials

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Nano Titanium Monoxide Crystals and Unusual Superconductivity at 11 K
Advanced Materials ( IF 27.4 ) Pub Date : 2018-01-15 , DOI: 10.1002/adma.201706240
Jijian Xu _{1,

2} , Dong Wang ₁ , Heliang Yao ₁ , Kejun Bu ₁ , Jie Pan ₁ , Jianqiao He ₁ , Fangfang Xu ₁ , Zhanglian Hong ₂ , Xiaobo Chen ₃ , Fuqiang Huang _{1,

2,

4}

Affiliation

Nano TiO₂ 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 TiO₁₊_x is newly constructed via a controllable reduction method to synthesize nano TiO core and subsequent soft oxidation to form the shell (TiO₁₊_x). The physical properties measurements of electrical transport and magnetism indicate these TiO@TiO₁₊_x nanocrystals are a type‐ІІ superconductor of a recorded T_c^onset = 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.

中文翻译：

纳米一氧化钛晶体和11 K时异常的超导性

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，人们对纳米TiO ₂进行了深入研究，但是关于纳米结构TiO或其他低价含钛氧化物的合成和物理性能报道很少。在这里，通过可控还原方法新构建了由TiO核制成的核壳纳米粒子，该核包覆有≈5nm的无定形TiO ₁₊_x壳，以合成纳米TiO核并随后进行软氧化以形成壳（TiO ₁₊_x）。电传输和磁性的物理性质测量表明，这些TiO @ TiO ₁₊_x纳米晶体是记录的T _c的ІІ型超导体。在二元Ti–O系统中，^起始时间= 11K。这种不寻常的超导性可以归因于界面效应，这是由于整个外部非晶层上的O / Ti比呈近乎线性的梯度所致。这种新颖的合成方法和增强的超导性可以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。

更新日期：2018-01-15

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