Surface chemistry and growth mechanism of highly oriented, single crystalline Nb-doped TiO2 nanorods,CrystEngComm

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Surface chemistry and growth mechanism of highly oriented, single crystalline Nb-doped TiO2 nanorods
CrystEngComm ( IF 2.6 ) Pub Date : 2020/02/27 , DOI: 10.1039/d0ce00068j
S. M. Mokhtar _{1,

2,

3,

4,

5} , M. K. Ahmad _{5,

6,

7,

8,

9} , S. Harish _{10,

11,

12,

13} , N. K. A. Hamed _{5,

6,

7,

8,

9} , M. Shimomura _{1,

2,

3,

4}

Affiliation

Titanium dioxide (TiO₂) is used in many applications in daily life. To enhance its properties further, rutile Nb-doped TiO₂ nanorods were fabricated using the one-step hydrothermal method. Niobium was chosen as the dopant for its orbital state of Nb⁵⁺ to replace Ti⁴⁺ as it can provide an extra electron, increasing its carrier concentration. We studied the effect of the Nb dopant on the morphological changes in the TiO₂ nanorods and their enhanced carrier transport. After doping, the diameter of the nanorods increased, while their thickness decreased, which could be related to the changes in the surface energy of Cl⁻ with Nb doping, reducing the anisotropic growth. Meanwhile, nanorod density also decreased because Nb attached to the nanorod nucleation sites, inhibiting early growth. X-ray photoelectron spectroscopy (XPS) analysis revealed the existence of Nb on the surface and bulk TiO₂ nanorods. The photocurrent measurements of Nb-doped TiO₂ showed 2.3 times improvement compared to that for pristine TiO₂ nanorods, indicating their enhanced carrier transport.

中文翻译：

高取向单晶掺Nb的TiO2纳米棒的表面化学和生长机理

二氧化钛（TiO ₂）在日常生活中有许多用途。为了进一步提高其性能，采用一步水热法制备了金红石型掺Nb的TiO ₂纳米棒。选择铌作为其Nb ^5+的轨道态的掺杂剂来代替Ti ^4+，因为它可以提供额外的电子，从而增加了其载流子浓度。我们研究了Nb掺杂剂对TiO ₂纳米棒的形态变化及其增强的载流子传输的影响。掺杂后，纳米棒的直径增大，厚度减小，这可能与Cl-的表面能的变化有关^。Nb掺杂可以减少各向异性的增长。同时，由于Nb附着在纳米棒的形核部位，纳米棒的密度也降低了，从而抑制了早期生长。X射线光电子能谱（XPS）分析表明，在表面和块状TiO ₂纳米棒上均存在Nb 。Nb掺杂的TiO ₂的光电流测量结果显示，与原始TiO ₂纳米棒相比，光电流测量结果提高了2.3倍，表明它们的载流子传输增强。

更新日期：2020-03-30

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