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Experimental determination of the curvature-induced intra-wall polarization of inorganic nanotubes
Nanoscale ( IF 5.8 ) Pub Date : 2021-11-15 , DOI: 10.1039/d1nr06462b Marie-Claire Pignié 1 , Sabyasachi Patra 1 , Lucie Huart 1 , Aleksandar R Milosavljević 2 , Jean Philippe Renault 1 , Jocelyne Leroy 1 , Christophe Nicolas 2 , Olivier Sublemontier 1 , Sophie Le Caër 1 , Antoine Thill 1
Nanoscale ( IF 5.8 ) Pub Date : 2021-11-15 , DOI: 10.1039/d1nr06462b Marie-Claire Pignié 1 , Sabyasachi Patra 1 , Lucie Huart 1 , Aleksandar R Milosavljević 2 , Jean Philippe Renault 1 , Jocelyne Leroy 1 , Christophe Nicolas 2 , Olivier Sublemontier 1 , Sophie Le Caër 1 , Antoine Thill 1
Affiliation
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Inspired by a natural nano-mineral known as imogolite, aluminosilicate inorganic nanotubes are appealing systems for photocatalysis. Here, we studied two types of synthetic imogolites: one is completely hydrophilic (IMO-OH), while the other has a hydrophilic exterior and a hydrophobic interior (IMO-CH3), enabling the encapsulation of organic molecules. We combined UV-Vis diffuse reflectance spectroscopy of imogolite powders and X-ray photoelectron spectroscopy of deposited imogolite films and isolated nanotubes agglomerates to obtain not only the band structure, but also the quantitative intra-wall polarization of both synthetic imogolites for the first time. The potential difference across the imogolite wall was determined to be 0.7 V for IMO-OH and around 0.2 V for IMO-CH3. The high curvature of the nanotubes, together with the thinness of their wall, favors efficient spontaneous charge separation and electron exchange reactions on both the internal and external nanotube surfaces. In addition, the positions of their valence and conduction band edges make them interesting candidates for co-catalysts or doped catalysts for water splitting, among other possible photocatalytic reactions relevant to energy and the environment.
中文翻译：
无机纳米管曲率诱导壁内极化的实验测定
受到称为伊莫缨石的天然纳米矿物的启发，铝硅酸盐无机纳米管是一种有吸引力的光催化系统。在这里，我们研究了两种类型的合成伊莫缨石：一种是完全亲水的 (IMO-OH)，而另一种具有亲水的外部和疏水的内部 (IMO-CH 3 )，能够封装有机分子。我们将伊毛缟石粉末的 UV-Vis 漫反射光谱和沉积的伊毛缟石薄膜和分离的纳米管团聚体的 X 射线光电子能谱相结合，不仅首次获得了能带结构，而且还获得了两种合成伊缟石的定量壁内极化。IMO-OH 的伊毛燧石壁的电位差确定为 0.7 V，IMO-CH 3的电位差约为 0.2 V. 纳米管的高曲率以及它们的壁薄，有利于在纳米管内部和外部表面上进行有效的自发电荷分离和电子交换反应。此外，它们的价和导带边缘的位置使它们成为用于分解水的助催化剂或掺杂催化剂的有趣候选者，以及与能量和环境相关的其他可能的光催化反应。
更新日期：2021-11-24
中文翻译：
无机纳米管曲率诱导壁内极化的实验测定
受到称为伊莫缨石的天然纳米矿物的启发，铝硅酸盐无机纳米管是一种有吸引力的光催化系统。在这里，我们研究了两种类型的合成伊莫缨石：一种是完全亲水的 (IMO-OH)，而另一种具有亲水的外部和疏水的内部 (IMO-CH 3 )，能够封装有机分子。我们将伊毛缟石粉末的 UV-Vis 漫反射光谱和沉积的伊毛缟石薄膜和分离的纳米管团聚体的 X 射线光电子能谱相结合，不仅首次获得了能带结构，而且还获得了两种合成伊缟石的定量壁内极化。IMO-OH 的伊毛燧石壁的电位差确定为 0.7 V，IMO-CH 3的电位差约为 0.2 V. 纳米管的高曲率以及它们的壁薄，有利于在纳米管内部和外部表面上进行有效的自发电荷分离和电子交换反应。此外，它们的价和导带边缘的位置使它们成为用于分解水的助催化剂或掺杂催化剂的有趣候选者，以及与能量和环境相关的其他可能的光催化反应。
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