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首页> 外文期刊>Nanotechnology >NanoCdS confined within titanate nanotubes for efficient photocatalytic hydrogen production under visible light illumination
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NanoCdS confined within titanate nanotubes for efficient photocatalytic hydrogen production under visible light illumination

机译：限制在钛酸酯纳米管中的NanoCdS，用于在可见光照射下有效的光催化制氢

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摘要

CdS nanoparticles were confined within titanate nanotubes (TNTs) by an ion-exchange reaction and a subsequent sulfurization process. Prior to the ion-exchange reaction, the exterior surfaces of the TNTs were modified by a silane coupling agent to make CdS nanoparticles selectively deposit on the inner wall. The composites were characterized by high-resolution transmission electron microscopy, powder x-ray diffraction, inductively coupled plasma atomic emission spectrometry, N_2 adsorption-desorption and UV-vis absorption spectra. The results confirm that CdS in the range of 2-3 nm in diameter are confined within the inner cavity of the TNTs. CdS confined within TNTs shows a significant blue-shift of the absorption band edge compared with CdS nanoparticles deposited on the exterior surface of TNTs. Also the TNTs-confined CdS composite exhibits enhanced photocatalytic activity and photostability for hydrogen evolution under visible light illumination due to the quantum size effect of CdS as a result of the spatial confinement effect of the TNTs.
机译：通过离子交换反应和随后的硫化过程，将CdS纳米粒子限制在钛酸酯纳米管（TNT）中。在离子交换反应之前，通过硅烷偶联剂对TNT的外表面进行改性，以使CdS纳米颗粒选择性地沉积在内壁上。通过高分辨率透射电子显微镜，粉末X射线衍射，电感耦合等离子体原子发射光谱，N_2吸附-解吸和UV-vis吸收光谱对复合材料进行表征。结果证实，直径在2-3nm范围内的CdS被限制在TNT的内腔内。与沉积在TNTs外表面的CdS纳米粒子相比，限制在TNTs中的CdS表现出吸收带边缘的明显蓝移。由于TNTs的空间限制效应，由于CdS的量子尺寸效应，TNTs约束的CdS复合材料还表现出增强的光催化活性和在可见光照射下氢析出的光稳定性。

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