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CdS and CdTeS quantum dot decorated TiO_2 nanowires. Synthesis and photoefficiency

机译：CdS和CdTeS量子点修饰的TiO_2纳米线。合成与光效率

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An easy process was developed to synthesize TiO_2 nanowires sensitized with CdS and CdTeS quantum dots (QDs) requiring no pretreatment of the TiO_2 nanowires prior to nanoparticle generation. CdS and CdTeS nanoparticles were firstly grown by an in situ colloidal method directly onto the TiO_2 surface, hence not requiring subsequent functionalization of the QDs. The resulting nanostructure assembly and composition was confirmed by transmission electron microscopy (TEM), x-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. Successful decoration of the TiO_2 nanowires by the QDs was observed by TEM, while XPS spectra provided clear evidence for the coexistence of CdS and CdTeS QDs and TiO_2 nanowires. The electronic structure of the TiO_2 nanowires was preserved as indicated by Raman spectroscopy. Preliminary photocurrent measurements showed that inclusion of Te in CdS QDs improved the photocurrent efficiency. Compared to bare TiO_2 nanowires, CdS/TiO_2 nanoassemblies showed an enhancement in photocurrent efficiency of 300% while CdTeS/TiO_2 presented an improvement of 350%. This study indicates that the generation of strongly anchored CdS and CdTeS QDs on a TiO_2 nanowire surface is achievable without introduction of a linker molecule, whose presence is known to decrease the electron injection efficiency.
机译：开发了一种简单的方法来合成用CdS和CdTeS量子点（QD）敏化的TiO_2纳米线，不需要在生成纳米粒子之前对TiO_2纳米线进行预处理。首先通过原位胶体方法将CdS和CdTeS纳米颗粒直接生长在TiO_2表面上，因此不需要随后的QDs功能化。通过透射电子显微镜（TEM），X射线光电子能谱（XPS）和拉曼光谱来确认所得的纳米结构组装体和组成。 TEM观察到QDs成功修​​饰了TiO_2纳米线，而XPS光谱则为CdS和CdTeS QDs和TiO_2纳米线共存提供了清晰的证据。 TiO_2纳米线的电子结构如拉曼光谱法所保留。初步的光电流测量结果表明，在CdS量子点中加入Te可以提高光电流效率。与裸露的TiO_2纳米线相比，CdS / TiO_2纳米组件的光电流效率提高了300％，而CdTeS / TiO_2纳米组件的光电流效率提高了350％。这项研究表明，无需引入接头分子即可在TiO_2纳米线表面上生成强锚定CdS和CdTeS QDs，而这种接头分子的存在会降低电子注入效率。

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