Ag2S/CdS/TiO2 Nanotube Array Films with High Photocurrent Density by Spotting Sample Method.
Ag2S/CdS/TiO2 Nanotube Array Films with High Photocurrent Density by Spotting Sample Method.
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DOI：
10.1186/s11671-015-1089-7
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发表时间：
2015-12
影响因子：
--
通讯作者：
Hao J
中科院分区：
文献类型：
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作者：
Sun H;Zhao P;Zhang F;Liu Y;Hao J
采用点样法（SSM）在CdS/TiO2纳米管阵列薄膜的局部区域选择性沉积窄间隙半导体Ag2S （0.9 eV）量子点，制备了Ag2S/CdS/TiO2杂化纳米管阵列薄膜（Ag2S/CdS/TNTs）。通过对半导体量子点的修饰，实现了阳极氧化法制备的二氧化钛（TiO2）纳米管阵列薄膜（TNTs）吸收太阳光的能力和光电流密度的提高。通过连续离子层吸附和反应（SILAR）方法将量子点均匀沉积在tnt上，分别合成了CdS/ tnt、Ag2S/ tnt和Ag2S/CdS/ tnt。x射线粉末衍射（XRD）、扫描电镜（SEM）、透射电镜（TEM）和x射线光电子能谱（XPS）结果表明，SSM和其他薄膜成功制备了Ag2S/CdS/ tnt。与用SILAR法制备的4种薄膜（CdS/ tnt、Ag2S/ tnt、Ag2S/CdS/ tnt）相比，SSM法制备的Ag2S/CdS/ tnt具有更好的吸收能力，在紫外可见范围内（320~800 nm）具有最高的光电流密度。局部沉积周期对其光电性能有很大影响。SSM制备的Ag2S/CdS/ tnt的最佳沉积周期为6次，其光电流密度约为未经改性的tnt的37倍，表明其在太阳能利用领域具有广阔的应用前景。
Ag2S/CdS/TiO2 hybrid nanotube array films (Ag2S/CdS/TNTs) were prepared by selectively depositing a narrow-gap semiconductor—Ag2S (0.9 eV) quantum dots (QDs)—in the local domain of the CdS/TiO2 nanotube array films by spotting sample method (SSM). The improvement of sunlight absorption ability and photocurrent density of titanium dioxide (TiO2) nanotube array films (TNTs) which were obtained by anodic oxidation method was realized because of modifying semiconductor QDs. The CdS/TNTs, Ag2S/TNTs, and Ag2S/CdS/TNTs fabricated by uniformly depositing the QDs into the TNTs via the successive ionic layer adsorption and reaction (SILAR) method were synthesized, respectively. The X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectrum (XPS) results demonstrated that the Ag2S/CdS/TNTs prepared by SSM and other films were successfully prepared. In comparison with the four films of TNTs, CdS/TNTs, Ag2S/TNTs, and Ag2S/CdS/TNTs by SILAR, the Ag2S/CdS/TNTs prepared by SSM showed much better absorption capability and the highest photocurrent density in UV-vis range (320~800 nm). The cycles of local deposition have great influence on their photoelectric properties. The photocurrent density of Ag2S/CdS/TNTs by SSM with optimum deposition cycles of 6 was about 37 times that of TNTs without modification, demonstrating their great prospective applications in solar energy utilization fields.