Department of Chemistry, Faculty of Arts and Sciences, Sakarya University, Turkey.
Langmuir. 2012 Nov 6;28(44):15736-42. doi: 10.1021/la303724q. Epub 2012 Oct 29.
Dendritic and nanostructured Pb(1-x)Sn(x)Te thin films were synthesized on gold substrates from acidic solutions through a simple electrodeposition route. The deposition potential of thin films was determined using cyclic voltammetry. All of the thin films were deposited in both the absence and presence of cetyltrimethylammonium bromide (CTAB) as a cationic surfactant. X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), and Fourier transform infrared (FT-IR) spectroscopy were employed to characterize the deposits. XRD results showed that the diffraction peaks shift to larger angles as mole fraction x increases, indicating the formation of Pb(1-x)Sn(x)Te alloy. Morphological analysis revealed that the obtained thin films in the absence of CTAB were composed of dendrites, while the obtained thin films in the presence of CTAB were made of nanoparticles. Growth mechanisms for the dendritic and nanostructured thin films were discussed. The optical absorption studies show that the band gap of Pb(1-x)Sn(x)Te thin films grown with short deposition times could be tuned from 0.21 to 0.35 eV by adding only the surfactant to the deposition solution.
通过简单的电沉积法，从酸性溶液中在金基底上合成了树枝状和纳米结构的 Pb(1-x)Sn(x)Te 薄膜。使用循环伏安法确定了薄膜的沉积电位。所有薄膜均在没有和存在十六烷基三甲基溴化铵（CTAB）作为阳离子表面活性剂的情况下沉积。使用 X 射线衍射（XRD）、扫描电子显微镜（SEM）、原子力显微镜（AFM）和傅里叶变换红外（FT-IR）光谱对沉积物进行了表征。XRD 结果表明，随着摩尔分数 x 的增加，衍射峰向较大角度移动，表明形成了 Pb(1-x)Sn(x)Te 合金。形态分析表明，在不存在 CTAB 的情况下获得的薄膜由树枝状组成，而在存在 CTAB 的情况下获得的薄膜由纳米颗粒组成。讨论了树枝状和纳米结构薄膜的生长机制。光学吸收研究表明，通过仅在沉积溶液中添加表面活性剂，生长时间较短的 Pb(1-x)Sn(x)Te 薄膜的带隙可以从 0.21 调整到 0.35 eV。
