Environmental stability of 2D anisotropic tellurium containing nanomaterials: anisotropic to isotropic transition.
Environmental stability of 2D anisotropic tellurium containing nanomaterials: anisotropic to isotropic transition.
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DOI：
10.1039/c7nr02397a
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发表时间：
2017-08
期刊：
影响因子：
6.7
通讯作者：
Si-jie Yang;H. Cai;Bin Chen;C. Ko;V. Ongun Özçelik;D. Frank Ogletree;Claire E. White;Yuxia Shen;S. Tongay
中科院分区：
文献类型：
--
作者：
Si-jie Yang;H. Cai;Bin Chen;C. Ko;V. Ongun Özçelik;D. Frank Ogletree;Claire E. White;Yuxia Shen;S. Tongay
我们通过角分辨拉曼光谱、原子力显微镜 (AFM) 和环境 X 射线光电子 (XPS) 测量报告了纳米尺度环境分子相互作用驱动的半导体伪一维 GaTe 和 ZrTe3 纳米材料的振动（拉曼）光谱和结构转变。结果表明，含碲伪一维材料在一周内发生剧烈的结构和物理变化。在此过程中，新的拉曼峰开始出现，表面粗糙度大幅增加。令人惊讶的是，GaTe、ZrTe3 和 α-TeOx 的老化拉曼光谱显示出惊人的相似性，表明碲发生了氧化。仔细的环境测试表明，GaTe 和 H2O 分子之间的相互作用在 GaTe 最外层形成 Te-O 键，从而导致新出现的拉曼峰、肖特基结电流密度大大降低以及各向异性到各向同性的结构转变。这些发现为这些材料系统的老化机制提供了新的解释，为先前推测为六方相的老化GaTe的拉曼光谱提供了新的解释，并引入了由表面分子相互作用引起的各向异性到各向同性的转变效应。
We report on the vibrational (Raman) spectrum and structural transformation of semiconducting pseudo-1D GaTe and ZrTe3 nanomaterials driven by ambient molecular interactions at the nanoscale by angle-resolved Raman spectroscopy, atomic force microscopy (AFM), and environmental X-ray photoelectron (XPS) measurements. The results show that tellurium containing pseudo-1D materials undergo drastic structural and physical changes within a week. During this process, new Raman peaks start to emerge and surface roughness increases substantially. Surprisingly, aged Raman spectra of GaTe, ZrTe3, and α-TeOx show striking similarities suggesting that oxidation of tellurium takes place. Careful, environmental tests reveal that the interaction between GaTe and H2O molecules forms Te-O bonds at the outermost layers of GaTe which leads to newly emerging Raman peaks, a much reduced Schottky junction current density, and an anisotropic to isotropic structural transition. These findings offer fresh interpretation of the aging mechanisms for these material systems, provide new interpretation of the Raman spectrum of aged GaTe which was previously presumed to be of the hexagonal phase, and introduce an anisotropic to isotropic transformation effect induced by molecular interactions on the surface.