Direct Evidence of Surface Charges in n-Type Al-Doped ZnO

Direct Evidence of Surface Charges in n-Type Al-Doped ZnO
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n 型掺铝 ZnO 中表面电荷的直接证据

DOI:
10.1021/acs.jpcc.8b04718
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发表时间:
2018
期刊:
The Journal of Physical Chemistry C
影响因子:
--
通讯作者:
Kittilstved, Kevin R.
Kittilstved, Kevin R.
中科院分区:
--
文献类型:
--
作者:
Zhou, Dongming;Wang, Peijian;Roy, Christopher R.;Barnes, Michael D.;Kittilstved, Kevin R.

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用光谱和电子力显微镜技术研究了典型的n型氧化物纳米晶Al~(3+)掺杂氧化锌中电子的基本性质。我们开发并实现了一种新的合成方法,使Al3+能够在单锅反应中以“刻蚀-再生长-掺杂”(ERD)的策略可调地掺入到氧化锌纳米晶体中。用电子吸收光谱和粉末X射线衍射仪研究了Al3+在氧化锌中的系综平均性质和演化,揭示了只有在实施ERD策略后,Al3+才被成功地取代。用静电力显微镜对单个的氧化锌、表面的铝掺杂氧化锌和内部的铝掺杂的氧化锌纳米晶进行了表征,发现表面电荷量和电子的极化率都有很强的响应,这与氧化锌晶格中铝离子的含量有关。这些结果似乎表明,Al~(3+)掺杂的氧化锌纳米晶的电子极化率存在一个上限。
The fundamental properties of electrons in the prototypical n-type oxide nanocrystal, Al3+-doped ZnO, have been studied at both the ensemble and single-particle levels by spectroscopic and electron force microscopic techniques. We developed and implemented a new synthetic methodology that enables the tunable incorporation of Al3+in the ZnO nanocrystal in an “etching–regrowth–doping” (ERD) strategy in a single-pot reaction. The ensemble-averaged properties and evolution of the Al3+speciation in ZnO were studied using electronic absorption spectroscopy and powder X-ray diffraction and reveal the successful substitution of Al3+only after implementation of the ERD strategy. Characterization of individual ZnO, surface Al3+-doped ZnO, and internal Al3+-doped ZnO nanocrystals using electrostatic force microscopy reveals strong responses in both the quantity of surface charges and electron polarizabilities, which are dependent on the amount of Al3+in the ZnO lattice. These results appear to suggest that an upper limit to the electron polarizability exists for Al3+-doped ZnO nanocrystals.
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