Room-temperature nitrogen-dioxide sensors based on ZnO1-x coatings deposited by solution precursor plasma spray
Room-temperature nitrogen-dioxide sensors based on ZnO1-x coatings deposited by solution precursor plasma spray
复制标题
基于溶液前驱体等离子喷涂沉积 ZnO1-x 涂层的室温二氧化氮传感器
DOI：
10.1016/j.snb.2016.11.024
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发表时间：
2017
影响因子：
8.4
通讯作者：
Debliquy Marc
中科院分区：
文献类型：
--
作者：
Zhang Chao;Geng Xin;Liao Hanlin;Li Chang-Jiu;Debliquy Marc
化学计量比的ZnO具有大于2.6eV的带隙，并且对可见光没有响应或响应很弱，这极大地抑制了其应用。本文报道了溶液前驱体等离子体喷涂（SPPS）工艺可以有效地缩小ZnO的禁带宽度，并将ZnO的吸收扩展到可见光区，这主要是由于SPPS工艺中产生的高浓度氧空位所致。通过光致发光谱、电子顺磁共振和X射线光电子能谱分析，发现在SPPS制备的ZnO 1 − x中注入了大量的氧空位。高浓度氧空位的产生主要归因于SPPS本身提供的还原气氛以及快速的加热和冷却过程。这项工作的发现为开发窄禁带ZnO 1 −x开辟了新的途径。我们提出，SPPS ZnO 1 − x涂层可以直接用作可见光照明下的敏感材料。氧空位对其光学和电学性质有很大的影响。ZnO 1 − x薄膜在整个可见光区都有明显的吸收，其禁带宽度为2.15 eV，比化学计量ZnO薄膜的禁带宽度（3.37 eV）窄得多。基于ZnO 1 − x涂层的传感器在室温下对NO2表现出显著的响应。此外，传感器响应随NO2浓度线性增加。传感器性能的提高归因于SPPS提供的丰富的氧空位和特殊的涂层微观结构。
The stoichiometric ZnO has a bandgap greater than 2.6 eV and has no or weak response to visible light, which greatly suppresses its applications. We report here that a process of solution precursor plasma spray (SPPS) can effectively narrow the bandgap and extend the absorption of ZnO to visible light region, which mainly results from highly concentrated oxygen vacancies generated during SPPS process. By photoluminescence spectroscopy, electron paramagnetic resonance and X-ray photoelectron spectroscopy, we found that a large number of oxygen vacancies were implanted into ZnO1−xprepared by SPPS. The generation of highly concentrated oxygen vacancies were mainly attributed to reducing atmosphere as well as fast heating and cooling process inherently provided by SPPS. The findings of this work create a new way for developing narrow bandgap ZnO1−x. We present that the SPPS ZnO1−xcoatings can be utilized directly as sensitive materials under visible-light illumination. The oxygen vacancies have considerable influence on its optical and electrical properties. The ZnO1−xcoatings exhibited an obvious absorption covering the whole visible-light region and its bandgap was calculated to be 2.15 eV which was much narrower than that of stoichiometric ZnO (3.37 eV). The sensors based on ZnO1−xcoatings showed significant responses to NO2at room temperature. In addition, the sensor response increased linearly with NO2concentration. The enhanced sensor properties were attributed to the rich oxygen vacancies and special coating microstructure provided by SPPS.