A study of the effect of morphology on the optical and electrical properties of TiO2 nanotubes for gas sensing applications

IF 0.9 4区物理与天体物理 Q4 PHYSICS, APPLIED

European Physical Journal-applied Physics Pub Date : 2020-06-01 DOI:10.1051/epjap/2020190267

Alba Arenas-Hernandez, C. Zuñiga-Islas, Julio César Mendoza-Cervantes

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引用次数: 9

Abstract

In this paper, we report the results of the optical and electrical properties of TiO2 nanotubes with different morphologies for gas sensing applications. Four nanomaterials of TiO2 were prepared by electrochemical anodization using four different electrolyte solutions: 0.255 wt% NH4 F with 1 wt%, 3 wt%, 6 wt% and 9 wt% of deionized water in ethylene glycol. Micrographs by scanning electron microscopy (SEM) showed different morphologies caused by the variation in the water content of the solutions. Consequently, as an effect of morphology, the photoluminescence intensity in the visible spectrum was modified. By a change of the crystalline phase of TiO2 nanotubes, the oxygen vacancies increased and affected to the optical and electrical properties of TiO2 films. These films were used for detecting gas at room temperature. Hence, we studied and analyzed the relationship of the morphology, elemental composition, phase composition, band gap energy and defect states as a function of the electrical resistance change of TiO2 nanotubes to understand and improve the sensor response.

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形貌对气体传感用TiO2纳米管光电性能影响的研究

在本文中，我们报告了不同形貌的二氧化钛纳米管在气敏应用中的光学和电学性质的结果。采用0.255 wt% NH4 F、1 wt%、3 wt%、6 wt%和9 wt%去离子水的乙二醇溶液，通过电化学阳极氧化法制备了4种纳米TiO2材料。通过扫描电子显微镜(SEM)观察到溶液含水量的变化所引起的不同形貌。因此，由于形貌的影响，可见光谱中的光致发光强度发生了变化。通过改变TiO2纳米管的晶相，氧空位增加，影响TiO2薄膜的光学和电学性能。这些薄膜用于在室温下检测气体。因此，我们研究和分析了TiO2纳米管的形貌、元素组成、相组成、带隙能量和缺陷状态与电阻变化的关系，以了解和提高传感器的响应。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

European Physical Journal-applied Physics 物理-物理：应用

CiteScore

1.90

自引率

10.00%

发文量

审稿时长

1.9 months

期刊介绍： EPJ AP an international journal devoted to the promotion of the recent progresses in all fields of applied physics. The articles published in EPJ AP span the whole spectrum of applied physics research.