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Yttrium - Substituted SnO2 thin films and its gas sensing activity against NH3 gas: Characterization and sensitivity evaluation
Sensors and Actuators A: Physical ( IF 4.1 ) Pub Date : 2020-08-27 , DOI: 10.1016/j.sna.2020.112303
S. Maheswari , M. Karunakaran , K. Kasirajan , L. Bruno Chandrasekar , P. Boomi

Pure and yttrium-doped tin oxide (SnO2:Y) thin film was successfully coated on a glass substrate using a nebulizer spray pyrolysis technique with a constant temperature of 400 °C. Coated films are characterized by a variety of techniques like XRD, SEM with EDX, TEM, elemental mapping, UV, PL, and gas sensors. All XRD film patterns demonstrate a well-defined polycrystalline phase, which fits well with the SnO2 tetragonal rutile structure. Surface morphology analysis revealed that the surface roughness of the SnO2:Y thin films increased with an increase in yttrium concentration. Transmission Electron Microscopy and SAED findings result suggested that the SnO2:Y thin films were highly crystalline. The optical band gap (3.66 eV–3.81 eV) rises due to Y- doping points the credibility of SnO2 thin films. Photoluminescence (PL) spectroscopy revealed a large number of oxygen vacancies in SnO2:Y films. The PL intensity varies with the doping concentrations. The gas sensing capability of nanostructured films was compared to the concentration of Y-doping and NH3 concentrations from 25 ppm to 125 ppm. For the SnO2:Y(5 wt.%) film, a significant response with short response time and recovery time (23 s, 7 s) to 25 ppm NH3 is observed at room temperature. The yttrium loaded SnO2 sensor is indeed a promising candidate for NH3 detection.



中文翻译:

钇取代的SnO 2薄膜及其对NH 3气体的气敏活性:表征和灵敏度评估

使用恒定温度为400°C的雾化器喷雾热解技术,将纯的和掺钇的氧化锡(SnO 2:Y)薄膜成功地涂覆在玻璃基板上。涂膜的特征在于多种技术,例如XRD,带有EDX的SEM,TEM,元素映射,UV,PL和气体传感器。所有XRD膜图样均显示出明确定义的多晶相,该相与SnO 2四方金红石结构非常吻合。表面形态分析表明,SnO 2:Y薄膜的表面粗糙度随着钇浓度的增加而增加。透射电镜和SAED的发现结果表明SnO 2:Y薄膜是高度结晶的。由于Y掺杂点的增加,光学带隙(3.66 eV–3.81 eV)增大了SnO 2薄膜的可信度。光致发光(PL)光谱显示SnO 2:Y膜中有大量的氧空位。PL强度随掺杂浓度而变化。将纳米结构膜的气体感测能力与Y掺杂浓度和NH 3浓度(25 ppm至125 ppm)进行了比较。对于SnO 2:Y(5 wt。%)薄膜,在室温下观察到对25 ppm NH 3的响应时间短,恢复时间短(23 s,7 s)的显着响应。钇负载的SnO 2传感器确实是NH 3的有希望的候选者 检测。

更新日期:2020-08-27
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