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首页> 外文期刊>RSC Advances >A room temperature operated ammonia gas sensor based on Ag-decorated TiO2 quantum dot clusters
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A room temperature operated ammonia gas sensor based on Ag-decorated TiO2 quantum dot clusters

机译：基于Ag修饰的TiO2量子点簇的室温氨气传感器

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In this research, nanometer size aggregates (clusters) of titanium dioxide (TiO _(2) ) quantum dot clusters (QDs) have been successfully prepared via a convenient hydrolysis method at a low temperature (80 °C). Then different amounts (0–5%) of Ag were further decorated on the TiO _(2) QDs via dipping and annealing under a nitrogen atmosphere. After Ag decoration, the TiO _(2) QD sensing materials were synthesized, and characterization and NH _(3) gas sensing performance studies were carried out. Analysis via XRD and EDS was conducted, and the results showed that Ag ~(+) ions were successfully reduced to Ag and decorated on the surface of the anatase TiO _(2) QDs. Noble metal Ag acted as the sites for adsorbates, catalysts, or promoters during the surface reactions, and as the element improving the thermal stability of the nanostructure. Therefore, the Ag-decorated gas sensor possessed better gas sensing performance than an undecorated gas sensor, and 3% Ag dopant proved to be the optimal amount of addition. The fabricated 3% Ag-decorated TiO _(2) QDs gas sensor, compared with the undecorated TiO _(2) QDs sensor, displayed a 6-times-higher sensing response at room temperature and demonstrated excellent gas sensing properties toward 10–100 ppm NH _(3) gas, good selectivity, gas sensitivity and stability, rapid response/recovery time, and a linear relationship between the response and the target gas concentration. In particular, the excellent performance of the Ag decorated-TiO _(2) QDs gas sensor was achieved at room temperature, which suggests the great possibility of a prompt gas sensing response, with the use of paper as a substrate, that requires a low operation temperature.
机译：在这项研究中，已经通过一种便捷的水解方法在低温（80°C）下成功制备了纳米尺寸的二氧化钛（TiO_（2））量子点簇（QDs）聚集体。然后，通过浸入和在氮气氛下退火，在TiO _（2）QD上进一步装饰不同数量（0-5％）的Ag。经过银装饰后，合成了TiO _（2）QD传感材料，并进行了表征和NH _（3）气敏性能研究。通过XRD和EDS分析，结果表明Ag〜（+）离子被成功还原为Ag，并在锐钛矿型TiO _（2）QDs表面修饰。贵金属Ag在表面反应期间充当吸附物，催化剂或促进剂的位点，并且是改善纳米结构热稳定性的元素。因此，装饰有Ag的气体传感器比未装饰的气体传感器具有更好的气体传感性能，并且3％的Ag掺杂剂被证明是最佳添加量。与未装饰的TiO _（2）QDs传感器相比，制造的3％Ag装饰的TiO _（2）QDs气体传感器在室温下显示出6倍高的感测响应，并且在10–100的温度下表现出出色的气体感测性能ppm NH _（3）气体，良好的选择性，气体敏感性和稳定性，快速的响应/恢复时间以及响应与目标气体浓度之间的线性关系。特别是，在室温下获得了带有Ag修饰的TiO _（2）QDs气体传感器的出色性能，这表明以纸为基材的气体感应响应迅速的可能性很大，而纸张的使用率较低。工作温度。

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