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Green light-driven enhanced ammonia sensing at room temperature based on seed-mediated growth of gold-ferrosoferric oxide dumbbell-like heteronanostructures.
Nanoscale ( IF 5.8 ) Pub Date : 2020-08-18 , DOI: 10.1039/d0nr05530a Sujing Yu 1 , Dongzhi Zhang , Yu Zhang , Wenjing Pan , Benjamin Edem Meteku , Fangdu Zhang , Jingbin Zeng
Nanoscale ( IF 5.8 ) Pub Date : 2020-08-18 , DOI: 10.1039/d0nr05530a Sujing Yu 1 , Dongzhi Zhang , Yu Zhang , Wenjing Pan , Benjamin Edem Meteku , Fangdu Zhang , Jingbin Zeng
Affiliation
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Since there is excellent synergy between heterostructures and noble metals due to their unique electro-optical and catalytic properties, the introduction of noble metals into metal oxide semiconductors has substantially improved the performance of gas sensors. However, most of the reported noble metal–metal oxide composites are generally prepared as simple hybrids; hence, there is lack of control over their structure, morphology and dimension. Herein, we report a seed-mediated growth of dumbbell-like Au–Fe3O4 heteronanostructured gas sensors for ammonia detection under green light illumination, in which the particle sizes of Au and Fe3O4 were readily tuned in a wide range. The ammonia gas-sensing performances of Au–Fe3O4 heteronanostructures were greatly improved at room temperature by regulating their dimensions. In particular, the sensitivity improved by 30% while the response and recovery time shortened by 20 s and 50 s for the 7.5 nm Au-loaded Fe3O4-based sensor toward 5 ppm ammonia under 520 nm green light illumination as compared to that in the absence of light. This can be ascribed to the localized surface plasmon effect of Au and the Schottky junction formed at the interface between Au and Fe3O4. Interestingly, the Au–Fe3O4 heteronanostructure exhibits a unique p-type to n-type reversible transition for ammonia detection due to the nature of Fe3O4 NPs related to the trade-off between oxygen vacancies and electron transfer caused by ammonia adsorption. In addition, the calculation based on first-principle theory reveals enhanced adsorption capacities of Fe3O4 for ammonia after Au-doping.
中文翻译：
基于种子介导的金铁氧化铁哑铃状异质结构的生长，在室温下绿光驱动的增强氨感测。
由于异质结构和贵金属之间由于其独特的电光和催化特性而具有出色的协同作用，因此将贵金属引入金属氧化物半导体已大大改善了气体传感器的性能。但是，大多数已报道的贵金属-金属氧化物复合物通常是作为简单的杂化物制备的。因此，缺乏对其结构，形态和尺寸的控制。在这里，我们报道了种子状生长的哑铃状Au-Fe 3 O 4异质结构气体传感器，用于在绿光照射下检测氨气，其中Au和Fe 3 O 4的粒径易于在宽范围内调节。Au–Fe 3的氨气传感性能通过调节其尺寸，O 4异质结构在室温下得到了极大的改善。尤其是，在520 nm绿光照射下，对7.5 nm Au负载的Fe 3 O 4基传感器对5 ppm氨，灵敏度提高了30％，响应和恢复时间分别缩短了20 s和50 s。在没有光的情况下。这可以归因于Au的局部表面等离子体激元效应和在Au和Fe 3 O 4之间的界面处形成的肖特基结。有趣的是，在Au-的Fe 3 ö 4 heteronanostructure表现出独特的p型为氨检测n型可逆过渡由于Fe的性质3O 4 NPs与氨吸附引起的氧空位和电子转移之间的平衡有关。此外，基于第一性原理的计算表明，掺杂金后，Fe 3 O 4对氨的吸附能力增强。
更新日期：2020-09-24
中文翻译：
基于种子介导的金铁氧化铁哑铃状异质结构的生长，在室温下绿光驱动的增强氨感测。
由于异质结构和贵金属之间由于其独特的电光和催化特性而具有出色的协同作用，因此将贵金属引入金属氧化物半导体已大大改善了气体传感器的性能。但是，大多数已报道的贵金属-金属氧化物复合物通常是作为简单的杂化物制备的。因此，缺乏对其结构，形态和尺寸的控制。在这里，我们报道了种子状生长的哑铃状Au-Fe 3 O 4异质结构气体传感器，用于在绿光照射下检测氨气，其中Au和Fe 3 O 4的粒径易于在宽范围内调节。Au–Fe 3的氨气传感性能通过调节其尺寸，O 4异质结构在室温下得到了极大的改善。尤其是，在520 nm绿光照射下，对7.5 nm Au负载的Fe 3 O 4基传感器对5 ppm氨，灵敏度提高了30％，响应和恢复时间分别缩短了20 s和50 s。在没有光的情况下。这可以归因于Au的局部表面等离子体激元效应和在Au和Fe 3 O 4之间的界面处形成的肖特基结。有趣的是，在Au-的Fe 3 ö 4 heteronanostructure表现出独特的p型为氨检测n型可逆过渡由于Fe的性质3O 4 NPs与氨吸附引起的氧空位和电子转移之间的平衡有关。此外，基于第一性原理的计算表明，掺杂金后，Fe 3 O 4对氨的吸附能力增强。
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