Enhanced sensing performance to toluene and xylene by constructing NiGa2O4-NiO heterostructures
Enhanced sensing performance to toluene and xylene by constructing NiGa2O4-NiO heterostructures
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DOI：
10.1016/j.snb.2018.11.072
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发表时间：
2019-03
期刊：
影响因子：
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通讯作者：
Hui Chen;Saren Ao;Guodong Li;Q. Gao;Xiaoxin Zou;Cundi Wei
中科院分区：
文献类型：
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作者：
Hui Chen;Saren Ao;Guodong Li;Q. Gao;Xiaoxin Zou;Cundi Wei
使用基于氧化物半导体的气体/蒸汽传感器选择性检测甲苯（例如甲苯和二甲苯）是非常可取的，但受限于苯化合物的低化学反应性。开发p型半导体氧化物（如NiO），为甲基苯检测提供独特的催化活性是必不可少的方法。然而，p型半导体氧化物的本征响应通常很低。本文利用新型p-p异质结NiGa2O4-NiO纳米微球实现了对甲苯和二甲苯的高性能检测。通过合理控制NiGa2O4-NiO中niga2o4的含量，构建了优化的p-p异质结，显著提高了对甲苯和二甲苯的检测性能。结果表明，50% nia2o4 - nio的传感器具有最佳的传感性能。在230℃下，其对甲苯的最高响应(Rg/Ra= 12.7；对二甲苯的最高响应（Rg/Ra= 16.3）几乎是纯NiO （Rg/Ra< 2）对100 ppm甲苯和二甲苯的最高响应的10倍。更重要的是，该传感器在检测甲基苯时表现出优越的选择性，甚至可以抵抗更多的活性干扰气体/蒸气，如甲醛和乙醇。p-p氧化物异质结具有响应高、选择性好、稳定性好、响应/恢复时间快等特点，是一种很有前途的甲苯和二甲苯检测材料。
The selective detection of methyl benzene (e.g. toluene and xylene) using oxide semiconductor-based gas/vapor sensors is highly desirable but limited by the low chemical reactivity of the benzene compounds. Exploiting p-type semiconductor oxides (e.g., NiO) which provide distinctive catalytic activities for methyl benzene detection is an essential approach. However, the intrinsic responses of p-type semiconductor oxides are often low. In this paper, high-performance toluene and xylene detection has been realized by a sensor based on novel p-p heterojunction NiGa2O4-NiO nanospheres. Construction of optimized p-p heterojunctions, which resulting from the rationally controlling of the NiGa2O4content in NiGa2O4-NiO, leads to significantly promoted sensing properties for toluene and xylene detection. It is found that the sensor based on 50% NiGa2O4-NiO exhibits the best sensing performances. Its highest response (Rg/Ra= 12.7 to toluene; Rg/Ra= 16.3 to xylene) is almost 10 times higher than that of the pure NiO (Rg/Ra< 2) to 100 ppm toluene and xylene at 230 °C. More importantly, the sensor exhibits superior selectively for detection of the methyl benzene even against more reactive interfering gases/vapors, such as formaldehyde and ethanol. The p-p oxide heterojunction suggests a promising sensing material for toluene and xylene detection with high response, excellent selectivity, good stability and rapid response/recover time.