Ultra-high gas sensing properties of porous Cr2O3@SnO2 composite toward NOx based on the p-p heterostructure
Ultra-high gas sensing properties of porous Cr2O3@SnO2 composite toward NOx based on the p-p heterostructure
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DOI：
10.1016/j.ceramint.2022.04.185
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发表时间：
2022-08-01
影响因子：
5.2
通讯作者：
Huang, Xiao-xiao
中科院分区：
文献类型：
--
作者：
An, Yu;Wang, Tian-yang;Huang, Xiao-xiao
近年来，有害气体泄漏造成的环境污染和工业事故不断增加，先进的气体传感器被认为是环境监测和工业安全控制的主要策略之一。本论文合成了Cr2O3膜修饰的无序多孔SnO2(Cr2O3@SnO2)复合材料，作为NOx气体的有效气敏材料。该传感器对100ppm的NO(X)气体的响应率可达71%，响应时间为2.5ppm，响应时间为2.5ppm，同时对NOx气体的最低检测水平仅为0.3ppm，与以往报道的材料相比有较大的降低。良好的气敏性能归功于Cr2O_3薄膜和SnO_2基质之间形成了独特的异质结构，这一区域的电子可以在较小的能量下迁移以克服势垒。因此，O-2和NOx气体可以很容易地从Cr2O_3@SnO_2气敏元件中吸取电子，从而提高气敏性能。更重要的是，本研究为基于p-p异质结合成有效的NO(X)气敏材料提供了新的思路。
In recent years, environmental pollution and industrial accidents caused by the leakage of harmful gas are ever-increasing, and advanced gas sensors have been considered to be one of the main strategies for environmental monitoring and industrial safety control. Herein, Cr2O3 film decorated disordered porous SnO2 (Cr2O3@SnO2) composite was synthesized as an effective gas sensor toward NOx gas. The response of the Cr2O3@SnO2 gas sensor toward 100 ppm NO(x )gas could reach 71 % and the response time is 2.5 s. Meanwhile, the minimum detection level toward NOx gas is only 0.3 ppm, which is pretty lower compared to other materials reported before. The excellent gas-sensitive performance is attributed to the unique heterostructure formed between the Cr2O3 film and the SnO2 matrix, and electrons in this area can migrate to overcome the barrier with less energy. As a result, O-2 and NOx gas can draw electrons from the Cr2O3@SnO2 gas sensor easily, thus leading to improved gas-sensitive performance. More importantly, this research provides a new idea to synthesize effective NO(x )gas -sensitive materials based on the p-p heterostructure.