Metal Oxide Heterostructures for Improving Gas Sensing Properties: A Review
Metal oxide semiconductor gas sensors are widely used to detect toxic and inflammable gases in industrial production and daily life. The main research hotspot in this field is the synthesis of gas sensing materials. Previous studies have shown that incorporating two or more metal oxides to form a he...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-12-01
|
| Series: | Materials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1944/16/1/263 |
| _version_ | 1797625390898872320 |
|---|---|
| author | Fan-Jian Meng Rui-Feng Xin Shan-Xin Li |
| author_facet | Fan-Jian Meng Rui-Feng Xin Shan-Xin Li |
| author_sort | Fan-Jian Meng |
| collection | DOAJ |
| description | Metal oxide semiconductor gas sensors are widely used to detect toxic and inflammable gases in industrial production and daily life. The main research hotspot in this field is the synthesis of gas sensing materials. Previous studies have shown that incorporating two or more metal oxides to form a heterojunction interface can exhibit superior gas sensing performance in response and selectivity compared with single phase. This review focuses on mainly the synthesis methods and gas sensing mechanisms of metal oxide heterostructures. A significant number of heterostructures with different morphologies and shapes have been fabricated, which exhibit specific sensing performance toward a specific target gas. Among these synthesis methods, the hydrothermal method is noteworthy due to the fabrication of diverse structures, such as nanorod-like, nanoflower-like, and hollow sphere structures with enhanced sensing properties. In addition, it should be noted that the combination of different synthesis methods is also an efficient way to obtain metal oxide heterostructures with novel morphologies. Despite advanced methods in the metal oxide semiconductors and nanotechnology field, there are still some new issues which deserve further investigation, such as long-term chemical stability of sensing materials, reproducibility of the fabrication process, and selectivity toward homogeneous gases. Moreover, the gas sensing mechanism of metal oxide heterostructures is controversial. It should be clarified so as to further integrate laboratory theory research with practical exploitation. |
| first_indexed | 2024-03-11T09:55:54Z |
| format | Article |
| id | doaj.art-547bedb76f0e4dff9b6a46c06d9c968f |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T09:55:54Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-547bedb76f0e4dff9b6a46c06d9c968f2023-11-16T15:49:17ZengMDPI AGMaterials1996-19442022-12-0116126310.3390/ma16010263Metal Oxide Heterostructures for Improving Gas Sensing Properties: A ReviewFan-Jian Meng0Rui-Feng Xin1Shan-Xin Li2State Key Laboratory of Advanced Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaState Key Laboratory of Advanced Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaSchool of Materials, Sun Yat-sen University, Shenzhen 518107, ChinaMetal oxide semiconductor gas sensors are widely used to detect toxic and inflammable gases in industrial production and daily life. The main research hotspot in this field is the synthesis of gas sensing materials. Previous studies have shown that incorporating two or more metal oxides to form a heterojunction interface can exhibit superior gas sensing performance in response and selectivity compared with single phase. This review focuses on mainly the synthesis methods and gas sensing mechanisms of metal oxide heterostructures. A significant number of heterostructures with different morphologies and shapes have been fabricated, which exhibit specific sensing performance toward a specific target gas. Among these synthesis methods, the hydrothermal method is noteworthy due to the fabrication of diverse structures, such as nanorod-like, nanoflower-like, and hollow sphere structures with enhanced sensing properties. In addition, it should be noted that the combination of different synthesis methods is also an efficient way to obtain metal oxide heterostructures with novel morphologies. Despite advanced methods in the metal oxide semiconductors and nanotechnology field, there are still some new issues which deserve further investigation, such as long-term chemical stability of sensing materials, reproducibility of the fabrication process, and selectivity toward homogeneous gases. Moreover, the gas sensing mechanism of metal oxide heterostructures is controversial. It should be clarified so as to further integrate laboratory theory research with practical exploitation.https://www.mdpi.com/1996-1944/16/1/263metal oxide semiconductorsensing materialsheterostructuressynthesis methodsgas sensing mechanism |
| spellingShingle | Fan-Jian Meng Rui-Feng Xin Shan-Xin Li Metal Oxide Heterostructures for Improving Gas Sensing Properties: A Review Materials metal oxide semiconductor sensing materials heterostructures synthesis methods gas sensing mechanism |
| title | Metal Oxide Heterostructures for Improving Gas Sensing Properties: A Review |
| title_full | Metal Oxide Heterostructures for Improving Gas Sensing Properties: A Review |
| title_fullStr | Metal Oxide Heterostructures for Improving Gas Sensing Properties: A Review |
| title_full_unstemmed | Metal Oxide Heterostructures for Improving Gas Sensing Properties: A Review |
| title_short | Metal Oxide Heterostructures for Improving Gas Sensing Properties: A Review |
| title_sort | metal oxide heterostructures for improving gas sensing properties a review |
| topic | metal oxide semiconductor sensing materials heterostructures synthesis methods gas sensing mechanism |
| url | https://www.mdpi.com/1996-1944/16/1/263 |
| work_keys_str_mv | AT fanjianmeng metaloxideheterostructuresforimprovinggassensingpropertiesareview AT ruifengxin metaloxideheterostructuresforimprovinggassensingpropertiesareview AT shanxinli metaloxideheterostructuresforimprovinggassensingpropertiesareview |