Effect of the Functionalization of Porous Silicon/WO3 Nanorods with Pd Nanoparticles and Their Enhanced NO2-Sensing Performance at Room Temperature
The decoration of noble metal nanoparticles (NPs) on the surface of metal oxide semiconductors to enhance material characteristics and gas-sensing performance has recently attracted increasing attention from researchers worldwide. Here, we have synthesized porous silicon (PS)/WO3 nanorods (NRs) func...
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MDPI AG
2018-05-01
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| Series: | Materials |
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| Online Access: | http://www.mdpi.com/1996-1944/11/5/764 |
| _version_ | 1811219199379374080 |
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| author | Xiaoyong Qiang Ming Hu Boshuo Zhao Yue Qin Ran Yang Liwei Zhou Yuxiang Qin |
| author_facet | Xiaoyong Qiang Ming Hu Boshuo Zhao Yue Qin Ran Yang Liwei Zhou Yuxiang Qin |
| author_sort | Xiaoyong Qiang |
| collection | DOAJ |
| description | The decoration of noble metal nanoparticles (NPs) on the surface of metal oxide semiconductors to enhance material characteristics and gas-sensing performance has recently attracted increasing attention from researchers worldwide. Here, we have synthesized porous silicon (PS)/WO3 nanorods (NRs) functionalized with Pd NPs to enhance NO2 gas-sensing performance. PS was first prepared using electrochemical methods and worked as a substrate. WO3 NRs were synthesized by thermally oxidizing W film on the PS substrate. Pd NPs were decorated on the surface of WO3 NRs via in-situ reduction of the Pd complex solution by using Pluronic P123 as the reducing agent. The gas-sensing characteristics were tested at different gas concentrations and different temperatures ranging from room temperature to 200 °C. Results revealed that, compared with bare PS/WO3 NRs and Si/WO3 NRs functionalized with Pd NPs, the Pd-decorated PS/WO3 NRs exhibited higher and quicker responses to NO2, with a detection concentration as low as 0.25 ppm and a maximum response at room temperature. The gas-sensing mechanism was also investigated and is discussed in detail. The high surface area to volume ratio of PS and the reaction-absorption mechanism can be explained the enhanced sensing performance. |
| first_indexed | 2024-04-12T07:21:48Z |
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| id | doaj.art-7a03c382bfad4a3b93a930b191c23340 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-04-12T07:21:48Z |
| publishDate | 2018-05-01 |
| publisher | MDPI AG |
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| spelling | doaj.art-7a03c382bfad4a3b93a930b191c233402022-12-22T03:42:17ZengMDPI AGMaterials1996-19442018-05-0111576410.3390/ma11050764ma11050764Effect of the Functionalization of Porous Silicon/WO3 Nanorods with Pd Nanoparticles and Their Enhanced NO2-Sensing Performance at Room TemperatureXiaoyong Qiang0Ming Hu1Boshuo Zhao2Yue Qin3Ran Yang4Liwei Zhou5Yuxiang Qin6School of Microelectronics, Tianjin University, Tianjin 300072, ChinaSchool of Microelectronics, Tianjin University, Tianjin 300072, ChinaSchool of Microelectronics, Tianjin University, Tianjin 300072, ChinaSchool of Microelectronics, Tianjin University, Tianjin 300072, ChinaSchool of Microelectronics, Tianjin University, Tianjin 300072, ChinaSchool of Microelectronics, Tianjin University, Tianjin 300072, ChinaSchool of Microelectronics, Tianjin University, Tianjin 300072, ChinaThe decoration of noble metal nanoparticles (NPs) on the surface of metal oxide semiconductors to enhance material characteristics and gas-sensing performance has recently attracted increasing attention from researchers worldwide. Here, we have synthesized porous silicon (PS)/WO3 nanorods (NRs) functionalized with Pd NPs to enhance NO2 gas-sensing performance. PS was first prepared using electrochemical methods and worked as a substrate. WO3 NRs were synthesized by thermally oxidizing W film on the PS substrate. Pd NPs were decorated on the surface of WO3 NRs via in-situ reduction of the Pd complex solution by using Pluronic P123 as the reducing agent. The gas-sensing characteristics were tested at different gas concentrations and different temperatures ranging from room temperature to 200 °C. Results revealed that, compared with bare PS/WO3 NRs and Si/WO3 NRs functionalized with Pd NPs, the Pd-decorated PS/WO3 NRs exhibited higher and quicker responses to NO2, with a detection concentration as low as 0.25 ppm and a maximum response at room temperature. The gas-sensing mechanism was also investigated and is discussed in detail. The high surface area to volume ratio of PS and the reaction-absorption mechanism can be explained the enhanced sensing performance.http://www.mdpi.com/1996-1944/11/5/764room temperaturegas sensorporous siliconPd nanoparticlesWO3 nanorods |
| spellingShingle | Xiaoyong Qiang Ming Hu Boshuo Zhao Yue Qin Ran Yang Liwei Zhou Yuxiang Qin Effect of the Functionalization of Porous Silicon/WO3 Nanorods with Pd Nanoparticles and Their Enhanced NO2-Sensing Performance at Room Temperature Materials room temperature gas sensor porous silicon Pd nanoparticles WO3 nanorods |
| title | Effect of the Functionalization of Porous Silicon/WO3 Nanorods with Pd Nanoparticles and Their Enhanced NO2-Sensing Performance at Room Temperature |
| title_full | Effect of the Functionalization of Porous Silicon/WO3 Nanorods with Pd Nanoparticles and Their Enhanced NO2-Sensing Performance at Room Temperature |
| title_fullStr | Effect of the Functionalization of Porous Silicon/WO3 Nanorods with Pd Nanoparticles and Their Enhanced NO2-Sensing Performance at Room Temperature |
| title_full_unstemmed | Effect of the Functionalization of Porous Silicon/WO3 Nanorods with Pd Nanoparticles and Their Enhanced NO2-Sensing Performance at Room Temperature |
| title_short | Effect of the Functionalization of Porous Silicon/WO3 Nanorods with Pd Nanoparticles and Their Enhanced NO2-Sensing Performance at Room Temperature |
| title_sort | effect of the functionalization of porous silicon wo3 nanorods with pd nanoparticles and their enhanced no2 sensing performance at room temperature |
| topic | room temperature gas sensor porous silicon Pd nanoparticles WO3 nanorods |
| url | http://www.mdpi.com/1996-1944/11/5/764 |
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