High-Sensitivity, Low Detection Limit, and Fast Ammonia Detection of Ag-NiFe<sub>2</sub>O<sub>4</sub> Nanocomposite and DFT Study
Ammonia (NH<sub>3</sub>) is one of the characteristic gases used to detect food spoilage. In this study, the 10 wt% Ag-NiFe<sub>2</sub>O<sub>4</sub> nanocomposite was synthesized via the hydrothermal method. Characterization results from SEM, XRD, and XPS analyzed...
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2025-07-01
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| author | Xianfeng Hao Yuehang Sun Zongwei Liu Gongao Jiao Dongzhi Zhang |
| author_facet | Xianfeng Hao Yuehang Sun Zongwei Liu Gongao Jiao Dongzhi Zhang |
| author_sort | Xianfeng Hao |
| collection | DOAJ |
| description | Ammonia (NH<sub>3</sub>) is one of the characteristic gases used to detect food spoilage. In this study, the 10 wt% Ag-NiFe<sub>2</sub>O<sub>4</sub> nanocomposite was synthesized via the hydrothermal method. Characterization results from SEM, XRD, and XPS analyzed the microstructure, elemental composition, and crystal lattice features of the composite, confirming its successful fabrication. Under the optimal working temperature of 280 °C, the composite exhibited excellent gas-sensing properties towards NH<sub>3</sub>. The 10 wt% Ag-NiFe<sub>2</sub>O<sub>4</sub> sensor demonstrates rapid response and recovery, as well as high sensitivity, towards 30 ppm NH<sub>3</sub>, with response and recovery times of merely 3 s and 9 s, respectively, and a response value of 4.59. The detection limit is as low as 0.1 ppm, meeting the standards for food safety detection. Additionally, the sensor exhibits good short-term repeatability and long-term stability. Additionally, density functional theory (DFT) simulations were conducted to investigate the gas-sensing advantages of the Ag-NiFe<sub>2</sub>O<sub>4</sub> composite by analyzing the electron density and density of states, thereby providing theoretical guidance for experimental testing. This study facilitates the rapid detection of food spoilage and promotes the development of portable food safety detection devices. |
| format | Article |
| id | doaj-art-e98ee00dfdf443e3af9a003f55e5bbf4 |
| institution | DOAJ |
| issn | 2079-4991 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | MDPI AG |
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| series | Nanomaterials |
| spelling | doaj-art-e98ee00dfdf443e3af9a003f55e5bbf42025-08-20T02:47:10ZengMDPI AGNanomaterials2079-49912025-07-011514108810.3390/nano15141088High-Sensitivity, Low Detection Limit, and Fast Ammonia Detection of Ag-NiFe<sub>2</sub>O<sub>4</sub> Nanocomposite and DFT StudyXianfeng Hao0Yuehang Sun1Zongwei Liu2Gongao Jiao3Dongzhi Zhang4College of Control Science and Engineering, China University of Petroleum (East China), Qingdao 266580, ChinaCollege of Control Science and Engineering, China University of Petroleum (East China), Qingdao 266580, ChinaCollege of Control Science and Engineering, China University of Petroleum (East China), Qingdao 266580, ChinaCollege of Control Science and Engineering, China University of Petroleum (East China), Qingdao 266580, ChinaCollege of Control Science and Engineering, China University of Petroleum (East China), Qingdao 266580, ChinaAmmonia (NH<sub>3</sub>) is one of the characteristic gases used to detect food spoilage. In this study, the 10 wt% Ag-NiFe<sub>2</sub>O<sub>4</sub> nanocomposite was synthesized via the hydrothermal method. Characterization results from SEM, XRD, and XPS analyzed the microstructure, elemental composition, and crystal lattice features of the composite, confirming its successful fabrication. Under the optimal working temperature of 280 °C, the composite exhibited excellent gas-sensing properties towards NH<sub>3</sub>. The 10 wt% Ag-NiFe<sub>2</sub>O<sub>4</sub> sensor demonstrates rapid response and recovery, as well as high sensitivity, towards 30 ppm NH<sub>3</sub>, with response and recovery times of merely 3 s and 9 s, respectively, and a response value of 4.59. The detection limit is as low as 0.1 ppm, meeting the standards for food safety detection. Additionally, the sensor exhibits good short-term repeatability and long-term stability. Additionally, density functional theory (DFT) simulations were conducted to investigate the gas-sensing advantages of the Ag-NiFe<sub>2</sub>O<sub>4</sub> composite by analyzing the electron density and density of states, thereby providing theoretical guidance for experimental testing. This study facilitates the rapid detection of food spoilage and promotes the development of portable food safety detection devices.https://www.mdpi.com/2079-4991/15/14/1088Ag-NiFe<sub>2</sub>O<sub>4</sub>NH<sub>3</sub> sensorlow detection limitDFTsimulations |
| spellingShingle | Xianfeng Hao Yuehang Sun Zongwei Liu Gongao Jiao Dongzhi Zhang High-Sensitivity, Low Detection Limit, and Fast Ammonia Detection of Ag-NiFe<sub>2</sub>O<sub>4</sub> Nanocomposite and DFT Study Nanomaterials Ag-NiFe<sub>2</sub>O<sub>4</sub> NH<sub>3</sub> sensor low detection limit DFT simulations |
| title | High-Sensitivity, Low Detection Limit, and Fast Ammonia Detection of Ag-NiFe<sub>2</sub>O<sub>4</sub> Nanocomposite and DFT Study |
| title_full | High-Sensitivity, Low Detection Limit, and Fast Ammonia Detection of Ag-NiFe<sub>2</sub>O<sub>4</sub> Nanocomposite and DFT Study |
| title_fullStr | High-Sensitivity, Low Detection Limit, and Fast Ammonia Detection of Ag-NiFe<sub>2</sub>O<sub>4</sub> Nanocomposite and DFT Study |
| title_full_unstemmed | High-Sensitivity, Low Detection Limit, and Fast Ammonia Detection of Ag-NiFe<sub>2</sub>O<sub>4</sub> Nanocomposite and DFT Study |
| title_short | High-Sensitivity, Low Detection Limit, and Fast Ammonia Detection of Ag-NiFe<sub>2</sub>O<sub>4</sub> Nanocomposite and DFT Study |
| title_sort | high sensitivity low detection limit and fast ammonia detection of ag nife sub 2 sub o sub 4 sub nanocomposite and dft study |
| topic | Ag-NiFe<sub>2</sub>O<sub>4</sub> NH<sub>3</sub> sensor low detection limit DFT simulations |
| url | https://www.mdpi.com/2079-4991/15/14/1088 |
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