Mn-doped ZnO microspheres prepared by solution combustion synthesis for room temperature NH3 sensing
Despite being the most favorable ammonia (NH3) gas sensors, metal oxide semiconductors fail to deliver high selectivity and room temperature (RT) sensing. Tuning the metal oxide with doping is an attractive way of overcoming these disadvantages. Herein, we report Mn-doped ZnO microspheres as promisi...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-12-01
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| Series: | Applied Surface Science Advances |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666523922001398 |
| _version_ | 1811187902298718208 |
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| author | Asha Ramesh D.S. Gavaskar P. Nagaraju Suryakala Duvvuri S.R.K. Vanjari C. Subrahmanyam |
| author_facet | Asha Ramesh D.S. Gavaskar P. Nagaraju Suryakala Duvvuri S.R.K. Vanjari C. Subrahmanyam |
| author_sort | Asha Ramesh |
| collection | DOAJ |
| description | Despite being the most favorable ammonia (NH3) gas sensors, metal oxide semiconductors fail to deliver high selectivity and room temperature (RT) sensing. Tuning the metal oxide with doping is an attractive way of overcoming these disadvantages. Herein, we report Mn-doped ZnO microspheres as promising sensors for highly sensitive and selective RT sensing of NH3. ZnO and 2 wt% Mn-doped ZnO microspheres were synthesized by a low-cost and fast solution combustion synthesis, and their structure, morphology, and gas sensing properties were investigated. Mn-doping resulted in a change in the lattice parameters, an increase in the oxygen vacancies, and surface acidity of ZnO as confirmed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Temperature programmed desorption (TPD), respectively. Mn-doped ZnO showed a response (Ra/Rg) of 20.2 in 100 ppm NH3, which is significantly higher than ZnO. The sensor showed high selectivity, three times higher than that of ZnO, and good stability. Improvement in the sensing performance of Mn-doped ZnO is attributed to the increase in the defects and surface acidity with Mn-doping. |
| first_indexed | 2024-04-11T14:11:22Z |
| format | Article |
| id | doaj.art-7c9fd52a380d4ca5b31b210f503e97ab |
| institution | Directory Open Access Journal |
| issn | 2666-5239 |
| language | English |
| last_indexed | 2024-04-11T14:11:22Z |
| publishDate | 2022-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Applied Surface Science Advances |
| spelling | doaj.art-7c9fd52a380d4ca5b31b210f503e97ab2022-12-22T04:19:42ZengElsevierApplied Surface Science Advances2666-52392022-12-0112100349Mn-doped ZnO microspheres prepared by solution combustion synthesis for room temperature NH3 sensingAsha Ramesh0D.S. Gavaskar1P. Nagaraju2Suryakala Duvvuri3S.R.K. Vanjari4C. Subrahmanyam5Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana 502285, IndiaDepartment of Physics, Osmania University, Amberpet, Hyderabad, Telangana 500007, IndiaDepartment of Physics, CMR Technical Campus, Kandlakoya, Hyderabad, Telangana 501401, IndiaDepartment of Chemistry, GITAM University, Visakhapatnam, Andhra Pradesh 530045, IndiaDepartment of Electrical Engineering, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana 502285, IndiaDepartment of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana 502285, India; Corresponding author.Despite being the most favorable ammonia (NH3) gas sensors, metal oxide semiconductors fail to deliver high selectivity and room temperature (RT) sensing. Tuning the metal oxide with doping is an attractive way of overcoming these disadvantages. Herein, we report Mn-doped ZnO microspheres as promising sensors for highly sensitive and selective RT sensing of NH3. ZnO and 2 wt% Mn-doped ZnO microspheres were synthesized by a low-cost and fast solution combustion synthesis, and their structure, morphology, and gas sensing properties were investigated. Mn-doping resulted in a change in the lattice parameters, an increase in the oxygen vacancies, and surface acidity of ZnO as confirmed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Temperature programmed desorption (TPD), respectively. Mn-doped ZnO showed a response (Ra/Rg) of 20.2 in 100 ppm NH3, which is significantly higher than ZnO. The sensor showed high selectivity, three times higher than that of ZnO, and good stability. Improvement in the sensing performance of Mn-doped ZnO is attributed to the increase in the defects and surface acidity with Mn-doping.http://www.sciencedirect.com/science/article/pii/S2666523922001398AmmoniaGas sensorTransition metal dopingSurface acidityMn-doped ZnORoom temperature sensing |
| spellingShingle | Asha Ramesh D.S. Gavaskar P. Nagaraju Suryakala Duvvuri S.R.K. Vanjari C. Subrahmanyam Mn-doped ZnO microspheres prepared by solution combustion synthesis for room temperature NH3 sensing Applied Surface Science Advances Ammonia Gas sensor Transition metal doping Surface acidity Mn-doped ZnO Room temperature sensing |
| title | Mn-doped ZnO microspheres prepared by solution combustion synthesis for room temperature NH3 sensing |
| title_full | Mn-doped ZnO microspheres prepared by solution combustion synthesis for room temperature NH3 sensing |
| title_fullStr | Mn-doped ZnO microspheres prepared by solution combustion synthesis for room temperature NH3 sensing |
| title_full_unstemmed | Mn-doped ZnO microspheres prepared by solution combustion synthesis for room temperature NH3 sensing |
| title_short | Mn-doped ZnO microspheres prepared by solution combustion synthesis for room temperature NH3 sensing |
| title_sort | mn doped zno microspheres prepared by solution combustion synthesis for room temperature nh3 sensing |
| topic | Ammonia Gas sensor Transition metal doping Surface acidity Mn-doped ZnO Room temperature sensing |
| url | http://www.sciencedirect.com/science/article/pii/S2666523922001398 |
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