Highly Sensitive ZnO(Ga, In) for Sub-ppm Level NO2 Detection: Effect of Indium Content
| Autor: | V.B. Zaytsev, Darya Filatova, Anna Zaytseva, Alexander Gaskov, Marina Rumyantseva, F. M. Spiridonov, N. A. Vorobyeva |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Spreading resistance profiling Analytical chemistry chemistry.chemical_element 02 engineering and technology Zinc Conductivity 01 natural sciences Analytical Chemistry lcsh:Biochemistry zinc oxide Ga and In codoped ZnO NO2 gas sensor 0103 physical sciences Microscopy lcsh:QD415-436 Physical and Theoretical Chemistry 010302 applied physics Conductance Atmospheric temperature range 021001 nanoscience & nanotechnology Nanocrystalline material chemistry 0210 nano-technology Indium |
| Zdroj: | Chemosensors, Vol 5, Iss 2, p 18 (2017) Chemosensors; Volume 5; Issue 2; Pages: 18 |
| ISSN: | 2227-9040 |
| Popis: | Nanocrystalline ZnO, ZnO(Ga), and ZnO(Ga, In) samples with different indium contents were prepared by wet-chemical method and characterized in detail by ICP-MS and XRD methods. Gas sensing properties toward NO2 were studied at 150–450 °C by DC conductance measurements. The optimal temperature for gas sensing experiments was determined. The dependence of the ZnO(Ga, In) sensor signal to NO2 at 250 °C correlates with the change of conductivity of the samples. The introduction of indium into the system leads to an increase in the values of the sensor signal in the temperature range T < 250 °C. The investigation of the local sample conductivity by scanning spreading resistance microscopy demonstrates that, at high indium content, the sensor properties are determined by the In–Ga–Zn–O layer that forms on the ZnO surface. |
| Databáze: | OpenAIRE |
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