Influence of rGO Cladding in Improving the Sensitivity and Selectivity of ZnO Nanoflowers-Based Alcohol Sensor
| Autor: | Debanjan Acharyya, Aman Kumar Saini, Partha Bhattacharyya |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Graphene 010401 analytical chemistry Oxide 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Dip-coating 0104 chemical sciences law.invention chemistry.chemical_compound symbols.namesake Band bending X-ray photoelectron spectroscopy chemistry Chemical engineering law symbols Wafer Methanol Electrical and Electronic Engineering 0210 nano-technology Raman spectroscopy Instrumentation |
| Zdroj: | IEEE Sensors Journal. 18:1820-1827 |
| ISSN: | 2379-9153 1530-437X |
| Popis: | Development of ultra-sensitive and selective 2-propanol sensor employing hybrid structure of reduced graphene oxide (rGO) and 3-D ZnO nanoflowers (NFs) is reported in this paper. The 3-D ZnO NFs were synthesized on n-Si wafer, using liquid phase deposition technique, while a dip coating technique was adopted for the deposition of rGO, in the form of discrete claddings, on the ZnO NFs layer. The detailed morphological (field emission scanning electron microscopy) and structural (Raman and XPS) characterizations were carried out to compare the structural and morphological properties of pristine ZnO NFs and rGO-ZnO NFs hybrid structure. The sensing properties of ZnO NFs and rGO-ZnO NFs devices were investigated toward different alcohol vapors (2-propanol, ethanol, and methanol) in the concentration range of 0.5–700 ppm at 100 °C–275 °C. The rGO-ZnO NFs 3-D hybrid device offered ultra-high sensitivity (645% response magnitude at 700 ppm) toward 2-propanol at ~160 °C. In addition, the same sensor also offered excellent selectivity against interfering neighbors (i.e., ethanol, methanol, acetone, and benzene). The underlying mechanism for such experimental findings has been discussed with the properties of rGO–ZnO hybrid junction and respective band bending in air and target species. |
| Databáze: | OpenAIRE |
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