Low-Dimensional Nanostructures Based on Cobalt Oxide (Co3O4) in Chemical-Gas Sensing
Abstract
:1. Introduction
2. Material and Sensing
2.1. Characteristics Properties of a Chemical/Gas Sensor
2.2. Conducting Mechanism of Chemical/Gas Sensor
- Metal to semiconductor;
- Outer conductive and narrow accumulation layers at the surface of the nanowire;
- Narrow accumulation layers at the surface of the grains and broad bulk of the nanowire;
- Nanowire to nanowire.
3. Growth Techniques of 1D Nano Structures of the Co3O4
3.1. Hydrothermal and Solvothermal Techniques
3.2. Electrospinning Techniques
4. Overview of Reported 1 D Nano Structured Co3O4 Gas Sensors
4.1. Sensing toward Ethanol (C2H5OH)
4.2. Sensing toward Acetone (C3H6O)
4.3. Sensing toward Carbon Monoxide (CO)
4.4. Sensing toward Toluene (C7H8) and Xylene (C8H10)
4.5. Sensing toward Ammonia (NH3)
4.6. Detection toward Hydrogen Sulfide (H2S)
4.7. Sensing toward Diethyl Ether (C4H10O, DEE)
4.8. Sensing toward Formaldehyde (HCHO)
4.9. Sensing toward Dimethyl Methylphosphonate (C3H9O3P, DMMP)
4.10. Sensing toward Triethylamine (C6H15N, TEA)
5. Conclusions and Outlook
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Metal Oxide | Reducing Gases | Oxidizing Gases |
---|---|---|
p-type | Resistance increase | Resistance decrease |
n-type | Resistance decrease | Resistance increase |
Co3O4 Morphology | Synthesis Procedure | Analyte Gas | Concentration (ppm) | Top (°C) | Response | Tres (s) | Trec (s) | Reference |
---|---|---|---|---|---|---|---|---|
Nanorods | Solvothermal | C2H5OH | 100 | 300 | 25.7 a | 29 | 10–13 | [3] |
Nanorods | Coprecipitation | CO | 50 | 250 | 6.5 b | NA | NA | [15] |
Nano wires | Hydrothermal | CO | 20 | 100 | 13.5 b | 62.5 | 100 | [16] |
Nanowires | Hydrothermal | C6H15N | 100 | 250 | 4 b | NA | NA | [22] |
Nanowires | Hydrothermal | C3H6O | 150 | 200 | 23 b | NA | NA | [23] |
Nanorods | Hydrothermal | C3H6O | 74570 | 300 | 18.5 c | 40 | 180 | [24] |
Rhombus shaped nanorod | Hydrothermal | C2H5OH | 500 | 160 | 71 b | 90 | 60 | [25] |
Nanorods | Solvothermal | C7H8 | 200 | 200 | 35 b | 90 | 55 | [27] |
Nanorods | Hydrothermal | (C2H5)2O | 100 | 160 | 110.34 c | NA | NA | [30] |
Nano needles | Hydrothermal | C2H5OH | 130 | 100 | 89.6 b | NA | NA | [34] |
Hierarchical Nanofiber | Hydrothermal | C3H6O | 100 | 190 | 9.3 b | 7 | 1 | [52] |
Hierarchical nanorods | Hydrothermal | NH3 | 100 | 160 | 11.2 b | 2 | 10 | [53] |
Cr-doped nanorods | Solvothermal | C7H8 | 5 | 250 | 17 b | NA | NA | [59] |
C8H10 | 18 b | NA | NA | |||||
Nanofiber | Electrospinning | CO | 5 | 100 | 2.4 b | 14 | 36 | [62] |
Nano Fiber | Electrospinning | C2H5OH | 100 | 300 | 22.1 b | NA | NA | [63] |
Nano Fiber | Electrospinning | C2H5OH | 100 | 301 | 51.2 b | 16 | 8 | [65] |
Composite nanofiber | Electrospinning | C3H6O | 5 | 300 | 2.29 b | NA | NA | [66] |
Nano Fiber | Electrospinning | C8H10 | 100 | 255 | 10.6 a | 15 | 22 | [67] |
Nano chains | Hydrothermal | H2S | 100 | 300 | 4.3 b | 46 | 24 | [68] |
Nano tubes | Facile solution route | HCHO | 50 | 180 | 6.3 b | 3 | 1 | [69] |
Co3O4/CuO nanotubes | Electrospinning | C3H2F6O | 0.5 | 90 | 8.8 b | 7.3 | 5.2 | [70] |
Composite nanofiber | Electrospinning | NH3 | 50 | RT | 53.6 c | 4 | 300 | [71] |
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Kumarage, G.W.C.; Comini, E. Low-Dimensional Nanostructures Based on Cobalt Oxide (Co3O4) in Chemical-Gas Sensing. Chemosensors 2021, 9, 197. https://doi.org/10.3390/chemosensors9080197
Kumarage GWC, Comini E. Low-Dimensional Nanostructures Based on Cobalt Oxide (Co3O4) in Chemical-Gas Sensing. Chemosensors. 2021; 9(8):197. https://doi.org/10.3390/chemosensors9080197
Chicago/Turabian StyleKumarage, Gayan W. C., and Elisabetta Comini. 2021. "Low-Dimensional Nanostructures Based on Cobalt Oxide (Co3O4) in Chemical-Gas Sensing" Chemosensors 9, no. 8: 197. https://doi.org/10.3390/chemosensors9080197
APA StyleKumarage, G. W. C., & Comini, E. (2021). Low-Dimensional Nanostructures Based on Cobalt Oxide (Co3O4) in Chemical-Gas Sensing. Chemosensors, 9(8), 197. https://doi.org/10.3390/chemosensors9080197