Acetone vapor sensing characteristics of Cr-doped ZnO nanofibers

Figures & data

Figure 1. Schematic representation of the electrospinning process.

Figure 2. AFD of the NFs of (a) pure ZnO, (b) 1 w%, (c) 2 w%, (d) 3 w% and (e) 4 w% Cr-doped ZnO NFs.

Figure 3. EDX mapping and spectra of 4 w% Cr-doped ZnO NF.

Figure 4. XRD patterns of the undoped and various concentrations of Cr-doped ZnO NFs.

Figure 5. Transmission and bandgap energy spectra of (a) pure ZnO and (b–e) 1, 2, 3 and 4 w% Cr-doped ZnO NFs.

Figure 6. Sensing mechanism for acetone vapor.

Figure 7. Response of the undoped and Cr-doped ZnO NFs to acetone vapor.

Table 1. Comparison of sensing parameters for acetone vapor.

Material type	Type of gas	Gas concentration (ppm)	Response	Response time (s)	Recovery time (s)	Operating temp (°C)	References
Cr-ZnO	Carbon monoxide	500 sccm	65.45	172.3	37.20	50	Habib et al. (2019)
Cr-ZnO	Acetone	500	90	70	954	300	N. H. Al-Hardan et al. (2013)
Cr-ZnO	Nitrogen dioxide	5	635	–	–	100	Chang, Chen, et al. (2014)
Cr-ZnO	Ethanol	100	24	1	5	100	Wang et al. (2010)
Cr-ZnO	Ammonia	50	5	160	140	Room temperature	Nakarungsee et al. (2020)
Cr-ZnO	ethanol	400	45	–	–	300	Zhu et al. (2017)
This work	Acetone	50	88.65	80	55	260

Figure 8. Transient responses of the 4 w% Cr-doped NFs for various concentrations of acetone ethanol vapor.

Figure 9. Sensitivity of the ZnO nanostructured sensors to a variety of VOCs.

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Data availability statement

The authors confirm that the data supporting the findings of this study are available within the article.