Table 3 Experimental parameters for the post-growth treatment of NWs in different concentrations of ammonium hydroxide solution and their effect over the optical response of the ZnO nanomaterial as measured by photoluminescence
S. no. | NH4OH concentration (mM) | pH | Time (min) | Temperature (°C) | IUV | IG | IUV/IG |
|---|---|---|---|---|---|---|---|
1 | As-grown | 6.6 | N/A | N/A | 0.61 | 0.14 | 4.4 |
2 | 10 | 11.1 | 30 | 80 | 0.39 | 0.28 | 1.4 |
3 | 40 | 11.5 | 30 | 80 | 0.33 | 0.24 | 1.37 |
4 | 100 | 11.7 | 30 | 80 | 0.3 | 0.14 | 2.1 |
5 | 200 | 11.9 | 30 | 80 | 0.16 | 0.13 | 1.2 |