Research Article
Surface Functionality Features of Porous Silicon Prepared and Treated in Different Conditions
Table 3
Data of por-Si surface characterization by the adsorption of acid-base indicators with different
values.
| | Indicator | Supposed type of
surface centers | Content of surface centers, nmole/cm2
(on both sides of ~1 × 1 cm plates) | Series I
Anodization current density 30 mA/cm2, more uniform surface | Series II
Anodization current density 80 mA/cm2, less uniform surface |
| | 2.5 | m-Nitroaniline | Acidic hydroxyls
≡Si–OH | 28,5 | 25,2 |
| | 6.4 | Bromocresol purple | Almost neutral hydroxyls
=Si(OH)2 | 7,24 | 24,9 |
| | 8.8 | Thymol blue | Basic hydroxyls
–Si(OH)3 | 1,17 | 10,1 |
| | 14.2 | Ethylene glycol | Si atoms | 6,1 | 356 |
|
|
