Research Article
Gold Nanoparticles: Synthesis, Stability Test, and Application for the Rice Growth
Table 1
Absorption peak position and intensity variation of CTAB AuNPs with time in different media.
| | Hour | Position 1 | Position 2 | Intensity 1% | Intensity 2% |
| Water | 0 | 639 | 840— | 100 | 100 | 0.25 | 639 | 840— | 100 | 100 | 0.5 | 639 | 840— | 100 | 100 | 1 | 639 | 840— | 100 | 100 | 2 | 639 | 840— | 100 | 100 | 72 | 639 | 840— | 94 | 93 | 168 | 639 | 840— | 102 | 102 |
| pH 4 buffer | 0 | 640 | 852.2— | 90 | 104 | 0.25 | 617 | 852.2— | 63 | 87 | 0.5 | 617 | 852.2— | 57 | 79 | 1 | 617 | 852.2— | 53 | 73 | 2 | 617 | 852.2— | 48 | 66 | 72 | 640— | 852.2— | 7 | 9 | 168 | 640— | 852.2— | 25 | 29 |
| pH 7 buffer | 0 | 623 | 851 | 80 | 98 | 0.25 | 620 | 851— | 57 | 74 | 0.5 | 620 | 851— | 53 | 67 | 1 | 620 | 851— | 50 | 63 | 2 | 620 | 851— | 44 | 57 | 72 | 623— | 851— | 1 | 2 | 168 | 623— | 851— | 14 | 16 |
| pH 8 buffer | 0 | 629 | 850 | 84 | 105 | 0.25 | 607 | 850— | 56 | 78 | 0.5 | 607 | 850— | 52 | 70 | 1 | 607 | 850— | 48 | 65 | 2 | 607 | 850— | 43 | 60 | 72 | 629— | 850— | 1 | 1 | 168 | 629— | 850— | 18 | 21 |
| pH 10 buffer | 0 | 631 | 836 | 90 | 97 | 0.25 | 611 | 836— | 53 | 71 | 0.5 | 611 | 836— | 47 | 64 | 1 | 611 | 836— | 42 | 53 | 2 | 611 | 836— | 36 | 48 | 72 | 631— | 836— | 2 | 2 | 168 | 631— | 836— | 17 | 21 |
| Biobuffer | 0 | 560 | 584 | 61 | 68 | 0.25 | 560 | 585 | 60 | 67 | 0.5 | 560 | 586 | 60 | 66 | 1 | 560 | 587 | 59 | 67 | 2 | 560 | 588 | 59 | 67 | 3 | 560 | 588 | 59 | 67 | 72 | 560 | 584— | 59 | 65 | 168 | 560 | 584— | 57 | 64 |
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For the number with “—” behind means no clear peak can be observed and we measure the intensity at that wavelength.
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