SINTESIS CARBON NANODOTS SULFUR (C-DOTS SULFUR) DENGAN METODE MICROWAVE
Abstract
Sintesis C-Dots dengan metode microwave menggunakan bahan sulfur, urea dan citric acid telah berhasil dibuat. C-Dots disintesis pada kondisi low (70 W). Pada masing-masing kondisi dibuat dengan variasi waktu sintesis yang berbeda-beda yaitu 5 menit, 15 menit, 25 menit, 35 menit, 45 menit dan 55 menit. Hasil sintesis C-Dots dengan variasi waktu sintesis berbeda menunjukan pergeseran warna dari kuning muda menjadi coklat tua. Emisi cahaya C-Dots yang diamati dalam cahaya UV menunjukan perpendaran warna hijau kekuningan. Meningkatnya lama waktu sintesis menyebabkan penyerapan spektrum absorbansi yang dihasilkan semakin luas dan semakin rendah nilai energi gapnya yaitu pada rentang 2,1 eV sampai 1,7 eV. Hal ini mengindikasikan bahwa efek waktu sintesis mempengaruhi sifat optik C-Dots yang dihasilkan. Dari pengukuran spektrum transmitansi FTIR dapat teramati struktur unit C-Dots. Terdapat keberadaan gugus fungsi seperti -OH, C-H, C-O, C=C, C-N dan SH. Proses microwave menyebabkan gugus fungsi mengalami degradasi intensitas transmitansi. Secara sederhana, hasil analisis gugus fungsi dari FTIR hasil sintesis dari sulfur, urea dan citric acid melalui proses microwave mengindikasikan secara kuat bahwa terdapat C-Dots.
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Synthesis of C-Dots using sulfur materials, urea and citric acid was successfully prepared by microwave methods. C-Dots synthesized in conditions low (70 W). In each of the conditions are prepared by the time variation of different synthesis is 5 minutes, 15 minutes, 25 minutes, 35 minutes, 45 minutes and 55 minutes. The results of the synthesis of C-Dots with different synthesis shows the time variation of light yellow color shift to dark brown. C-Dots light emission was observed in UV light yellowish green color indicates luminiscence. Increasing the length of time the synthesis of lead absorption resulting absorbance spectrum wider and lower energy value is in the range gapnya 2.1 eV to 1.7 eV. This indicates that the effect of synthesis time affect the optical properties of the resulting C-Dots. FTIR transmittance spectra of measurement can be observed structural unit C-Dots. There is the presence of functional groups like that OH, CH, CO, C = C, CN and SH. Microwave process causing degraded functional groups transmittance intensity. Simply put, the results of the analysis of the functional group of the FTIR results of the synthesis of sulfur, urea and citric acid through microwave process indicated strongly that there is a C-Dots.
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