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초록

In this study, bacterial cellulose (BC) with high mechanical strength, crystallinity, and excellent biocompatibility was prepared. BC-carbon quantum dots (BC-CQD) were synthesized by thermal pyrolysis at 200 oC. Fluorescence properties of BC-CQD solution were assessed by fluorescence spectrophotometry. BC-CQD solution was excited at 365 nm, and emission-maxima of the solution was at 440 nm. The optical characteristics of synthesized BCCQD showed excitation wavelength-dependent emission wavelength-pattern as the emission intensity varied with excitation wavelength. These results showed similar excitation wavelength range, 440-550 nm, as observed for CQD with conventional plant celluloses. In addition, BC-CQD/poly(vinyl alcohol) (PVA) composite film exhibited extended fluorescence stability, for more than 7 days. The thermal stability of BC-CQD was demonstrated to be lower than that of PVA film through the weight loss estimation of BC-CQD/PVA film by thermogravimetric analysis. Therefore, it can potentially be applied as membrane material, in electrochemiluminescence (ECL) diagnosis and in biomedical fields.

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