This research focused on the preparation of carbon dots (CDs) using cellulose hydrolysis in ionic liquid (IL) at a low temperature of 65 °C without additional treatments. The morphologies of the CDs were observed by TEM. The chemical structures and the optical properties were characterized by XPS, FT-IR, UV-vis and PL spectroscopies. As the cellulose was incubated longer in the IL, the size of the CDs was reduced. Besides, the core of the CD was simultaneously nitrogen-doped more with graphitic N, resulting in the increase of the quantum yield up to ∼33 %. For the easier application of the CD in solid state, the CD embedded cellulose film was simply prepared via the one-pot dissolution. The prepared cellulose film showed excellent photoluminescence behaviors as well as the superior transparency of over 97 % in the visible light region.

这项研究的重点是使用纤维素在离子液体（IL）中于65°C的低温下水解，无需另外处理即可制备碳点（CD）。通过TEM观察CD的形态。通过XPS，FT-IR，UV-vis和PL光谱对化学结构和光学性质进行了表征。由于纤维素在IL中孵育的时间更长，因此CD的尺寸减小了。此外，CD的核心同时被更多的氮掺杂了石墨N，导致量子产率提高到约33％。为了更容易地以固态方式应用CD，只需通过一锅法溶解即可简单地制备CD嵌入的纤维素膜。所制备的纤维素膜显示出优异的光致发光行为以及在可见光区域中超过97％的优异透明度。