Taspika Melda, Permatasari Fitri Aulia, Nuryadin Bebeh Wahid, Mayangsari Tirta Rona, Aimon Akfiny Hasdi, Iskandar Ferry
Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung Jalan Ganesha 10 Bandung 40132 Indonesia
Department of Physics, UIN Sunan Gunung Djati Bandung Jl. A. H. Nasution 105 Bandung 40614 Indonesia.
RSC Adv. 2019 Mar 6;9(13):7375-7381. doi: 10.1039/c8ra09742a. eCollection 2019 Mar 1.
Liquid Carbon Dots (CDs) were successfully synthesized by hydrothermal method using urea and citric acid as raw materials. TEM images confirmed that the CDs have a spherical shape with a homogeneous distribution. The as-prepared liquid CDs could absorb ultraviolet (UV) and first near infra-red (NIR) window simultaneously. However, the photoluminescence (PL) of the liquid CDs was damaged by their quenching effect. To overcome this issue, the liquid CDs were dispersed in poly(vinyl) alcohol (PVA) to fabricate the composite film. Herein, the dual-peak absorption properties of the CDs/PVA composite films were investigated for the first time. The composite films could maintain the simultaneous UV and first NIR window absorption property even after being preheated up to 200 °C, implying that the structure of CDs was well retained during the transition from the liquid to films. Daylight treatment for seven days produced minimum changes in the UV-vis and PL spectra, which indicates that the CDs/PVA film has more stable optical properties than the liquid CDs.
以尿素和柠檬酸为原料，通过水热法成功合成了液态碳点（CDs）。透射电子显微镜（TEM）图像证实，碳点呈球形且分布均匀。所制备的液态碳点能够同时吸收紫外线（UV）和首个近红外（NIR）窗口光。然而，液态碳点的光致发光（PL）因猝灭效应而受损。为克服这一问题，将液态碳点分散在聚乙烯醇（PVA）中以制备复合膜。在此，首次研究了CDs/PVA复合膜的双峰吸收特性。即使在预热至200℃后，复合膜仍能保持同时吸收紫外线和首个近红外窗口光的特性，这意味着在从液态转变为薄膜的过程中，碳点的结构得到了很好的保留。经过七天的日光处理，紫外可见光谱和PL光谱的变化最小，这表明CDs/PVA膜比液态碳点具有更稳定的光学性能。
