Suvarnaphaet Phitsini, Tiwary Chandra Sekhar, Wetcharungsri Jutaphet, Porntheeraphat Supanit, Hoonsawat Rassmidara, Ajayan Pulickel Madhavapanicker, Tang I-Ming, Asanithi Piyapong
Department of Physics, Faculty of Science, Mahidol University, Bangkok 10400, Thailand; ThEP Center, Commission of Higher Education, 328 Si Ayuthaya Rd, Thailand.
Department of Materials Science and Nano Engineering, Rice University, Houston, TX 7005, United States.
Mater Sci Eng C Mater Biol Appl. 2016 Dec 1;69:914-21. doi: 10.1016/j.msec.2016.07.075. Epub 2016 Aug 2.
Carbon-based photoluminescent nanodot has currently been one of the promising materials for various applications. The remaining challenges are the carbon sources and the simple synthetic processes that enhance the quantum yield, photostability and biocompatibility of the nanodots. In this work, the synthesis of blue photoluminescent carbon nanodots from limeade via a single-step hydrothermal carbonization process is presented. Lime carbon nanodot (L-CnD), whose the quantum yield exceeding 50% for the 490nm emission in gram-scale amounts, has the structure of graphene core functionalized with the oxygen functional groups. The micron-sized flake of the as-prepared L-CnD powder exhibits multicolor emission depending on an excitation wavelength. The L-CnDs are demonstrated for rapidly ferric-ion (Fe(3+)) detection in water compared to Fe(2+), Cu(2+), Co(2+), Zn(2+), Mn(2+) and Ni(2+) ions. The photoluminescence quenching of L-CnD solution under UV light is used to distinguish the Fe(3+) ions from others by naked eyes as low concentration as 100μM. Additionally, L-CnDs provide exceptional photostability and biocompatibility for imaging yeast cell morphology. Changes in morphology of living yeast cells, i.e. cell shape variation, and budding, can be observed in a minute-period until more than an hour without the photoluminescent intensity loss.
碳基光致发光纳米点目前已成为适用于各种应用的有前景的材料之一。剩下的挑战是碳源以及能提高纳米点量子产率、光稳定性和生物相容性的简单合成工艺。在这项工作中，展示了通过一步水热碳化工艺从酸橙汁合成蓝色光致发光碳纳米点。石灰碳纳米点（L-CnD）在克级规模下对于490nm发射的量子产率超过50%，具有由氧官能团官能化的石墨烯核心结构。所制备的L-CnD粉末的微米级薄片根据激发波长呈现多色发射。与Fe(2+)、Cu(2+)、Co(2+)、Zn(2+)、Mn(2+)和Ni(2+)离子相比，L-CnD被证明可用于快速检测水中的铁离子（Fe(3+)）。L-CnD溶液在紫外光下的光致发光猝灭用于肉眼区分低至100μM浓度的Fe(3+)离子与其他离子。此外，L-CnD为成像酵母细胞形态提供了出色的光稳定性和生物相容性。在一分钟到一个多小时的时间段内，可以观察到活酵母细胞形态的变化，即细胞形状变化和出芽，而不会有光致发光强度损失。
