Yang Huan, Han Changdao, Jiang Jie, Li Pei, Chen Liang
School of Physical Science and Technology, Ningbo University Ningbo 315211 China
State Key Laboratory of Surface Physics, Department of Physics, Fudan University Shanghai 200433 China.
RSC Adv. 2024 Apr 2;14(15):10749-10754. doi: 10.1039/d4ra00887a. eCollection 2024 Mar 26.
A new type of two-dimensional layered material, namely CN, has been fabricated by polymerization and recommended to have great potential in various applications such as the development of electronic devices or photo-detectors, due to its enhanced conductivity, electronegativity, and unique optical properties. Actually, most of the present research on CN is limited in the scope of theoretical calculation, while experimental research is blocked by inefficient synthesis with low purity and homogeneity. Here, we report an optimized efficient synthesis method of high-purity CN QDs in aqueous solution by polymerization of DAP with combined centrifugation and filtration of products, with the synthesis yield up to 33.1 ± 3.1%. Subsequently, the CN QDs have been used as novel metal ion probes exhibiting a sensitive fluorescent response to various metal ions including monovalent alkaline metals (Li, Na, and K), divalent alkaline-earth metals (Mg, Ca, and Sr), and multivalent transition metals (Cu, Co, Ni, and Au, Fe, Cr) due to the high electronegativity of the CN surface. Particularly, the fluorescent quenching response of Al, Ga, In, and Sc ions is significantly different from the fluorescent enhanced response of most other carbon-based QDs, which is promising for enriching the detection methods of these metal ions and beneficial to improve the accuracy of ion recognition.
一种新型的二维层状材料，即CN，已通过聚合制备出来，并因其增强的导电性、电负性和独特的光学性质，被认为在电子设备或光电探测器等各种应用中具有巨大潜力。实际上，目前关于CN的大多数研究都局限于理论计算范围，而实验研究则因合成效率低下、纯度和均匀性低而受阻。在此，我们报告了一种在水溶液中通过DAP聚合并结合产物离心和过滤来优化高效合成高纯度CN量子点的方法，合成产率高达33.1±3.1%。随后，由于CN表面的高电负性，CN量子点已被用作新型金属离子探针，对包括单价碱金属（Li、Na和K）、二价碱土金属（Mg、Ca和Sr）以及多价过渡金属（Cu、Co、Ni和Au、Fe、Cr）在内的各种金属离子表现出灵敏的荧光响应。特别地，Al、Ga、In和Sc离子的荧光猝灭响应与大多数其他碳基量子点的荧光增强响应有显著差异，这有望丰富这些金属离子的检测方法，并有助于提高离子识别的准确性。
