Highly luminescent nitrogen-doped carbon quantum dots as effective fluorescent probes for mercuric and iodide ions

作者：Li, Zi; Yu, Huijun; Bian, Tong; Zhao, Yufei; Zhou, Chao; Shang, Lu; Liu, Yanhui; Wu, Li-Zhu; Tung, Chen-Ho; Zhang, Tierui^*

来源：Journal of Materials Chemistry C, 2015, 3(9): 1922-1928.

DOI：10.1039/c4tc02756f

• LABEL-FREE DETECTION
• SELECTIVE DETECTION
• SENSITIVE DETECTION
• SENSING PLATFORM
• POLYMER NANODOTS
• FACILE SYNTHESIS
• GREEN SYNTHESIS
• GRAPHENE
• HG2+
• NANOPARTICLES

Nitrogen-doped carbon quantum dots (N-CQDs) with strong blue fluorescence and a high quantum yield of 66.8% were synthesized via a facile one-pot hydrothermal treatment with ammonium citrate and ethylenediamine as carbon and nitrogen sources, respectively. The blue fluorescence emission is independent of the excitation wavelengths and is very stable in a wide pH range. These N-CQDs, dispersed well in water and other polar solvents, showed a highly selective and sensitive detection of hazardous and toxic Hg2+ in the range of 10 nM to 20 mu M through a fluorescence quenching process. The N-CQDs quenched by Hg2+ exhibited high selectivity and sensitivity for I- in the range of 0.5 mu M to 40 mu M via a fluorescence recovery process. A possible charge transfer process responsible for the effective detection was proposed according to the UV-vis absorption and fluorescence decay measurements.

• 出版日期2015
• 单位中国科学院理化技术研究所; 北京化工大学; 中国科学院大学