室温驱动腐植酸钠基碳纳米簇用于荧光比色检测银离子和温度传感OA北大核心CSTPCD

Based on hydrogen bonding self-assembly strategy,hypotoxicity and water-soluble cyan fluorescent carbon nanoclusters(HAN-CNCs)were constructed to employ a highly-efficient green economy and room temperature synthesis method,which used ascorbic acid and high biocompatibility coal-based sodium humate with abundant hydroxy as raw materials.The as-prepared HAN-CNCs can be specifically quenched by Ag+at pH of 5.0,with a wide detection range(5.0-300 μmol/L)and a low detection limit of 27.5 nmol/L.It was found that Ag+can induce fluorescence static quenching of the HAN-CNCs,owing to the coordination interaction between Ag+and amine groups or carbonyl groups on the surface of HAN-CNCs.More interestingly,the colorimetric detection of Ag+could be additionally realized by visible color conversion(yellowish-rubricans)under the daylight lamp and the cyan fluorescence gradually changed to blue purple under the irradiation of an ultraviolet lamp.From this,the HAN-CNCs were employed in the fabrication portable test strip for colorimetry monitoring of Ag+via the green-blue(G/B)analysis.In addition,HAN-CNCs exhibit an excellent reversible thermal response in the range of 20-85℃and have potential as a temperature sensor.Furthermore,the HAN-CNCs exhibited a low biotoxicity and an excellent cell permeability when selectively detecting Ag+in living cells by fluorescence microscopy imaging,indicating that the sensing system can be effectively applied to assessing potential risks and health security.