A hydrothermal route to water-stable luminescent carbon dots as nanosensors for pH and temperature
A hydrothermal route to water-stable luminescent carbon dots as nanosensors for pH and temperature
复制标题
水热法制备水稳定性发光碳点作为 pH 和温度纳米传感器
DOI：
10.1016/j.carbon.2014.10.035
复制
发表时间：
2015-02-01
期刊：
影响因子：
10.9
通讯作者：
Zhang, Chi
中科院分区：
文献类型：
--
作者：
Wang, Chuanxi;Xu, Zhenzhu;Zhang, Chi
碳点（cd）作为一类无重金属的荧光纳米材料，由于其高光吸收率、化学稳定性、生物相容性和低毒性等优点，近年来受到越来越多的关注。本文报道了一种在谷胱甘肽（GSH）存在下水热处理葡萄糖（glc）制备稳定CDs的简便方法。通过这种方法，CDs的形成和表面钝化同时进行，从而产生本征荧光发射。研究了反应温度、反应时间和GSH/glc投料比对CDs光致发光性能的影响。利用紫外可见光谱、光致发光、x射线光电子能谱、傅里叶变换红外能谱和透射电子显微镜对所制备的CDs进行了表征，分析了其结构信息和性质。基于稳态荧光发射光谱的明显温度依赖性，这些CDs可以用作pH传感器或多功能纳米测温装置，其在生理温度范围（15-60摄氏度）内变化很大。(C) 2014 Elsevier Ltd.。版权所有。
Carbon dots (CDs) as a class of heavy-metal-free fluorescent nanomaterials has drawn increasing attention in recent years due to their high optical absorptivity, chemical stability, biocompatibility, and low toxicity. Herein, we report a facile method to prepare stable CDs by hydrothermal treatment of glucose (glc) in the presence of glutathione (GSH). With this approach, the formation and the surface passivation of CDs are carried out simultaneously, resulting in intrinsic fluorescence emission. The influence of reaction temperature, reaction time and feed ratio of GSH/glc on the photoluminescence property of CDs is studied. The as-prepared CDs are characterized by UV-Vis, photoluminescence, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and transmission electron microscope, from which their structural information and property are interpreted. These CDs may be useful as pH sensors or as versatile nanothermometry devices based on the pronounced temperature dependence of their steady-state fluorescence emission spectra, which changes considerably over the physiological temperature range (15-60 degrees C). (C) 2014 Elsevier Ltd. All rights reserved.