Solid-state fluorescent composite phosphor based on cellulose grafted with carbon dots for temperature sensing
Solid-state fluorescent composite phosphor based on cellulose grafted with carbon dots for temperature sensing
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DOI：
10.1039/c6ra14968e
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发表时间：
2016-09
期刊：
影响因子：
3.9
通讯作者：
Yaqin You;Haoran Zhang;Yingliang Liu;B. Lei
中科院分区：
文献类型：
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作者：
Yaqin You;Haoran Zhang;Yingliang Liu;B. Lei
首次用反相微乳液法制备了一种由纤维素和碳点组成的新型温度传感荧光粉。纤维素在高温下溶解在N-甲基吗啉-N-氧化物中，破坏了纤维素分子间的氢键，激活了羟基。同时，在这个过程中，一些羟基被逐渐氧化为羧基，从而有效地与表面被大量酰胺基团功能化的硫化镉反应。傅里叶变换红外光谱的结果证实了纤维素与硫化镉之间存在很强的相互作用，这是由于纤维素通过脱水缩合反应形成了碳-氮键。此外，复合荧光粉保持了单独的硫化镉的固有性质，并发射了450 nm的蓝光，但观察到了一个有趣的激发依赖现象。最后，研究了纤维素/硫化镉复合荧光粉在200~420K温度范围内的荧光特性，经线性拟合后，相关系数约为0.99，可望应用于温度传感。
A novel fluorescent phosphor consisting of cellulose and carbon dots (CDs) has been successfully prepared for temperature sensing by the inverse microemulsion method for the first time. Cellulose is dissolved in N-methylmorpholine-N-oxide at high temperature, which can destroy the hydrogen bonds among the cellulose molecules and activate hydroxyls. At the same time, some of the hydroxyl groups are gradually oxidized to carboxyl in this process, which effectively reacts with the CDs, whose surface is functionalized by lots of amide groups. The result from Fourier-transform infrared spectroscopy confirms that there is strong interaction between cellulose and the CDs due to the formation of carbon–nitrogen bonds through dehydration–condensation reactions. In addition, the composite phosphor retains the inherent properties of individual CDs and emits 450 nm blue light, however an interesting excitation dependent phenomenon is observed. Finally, the temperature dependent fluorescent properties of the cellulose/CDs phosphors have been investigated from 200 to 420 K. After liner fitting, the correlation coefficient is calculated to be about 0.99, thus this novel phosphor is expected to be applied in temperature sensing.