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Confining Carbon Dots in Porous Wood: The Singlet Oxygen Enhancement Strategy for Photothermal Signal-Amplified Detection of Mn2+
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-11-24 , DOI: 10.1021/acssuschemeng.0c05352
Junxia Su 1 , Siyu Lu 2 , Jun Hai 1 , Kun Liang 1 , Tianrong Li 1 , Shihao Sun 1 , Fengjuan Chen 1 , Zhengyin Yang 1 , Baodui Wang 1
Affiliation  

Portable detection of highly toxic environmental pollutants has been recognized as the most efficient method, but it still faces challenges. Here, a new photothermal signal-amplified sensing platform based on a carbon dot (CD) photosensitizer anchored in porous wood was fabricated for ultrasensitive determination of Mn2+ using a thermometer as the signal output. The resulting CDs@wood photosensitization structure could inhibit the aggregation-induced quenching of CDs, thereby greatly improving the efficiency of singlet oxygen (1O2) production. The experiment result showed that the CDs@wood photosensitizer could generate threefold higher 1O2 generation efficiency than CDs alone upon the same light irradiation. High 1O2 generation efficiency improves the yield of oxidizing Mn(II) to Mn(III) at neutral pH, thereby drastically enhancing the capability of Mn(III) to oxidize 3,3′,5,5′-tetramethylbenzidine (TMB) and improving photothermal signal generation under 660 nm irradiation. The above photothermal signal changes can be easily captured by the portable thermometer. However, other divalent metal ions do not have this effect; thus, Mn(II) as low as 44.6 nM can be selectively detected. Our work highlights a strategy to design highly efficient oxygen photosensitizers by tailoring space distribution of CDs for portable and highly sensitive detection and other applications.

中文翻译:

限制多孔木材中的碳点:用于光热信号放大检测Mn 2+的单重态氧增强策略

便携式检测剧毒的环境污染物已被认为是最有效的方法,但仍然面临挑战。在此,制造了一种新的基于锚定在多孔木材中的碳点(CD)光敏剂的光热信号放大传感平台,用于使用温度计作为信号输出对Mn 2+进行超灵敏测定。最终的CDs @ wood光敏结构可以抑制CD的聚集诱导猝灭,从而大大提高了单线态氧(1 O 2)的生产效率。实验结果表明,CDs @ wood光敏剂可产生高出三倍的1 O 2。在相同的光照射下,其产生效率要比单独的CD高。1 O 2的高生成效率可提高在中性pH下将Mn(II)氧化为Mn(III)的产率,从而显着增强Mn(III)氧化3,3',5,5'-四甲基联苯胺(TMB)的能力并改善了660 nm照射下的光热信号产生。便携式温度计可以轻松捕获上述光热信号的变化。但是,其他二价金属离子则不具有这种作用。因此,可以选择性地检测出低至44.6 nM的Mn(II)。我们的工作重点介绍了通过调整CD的空间分布以设计便携式和高灵敏度检测及其他应用程序来设计高效氧气光敏剂的策略。
更新日期:2020-11-24
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