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Afterglow-Assistant Surface-Enhanced Raman Scattering on Cr3+:ZnGa2O4@Au
The Journal of Physical Chemistry C ( IF 3.7 ) Pub Date : 2020-06-25 , DOI: 10.1021/acs.jpcc.0c03686
Jing-Yun Yang 1 , Ye Zhang 1 , Xia Ji 1 , He-Fang Wang 1
Affiliation  

Surface-enhanced Raman scattering (SERS) has been widely investigated in recent years. The subtle design and synthesis of SERS substrates, including the semiconductor–metal composites, are the key but difficult points. To date, only the short-lived semiconductors are involved, and no research has been conducted concerning the long-lived ones although the persistent luminescence semiconductors have great potential of charge transfer in relatively long durations. Herein, we present a concept of afterglow-assistant SERS (AASERS) on the long-lived gold shell-capped Cr3+-doped ZnGa2O4 (CZGO@Au) substrate. The normal SERS, AASERS acquired immediately after 2 min illuminating of a 633 nm laser, AA-1 min SERS acquired 1 min after 2 min illuminating of a 633 nm of the typical analytes on CZGO@Au, ZnGa2O4@Au (ZGO@Au), and gold nanostars (GNSs) with the same UV–vis absorption wavelength are systematically compared. The CZGO@Au owns the SERS signals that are 1.8 times of ZGO@Au and 3.4 times of GNSs. A higher AASERS than the corresponding SERS (1.65 times) is only observed on CZGO@Au, and the AASERS on CZGO@Au is 2.8 times of that on ZGO@Au and 5.2 times of that on GNSs. Because of the afterglow decay of CZGO@Au, the AA-1 min SERS on CZGO@Au returns to its SERS. These data demonstrate that the AASERS on long-lived substrates is a promising way for further enhancing SERS signals just by laser illuminating the substrates, and thus affords alternatives for reducing the difficulties in the complicated synthesis of the exquisite substrates. The AASERS mechanism and the application of CZGO@Au in SERS imaging of living U87MG cells are also discussed.

中文翻译:

Cr 3+:ZnGa 2 O 4 @Au上的余辉辅助表面增强拉曼散射

近年来,已对表面增强拉曼散射(SERS)进行了广泛研究。SERS基底(包括半导体-金属复合材料)的微妙设计和合成是关键但困难的方面。迄今为止,虽然持久发光半导体在相对长的时间内具有很大的电荷转移潜力,但仅涉及寿命短的半导体,并且尚未进行有关寿命长的半导体的研究。在此,我们提出了一种长寿命金壳包覆的Cr 3+掺杂ZnGa 2 O 4的余辉辅助SERS(AASERS)概念。(CZGO @ Au)基板。正常SERS,在633 nm激光照射2分钟后立即获得AASERS,AA-1 min在633 nm的典型分析物CZGO @ Au,ZnGa 2 O 4上照射633 nm 2分钟后,获得1S SERS系统地比较了@Au(ZGO @ Au)和具有相同的UV-vis吸收波长的金纳米星(GNS)。CZGO @ Au拥有的SERS信号是ZGO @ Au的1.8倍和GNS的3.4倍。仅在CZGO @ Au上观察到AASERS高于相应的SERS(1.65倍),CZGO @ Au上的AASERS是ZGO @ Au上的2.8倍和GNSs上的5.2倍。由于CZGO @ Au的余辉衰减,CZGO @ Au上的AA-1分钟SERS返回其SERS。这些数据表明,长寿命底物上的AASERS是仅通过激光照射底物来进一步增强SERS信号的有前途的方法,因此提供了减少复杂底物复杂合成中的困难的替代方法。还讨论了AASERS机制和CZGO @ Au在活U87MG细胞SERS成像中的应用。
更新日期:2020-06-25
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