拉曼散射
等离子体子
半导体
拉曼光谱
纳米技术
材料科学
光电子学
检出限
分析化学(期刊)
化学
光学
物理
色谱法
作者
Enduo Feng,Tingting Zheng,Xiaoxiao He,Jinquan Chen,Qingyi Gu,Xiao He,Fanghao Hu,Jinghong Li,Yang Tian
标识
DOI:10.1002/anie.202309249
摘要
Semiconductors demonstrate great potentials as chemical mechanism-based surface-enhanced Raman scattering (SERS) substrates in determination of biological species in complex living systems with high selectivity. However, low sensitivity is the bottleneck for their practical applications, compared with that of noble metal-based Raman enhancement ascribed to electromagnetic mechanism. Herein, a novel Cu2 O nanoarray with free carrier density of 1.78×1021 cm-3 comparable to that of noble metals was self-assembled, creating a record in enhancement factor (EF) of 3.19×1010 among semiconductor substrates. The significant EF was mainly attributed to plasmon-induced hot electron transfer (PIHET) in semiconductor which was never reported before. This Cu2 O nanoarray was subsequently developed as a highly sensitive and selective SERS chip for non-enzyme and amplification-free SARS-CoV-2 RNA quantification with a detection limit down to 60 copies/mL within 5 min. This unique Cu2 O nanoarray demonstrated the significant Raman enhancement through PIHET process, enabling rapid and sensitive point-of-care testing of emerging virus variants.
科研通智能强力驱动
Strongly Powered by AbleSci AI