拉曼散射
纳米纤维素
材料科学
光催化
基质(水族馆)
异质结
亚甲蓝
氧化剂
纤维素
化学工程
拉曼光谱
半导体
纳米技术
还原剂
光电子学
化学
有机化学
光学
地质学
工程类
催化作用
物理
海洋学
作者
Yi Luo,Lida Xing,Chuanshuang Hu,Weiwei Zhang,Xiuyi Lin,Jin Gu
标识
DOI:10.1016/j.ijbiomac.2022.02.102
摘要
Semiconductor metal-oxide/metal heterostructures with synergetic properties have potential applications in photocatalysis and optical sensors. Here, Cu2O sub-micro cubes were synthesized under environmentally benign conditions using 2, 2, 6, 6-tetramethylpyperdine-1-oxyl (TEMPO)-oxidized cellulose nanofibrils as a reducing and stabilizing agent. Then the surface of the Cu2O cubes was decorated with silver nanoparticles (AgNPs) by a substitution reaction. The Cu2O/Ag heterostructures within the cellulose nanofibrils (CNFs) network were employed as a promising surface-enhanced Raman scattering (SERS) assay for efficient sensing of methylene blue (MB), reaching a maximum enhancement factor (EF) of 4.0 × 104. Their SERS intensities depended on the coverage density of AgNPs and the wavelength of the excitation laser. The excellent SERS performance may result from the charge transfer between Ag and Cu2O molecules and the strong electromagnetic field at the interface. The CNF-Cu2O/Ag substrates were capable of detecting MB dye down to 10-8 M level with a relative standard deviation of 10-15%, demonstrating great sensitivity and reproducibility.
科研通智能强力驱动
Strongly Powered by AbleSci AI