TNAs/g-C3N4/AuNPs heterojunction used as integrated device of photocatalytic degradation and SERS detection

Xue, Wei; Han, Bo; Ma, Haojie; Hou, Xianhua; Wang, Ji‐Jiang; Li, Ran; Zhang, Yuqi

doi:10.1016/j.ceja.2022.100440

Cited by 2 publications

(1 citation statement)

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“…为了提高SERS灵敏度, 研究人员将等离激元金属与半导体纳米材料相结合, 形成等离激元金属/ 半导体异质结构型, 不仅具有等离激元金属产生的EM, 还具有半导体引起的CM [28] , 能够极大地提高SERS活性, 与纯金属或半导体相比具有显著优势 [29] . 例如, Yu等 [30] 设计了CuO/TiO 2 p-n异质结作为SERS衬底, 用于放大4-巯基苯甲酸(4-MBA) 分子的拉曼信号, 由于内部电场和异质结界面提供的强界面耦合提高了电荷收集能力并提高了 PICT, 最终实现了对于4-巯基苯甲酸(4-MBA)分子的超灵敏检测, 增强因子为 8.87×10 6 . Xue等 [31] 制作了一种新型的TNAs/g-C 3 N 4 /AuNPs异质结, 以CV作为探针分子, EF达到7.43×10 6 .…”

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Optimization of h-BN/Ag/Ag2O heterostructure by high temperature annealing and its surface-enhanced Raman scattering performance

Zheng,

Shi,

et al. 2023

Acta Phys. Sin.

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As a commonly used food additive, synthetic dyes are widely used in foods such as beverages, sweets and dairy products, and in the food processing process, excessive use of synthetic dyes may induce cell mutations, children's hyperactivity, genetic diseases and even cancer, posing a great threat to human health. As a fast, cheap, stable, ultra-sensitive and accurate detection method, SERS detection can reflect rich molecular fingerprint information through the vibration of the analyte, and accurately determine the trace amount of synthetic dyes in the actual environment. The metal/semiconductor heterostructure formed by the combination of plasmon metal and semiconductor is advantageous for the enhancement of photoinduced charge transfer efficiency (PICT), and has obvious advantages in the study of surface-enhanced Raman scattering. In this paper, the prepared hybrid substrate is annealed to further improve the surface-enhanced Raman scattering activity. Initially, high-density and monodisperse silver/silver oxide (Ag/Ag2O) nanoparticles were loaded onto two-dimensional hexagonal boron nitride (h-BN) nanosheets. On this basis, by annealing the system at high temperature, an efficient charge transfer channel is constructed, which greatly improves the PICT efficiency and chemical enhancement (CM). It was confirmed by experiments that the SERS signal intensity of h-BN/Ag/Ag2O material annealed at 320 ℃ with crystal violet (CV) as probe molecule was significantly increased by 18 times compared with unannealed material，enhancement factor (EF) reached 16.3145×107. Finally, based on the excellent SERS property of h-BN/Ag/Ag2O 320℃ annealing composite, the SERS detection of food additive patent Blue V (PBV) was conducted in this paper. The results showed that the lowest detection concentration could reach 10-12 M, and the trace detection of synthetic dye PBV was realized. It has excellent spatial uniformity and anti-interference ability, which is of great significance in the actual scene detection of PBV. The h-BN/Ag/Ag2O 320 ℃ annealed composite constructed in this paper has both physical and chemical enhancement, and has significant advantages in ultra-low sensitive SERS detection of food additives.

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