A Bioinspired Ag Nanoparticle/PPy Nanobowl/TiO<sub>2</sub> Micropyramid SERS Substrate
Xin Li,
Florian Ion Tiberiu Petrescu,
Qupei Danzeng,
Haiyan Zhu,
Ying Li,
Gang Shi
Affiliations
Xin Li
Key Laboratory of Synthetic and Biotechnology Colloids, Ministry of Education; School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
Florian Ion Tiberiu Petrescu
Department of Mechanisms and Robots Theory, Bucharest Polytechnic University, 060042 Bucharest, Romania
Qupei Danzeng
Department of Tibetan medicine; University of Tibetan Medicine, Lhasa 540100, China
Haiyan Zhu
Key Laboratory of Synthetic and Biotechnology Colloids, Ministry of Education; School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
Ying Li
Key Laboratory of Synthetic and Biotechnology Colloids, Ministry of Education; School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
Gang Shi
Key Laboratory of Synthetic and Biotechnology Colloids, Ministry of Education; School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
In this paper, the micropyramid structure was transferred to the TiO2 substrate by soft imprinting. Then, the PPy nanobowls were assembled onto the surface of the TiO2 micropyramids through the induction of the PS template. Finally, a layer of Ag nanoparticles was deposited on the surface of PPy nanobowls to form a novel Ag nanoparticle/PPy nanobowl/TiO2 micropyramid SERS substrate. Its structure is similar to the bioinspired compound eyes. This substrate exhibited excellent antireflection, ultra-sensitivity, excellent uniformity, and recyclability. The concentration of R6G molecules can be detected as low as 10−9 mol/L, and the Raman enhancement factor can reach 3.4 × 105. In addition, the excellent catalytic degradation performance of the substrate ensures recyclability. This work proves that the micropyramid structure can be applied to other SERS materials besides silicon by the above methods, which broadens the selection range of composite SERS materials.
