Biomimetic synthesis of Ag-coated glasswing butterfly arrays as ultra-sensitive SERS substrates for efficient trace detection of pesticides

• Guochao Shi,
• Mingli Wang,
• Yanying Zhu,
• Yuhong Wang,
• Xiaoya Yan,
• Xin Sun,
• Haijun Xu and
• Wanli Ma

Beilstein J. Nanotechnol. 2019, 10, 578–588, doi:10.3762/bjnano.10.59

• . China Faculty of science, Beijing University of Chemical Technology, Beijing 100029, P.R. China Department of Mathematics, NC State University, Raleigh, NC 276968205, USA 10.3762/bjnano.10.59 Abstract In this work, we report a biomimetic synthesis route of 3D Ag nanofilm/glasswing butterfly wing

• , showing its great potential application in biochemical sensing and food security. Keywords: Ag nanofilm; glasswing butterfly; pesticide; surface-enhanced Raman scattering (SERS); Introduction Surface-enhanced Raman scattering (SERS), an extension of conventional Raman spectroscopy, is a powerful

• previous reports [29][30]. We adopt a highly efficient route (as shown in Figure 1) using biomimetic synthesis to fabricate 3D Ag nanofilm/glasswing butterfly wing (Ag-G.b.) hybrids as SERS substrates. The wings of the glasswing butterfly (Haetera piera) have an interesting nanostructure that can serve as

Fast diffusion of silver in TiO₂ nanotube arrays

• Wanggang Zhang,
• Yiming Liu,
• Diaoyu Zhou,
• Hui Wang,
• Wei Liang and
• Fuqian Yang

Beilstein J. Nanotechnol. 2016, 7, 1129–1140, doi:10.3762/bjnano.7.105

• schematically illustrated in Figure 1. The pure TiO2 nanotubes are prepared by a simple two-step anodization process, and then a layer of Ag film is deposited on the top of the TiO2 nanotubes via sputtering magnetron. The heat treatment of the TiO2 nanotubes with Ag nanofilm leads to the formation of Ag@TiO2

• the pure TiO2 nanotubes, as demonstrated in Figure 2 and Figure 3. The outmost surface of the pure TiO2 nanotubes remained relatively clean and smooth. A Ag nanofilm of 230 ± 10 nm in thickness was deposited on top of the prepared pure TiO2 nanotube arrays. The pure TiO2 nanotube arrays with Ag

• nanofilm were heat-treated at three temperatures of 300, 400, and 500 °C in air for different periods of time. X-ray diffraction (XRD) was used to analyze the crystal structure of Ti and Ag in the heat-treated TiO2 nanotube arrays with Ag nanofilm. Figure 4 shows the XRD pattern of the TiO2 nanotube arrays