Supplementary Information
Highly Uniform and Reproducible Surface Enhanced Raman Scattering on Air-stable Metallic Glassy Nanowire Array Xue Liu, Yang Shao, Yao Tang and Ke-Fu Yao*
School of Materials Science and Engineering, Tsinghua University, Beijing, People’s Republic of China. Fax: +86 10 6277 0190; Tel: +86 10 6277 2292; E-mail:
[email protected]
S1
Fig. S1 (a) X-ray diffraction (XRD) spectrum and (b) differential scanning calorimetry (DSC) curve of the as-prepared Pd40.5Ni40.5P19.
Fig. S2 Scanning electron microscope (SEM) image of the anodic aluminum oxide (AAO) template. S2
Fig. S3 SEM image of a‐MGNWA without cropping.
Fig. S4 SEM images comparison of the uncoated and coated NWAs. (a) The SEM image of the uncoated NWA. (b) The SEM image of the coated with a thin organic membrane on the NWs tips.
Fig. S5 Raman mapping images of (a) the bands around 1650 cm-1, (b) around 1360 S3
cm-1 and (c) the corresponding Raman spectra with 10-6 M RhB. (Laser beam power of ~5 mW, laser beam diameter of ~0.75 μm, excitation wavelength of 514 nm, scan time of 20 s, field lens of 100 times, accumulation of 1 times, mapping area of 20 μm * 20 μm and detection step of 1 μm)
Fig. S6 Intensities of the peaks around 1648 cm-1 in the SERS spectra of 10-6 M RhB from 11 randomly selected positions on the coated a-type MGNWA. Table S1 The SERS signal intensities of the peaks of 1648 cm-1 using RhB with concertration from 10-5 M to 10-9 M. concertration (mol·L-1) -5
10 10-6 10-7 10-8 10-9
intensity (counts) 14031±133 6720±85 3020±27 1772±22 834±10
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