Spectra precision terramodel 9.60
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In order to determine the die nanoimprinting parameters, the glassy structure of the as-prepared sample was verified by X-ray diffraction (XRD) and then the T g and T x were indexed as 574 K and 666 K by differential scanning calorimetry (DSC), respectively. In present work, we report the preparation and demonstration of air-stable MGNWAs capable of serving as SERS substrates with high EF as well as excellent reproducibility by using a classic MG of Pd 40.5Ni 40.5P 19 as an example. What's more, Pd and Ni possess stable SERS activity when excited by different wavelengths of light 24. Pd 40.5Ni 40.5P 19 21, 23 is a classic MG composition and possesses wide supercooled liquid region (SCLR) as well as excellent anti-oxidation properties, which endows it excellent thermoplastic forming ability. Then it is possible to employ the MGNWAs for SERS detection. What's more, MGNWAs possess better mechanical properties as well as corrosion resistance than their crystal counterparts 20, 22, making them easy to be conserved and durable in application. Very recently, it was reported that with inexpensive templates such as anodic aluminum oxide (AAO), metallic glassy nanowire arrays (MGNWAs) can be prepared by nanoimprinting technique 18, 19, 20, 21, which is a rapid, controllable, green and one-step forming technology.
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Thermoplastic forming based die nanoimprinting of metallic glasses (MGs) could be a potential cheap way for mass production of metallic array nanostructures due to the net-shape forming abilities of MGs. In addition, the easy oxidation and sulfuration make the prepared SERS substrates hard to be stored 3. Preparation of SERS metallic array nanostructures with both high sensitivity and high reproducibility still remains difficult and costly for routine SERS detection. But the most used metallic array nanostructures preparation techniques, such as electron beam lithography, nanosphere lithography, focused ion beam pattering, vacuum evaporation and soft-lithography, are limited by the high costs, the enormous difficulties to extend to large scales or complicated preparation steps 7, 11, 12, 17. A number of efforts have been made to improve the reproducibility of metallic substrates, most notably metallic array nanostructures where the well-ordered distribution of hot spots endows them high reproducibility 5, 10, 11, 12, 13, 14, 15, 16. However, although very high EF can be achieved and several SERS substrates with signal relative standard deviation (RSD) less than 7% were reported 7, 8, 9, commonly used substrates based on metals, either prepared by corrosion or sol-gel methods, show very poor reproducibility with fluctuant EFs that may vary across several orders of magnitudes, which severely hinders the applications of SERS 6, 10, 11. Applicable SERS substrates require both high enhancement factor ( EF) and excellent spatial reproducibility 5, 6.
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By employing surface plasmon polariton resonance occurring in the vicinity of the metal surface, especially narrow nanogaps between sharp corners and edges of metallic nanostructures, namely “hot spots” 3, 4, 5, the sensitivity of SERS can reach single molecular level 3. Surface enhanced Raman scattering (SERS) provides a powerful non-destructive spectroscopy technique for such identification, which is comparable to single-molecule fluorescence spectroscopy but without suffering from rapid photobleaching 1, 2, 3. Detection of trace amounts of molecules is a longstanding challenge in catalysis, biology, biomedicine and molecular nanotechnology.