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29. Nellist PD, Pennycook SJ: The principles and interpretation of annular dark-field Z-contrast imaging. In Advances in Imaging and Electron Physics, Volume 113. Edited by: Peter WH. Amsterdam: Elsevier; 2000:147–203.CrossRef 30. Stephen J, Pennycook PDN: Scanning Transmission Electron Microscopy: Imaging and Analysis. Heidelberg: Springer; 2011. 31. Zhang S, Froyen S, Zunger A: Surface dimerization induced CuPt B versus CuPt A ordering of GaInP alloys. Appl Phys Lett 1995, 67:3141–3143.CrossRef Competing interests The authors declare that they have no competing interests. Authors’ contributions FB designed and grew the sample and wrote the MBE growth sections. CH carried out the PL study and wrote the PL discussion section. JPRD supervised

the PL analysis and interpretation of the energy transitions. DFR and AS acquired TEM data, carried out the analysed of results and drafted the manuscript. DG and DS designed the TEM studies, supervised the TEM analyses and participated Methane monooxygenase in the draft of the manuscript. All authors read and approved the final manuscript.”
“Background Raman spectroscopy is a powerful and label-free tool for identifying molecular species because the signals of re-emitted Raman photons address for all molecular species and correspond to a particular set of vibration modes. However, the Raman signal is very weak because Raman scattering is an inelastic scattering process of photon, only one in every 107 photon incidence on a molecule undergoing Raman scattering, and it has a second-order dipole transition nature. Fortunately, it was discovered that the signals of Raman scattering could be amplified enormously by molecules contacting with a textured or patterned special noble metal surface, termed as surface-enhanced Raman scattering (SERS) [1, 2]. Commonly, the origins of this enhancement [3–6] are believed to have contributions from both electromagnetic enhancement (EM) and chemical enhancement mechanisms.

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