A perspective on single molecule SERS: current status and future challenges.

By P. Etchegoin, E. L. Le Ru. Physical Chemistry, Chemical Physics - PCCP, 2008

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Nanogap-engineerable Raman-active nanodumbbells for single-molecule detection. (2010, background): “However, SERS-based single-molecule detection generally faces a problem with structural reproducibility, as particle structure and interparticle distance can markedly affect Raman signals and constructing robust SERS-active nanostructures still remains challengin”
Highly uniform and reproducible surface-enhanced Raman scattering from DNA-tailorable nanoparticles with 1-nm interior gap. (2011, background): “It is now believed that an enhancement factor (EF) value of 1 × 10 7 to 1 × 10 8 may be sufficient for single-molecule detectio”
Optical detection of single non-absorbing molecules using the surface plasmon resonance of a gold nanorod. (2012, background): “However, SERS-active sites are rare, ill-controlled, and the strong interaction perturbs molecules even more than labels do [20].”
Single-molecule surface-enhanced Raman spectroscopy. (2012, background): “These have been discussed in full length in past reviews (31, 58); accordingly, we summarize here only the most important features, with a particular emphasis on the latest developments.”
Surface-enhanced Raman spectroscopy (SERS): progress and trends (2012, background): “Within this section, some aspects of this discussion are briefly mentioned; for a detailed overview of this topic the reader is referred to the relevant literature [208, 223, 224].”