All Platinum Made Gap Mode Nanostructure for Surface Enhanced Raman Spectroscopy

作者：Shin Dongha^*

来源：Journal of Physical Chemistry C, 2016, 120(25): 13701-13705.

DOI：10.1021/acs.jpcc.6b02640

In SERS (surface enhanced Raman spectroscopy), platinum metal has been regarded as a relatively poor Raman enhancing substrate material compared to other coinage metals such as gold, silver, or copper, even though it has plenteous advantages in various catalyst or energy applications. Thanks to the recent realization of fabricating large-sized platinum nanoparticles, which have a higher extinction in the visible region, it became realized that the platinum nanoparticles can induce the surface enhanced Raman scattering signal on various macroscopically smooth novel metal substrates, such as gold and silver, with visible excitation. However, an all platinum made with reliable SERS enhancing structure has not been realized until now. Here, further, large-sized platinum nanoparticles can also induce SERS signal even at a smooth platinum substrate with use of the bifunctional linker molecule 1,4-phenylenediisocyanide (1,4-PDI). This all platinum made gap mode nanostructure exhibits the apparent SERS signal of 1,4-PDI, and its enhancement factor was compared experimentally with that of a silver nanoparticle planar platinum or gold nanoparticle planar platinum structure along with wavelength-dependent experiments. This result provides a deeper understanding of the recently attracted gap mode structure in SERS, and it has the potential to be utilized as a model structure for monitoring various platinum-based catalytic processes via Raman spectroscopy.

• 出版日期2016-6-30