3:45 PM - 4:00 PM
△ [21p-W631-9] Site-selective and single-molecule spectroscopy for single-molecule electronics
Keywords:Site-selection,Single-molecule spectroscopy,Single-molecule junction
Adsorption sites of molecules critically determine the electric/photonic properties and its stability of heterogeneous molecule-metal interfaces. Then, selectivity of adsorption site is essential for development of the fields including organic electronics, catalysis, and biology. However, due to current technical limitations, site-selectivity remains a major challenge because of difficulty in precise selection of meaningful one among the sites.
In this report, we present the site-selective characterization of an individual 1,4-benzenedithiol (BDT) molecule wired between two Au electrodes through simultaneous surface enhanced Raman scattering (SERS) and current-voltage (I-V) measurements. The electrical studies reveal the existence of three meta-stable states with individual conductivity arising from different molecular adsorption sites. Each three adsorption sites of the BDT molecule has three different conductivities with more than twenty times difference together.
An uncontrollable issue is that these three states randomly appear in the junction causing the three electric properties. Then, it has been widely believed that the electric property of molecular junction can be simply determined by chance because of the random formation of the molecular site among the multiple states.
Here, we like to propose the correlated spectroscopic measurements to selectively take the solo adsorption site “bridge sites” among three possible sites. This is the first report of a site-selective technique, opening the door towards the reliable integration of molecular components into a working device. Furthermore, this hybrid spectro-electrical technique has experimentally unveiled the SERS intensity on the strength of the metal-molecule interaction, showing the interdependence between the optical and electronic properties in single-molecule junctions.
In this report, we present the site-selective characterization of an individual 1,4-benzenedithiol (BDT) molecule wired between two Au electrodes through simultaneous surface enhanced Raman scattering (SERS) and current-voltage (I-V) measurements. The electrical studies reveal the existence of three meta-stable states with individual conductivity arising from different molecular adsorption sites. Each three adsorption sites of the BDT molecule has three different conductivities with more than twenty times difference together.
An uncontrollable issue is that these three states randomly appear in the junction causing the three electric properties. Then, it has been widely believed that the electric property of molecular junction can be simply determined by chance because of the random formation of the molecular site among the multiple states.
Here, we like to propose the correlated spectroscopic measurements to selectively take the solo adsorption site “bridge sites” among three possible sites. This is the first report of a site-selective technique, opening the door towards the reliable integration of molecular components into a working device. Furthermore, this hybrid spectro-electrical technique has experimentally unveiled the SERS intensity on the strength of the metal-molecule interaction, showing the interdependence between the optical and electronic properties in single-molecule junctions.