Seebeck Coefficients of Some Molecule-Nanoparticle Assembled Structures Influenced by Pressure of Gases
Shien-Der Tzeng (曾賢德)1*, I-Chih Ni (倪懿池)1, Yi-Shan Li (李乙珊)1, You-Rong Hsieh (謝侑融)1
1Department of Physics, National Dong Hwa University, Hualien, Taiwan
* presenting author:Shien-Der Tzeng,
Molecule-nanoparticle assembled structures consisted of surface molecules and metal nanoparticles had attracted much attention for scientists because of their wide potential for applications. Many electrical, optical, and plasmonic properties of these nano-structures are tunable and could be controlled by their surface molecules. Recent years, thermoelectric properties of (single) molecule junctions had been measured by using scanning probe microscope (SPM) methods. However, it is more convenient to form abundant molecule junctions for further applications using such molecule-nanoparticle assembled structures. In this report, we show some results on thermoelectric properties of molecule-nanoparticle assembled structures. Many kinds of surface molecules, such as heme (原血紅素), hematin (豬血紅素), and 6-mercaptohexanoic acid (MHA), were studied. We found that the Seebeck coefficients S of these samples were sensitive to the pressure (from about 1E-5 to 400 Torr) of gases (such as N2, O2, CO, CO2, and Ar gases). It may be explained by the change of local density of state of surface molecule junctions influenced by gas adsorption. These results would be useful for future studies on molecule-nano devices.

Keywords: Thermoelectric, Molecule Junction, Nanoparticle, Assembly