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A method of measuring the thermoelectric power of nano-heterostructures based on four-probe scanning tunneling microscopy is presented. The process is composed of the it in-situ fabrication of a tungsten-indium tip, the precise control of the tip-sample contact and the identification of thermoelectric potential. When the temperature of the substrate is elevated, while that of the tip is kept at room temperature, a thermoelectric potential occurs and can be detected by a current-voltage measurement. As an example of its application, the method is demonstrated to be effective to measure the thermoelectric power in several systems. A Seebeck coefficient of tens of μV/K is obtained in graphene epitaxially grown on Ru (0001) substrate and the thermoelectric potential polarity of this system is found to be the reverse of that of bare Ru (0001) substrate. 相似文献
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The molecular thin films of Rose Bengal (RB) embedded in polymethyl
methacrylate matrix are fabricated by using the spin-coating
technique. The macroscopic current--voltage (I--V) characterization
of the film shows that the RB molecule has two conductance switching
states with a high ON/OFF ratio in ambient conditions. The infrared
spectra indicate that intermolecular hydrogen bonds can form in the
RB thin films after their hydrolysis in air. With the
first-principles calculations, we demonstrate that the hydrogen
bonds will be destroyed in concomitance with the conformational
change when the RB molecule switches to its high-conductance state
after applying a voltage. 相似文献