Xie, Zuoti; Diez Cabanes, Valentin; Van Nguyen, Quyen; Rodriguez-Gonzalez, Sandra; Norel, Lucie; Galangau, Olivier; Rigaut, Stephane; Cornil, Jerome; Frisbie, C. Daniel published their research in ACS Applied Materials & Interfaces on December 1 ,2021. The article was titled 《Quantifying Image Charge Effects in Molecular Tunnel Junctions Based on Self-Assembled Monolayers of Substituted Oligophenylene Ethynylene Dithiols》.HPLC of Formula: 74029-40-6 The article contains the following contents:
A number of factors contribute to orbital energy alignment with respect to the Fermi level in mol. tunnel junctions. Here, we report a combined exptl. and theor. effort to quantify the effect of metal image potentials on the HOMO to Fermi level offset, εh, for mol. junctions based on self-assembled monolayers (SAMs) of oligophenylene ethynylene dithiols (OPX) on Au. Our exptl. approach involves the use of both transport and photoelectron spectroscopy to extract the offsets, εhtrans and εhUPS, resp. We take the difference in these quantities to be the image potential energy eVimage. In the theor. approach, we use d. functional theory (DFT) to calculate directly eVimage between pos. charge on an OPX mol. and the neg. image charge in the Au. Both approaches yield eVimage ~-0.1 eV per metal contact, meaning that the total image potential energy is ~-0.2 eV for an assembled junction with two Au contacts. Thus, we find that the total image potential energy is 25-30% of the total offset εh, which means that image charge effects are significant in OPX junctions. Our methods should be generally applicable to understanding image charge effects as a function of mol. size, for example, in a variety of SAM-based junctions. In the experiment, the researchers used 1,4-Diethynyl-2,5-dimethoxybenzene(cas: 74029-40-6HPLC of Formula: 74029-40-6)
1,4-Diethynyl-2,5-dimethoxybenzene(cas: 74029-40-6) belongs to ethers.Ethers do have nonbonding electron pairs on their oxygen atoms, and they can form hydrogen bonds with other molecules (alcohols, amines, etc.) that have O―H or N―H bonds. HPLC of Formula: 74029-40-6 The ability to form hydrogen bonds with other compounds makes ethers particularly good solvents for a wide variety of organic compounds and a surprisingly large number of inorganic compounds.
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem