15 research outputs found
Transport properties of copper phthalocyanine based organic electronic devices
Ambipolar charge carrier transport in Copper phthalocyanine (CuPc) is studied
experimentally in field-effect transistors and metal-insulator-semiconductor
diodes at various temperatures. The electronic structure and the transport
properties of CuPc attached to leads are calculated using density functional
theory and scattering theory at the non-equilibrium Green's function level. We
discuss, in particular, the electronic structure of CuPc molecules attached to
gold chains in different geometries to mimic the different experimental setups.
The combined experimental and theoretical analysis explains the dependence of
the mobilityand the transmission coefficient on the charge carrier type
(electrons or holes) and on the contact geometry. We demonstrate the
correspondence between our experimental results on thick films and our
theoretical studies of single molecule contacts. Preliminary results for
fluorinated CuPc are discussed.Comment: 18 pages, 16 figures; to be published in Eur. Phys. J. Special Topic
A van der Waals heterostructure of MoS\u2082/MoSi\u2082N\u2084 : a first-principles study
Prediction of two-dimensional bismuth-based chalcogenides Bi\u2082X\u2083(X = S, Se, Te) monolayers with orthorhombic structure : a first-principles study
A Dirac-semimetal two-dimensional BeN4 : thickness-dependent electronic and optical properties
Surface modification of titanium carbide MXene monolayers (Ti\u2082C and Ti\u2083C\u2082) via chalcogenide and halogenide atoms
Electronic and magnetic properties of two-dimensional of FeX (X = S, Se, Te) monolayers crystallize in the orthorhombic structures
MoSi\u2082N\u2084 single-layer : a novel two-dimensional material with outstanding mechanical, thermal, electronic and optical properties
Adsorption of habitat and industry-relevant molecules on the MoSi\u2082N\u2084 monolayer
Novel two-dimensional AlSb and InSb monolayers with a double-layer honeycomb structure : a first-principles study
Levoglucosenone-derived synthesis of bio-based solvents and polyesters
Polyesters are important materials with a wide range of applications, but there has been increasing concern over their sustainability. One example is the need for safer, bio-derived solvents to replace those currently in use for the polymer’s synthesis and processing. In this work, several variants of the bio-based cellulose/levoglucosenone derived solvent Cyrene, namely the ketal derivatives dioxolane Cygnet, dioxane Cygnet and dioxepane Cygnet were synthesized and tested as media for enzymatic polycondensation reactions using bio-based building blocks. Dioxolane Cygnet and dioxepane Cygnet were found to be suitable solvents for enzymatic polycondensation reactions, with dioxolane Cygnet being the preferred solvent, yielding polymers with a Mn >22 kDa. In addition, these solvents were tested in the biocatalyzed synthesis of levoglucosenone-based polyesters. The alternative solvents gave superior yields to those previously observed, demonstrating the versatility of these solvents in enzymatic polycondensation reactions, representing the first synthetic polymer-solvent system fully derived from cellulose