Publication costs assisted by the National Science Foundation Esr spectra for the piperidine nitroxides 2,2,6,6-tetramethylpiperidine-IV-oxyl (TEMPO) and 2,2,6,6tetramethylpiperidine-IV-oxyl-4-ol (TEMPOL) in benzene have been obtained in which the proton hyperfine structure is partially resolved. Comparisons to spectra calculated for coupling constants inferred from prior nmr investigations confirm the proper hyperfine models for these two species. For TEMPO the magnetic nonequivalence of the axial and equatorial substituents at each position of the piperidine ring is averaged. This is not the case for TEMPOL, and INDO calculations indicate that the coupling constant of larger absolute magnitude at each position is associated with the equatorial substituent. Using the appropriate models the proton hyperfine envelope line widths are calculated as a function of the individual line width. The magnitude of the corrections necessary to obtain the true line width from the envelope width is greater for TEMPO and TEMPOL than for previously studied radicals of this type.
In this work, resonant infrared matrix-assisted pulsed laser evaporation (RIR-MAPLE), a novel deposition technique, was used to produce a transparent composite electrode of polyflourene (PFO) and two-dimensional (2D) Ti3C2Tx nanosheets, which are part of the broader MXene family of transition metal carbides and nitrides. This deposition technique offers a facile way to vary film composition in polymer/polymer and polymer/nanoparticle films. Through this method, composite PFO and MXene films were studied across six different compositions, enabling the identification of a film composition that exhibited excellent charge storage (above 10 mF/cm2) and transparency (over 75% transmittance) when used as a supercapacitor electrode material. Thus, RIR-MAPLE shows promise as a controllable and facile deposition technique for organic/inorganic composite films for use in transparent supercapacitors, as well as in other energy storage applications.
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