Chemically co-doping a micron-sized semiconductor single crystal while simultaneously segregating different dopant types uniformly on a nanoscale is synthetically challenging, but often essential for preventing unwanted dopant-related interference that may hamper optic and magnetic applications. Here by starting from a unique molecular crystal composed of well-defined discrete supertetrahedral chalcogenide nanoclusters (NCs), we successfully realized highly effective nanosegregation of dual dopants (Cu and Mn) in Cd–In–S semiconductor crystals. Our method takes advantage of the intrinsic single vacancy at the core of NC that permits the trapping of only one dopant ion. Such single-ion trapping effectively precludes two dopant ions from residing in the same NC, allowing us to target single-crystal white-light emitter by eliminating possible interference between dopants. This new method for controlling the distribution of multiple dopants on a nanoscale provides a promising route to modify and tune optical and magnetic properties of large-sized semiconductor single crystals for use in integrated multifunctional devices.
Graphite and multiwall carbon nanotube (MWCNT) served as dual dopants to prepare the composite with poly (aniline- co - o -methoxyaniline) copolymer electrochemically. The aniline to o -methoxyaniline monomer feed ratio was screened, with 4 to 1 monomer ratio being optimal. The supercapacitive properties of the prepared dual dopant-doped composite as electrode materials have been investigated and yielded a large specific capacitance of 535.0 F/g under 1.0 A/g current density and showed excellent rate performance, even with large current densities applied (up to 50.0 A/g). The composite remained to give a relatively stable specific capacitance of more than 200.0 F/g after 500 galvanostatic charge-discharge cycles, which afforded better and/or comparable performance compared with other polyaniline-based composite. The composite’s morphological features were characterized with scanning electron microscopy. The results from this study will be significant for the development of conducting polymer-based energy storage materials.
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