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Nanoscale chemical transformations based on partial cation exchange reactions are known as a component-increased, shape-maintaining means for the design and tunable preparation of ternary or multinary metal chalcogenide compounds. Herein, we present a new material couple, BiS-AgBiS, to detail the binary-ternary chemical transformation via partial cation exchange and its reaction thermodynamics and kinetics. The preformed BiS nanorods (NRs) act as both the reactant and the parent template, within which the partial exchange of Bi with Ag cations proceeds under a silver-rich, diffusion-controlled regime, leading to the formation of energetically favorable AgBiS. The NR shape preservation involving sulfur sublattice rearrangement is due to the proper diameter thickness (∼12 nm) of parent BiS NRs and the rapid establishment of equilibrium-phase AgBiS, as supported by X-ray diffraction measurements and the pseudobinary AgS-BiS phase diagram. Interestingly, the finding of a AgBiS-BiS-AgBiS intermediate with axially segmented heterostructures reveals the real NR-to-NR conversion trajectory and the shape-induced exchange reaction anisotropy at the ends and middle of BiS NRs. Additionally, the resultant AgBiS NRs with a measured band gap of ∼0.86 eV exhibit potential for photoelectronic applications because of their impressive visible-near-infrared absorption and photoconductivity.
This article was published in the following journal.
Name: Inorganic chemistry
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High molecular weight insoluble polymers which contain functional anionic groups that are capable of undergoing exchange reactions with cations.
High molecular weight, insoluble polymers which contain functional groups that are capable of undergoing exchange reactions (ION EXCHANGE) with either cations or anions.
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A disorder characterized by recurrent focal onset seizures which have sensory (i.e., olfactory, visual, tactile, gustatory, or auditory) manifestations. Partial seizures that feature alterations of consciousness are referred to as complex partial seizures (EPILEPSY, COMPLEX PARTIAL).
Conditions characterized by recurrent paroxysmal neuronal discharges which arise from a focal region of the brain. Partial seizures are divided into simple and complex, depending on whether consciousness is unaltered (simple partial seizure) or disturbed (complex partial seizure). Both types may feature a wide variety of motor, sensory, and autonomic symptoms. Partial seizures may be classified by associated clinical features or anatomic location of the seizure focus. A secondary generalized seizure refers to a partial seizure that spreads to involve the brain diffusely. (From Adams et al., Principles of Neurology, 6th ed, pp317)
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