Plastic Morphological Response to Spectral Shifts during Inorganic Phototropic Growth.

Autor: Hamann KR; Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States., Meier MC; Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States., Lewis NS; Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States.; Beckman Institute, California Institute of Technology, Pasadena, California 91125, United States., Carim AI; Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States.; Beckman Institute, California Institute of Technology, Pasadena, California 91125, United States.
Jazyk: angličtina
Zdroj: JACS Au [JACS Au] 2022 Apr 04; Vol. 2 (4), pp. 865-874. Date of Electronic Publication: 2022 Apr 04 (Print Publication: 2022).
DOI: 10.1021/jacsau.1c00588
Abstrakt: Plants exhibit phototropism in which growth is directed toward sunlight and demonstrate morphological plasticity in response to changes in the spectral distribution of the incident illumination. Inorganic phototropic growth via template-free, light-directed electrochemical deposition of semiconductor material can spontaneously generate highly ordered mesostructures with anisotropic, nanoscale lamellar features that exhibit a pitch proportional to the wavelength (λ) of the stimulating illumination. In this work, Se-Te films were generated via a two-step inorganic phototropic growth process using a series of narrowband light-emitting diode sources with discrete output wavelengths (λ 0 ≠ λ 1 ). Analogous to the plasticity observed in plants, changes in illumination wavelength from λ 0 to λ 1 resulted in morphological changes including feature branching, termination, and/or fusion along the growth direction. The interfacial feature pitch changed with the growth duration, in some cases in a notably nonmonotonic fashion, and eventually matched that obtained for growth using only λ 1 . Simulated morphologies generated by modeling light-material interactions at the growth interface closely matched the evolved structures observed experimentally, indicating that the characteristics of the optical stimulation produce the observed plastic response during inorganic phototropic growth. Examination of the interfacial electric field modulation for λ 1 illumination of simplified structures, representative of those generated experimentally, revealed the interfacial light scattering and concentration behavior that directed phototropic growth away from equilibrium, as well as the emergent nature of the phenomena that reestablish equilibrium.
Competing Interests: The authors declare no competing financial interest.
(© 2022 The Authors. Published by American Chemical Society.)
Databáze: MEDLINE
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