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1. Strain and Substrate-Induced Electronic Properties of Novel Mixed Anion-Based 2D ScHX2 (X = I/Br) Semiconductors

Author

Ashima Rawat and Ravindra Pandey

Subjects
CBM, VBM, heterostructure, band gap, Chemistry, QD1-999
Abstract

Exploration of compounds featuring multiple anions beyond the single-oxide ion, such as oxyhalides and oxyhydrides, offers an avenue for developing materials with the prospect of novel functionality. In this paper, we present the results for a mixed anion layered material, ScHX2 (X: Br, I) based on density functional theory. The result predicted the ScHX2 (X: Br, I) monolayers to be stable and semiconducting. Notably, the electronic and mechanical properties of the ScHX2 monolayers are comparable to well-established 2D materials like graphene and MoS2, rendering them highly suitable for electronic devices. Additionally, these monolayers exhibit an ability to adjust their band gaps and band edges in response to strain and substrate engineering, thereby influencing their photocatalytic applications.

Published
2024
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2. Nano-hives for plant stimuli controlled targeted iron fertilizer application

Author

Vijayakumar Shanmugam, Kamaljit Kaur, Monika Singh, Ashima Rawat, Abir De Sarkar, and Pulkit Bindra

Subjects
General Chemical Engineering, Bicarbonate, 02 engineering and technology, General Chemistry, Mesoporous silica, 010402 general chemistry, 021001 nanoscience & nanotechnology, Ferric-chelate reductase activity, 01 natural sciences, Industrial and Manufacturing Engineering, 0104 chemical sciences, Iron powder, Chitosan, chemistry.chemical_compound, chemistry, Chemical engineering, Environmental Chemistry, Carbonate, Iron deficiency (plant disorder), 0210 nano-technology, Mesoporous material
Abstract

In spite of iron being an abundant element present in soil, often crops show iron deficiency, because it is not present in phyto-available forms. External application is also not successful, because of soil carbonate/bicarbonate ions assisted conversion into unavailable oxy hydroxyl forms. Here the chitosan coating on iron powder loaded mesoporous silica have been found to control the above undesired soil reaction. The coating acts as gate, which close the pores in the presence of carbonate ions to keeps the iron in phyto-available forms, whereas open the pores in the presence of the uptake proton signal from the roots. This phenomenon of excellent control in the nutrient supply to plant is a complementary effect of the pH responsive chitosan and the mesoporous channel. Because in the absence of either of the component, the performance is reduced. In the tomato plant experiment, the ferric chelate reductase activity, an iron deficiency parameter, is reduced by ~20% in plants treated with FeSO4@MS@CH compared to the one treated with FeSO4@MS.

Published
2019

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