Nanomechanical properties of dip coated indium tin oxide films on glass

Nanomechanical properties of indium tin oxide (ITO) thin films dip coated from precursor sols of varying equivalent oxideweight percentage (wt.%) onto commercial soda lime silica (SLS) glass substrate were evaluated by nanoindentation technique at an ultralowload of 50 mu N. Itwas found that the increase in wt.% beyond 6 in the precursor sols, had an adverse effect on nanohardness and Young's modulus of the films. Moreover, relatively thicker triple layered film (about 240 nm) had inferior nanomechanical properties as compared to the single layered film. Interestingly, the ITO foam coating on SLS glass substrate had nanomechanical properties nearly as good as those of the single layered films. These observations are explained in terms of the relative differences in crystallinity, stiffness and elastic deformation ability of the films. (C) 2015 Elsevier B.V. All rights reserved

One-Dimensional BiFeO₃ Nanowire-Reduced Graphene Oxide Nanocomposite as Excellent Supercapacitor Electrode Material

In this work, we have reported a nanocomposite, composed of a BiFeO₃ nanowire and reduced graphene oxide (BFO-RGO), as an electrode material for a high-performance supercapacitor. A facile hydrothermal method was employed to prepare BFO-RGO nanocomposite. The electrochemical measurements were performed by cyclic voltammetry, galvanostatic charge/discharge measurements, and electrochemical impedance spectroscopy. The specific capacitance of the BFO-RGO nanocomposite was 928.43 F g^–1 at current density 5 A g^–1, which is superior to that of pure BiFeO₃. Additionally, this nanocomposite shows good cyclic stability, and ∼87.51% of specific capacitance is retained up to 1000 cycles. It also exhibits a high charge density of 18.62 W h kg^–1 when the power density is 950 W kg^–1. These attractive results suggest the potential of BiFeO₃ nanowire-RGO nanocomposite as an active material for the construction of a high-performance supercapacitor electrode. To the best of our knowledge, this is the first time the application of BiFeO₃ nanowire-RGO nanocomposite as a supercapacitor has been reported

Construction of Fluorine- and Piperazine-Engineered Covalent Triazine Frameworks Towards Enhanced Dual-Ion Positive Electrode Performance

Organic positive electrodes featuring lightweight and tunable energy storage modes by molecular structure engineering have promising application prospects in dual-ion batteries. Herein, a series of highly porous covalent triazine frameworks (CTFs) were synthesized under ionothermal conditions using fluorinated aromatic nitrile monomers containing a piperazine ring. Fluorinated monomers can result in more defects in CTFs, leading to a higher surface area up to 2515 m2 g−1 and a higher N content of 11.34 wt % compared to the products from the non-fluorinated monomer. The high surface area and abundant redox sites of these CTFs afforded high specific capacities (up to 279 mAh g−1 at 0.1 A g−1), excellent rate performance (89 mAh g−1 at 5 A g−1), and durable cycling performance (92.3 % retention rate after 500 cycles at 2.0 A g−1) as dual-ion positive electrodes.This is a manuscript of an article published as Wang, Tao, James Anthony Gaugler, Meijia Li, Bishnu Prasad Thapaliya, Juntian Fan, Liqi Qiu, Debabrata Moitra et al. "Construction of Fluorine‐and Piperazine‐Engineered Covalent Triazine Frameworks Towards Enhanced Dual‐Ion Positive Electrode Performance." ChemSusChem 16, no. 4 (2023): e202201219. DOI: 10.1002/cssc.202201219. Copyright 2022 Wiley-VCH GmbH. Posted with permission. DOE Contract Number(s): AC02-07CH11358; AC05-00OR22725

Synthesis and Microwave Absorption Properties of BiFeO₃ Nanowire-RGO Nanocomposite and First-Principles Calculations for Insight of Electromagnetic Properties and Electronic Structures

Here, we report a facile hydrothermal synthesis method to prepare BiFeO₃ nanowire-reduced graphene oxide (BFO-RGO) nanocomposites. The unique properties of 2-D reduced graphene oxide (RGO) and 1-D BiFeO₃ nanowires (BFO) were exploited to design nanocomposites to obtain high performing microwave absorber materials. The composite with 97 wt % BFO and 3 wt % RGO exhibited minimum reflection loss value of −28.68 dB at 10.68 GHz along with the effective absorption bandwidth (≥ −10 dB) ranging from 9.6 to 11.7 GHz when the absorber thickness was only 1.55 mm. First-principles calculations based on density functional theory (DFT) of BFO, graphene, and BFO-RGO nanocomposites were performed to obtain information about their electronic structures to interpret their complex permittivity and its derived properties. To the best of our knowledge, this is the first time investigations on microwave absorption properties of the BiFeO₃ nanowire and BFO-RGO nanocomposites have been reported, and this nanocomposite shows its potential to be used as a lightweight, high performing microwave absorber in the X-band region