We have used simple chemical route to synthesize delafossite silver ferrite (AgFeO2) nanoparticles (NPs). AgFeO2 NPs were utilized as Raman substrate for detection of Rhodamine 6G (R6G) molecules. AgFeO2 NPs substrate show excellent Surface‐enhanced Raman Scattering (SERS) activity, which enables ultrasensitive detection of R6G with a concentration down to 1 picomolar (1 pM) with an enhancement factor (EF) of 1.6×1010. The observed SERS signal enhancement in this AgFeO2 NPs system is attributed to a combination of electromagnetic (EM) enhancement, charge ‐ transfer (CT) effect between R6G analyte molecules and AgFeO2 NPs surface and Resonance Raman (RR) effect. Further, AgFeO2 NPs were used to study its antibacterial activity against certain different pathogenic bacteria. The antibacterial studies showed that the AgFeO2 NPs possesses potential inhibitory effect against both Gram‐negative and Gram‐positive bacteria. In addition, AgFeO2 NPs was found cytotoxic to yeast cells. The stable aqueous colloids of AgFeO2 NPs may find potential applications in the biomedical field as a sensing platform for the trace level detection of analyte molecules and antimicrobial agent.
In the present work, vanadium carbide (V 2 CT x ) MXene was synthesized successfully and then treated with an ammonia solution (NH 4 OH) under different pressures using a hydrothermal process. The sample morphology reveals that the V 2 CT x MXene gradually changed from uneven multilayered micrometre-size sheets to uniform few-layered nanometer-size sheets as the pressure increased. The optical emission spectra show broad emission and a blue shift due to nitrogen-related defects and quantum confinement. X-ray photoelectron spectroscopy shows the presence of nitrogen in all of the samples. The ultraviolet photoelectron spectroscopy study shows a modified density of states near the Fermi level and a maximum of ∼0.6 eV valence band edge shift towards a higher binding energy side after post-treatment with ammonia. More interestingly, the E 1g Raman band becomes degenerate and the E 1g band upshifts (∼15 cm −1 ) with increasing pressure treatment. The Raman results suggest that the induced lattice strain due to post-ammonia treatment plays a crucial role in deciding the optical and electronic properties.
A new family of two-dimensional (2D) materials called MXenes has gained attention recently owing to their fascinating physical and chemical properties.Herein, 2D vanadium carbide (V 2 C) MXene was mixed with cellulose nanocrystals (CNCs) to produce an environmentally friendly V 2 C/CNC composite.The V 2 C/CNC composite exhibited surface-enhanced Raman scattering (SERS) activity for the methylene blue (MB) dye with an enhancement factor of $9 Â 10 5 . Here, we have proposed that along with electromagnetic enhancement, the charge transfer process plays a vital role in the SERS enhancement. We believe that this work would open a new way to fabricate sustainable and renewable MXene and CNC composite solution-based SERS platforms for analyte detection.
In the present exploration, MXene (Ti 3 C 2 T x ) based composite polymer electrolytes (CPEs) are fabricated by electrospinning technique to make free-standing fiber films. In this process, four different composite polymer electrolytes (CPEs) are synthesized by varying the MXene content from 0 mg to 60 mg in poly-acrylonitrile (PAN) along with NaPF 6 solution. The electron microscopic studies reveal the layered morphology of synthesized MXene samples. Further, MXene based CPE fibers exhibit lengths of several micro-meters with widths < 3 μm. The linear sweep voltammetry results manifest the electrochemical stability of CPE S up to 3.3 V. The key studies in this research work are the incorporation of sodium-based salts which are more abundant, less expensive, less reactive, and environment friendly than other Li based salts, also the highlighted findings have been assigned to the impedance and the DC polarization, which illustrate the enhanced ionic conductivities (of the order of 10 À 6 S/cm) for the 20 mg MXene based CPE sample. Further, the Fourier Transform Infra-Red (FTIR) spectroscopy analysis and its deconvolution studies have been carried out, which depict the enhancement in the free ion concentration in the MXene based CPEs samples.
The oxygen evolution reaction (OER) plays a key role in various energy applications, and perovskite oxides have received significant interest in recent years as potential catalysts for the OER. Furthermore, magnetic field-enhanced electrocatalysis has emerged recently as a promising way to boost catalytic efficiency in magnetic materials. In the present work, YMnCrO 3 perovskite oxide nanostructures were synthesized, and their magnetic properties are altered by Cr doping in YMn 1−x Cr x O 3 (x = 0, 0.05, and 0.1). The magnetic hysteresis loop confirms the enhanced ferromagnetic exchange interaction with increasing Cr doping concentration. The highest ferromagnetic signal is observed in YMn 1−x Cr x O 3 (x = 0.1). More interestingly, the OER activities are significantly improved after doping of Cr in YMnO 3 . The improved OER activity under an applied magnetic field is related to the increase in the ferromagnetic exchange interaction after Cr doping.
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