https://dspace.iiti.ac.in:8080/jspui/handle/123456789/12787 2026-05-12T17:09:55Z https://dspace.iiti.ac.in:8080/jspui/handle/123456789/15097 Title: TiO2, ZnO and Fe2O3 thin film nanomaterials: Preparation to applications Authors: Chaudhary, Archana Abstract: Nanomaterials have gained a lot of attention of scientists and researchers during the last two decades due to their small size (nano-scale) and large surface area. Amongst these nanomaterials, metal oxide thin film nanoparticles are gaining much more interest due to their exceptional chemical, electronic, catalytic, electrical and optical properties. These properties can be improved to develop essential functionalities and compositions that make them fit for various applications such as catalysts, solar cells, sensors, optoelectronic materials, and green energy storage applications. Thin film metal oxide nanoparticles can be synthesized by different physical or chemical methods like physical vapour deposition, chemical vapour deposition, atomic layer deposition, sol-gel synthesis and hydrothermal synthesis. The usual characterization techniques for metal oxide nanoparticles are SEM, HRTEM, EDX analysis, XRD, FTIR, XPS, and TGA-DTA etc. Many metal oxides like TiO2 and ZnO have excellent properties like photo-induced phenomenon under UV radiation and superconducting properties. Thus, their thin film nanoparticles can work more efficiently than the bulk one. This chapter explains about the synthesis of some metal oxides like TiO2, ZnO, and Fe2O3 through various physical and chemical methods, and the characterization and application of metal oxide thin film nanoparticles for solar cells, fuel cells, photovoltaic cells, optoelectronic application, and green energy storage application. © 2024, Bentham Books imprint. All rights reserved. 2024-01-01T00:00:00Z https://dspace.iiti.ac.in:8080/jspui/handle/123456789/12806 Title: MoS2/S@g-CN Composite Electrode for L-Tryptophan Sensing Authors: Chaudhary, Archana Abstract: L-tryptophan (L-TRP) is an essential amino acid responsible for the establishment and maintenance of a positive nitrogen equilibrium in the nutrition of human beings. Therefore, it is vital to quantify the amount of L-tryptophan in our body. Herein, we report the MoS2/S@g-CN-modified glassy carbon electrode for the electrochemical detection of L-tryptophan (L-TRP). The MoS2/S@g-CN composite was successfully synthesized using an efficient and cost-effective hydrothermal method. The physical and chemical properties of the synthesized composite were analyzed using powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and energy-dispersive X-ray analysis (EDX). The crystallite size of the composite was calculated as 39.4 nm, with porous balls of MoS2 decorated over the S@g-CN surface. The XPS spectrum confirmed the presence of Mo, S, O, C, and N elements in the sample. The synthesized nanocomposite was further used to modify the glassy carbon (GC) electrode (MoS2/S@g-CN/GC). This MoS2/S@g-CN/GC was used for the electrochemical detection of L-TRP using cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques. For the purpose of comparison, the effects of the scanning rate and the concentration of L-TRP on the current response for the bare GC, S@g-CN/GC, MoS2/GC, and MoS2/S@g-CN/GC were studied in detail. The MoS2/S@g-CN-modified GC electrode exhibited a rational limit of detection (LoD) of 0.03 µM and a sensitivity of 1.74 µA/ µMcm2, with excellent stability, efficient repeatability, and high selectivity for L-TRP detection. © 2023 by the authors. 2023-01-01T00:00:00Z