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    Synthesis and Optical Properties of Cadmium Selenide Thin Films and Nanowires

    , M.Sc. Thesis Sharif University of Technology Kalhori, Hossein (Author) ; Iraji Zad, Azam (Supervisor) ; Dolati, Abolghasem (Supervisor)
    The interesting properties of metallic and semiconductor nanowires provide many applications in electronic and optoelectronic devices. In this project, we have synthesized Cu and CdSe nanowires using electrodeposition method. To adjust deposition bath conditions and characterize the structure of deposit first we prepared CdSe thin film on ITO substrates. The used solution was contained 0.1 M CdSO4+ 0.1 mM SeO2 in the acidic situation with pH=2.5. The best reduction potential was determined about -0.5 V. The XPS and XRD analyses showed that the ratio of cadmium to selenium in the films was 1:1 and the film’s structure is amorphous. Optical band gap of the cadmium selenide films was obtained... 

    Synthesis of Palladium Nanowires for Hydrogen Gas Sensor by Field Ionization

    , M.Sc. Thesis Sharif University of Technology dolatkhah, Naeme (Author) ; Irajizad, Azam (Supervisor)
    The interesting properties of metallic nanowires provide many applications in electronic sensors. In this project, we have synthesized Pd nanowires using electrodeposition method. These nanowires are useful for hydrogen sensors by measuring field ionization current in gas. In this project, Pd nanowires were synthesized by electrochemical deposition method in PCT template with 100 nm pore size. The used solution was contained 2mM PdCl2 + 0.1M HCl. The best reduction potential was determined about -0.2V and the best time for synthesizing nanowires was 7 minutes. Chronoampermetric diagrams showed four steps, capacitive current, growth in the holes, reaching to the surface of PCT and the growth... 

    Al doped ZnO NanoStructures by Electrodeposition & Solvothermal for Dye Sensitized Solar Cells Application

    , M.Sc. Thesis Sharif University of Technology Ghahary, Raheleh (Author) ; Taghavinia, Nima (Supervisor)
    ZnO semiconductor has a wide band gap (3.3eV) and high electron mobility, making it a possible candidate for an effective structure-based Dye-sensitized solar cell (DSSC) semiconductor. Efficiency of DSSC based on ZnO is lower than TiO2 due to its low chemical satability. It is well known that the energy conversion efficiency of DSSC depends on the electron transport in the photoelectrode so in this investigation we fabricated high transport photoelectrode by doping Al in ZnO nanostructures. DSSC based on Al doped and undoped ZnO nanosheet synthesized by electrochemical deposition. Current density-voltage (J-V) characterizations indicate that Al-doping in ZnO crystal structure increases... 

    , Ph.D. Dissertation Sharif University of Technology (Author) ; Aashuri, Hossein (Supervisor) ; Simchi, Abdolreza (Co-Advisor)
    We demonstrated efficient direct electron transfer from the enzyme glucose oxidase to vertically aligned gold nanorods with a diameter of ~160 nm and a length of ~2 μm that are covalently linkage to a 3-dimensional network of reduced graphene oxide nanosheets. The assembly can be prepared by a 2-step electrochemical procedure. This hybrid structure holds the enzyme in a favorable position while retaining its functionality that ultimately provides enhanced performance for enzymatic sensing of glucose without utilizing mediators. The nanorod assembly was applied to the voltammetric detection of glucose. Figures of merit include an electrochemical sensitivity of 12 µA⋅mM-1⋅cm-2 (obtained from... 

    Modification of Additively Manufactured Stainless Steel 316L Electrodes by Fe-Co-Ni Metal-Organic Framework and Gold Nanoparticle for Electrochemical Water Splitting and CO2 Reduction

    , M.Sc. Thesis Sharif University of Technology Mohammadnejad, Ali (Author) ; Simchi, Abdolreza (Supervisor)
    The processes of electrochemical water splitting and carbon dioxide reduction are among novel technologies that have gained attention for tackling climate change and global warming. Though, catalysts with fininancial justification for industrial utilization of these processes is still not available. In this study, a 3D-structured electrode of low-carbon 316 stainless steel, made by additive manufacturing, is modified with a trilayered metal-organic framework (MOF), with Iron, Cobalt, and Nickel metallic nodes and BDC-NH2 as the organic ligand, for water splitting. Also, the same steel electrode is modified with a single layered MOF, with Iron node and BDC-NH2 ligand, along with nanoparticles... 

    Removal of Micropollutants from Wastewater Using an Electrochemical Biomembrane Reactor

    , M.Sc. Thesis Sharif University of Technology Abbasi, Pezhman (Author) ; Ghasemian, Saloumeh (Supervisor) ; Ghobadinejad, Zahra (Co-Supervisor) ; Hamzehlouyan, Tayebeh (Co-Supervisor)
    One of the major environmental problems in recent years is the presence of micropollutants that cause many problems for the environment and living organisms. Diclofenac is one of the micropollutants and endocrine disruptors. Conventional treatment methods do not have the ability to effectively remove pharmaceutical pollutants and micro-pollutants, and finding a suitable approach to remove these pollutants is of great importance. In recent years, biological methods such as the use of enzymes and molds have received attention, but due to the relative removal of pollutants, these methods have been combined with membrane technology to improve the level of pollutant removal and increase the... 

    Experimental Investigation of Zinc Bromine Flow Batteries

    , M.Sc. Thesis Sharif University of Technology Moshakker, Hossein (Author) ; Molaei Dehkordi, Asghar (Supervisor)
    Given the necessity of energy storage in today's world, various technologies have been developed to expand energy storage systems on a large scale. Electrochemical-based technologies, due to their high efficiency, are among the most suitable energy storage systems that have attracted the attention of scientists and researchers. Rechargeable zinc bromine flow batteries are one of the most powerful candidates for next-generation energy storage due to their high energy density, lower material costs, deep discharge capability, non-flammable electrolytes, relatively long lifespan, and good reversibility. However, there are many challenges to improving the efficiency and stability of these...