Synthesis of Ni nanofibers and thin films as sacrificial materials using electrospinning and electrodeposition, respectively - Transformation of Ni nanofibers to branched Te hollow nanofibers - Investigation of crystal structure and morphology for the sacrificial materials and the Te hollow na
Synthesis of Ni nanofibers and thin films as sacrificial materials using electrospinning and electrodeposition, respectively - Transformation of Ni nanofibers to branched Te hollow nanofibers - Investigation of crystal structure and morphology for the sacrificial materials and the Te hollow nanofibers - Synthesis of binary PbSe hollow nanofibers - Equipment set up for a gas sensing, thermoelectric and electrical properties characterization
Abstract▼
The overarching goal of the proposed work is to develop novel and cost effective synthesis methods to fabricate ultra-long hollow binary, ternary, and quaternary chalcogen and metal chalcogenide nanofibers with controlled composition, dimensions, morphology, crystallinity and crystal structure. The
The overarching goal of the proposed work is to develop novel and cost effective synthesis methods to fabricate ultra-long hollow binary, ternary, and quaternary chalcogen and metal chalcogenide nanofibers with controlled composition, dimensions, morphology, crystallinity and crystal structure. The structure-property relationship of the chalcogenides nanofibers, such as electric, sensing and thermoelectric properties will be investigated and evaluated for enhancement of nanodevice applications. To fabricate these compositionally complex nanofibers, various wet chemical and electrochemical synthesis methods including galvanic displacement reaction (GDR), topochemical transformation reaction (TR), cation exchange reaction (CER) and electrodeposition (ED) will be combine with electrospinning (ES) to form chalcogenide hollow nanofibers in manufacturable manner. To accomplish our aim, three objectives have been defined: 1. Synthesis of sacrificial nanofibers (i.e., Ni, Co and their alloys) by electrospinning with controlled morphology, dimensions, composition and crystal structure: Since the morphology, dimension and composition of metal chalcogenide nanofibers are dependent on sacrificial nanofibers. 2. Transformation of sacrificial metal nanofibers to chalcogen and metal chalcogenide nanofibers with controlled morphology, dimensions, composition and crystal structure by electrochemical and chemical methods. 3. Material characterization and device evaluation: Scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HR-TEM), selected area diffraction pattern (SAED), X-ray diffraction pattern (XRD) will be utilized to determine morphology, dimension, defect density, crystal structure and crystallinity. Electric properties such as temperature coefficient of resistance (TCR) and field effect transistor (FET) will be measured to determine thermal activation energy and carrier concentration and mobility. Thermoelectric properties, including electrical conductivity (σ), Seebeck coefficient (S) will be measured to determine power factor. Sensing properties including sensitivity, selectivity, response/recovery time will be determined.
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