Hybrid nanomaterials based on carbon nanotubes (CNTs) and nanofibers (CNFs) for electrocatalytic and biosensing application
- UNCG Author/Contributor (non-UNCG co-authors, if there are any, appear on document)
- Ziyu Yin (Creator)
- Institution
- The University of North Carolina at Greensboro (UNCG )
- Web Site: http://library.uncg.edu/
- Advisor
- Jianjun Wei
Abstract: As the field of materials science and engineering has become more well developed and advanced, the demand for highly functionalized materials with new characteristics for future purposes has risen. In particular, more and more new discoveries have merged from interdisciplinary into a central hub of hybrid nanomaterials and composites. Briefly, hybrid materials are a result of constituting with two or more components via formation of chemical and physical interactions, such as Van der Waal, hydrogen bonding, weak electrostatic interaction or covalent bonds. Herein, hybrid materials not only inherit some of merits and functions from those constituents, but also acquire some new physicochemical properties that were not present in individual components. Carbon based nanomaterials have attracted paramount attention in the materials and biosensor communities owing to a large number of their unique properties, including improved mechanical, electrical, thermal, biocompatibility and catalytic virtues. Among different allotropes of carbon ranged from 0D to 3D structures, 1D filamentous forms of carbon, in terms of carbon nanotubes (CNTs) and carbon nanofibers (CNFs), are very attractive materials for a broader research community, taking one of the striking advantages in their superior length to width ratio (>1,000) with a high specific area. Thus, there is an emerging opportunity to design and create multi-functional hybrid nanomaterials based on carbon nanomaterials with various organic/inorganic materials at the nanoscale or molecule level, exhibiting great potential in electronics, catalysis, sensors and energy conversion and storage. This dissertation includes three research thrusts using hybrid carbon nanomaterials. 1) We investigated the direct electrochemistry of glucose oxidase (GOx) entrapped into a single-wall carbon nanotubes (SWCNTs)-poly(ethylenimine) (PEI) matrix under presence of glucose. We found the direct electrochemistry and ET kinetics of the GOx were impacted by glucose and correlated to its concentration. This finding may offer a promising way for the development of reagentless or mediator-free glucose biosensors or biofuel cells. 2) We examined the synergistic effect of mingled binary metal oxide (MnO2/Co3O4) on well-aligned electrospun carbon nanofibers (WA-ECNFs) towards electrocatalytic oxidation of glucose and a non-enzymatic glucose sensor. The results demonstrate a superior electrocatalytic performance due to the nanostructure feature of the binary metal oxides interfaces. 3) We studied nitrogen dopant in ECNFs (NECNFs) for the nucleation of metal oxide nanoparticles (Co3O4) and exploited the electrochemical performance towards selective detection of dopamine. We found the N dopant could induce the nucleation and growth of cobalt oxide nanoparticles (nanograin morphology) via strong covalent coupling effect, sustaining improved catalytic effect in contrast to the smoothly deposited Co3O4 film without the N-dopant. The Co3O4@NECNFs electrode demonstrated rapid responsive and highly sensitive, in-situ, real-time monitoring dopamine secreted by living cells. In summary, the findings in this dissertation work present advanced knowledge associated with novel nanohybrid structures and the structure-property-performance. We hope this research can promote the development of new hybrid materials and composites, thereby benefiting our lives in human society. [This abstract has been edited to remove characters that will not display in this system. Please see the PDF for the full abstract.]
Hybrid nanomaterials based on carbon nanotubes (CNTs) and nanofibers (CNFs) for electrocatalytic and biosensing application
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Created on 5/1/2021
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Additional Information
- Publication
- Dissertation
- Language: English
- Date: 2021
- Keywords
- Biosensing, Carbon based nanomaterials, Electrocatalysis, Electron transfer, Hybrid materials
- Subjects
- Carbon nanotubes
- Carbon nanofibers
- Electrocatalysis
- Biosensors
- Charge exchange