SYNTHESIS AND CHARACTERIZATION OF NANOSCALE POLYMER FILMS GRAFTED TO METAL SURFACES.
Degree: PhD, Materials Science and Engineering, 2014, Clemson University
Anchoring thin polymer films to metal surfaces allows us to alter, tune, and control their biocompatibility, lubrication, friction, wettability, and adhesion, while the unique properties of the underlying metallic substrates, such as magnetism and electrical conductivity, remain unaltered. This polymer/metal synergy creates significant opportunities to develop new hybrid platforms for a number of devices, actuators, and sensors. This present work focused on the synthesis and characterization of polymer layers grafted to the surface of metal objects. We report the development of a novel method for surface functionalization of arrays of high aspect ratio nickel nanowires/micronails. The polymer 'grafting to' technique offers the possibility to functionalize different segments of the nickel nanowires/micronails with polymer layers that possess antagonistic (hydrophobic/hydrophilic) properties. This method results in the synthesis of arrays of Ni nanowires and micronails, where the tips modified with hydrophobic layer (polystyrene) and the bottom portions with a hydrophilic layer (polyacrylic acid). The developed modification platform will enable the fabrication of switchable field-controlled devices (actuators). Specifically, the application of an external magnetic field and the bending deformation of the nickel nanowires and micronails will make initially hydrophobic surface more hydrophilic by exposing different segments of the bent nanowires/micronails. We also investigate the grafting of thin polymer films to gold objects. The developed grafting technique is employed for the surface modification of Si/SiO2/Au microprinted electrodes. When electronic devices are scaled down to submicron sizes, it becomes critical to obtain uniform and robust insulating nanoscale polymer films. Therefore, we address the electrical properties of polymer layers of poly(glycidyl methacrylate) (PGMA), polyacrylic acid (PAA), poly(2-vinylpyridine) (P2VP), and polystyrene (PS) grafted to the Si/SiO2/Au microprinted electrodes. The polymer layers insulated under normal ambient conditions can display a significant increase in conductivity as the environment changes. Namely, we demonstrate that the in-plane electrical conductivity of the grafted polymer layers grafted to Au and SiO2 surfaces can be changed by at least two orders of magnitude upon exposure to water or organic solvent vapors. The conductive properties of all the grafted polymer films under study are also significantly enhanced with temperature increase. The observed phenomenon makes possible the chemical design of polymer nanoscale layers with reduced or enhanced sensitivity to anticipated changes in environmental conditions. Finally, we show that the observed effects can be used in a micron-sized conductometric-transducing scheme for the detection of volatile organic solvents. This research also includes the study of nanoscale-level actuation with grafted polymer films and polymer/gold nanoparticles systems-grafted composites. First, we investigate the nanoscale-level…
Advisors/Committee Members: Dr. Igor Luzinov, Dr. Stephen H. Foulger, Dr. O. Thompson Mefford, Dr. Scott M. Husson, Dr. Ruslan Burtovyy.
Subjects/Keywords: modification; nanoscale; Nickel; Gold; PGMA; polymer film; surface; Materials Science and Engineering
to Zotero / EndNote / Reference
APA (6th Edition):
Galabura, Y. (2014). SYNTHESIS AND CHARACTERIZATION OF NANOSCALE POLYMER FILMS GRAFTED TO METAL SURFACES. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/1300
Chicago Manual of Style (16th Edition):
Galabura, Yuriy. “SYNTHESIS AND CHARACTERIZATION OF NANOSCALE POLYMER FILMS GRAFTED TO METAL SURFACES.” 2014. Doctoral Dissertation, Clemson University. Accessed October 28, 2020.
MLA Handbook (7th Edition):
Galabura, Yuriy. “SYNTHESIS AND CHARACTERIZATION OF NANOSCALE POLYMER FILMS GRAFTED TO METAL SURFACES.” 2014. Web. 28 Oct 2020.
Galabura Y. SYNTHESIS AND CHARACTERIZATION OF NANOSCALE POLYMER FILMS GRAFTED TO METAL SURFACES. [Internet] [Doctoral dissertation]. Clemson University; 2014. [cited 2020 Oct 28].
Available from: https://tigerprints.clemson.edu/all_dissertations/1300.
Council of Science Editors:
Galabura Y. SYNTHESIS AND CHARACTERIZATION OF NANOSCALE POLYMER FILMS GRAFTED TO METAL SURFACES. [Doctoral Dissertation]. Clemson University; 2014. Available from: https://tigerprints.clemson.edu/all_dissertations/1300