Date of Award
Chemistry and Biochemistry
This first half of the thesis reports the synthesis of new branched symmetric dithiophosphinic acids (DTPAs), and the formation and characterization of DTPA SAMs on As-Dep and TS gold. Chapter 1 introduces the definition of self-assembled monolayers (SAMs) and SAMs with multidentate adsorbates. The binding of DTPA SAMs on gold depends on the roughness of gold: on as-deposited (As-Dep) gold, DTPA adsorbates bind in a mixture of bidentate (60%) and monodentate (40%), while on templated-stripped (TS) gold, the SAMs chelated to the gold surface. Chapter 3 investigates packing density, organization of alkyl chain and chain crystallinity of (C6C2)2DTPA and (C5C1)2DTPA SAMs on As-Dep and TS gold. The second half of the thesis focused on the research area of stretchable electronics. Chapter 2 presents the background and application of stretchable electronics and different ways that have been used to increase the stretchability and conductivity of stretchable electronics, such as conductive materials, soft substrates and topographies of substrates. Chapter 4 reports the using of E-Beam evaporation to deposit Au thin film onto polydimethyl siloxane (PDMS) elastomeric substrates, by inducing micro-structured modified fumed silica interlayer to enhance the stretchability and conductivity of the thin metal films. Also, by simply altering the weight ratio of modified silica:PDMS interlayer, the resistance change can be tuned, which leads to different functional samples.
Xu, Jincheng, "Studies of Branched Dialkyldithiophosphinic Acids on Gold and Stretchable Gold Films Using Silica Nanoparticles" (2017). Electronic Theses and Dissertations. 5920.