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    Molecularly Functionalized Silicon Substrates for Orientation Control of the Microphase Separation of PS-b-PMMA and PS-b-PDMS Block Copolymer Systems
    (AMER CHEMICAL SOC, 2013) Borah, Dipu; Ozmen, Mustafa; Rasappa, Sozaraj; Shaw, Matthew T.; Holmes, Justin D.; Morris, Michael A.
    The use of block copolymer (BCP) thin films to generate nanostructured surfaces for device and other applications requires precise control of interfacial energies to achieve the desired domain orientation. Usually, the surface chemistry is engineered through the use of homo- or random copolymer brushes grown or attached to the surface. Herein, we demonstrate a facile, rapid, and tunable approach to surface functionalization using a molecular approach based on ethylene glycol attachment to the surface. The effectiveness of the molecular approach is demonstrated for the microphase separation of PS-b-PMMA and PS-b-PDMS BCPs in thin films and the development of nanoscale features at the substrate.
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    A Novel Electrochemical Sensor Based on Metal Ion Infiltrated Block Copolymer Thin Films for Sensitive and Selective Determination of Dopamine
    (AMER CHEMICAL SOC, 2019) Bas, Salih Zeki; Cummins, Cian; Selkirk, Andrew; Borah, Dipu; Ozmen, Mustafa; Morris, Michael A.
    An electrochemical sensor using copper oxide nanodots (CuO nanodots-ITO) developed from a block copolymer template is demonstrated for sensitive and selective determination of dopamine (DA). The current signal of CuO nanodots-ITO was linear with the concentration of DA in the range between 0.12 and 56.87 mu M (R = 0.9975) with a sensitivity of 326.91 mu A mM(-1) cm(-2) and a detection limit of 0.03 mu M. Furthermore, the anti-interference ability of the present sensor to possible interfering substances including ascorbic acid, uric acid, acetaminophen, epinephrine, hydrogen peroxide, phenol, catechol, hydroquinone, and some inorganic compounds has been investigated. Our work highlights the significance of using a bottom-up nanofabrication technique to create a robust and reliable dopamine sensor that has critical importance in neurological disorders.