Ian Ivar Suni

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A new type of nanopore sensor design is reported for a reagent-less electrochemical biosensor with no analyte "tagging" by fluorescent molecules, nanoparticles, or other species. This sensor design involves immobilization within Au-coated nanopores of bacterial periplasmic binding proteins (bPBP), which undergo a wide-amplitude, hinge-twist motion upon(More)
Amplification of the electrochemical impedance and capacitance signals in a biosensor is demonstrated for the model fluorescein/anti-fluorescein system. Following immobilization of fluorescein onto Au through formation of a self-assembled monolayer, goat anti-fluorescein conjugated with 10-nm Au nanoparticles is introduced into the system. This results in(More)
Due to their all-electrical nature, impedance biosensors have significant potential for use as simple and portable sensors for environmental studies and environmental monitoring. Detection of two endocrine-disrupting chemicals (EDC), norfluoxetine and BDE-47, is reported here by impedance biosensing, with a detection limit of 8.5 and 1.3 ng/mL for(More)
Non-contact atomic force microscopy (AFM ) was employed following emersion to examine Au nanoclusters deposited from aqueous mixtures of HF and 10−4 M 2 onto Si(111). As the HF concentration is increased, the growth rates both parallel and perpendicular to the substrate of the approximately oblate Au hemispheroids increase. AFM images were obtained for(More)
Electroless deposition of Au onto hydrogen-terminated Si(111) from aqueous HF solutions has been studied by Rutherford backscattering (RBS) and in situ surface second harmonic (SH) generation. The SH signal as a function of time goes through a maximum which becomes stronger and occurs at shorter times as the HF concentration is increased. This can be(More)
Potassium peroxymonosulfate (Oxone) was investigated as an oxidizing agent in silica based slurries for chemical mechanical planarization of Ru. Upon addition of oxone, the Ru removal rate increases significantly in the pH range of 1–6. The slurry stability is poor at pH 3 and higher. At pH 2, oxone enhances the Ru removal rate even in the absence of(More)
A reagentless electrochemical impedance biosensor for detection of peanut protein Ara h 1, one of the allergenic proteins found in peanuts, has been demonstrated using an Au substrate onto which an antibody film has been immobilized. Following initial stabilization of the self-assembled monolayer (SAM) through which the antibody is immobilized, the(More)