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Articles 1 - 5 of 5
Full-Text Articles in Biomedical
Microcontroller Based Ecg Amplifier, Berney Montavon
Microcontroller Based Ecg Amplifier, Berney Montavon
Undergraduate Research Posters 2012
A microprocessor that reads ECG data and detects heart arrhythmias can help keep people safe while working in high-risk environments.
Field-Effect Amperometric Immuno-Detection Of Protein Biomarker, Jiapeng Wang, Siu-Tung Yau
Field-Effect Amperometric Immuno-Detection Of Protein Biomarker, Jiapeng Wang, Siu-Tung Yau
Electrical and Computer Engineering Faculty Publications
The field-effect enzymatic detection technique has been applied to the amperometric immunoassay of the cancer biomarker, carcinoma antigen 125 (CA 125). The detection adopted a reagentless approach, in which the analyte, CA 125, was immobilized on the detecting electrode, which was modified using carbon nanotubes, and the detection signal was obtained by measuring the reduction peak current of the enzyme that was used to label the antibody. A gating voltage was applied to the detecting electrode, inducing increase in the signal current and therefore providing amplification of the detection signal. The voltage-controlled signal amplification of the detection …
A Hybrid Biofuel Cell Based On Electrooxidation Of Glucose Using Ultra-Small Silicon Nanoparticles, Yongki Choi, Gang Wang, Munir H. Nayfeh, Siu-Tung Yau
A Hybrid Biofuel Cell Based On Electrooxidation Of Glucose Using Ultra-Small Silicon Nanoparticles, Yongki Choi, Gang Wang, Munir H. Nayfeh, Siu-Tung Yau
Electrical and Computer Engineering Faculty Publications
The ultra-small silicon nanoparticle was shown to be an electrocatalyst for the electrooxidation of glucose. The oxidation appeared to be a first order reaction which involves the transfer of 1 electron. The oxidation potential showed a low onset of −0.4V vs. Ag/AgCl (−0.62V vs. RHE). The particle was used as the anode catalyst of a prototype hybrid biofuel cell, which operated on glucose and hydrogen peroxide. The output power of the hybrid cell showed a dependence on the enzymes used as the cathode catalyst. The power density was optimized to 3.7μW/cm2 when horseradish peroxidase was …
Fluorescent Si Nanoparticle-Based Electrode For Sensing Biomedical Substances, Gang Wang, Siu-Tung Yau, Kevin Mantey, Munir H. Nayfeh
Fluorescent Si Nanoparticle-Based Electrode For Sensing Biomedical Substances, Gang Wang, Siu-Tung Yau, Kevin Mantey, Munir H. Nayfeh
Electrical and Computer Engineering Faculty Publications
We have been studying the miniaturization of silicon crystals and the transition from the solid state to the atomistic state. We demonstrated the existence of “sweet spots” in cluster size in the range 1–3nm that have enhanced chemical, structural, and photo stability. The particles are produced by an electrochemical etching process as dispersion in liquid, and they are reconstituted in films, patterns, alloys, or spread on chips to produce super chips. Unlike bulk, these Si nanoparticle configurations have a spectacular ability to glow in distinct RGB colors. In this paper we describe an electrode sensor built by decorating metal or …
Preserved Enzymatic Activity Of Glucose Oxidase Immobilized On Unmodified Electrodes For Glucose Detection, Gang Wang, Ngee Mei Thai, Siu-Tung Yau
Preserved Enzymatic Activity Of Glucose Oxidase Immobilized On Unmodified Electrodes For Glucose Detection, Gang Wang, Ngee Mei Thai, Siu-Tung Yau
Electrical and Computer Engineering Faculty Publications
Glucose sensing electrodes have been realized by immobilizing glucose oxidase (GOx) on unmodified edge plane of highly oriented pyrolytic graphite (epHOPG) and the native oxide of heavily doped silicon (SiO2/Si). Both kinds of electrode show direct interfacial electron transfer due to the redox process of the immobilized GOx. The measured formal potential of the redox process agrees with that of the native enzyme, suggesting that the immobilized GOx has retained its enzymatic activity. The electron transfer rates of the GOx immobilized electrode are 2s−1 for GOx/epHOPG electrode and 7.9s−1 for GOx/SiO2/Si electrode, which …