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Tufa, Lemma Teshome,Oh, Sangjin,Tran, Van Tan,Kim, Jeonghyo,Jeong, Ki-Jae,Park, Tae Jung,Kim, Hwa-Jung,Lee, Jaebeom Elsevier 2018 ELECTROCHIMICA ACTA Vol.290 No.-
<P><B>Abstract</B></P> <P>A glassy carbon electrode (GCE) is modified with a nanotriplex [<I>i.e.,</I> three nanolayers consisting of graphene quantum dot (GQD)-coated Fe<SUB>3</SUB>O<SUB>4</SUB>@Ag core-shell nanostructure (Fe<SUB>3</SUB>O<SUB>4</SUB>@Ag/GQD)]. The nanotriplex is a sensitive electrochemical biosensor platform for detecting <I>Mycobacterium tuberculosis</I> antigen (culture filtrate protein; CFP-10). Gold nanoparticles (AuNPs) conjugated to an anti-CFP-10 antibody are used as a label for signal amplification. The nanotriplex-based sensing platform attains synergetic electrochemical performance by the three different roles of three nanomaterials: Fe<SUB>3</SUB>O<SUB>4</SUB> increases the surface to volume ratio; Ag enhances electrical conductivity; and GQD for loading more of the anti-CFP-10 antibody onto the electrode. The electron transfer kinetics at the surface of the electrode is simulated by means of the Butler–Volmer model. A sandwich-type immunoassay results by immobilizing the first antibody on the Fe<SUB>3</SUB>O<SUB>4</SUB>@Ag/GQD-modified GCE and by incubating this system with the antigen and then with AuNPs conjugated with the second anti-CFP-10 antibody (Ab<SUB>2</SUB>−AuNPs). The AuNPs are quantified by exposing the immunocomplex to a potential of 1.3 V for 40 s and scanning by differential pulse voltammetry. The immunosensor shows a wide linear range (0.005–500 μg/mL) with a limit of detection (signal/noise = 3) reaching 0.33 ng/mL. The results suggest that the reliable and robust performance with high selectivity and simple operation may be extended to detection of other biomarkers of pathogenic bacteria.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The nanotriplex particles (Fe<SUB>3</SUB>O<SUB>4</SUB>@Ag/GQD) were prepared with different reagents by stepwise functionalization. </LI> <LI> An electrochemical biosensor was developed for detection of a <I>Mtb</I> antigen CFP-10 using a GCE modified with a nanotriplex. </LI> <LI> The nanotriplex-based sensing platform showed synergetic electrochemical performance by means of three nanomaterials. </LI> <LI> The immunosensor showed high selectivity and a wide linear range with a LOD (S/N = 3) reaching 0.33 ng/mL. </LI> </UL> </P>
Thermobattery based on CNT Coated Carbon Textile and Thermoelectric Electrolyte
배경민,Hee Doo Yang,TUFA LEMMA TESHOME,강태준 한국정밀공학회 2015 International Journal of Precision Engineering and Vol.16 No.7
In this work, we report a thermobattery that can efficiently harvest low-grade waste heat. The thermobattery utilizes temperature dependence of ferri/ferrocyanide (Fe(CN)6 3-/Fe(CN)6 4-) redox potential and employs the porous carbon textile electrode that is coated with single-walled carbon nanotube (SWNT). Simple and scalable dipping and drying process was applied to prepare the SWNT coated textile electrodes (SWNT-CT). The SWNT coating not only decreases the sheet conductance of the textile remarkably but also provides the number of available reaction sites for thermogalvanic conversion, resulting in improving electrical outputs. The capability for power generation in the thermobattery was quantitatively investigated by measuring potential versus current curves. Discharge behavior of the thermobattery was also discussed to provide an understanding of the internal resistances that limit output electrical power.
Tran, Van Tan,Kim, Jeonghyo,Tufa, Lemma Teshome,Oh, Sangjin,Kwon, Junyoung,Lee, Jaebeom American Chemical Society 2018 ANALYTICAL CHEMISTRY - Vol.90 No.1
<P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancham/2018/ancham.2018.90.issue-1/acs.analchem.7b04255/production/images/medium/ac-2017-04255v_0009.gif'></P>