Institute of Nano Electronic Engineering

Universiti Malaysia Perlis

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Archives for March 2017

INEE Excellence In EREKA UniMAP 2017

March 17, 2017 By Editor

Filed Under: News Tagged With: ereka, ereka 2017, ereka unimap

INEE Researchers Receive Awards From UniMAP

March 17, 2017 By Editor

Anugerah Seri Gemilang UniMAP 2017

Anugerah Seri Gemilang UniMAP 2017

Anugerah Seri Gemilang UniMAP 2017

Filed Under: News Tagged With: anugerah seri gemilang unimap, slides

Substrate-gate coupling in ZnO-FET biosensor for cardiac troponin I detection

March 17, 2017 By Editor

Abstract – Currently, field-effect transistor (FET)-based biosensors have been implemented in several portable sensors with the ultimate application in point-of-care testing (POCT). In this paper, we have designed substrate-gate coupling in FET-based biosensor for the detection of cardiac troponin I (cTnI) biomarker. In the device structure, zinc oxide nanoparticles (ZnO-NPs) thin film were deposited through sol-gel and spin coating techniques on the channel. The p-type silicon was used as a substrate, while ZnO is an n-type nanomaterial, thus creates p-n-p junction between source, channel, and drain. The deposited thin films exhibited hexagonal wurtzite phase of ZnO, suitable for biomolecular interaction as revealed in X-ray diffraction (XRD) analysis. The surface of the thin film was then functionalized with 3-aminopropyltriethoxysilane (APTES), followed by glutaraldehyde (GA) as a bi-functional linker to immobilize the cTnI monoclonal antibody (MAb-cTnI) as bio-receptor for capturing cTnI biomarker and proven by the Fourier transform-infrared (FT-IR) spectra. Lastly, we demonstrated a new strategy, the integration of FET-based biosensors with substrate-gate showed differences between before (immobilization) and after cTnI target biomarker interaction by significant changes in drain current (ID) and change of threshold voltage (VT), which improved the sensitive detection, with the limit of detection down to 3.24 pg/ml.

Keywords – Biosensor, Cardiac troponin I, Electrical-based, Field-effect transistor, Substrate-gate coupling, Zinc oxide nanoparticles

Corresponding Author: Uda Hashim
Corresponding Author’s Email: uda@unimap.edu.my

Full text: PDF

Filed Under: Publications Tagged With: Biosensor, Cardiac troponin I, Electrical-based, Field-effect transistor, Substrate-gate coupling, Zinc oxide nanoparticles

NEWS @ INEE

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Institute of Nano Electronic Engineering, Universiti Malaysia Perlis
Lot 106, 108 & 110, Blok A, Taman Pertiwi Indah,
Jalan Kangar-Alor Setar, Seriab 01000 Kangar, Perlis, Malaysia
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